Use these links to rapidly review the document
TABLE OF CONTENTS

Table of Contents

As filed with the Securities and Exchange Commission on November 20, 2017April 5, 2019

Registration No. 333-                


UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM S-3
Form S-3

REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933

Onconova Therapeutics, Inc.

(Exact name of registrant as specified in charter)

Delaware

22-3627252

Delaware
(State or other jurisdiction of
incorporation or organization)

22-3627252
(I.R.S. Employer
Identification No.)

375 Pheasant Run
Newtown, PA 18940
(267) 759-3680

(Address, including zip code, and telephone number, including area code, of registrant’sregistrant's principal
executive offices)

Ramesh Kumar, Ph.D.Steven M. Fruchtman, M.D.
President and Chief Executive Officer
Onconova Therapeutics, Inc.
375 Pheasant Run
Newtown, PA 1895418940
(267) 759-3680
(Name, address, including zip code, and telephone number including area code, of agent for service)

Copy to:
Joanne R. Soslow
Morgan, Lewis & Bockius LLP
1701 Market Street
Philadelphia, PA
(215) 963-5000

Approximate date of commencement of proposed sale to the public:
From time to time after the effective date of this registration statement.

If the only securities being registered on this formForm are being offered pursuant to dividend or interest reinvestment plans, please check the following box.    o

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box.    ýx

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, of 1933, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.    o

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, of 1933, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.    o

If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box.    o

If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box.    o

          

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company or an emerging growth company. See definitions of “large"large accelerated filer”filer", “accelerated filer”"accelerated filer", “smaller"smaller reporting company”company" and “emerging"emerging growth company”company" in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer

o

o

Accelerated filer

o

o

Non-accelerated filer

ý

o (Do not check if a smaller reporting company)

Smaller reporting company

ý

x

Emerging growth company

xo

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act.    o



Table of Contents

CALCULATION OF REGISTRATION FEE

 

 

 

 

 

 

 

 

 

 

Title of Each Class of Securities to be Registered

 

Amount to
be
Registered

 

Proposed
Maximum
Offering Price Per
Share

 

Proposed
Maximum
Aggregate
Offering
Price

 

Amount of
Registration Fee

 

Primary Offering by Onconova Therapeutics, Inc.

 

 

 

 

 

 

 

 

 

Common Stock, par value $0.01 per share

 

(1)

 

(2)

 

(2)

 

 

Preferred Stock, par value $0.01 per share

 

(1)

 

(2)

 

(2)

 

 

Debt Securities

 

(1)

 

(2)

 

(2)

 

 

Warrants

 

(1)

 

(2)

 

(2)

 

 

Units

 

(1)

 

(2)

 

(2)

 

 

Total for Primary Offering

 

(1)

 

(2)

 

$84,546,394

 

(3)

 

Secondary Offering by Selling Stockholders

 

 

 

 

 

 

 

 

 

Common Stock, par value $0.01 per share

 

100

 

$1.67(4)

 

$167

 

(3)

 

Total

 

(1)

 

(2)

 

$84,546,394

 

(3)

 

        
 
Title of Each Class of Securities
to be Registered

 Amount to be
Registered

 Proposed Maximum
Offering Price Per
Share

 Proposed Maximum
Aggregate Offering
Price

 Amount of
Registration Fee

 

Common Stock, par value $0.01 per share

 54,463(1) $3.25(2) $177,005(2) $21.46

 

(1)     This replacement registration statement is filed pursuant to Rule 415(a)(6) under the Securities Act of 1933, as amended (the “Securities Act”) and includes solely (A) up to $84,546,394 aggregate initial offering price of such indeterminate number of shares of common stock and preferred stock, such indeterminate principal amount of debt securities, such indeterminate number of warrants to purchase common stock, preferred stock or debt securities, and such indeterminate number of units (collectively, the “Primary Securities”) of Onconova Therapeutics, Inc. (the “Company”) that were previously offered by the Company and registered on the Company’s registration statement on Form S-3 (Registration No. 333-199219) (the “Prior Registration Statement”) filed by the Company with the Securities and Exchange Commission (the “Commission”) under the Securities Act on October 8, 2014 and declared effective by the Commission on November 20, 2014, and were not sold thereunder; and (B) up to 100 shares of common stock offered by certain selling stockholders under the Prior Registration Statement (the “Secondary Securities” and, together with the Primary Securities, the “Securities”).  Under Rule 415(a)(5) under the Securities Act, the registration regarding the Primary Securities under the Prior Registration Statement expires three years after the effective date of the Prior Registration Statement, or on November 20, 2017.  Accordingly, the Company is filing this registration statement to cover the Securities, which were unsold under the Prior Registration Statement.  Any Primary Securities registered hereunder may be sold separately or as units with the other Securities registered hereunder. The Primary Securities registered hereunder also include such indeterminate number of shares of common stock and preferred stock and amount of debt securities as may be issued upon conversion of or exchange for preferred stock or debt securities that provide for conversion or exchange, upon exercise of warrants or pursuant to the anti-dilution provisions of any of such Primary Securities. In addition, pursuant
Pursuant to Rule 416 under the Securities Act, the Securitiesshares of common stock, par value $0.01 per share ("Common Stock") being registered hereunder include such indeterminate number of shares of common stock and preferred stockCommon Stock as may be issuable with respect to the Securitiesshares of Common Stock being registered hereunder as a result of stock splits, stock dividends or in connection with a stock combination, recapitalization, merger, consolidation or otherwise.



(2)     The proposed maximum offering price per unit of each class of the Primary Security registered hereunder will be determined from time to time in connection with, and at the time of, the issuance of the Primary Securities and is not specified as to each class of Primary Security pursuant to General Instruction II.D. of Form S-3.

(3)     Pursuant to Rule 415(a)(6) under the Securities Act, the filing fee of (A) $9,824.29 related to the $84,546,394 aggregate offering price of the Primary Securities and (B) $0.05 related to the 100 shares of common stock as the Secondary Securities included in this replacement registration statement that were previously registered on the Prior Registration Statement, and were not sold thereunder, will continue to be applied to such unsold securities. In accordance with Rule 415(a)(6), no registration fee is due and the registration of the Securities under the Prior Registration Statement will be deemed terminated as of the date of effectiveness of this replacement registration statement.

(4)     With respect to shares of common stock to be offered by the selling stockholders in the secondary offering, the price has been estimated

Estimated solely for the purpose of calculating the registration fee, pursuant to Rule 457(c) under the Securities Act, based on the average of the high and low prices reported for the shares of common stockCommon Stock as reported on the Nasdaq Capital Market on November 17, 2017.

April 1, 2019.

          

The registrant hereby amends this registration statement on such date or dates as may be necessary to delay its effective date until the registrant shall file a further amendment that specifically states that this registration statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933 or until the registration statement shall become effective on such date as the Securities and Exchange Commission, acting pursuant to said Section 8(a), may determine.

   




Table of Contents

Explanatory Note

This replacement registration statement is filed pursuant to Rule 415(a)(6) under the Securities Act of 1933, as amended (the “Securities Act”) and includes solely (A) up to $84,546,394 aggregate initial offering price of such indeterminate number of shares of common stock and preferred stock, such indeterminate principal amount of debt securities, such indeterminate number of warrants to purchase common stock, preferred stock or debt securities, and such indeterminate number of units (collectively, the “Primary Securities”) of Onconova Therapeutics, Inc. (the “Company”) that were previously offered by the Company and registered on the Company’s registration statement on Form S-3 (Registration No. 333-199219) (the “Prior Registration Statement”) filed by the Company with the Securities and Exchange Commission (the “Commission”) under the Securities Act on October 8, 2014 and declared effective by the Commission on November 20, 2014, and were not sold thereunder; and (B) up to 100 share of common stock offered by certain selling stockholders under the Prior Registration Statement (the “Secondary Securities” and, together with the Primary Securities, the “Securities”).  Under Rule 415(a)(5) under the Securities Act, the registration regarding the Primary Securities under the Prior Registration Statement expires three years after the effective date of the Prior Registration Statement, or on November 20, 2017.  Accordingly, the Company is filing this registration statement to cover the Securities, which were unsold under the Prior Registration Statement.  Any Primary Securities registered hereunder may be sold separately or as units with the other Securities registered hereunder. The Primary Securities registered hereunder also include such indeterminate number of shares of common stock and preferred stock and amount of debt securities as may be issued upon conversion of or exchange for preferred stock or debt securities that provide for conversion or exchange, upon exercise of warrants or pursuant to the anti-dilution provisions of any of such Primary Securities. In addition, pursuant to Rule 416 under the Securities Act, the Securities being registered hereunder include such indeterminate number of shares of common stock and preferred stock as may be issuable with respect to the Securities being registered hereunder as a result of stock splits, stock dividends or in connection with a stock combination, recapitalization, merger, consolidation or otherwise.

The proposed maximum offering price per unit of each class of the Primary Security registered hereunder will be determined from time to time in connection with, and at the time of, the issuance of the Primary Securities and is not specified as to each class of Primary Security pursuant to General Instruction II.D. of Form S-3.

Under Rule 415(a)(5), the Company may continue to offer and sell the Securities during the grace period permitted by Rule 415(a)(5). In accordance with Rule 415(a)(6), effectiveness of this replacement registration statement will be deemed to terminate the offering of the Securities on the Prior Registration Statement.



Table of Contents

The information in this prospectus is not complete and may be changed. WeThe selling stockholder may not sell these securities until the registration statement filed with the Securities and Exchange Commission is effective. This prospectus is not an offer to sell these securities and itthe selling stockholder is not soliciting offers to buy these securities in any state or other jurisdiction where the offer or sale is not permitted.

SUBJECT TO COMPLETION, DATED NOVEMBER 20, 2017APRIL 5, 2019

PROSPECTUS

LOGO

Onconova Therapeutics, Inc.

54,463 Shares

Common Stock

        

$84,546,394
Common Stock, Preferred Stock,
Debt Securities, Warrants and Units
and
100 Shares of Common Stock Offered by Selling Stockholders

This prospectus covers our offer and sale from time to time of any combination of common stock, preferred stock, debt securities, warrants or units describedThe selling stockholder named in this prospectus in one or more offerings. This prospectus provides a general description ofunder the securities we may offer and sell. Each time we offer and sell securities we will provide specific terms of the securities offered in a supplement to this prospectus. The prospectus supplement will also describe the specific manner in which we will offer the securities and may also add, update or change information contained in this prospectus. The aggregate offering price of all securities sold by us under this prospectus may not exceed $84,546,394.

In addition, the selling stockholders to be named in the applicable prospectus supplementheading "Selling Stockholder" may offer and sell up to an aggregate of 10054,463 shares of our common stock, par value $0.01 per share ("Common Stock"), from time to time, in amounts, at prices and on terms that will be determined at the time the shares of our common stock are offered. The prospectus supplement may also add, update or change information contained in this prospectus.time. We will not receive any of the proceeds from the sale of shares of our common stockthe Common Stock by the selling stockholders.stockholder.

        

You should read this prospectus and any supplement carefully before you purchase any of our securities. This prospectus may not be used to offer and sell securities unless accompanied by a prospectus supplement.

The securities may be offered and sold by us or the selling stockholdersstockholder from time to time at fixed prices, at market prices or at negotiated prices, and may be offered and sold to or through one or more underwriters, dealers or agents or directly to purchasers on a continuous or delayed basis. See “Plan"Plan of Distribution."

        

Our common stockCommon Stock is currently listed on the Nasdaq Capital Market under the symbol “ONTX”."ONTX." On November 17, 2017,April 4, 2019, the last reported sale price of our common stockCommon Stock on the Nasdaq Capital Market was $1.69$3.72 per share.

        

As of November 17, 2017, the aggregate market valueYou should read this prospectus and any supplement carefully before you purchase any of our outstanding common stock held by non-affiliates, or the public float, was $22,235,842, which was calculated based on shares of our outstanding common stock held by non-affiliates and on a price of $2.68 per share, the last reported sale price for our common stock, on October 12, 2017. During the 12 calendar month period that ends on, we have offered securities with an aggregate market value of approximately $7,409,115 pursuant to General Instruction I.B.6 of Form S-3.

securities. You should rely only on the information contained or incorporated by reference in this prospectus. We have not authorized any other person to provide you with different information.

        

Investing in these securities involves risks, including those set forth in the “Risk Factors”"Risk Factors" section of the applicable prospectus supplement and any related free writing prospectus and of our most recent Annual Report on Form 10-K as revised or supplemented by our Quarterly Reports on Form 10-Q filed with the SEC since the filing of our most recent Annual Report on Form 10-K, each ofSecurities and Exchange Commission (the "SEC"), which is incorporated by reference into this prospectus.prospectus as well as any amendment or update to our risk factors reflected in subsequent filings with the SEC.

        

Neither the SEC nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful and complete. Any representation to the contrary is a criminal offense.

   

This prospectus is dated                        , 20  .2019.




Table of Contents


TABLE OF CONTENTS

i


i



Table of Contents


ABOUT THIS PROSPECTUS

        

This prospectus is part of a registration statement that we filed with the SEC. This prospectus covers the primary offering by us of up to an aggregate offering price of $84,546,394 of securities. In addition, under this prospectus, theThe selling stockholders, to bestockholder named in a prospectus supplement to this prospectus may from time to time offer and sell up to an aggregate 10054,463 shares of our common stock in one or more offerings. We may offer and sell any combination of the securities described in this prospectus and the selling stockholders may offer and sell shares of common stockCommon Stock in one or more offerings. This prospectus provides you with a general description of the securities wethat the selling stockholder may offer and sell. Each time we offer and sell securities underYou should carefully read this prospectus, we will provide a prospectus supplementtogether with the more detailed information regarding our company and our Common Stock that will contain specific information about the terms of that offering. We may also authorize one or more free writing prospectuses to be provided to you that may contain material information relating to these offerings. The prospectus supplement and any related free writing prospectus may also add, update or change information containedappear elsewhere in this prospectus or in any documents that we have incorporated by reference into this prospectus. You should read this prospectus,and any applicable prospectus supplement, and any related free writing prospectus, together with the additional information incorporated herein(including our financial statements and notes to those statements) that we incorporate in this prospectus by reference as described(which we describe under the heading “Where You Can Find More"Incorporation of Information By Reference") before investing in any of the securities offered.

        

We have filed or incorporated by reference exhibits to the registration statement of which this prospectus forms a part. You should read the exhibits carefully for provisions that may be important to you.

        

This prospectus may not be used to consummate a sale of securities unless it is accompanied by a prospectus supplement.

Neither we nor any selling stockholder has authorized any dealer, salesman or other person to give any information or to make any representation other than those contained or incorporated by reference in this prospectus and any accompanying supplement to this prospectus. You should not assume that the information in this prospectus or any prospectus accompanying supplement is accurate as of any date other than the date on the front of those documents or that any document incorporated by reference is accurate as of any date other than its filing date. You must not rely upon any information or representation not contained or incorporated by reference in this prospectus or any accompanying prospectus supplement. This prospectus and any accompanying supplement to this prospectus do not constitute an offer to sell or the solicitation of an offer to buy any securities other than the registered securities to which they relate, nor do this prospectus and any accompanying supplement to this prospectus constitute an offer to sell or the solicitation of an offer to buy securities in any jurisdiction to any person to whom it is unlawful to make such offer or solicitation in such jurisdiction.


WHERE YOU CAN FIND MORE INFORMATION

        

We file annual, quarterly and current reports, proxy statements and other information with the SEC. You may read and copy any document we file with the SEC at the SEC’s public reference room at 100 F Street NE, Room 1580, Washington, D.C. 20549. You may obtain information on the operation of the SEC’s public reference facilities by calling the SEC at 1-800-SEC-0330. You can request copies of these documents, upon payment of a duplicating fee, by writing to the SEC at its principal office at 100 F Street NE, Room 1580, Washington, D.C. 20549-1004. The SEC maintains an Internet website at http://www.sec.gov that contains reports, proxy and information statements, and other information regarding issuers that file electronically with the SEC. Our SEC filings are accessible through the Internet at that website. Our SEC reports on Forms 10-K, 10-Q and 8-K, and amendments to those reports are also available for download, free of charge, as soon as reasonably practicable after these reports are filed with the SEC, at our website at www.onconova.com. The content contained in, or that can be accessed through, our website is not a part of this prospectus.

        

Unless the context indicates otherwise, as used in this prospectus, the terms “Onconova,” “Onconova"Onconova," "Onconova Therapeutics,” “Company,” “we,” “us”" "Company," "we," "us" and “our”"our" refer to Onconova Therapeutics, Inc. and its consolidated subsidiaries.


Table of Contents


INCORPORATION OF INFORMATION BY REFERENCE

        

The SEC allows us to “incorporate"incorporate by reference”reference" the information we file with it, which means that we can disclose important information to you by referring you to those documents. The information incorporated by reference is considered to be part of this prospectus, and information that we file later with the SEC will automatically update and supersede this information. We incorporate by reference the documents listed below:

    ·Our Annual Report on Form 10-K for the fiscal year ended December 31, 20162018 that we filed with the SEC on March 29, 2017, including the information required by Part III, Items 10 through 14, of Form 10-K, which is incorporated by reference to our definitive proxy statement for our 2017 annual meeting of stockholders filed on April 12, 2017;

    1, 2019;·

                      Our Quarterly Reports on Form 10-Q for the fiscal quarters ended March 31, 2017, June 30, 2017 and September 30, 2017 that we filed with the SEC on May 15, 2017, August 14, 2017 and November 9, 2017, respectively;

    ·Our Current ReportsReport on Form 8-K filed with the SEC on April 20, 2017, April 24, 2017, May 18, 2017, May 25, 2017,  August 18, 2017, November 13, 2017 and November 17, 2017;

    January 15, 2019;·

    The description of our common stockCommon Stock contained in our registration statement on Form 8-A filed on July 23, 2013 (Registration no. 001-36020) with the SEC, including any amendment or report filed for the purpose of updating such description;

    ·

    All documents filed by us with the SEC pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934, as amended or the Exchange Act(the "Exchange Act") after the date of the initial filing of the registration statement of which this prospectus is a part and prior to the effectiveness of such registration statement; and

    ·

    All documents filed by us with the SEC pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act on or after the date of this prospectus and before we stop offering the securities under this prospectus.

        

We will provide without charge to each person, including any beneficial owner, to whom this prospectus is delivered, upon his or her written or oral request, a copy of any or all documents referred to above which have been or may be incorporated by reference into this prospectus but not delivered with this prospectus excluding exhibits to those documents unless they are specifically incorporated by reference into those documents. You can request those documents from us, at no cost, by writing or telephoning us at: Onconova Therapeutics, Inc., 375 Pheasant Run, Newtown, Pennsylvania, 18940, (267) 759-3680, Attention: Suzanne Hutchison.

        

The most recent information that we file with the SEC automatically updates and supersedes older information. The information contained in any such filing will be deemed to be a part of this prospectus, commencing on the date on which the filing is made.

        

Information furnished under Items 2.02 or 7.01 (or corresponding information furnished under Item 9.01 or included as an exhibit) in any past or future Current Report on Form 8-K that we file with the SEC, unless otherwise specified in such report, is not incorporated by reference in this prospectus.


CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

        

This prospectus and the documents incorporated by reference herein contain, and any prospectus supplement may contain, forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended or the Securities Act,(the "Securities Act"), and Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act. All statements, other than statements of historical facts, included or incorporated in this prospectus or any prospectus supplement regarding our strategy, future operations, financial position, future revenues, projected costs, prospects, plans and objectives of management are forward-looking statements. We may, in some cases, use terms such as “believes,” “estimates,” “anticipates,” “expects,” “plans,” “intends,” “may,” “could,” “might,” “will,” “should,” “approximately”"believes," "estimates," "anticipates," "expects," "plans," "intends," "may," "could," "might," "will," "should," "approximately" or other words that convey uncertainty of future events or outcomes to identify these forward-looking statements. Forward-looking statements appear in a number of places throughout this prospectus and the documents incorporated by reference herein, and include statements regarding our intentions, beliefs, projections, outlook,


Table of Contents

analyses or current expectations concerning, among other things, our ongoing and planned preclinical development and clinical trials, the timing of and our ability to make regulatory filings and obtain and maintain regulatory approvals for our product candidates, protection of our intellectual property portfolio, the degree of clinical utility of our products, particularly in specific patient populations, our ability to develop commercial and manufacturing functions, expectations regarding clinical trial data, our results of operations, cash needs, financial condition, liquidity, prospects, growth and strategies, the industry in which we operate and the trends that may affect the industry or us.

        

By their nature, forward-looking statements involve risks and uncertainties because they relate to events, competitive dynamics and industry change, and depend on the economic circumstances that may or may not occur in the future or may occur on longer or shorter timelines than anticipated. Although we believe that we have a reasonable basis for each forward-looking statement contained in this prospectus and in documents incorporated by reference herein, we caution you that forward-looking statements are not guarantees of future performance and that our actual results of operations, financial condition and liquidity, and the development of the industry in which we operate may differ materially from the forward-looking statements contained in this prospectus.

        

Actual results could differ materially and adversely from our forward-looking statements due to a number of factors, including, without limitation, risks related to:

    ·our need for additional financing for our INSPIRE trial and other operations, and our ability to obtain sufficient funds on acceptable terms when needed, and our plans and future needs to scale back operations if adequate financing is not obtained;

    ·

    our ability to continue as a going concern;

    ·

    our estimates regarding expenses, future revenues, capital requirements and needs for additional financing;

    ·

    the success and timing of our preclinical studies and clinical trials, including site initiation and patient enrollment, and regulatory approval of protocols for future clinical trials;

    ·

    our ability to enter into, maintain and perform collaboration agreements with other pharmaceutical companies, for funding and commercialization of our clinical drug product candidates or preclinical compounds, and our ability to achieve certain milestones under those agreements;

    ·

    the difficulties in obtaining and maintaining regulatory approval of our product candidates, and the labeling under any approval we may obtain;

    ·

    our plans and ability to develop, manufacture and commercialize our product candidates;

    ·

    our failure to recruit or retain key scientific or management personnel or to retain our executive officers;

    ·

    the size and growth of the potential markets for our product candidates and our ability to serve those markets;

    ·

    regulatory developments in the United States and foreign countries;

    ·

    the rate and degree of market acceptance of any of our product candidates;

    ·

    obtaining and maintaining intellectual property protection for our product candidates and our proprietary technology;

    ·

    the successful development of our commercialization capabilities, including sales and marketing capabilities;

    ·

    recently enacted and future legislation and regulation regarding the healthcare system;


·Table of Contents

    the success of competing therapies and products that are or may become available;

    ·

    our ability to maintain the listing of our Common Stocksecurities on a national securities exchange;

    ·

    the potential for third party disputes and litigation;

    and·

    the performance of third parties, including contract research organizations (“CROs”("CROs") and third-party manufacturers; and

    manufacturers.

        

·                         our expectations regarding CRO transition.

Any forward-looking statements that we make in this prospectus and the documents incorporated by reference herein speak only as of the date of such statement, and we undertake no obligation to update such statements whether as a result of any new information, future events, changed circumstances or otherwise. Comparisons of results for current and any prior periods are not intended to express any future trends or indications of future performance, unless expressed as such, and should only be viewed as historical data.

        

You should also read carefully the factors described in the “Risk Factors”"Risk Factors" section of this prospectus and in documents incorporated by reference herein, to better understand the risks and uncertainties inherent in our business and underlying any forward-looking statements. As a result of these factors, we cannot assure you that the forward-looking statements in this prospectus and in documents incorporated by reference herein will prove to be accurate. Furthermore, if our forward-looking statements prove to be inaccurate, the inaccuracy may be material. In light of the significant uncertainties in these forward-looking statements, you should not regard these statements as a representation or warranty by us or any other person that we will achieve our objectives and plans in any specified timeframe, or at all.

        

We obtained the industry, market and competitive position data in this prospectus and in documents incorporated by reference herein from our own internal estimates and research as well as from industry and general publications and research surveys and studies conducted by third parties. Industry publications and surveys generally state that the information contained therein has been obtained from sources believed to be reliable. We believe this data is accurate in all material respects as of the date of this prospectus.


RISK FACTORS

        

Our business is influenced by many factors that are difficult to predict, and that involve uncertainties that may materially affect actual operating results, cash flows and financial condition. Before making an investment decision, you should carefully consider these risks set forth in the “Risk Factors”"Risk Factors" section of our Annual Report on Form 10-K, as filed with the SEC on March 29, 2017, and our Quarterly Reports on Form 10-Q for the quarter ended September 30, 2017, as filed with the SEC on November 9, 2017,April 1, 2019 which areis incorporated by reference into this prospectus, as well as any amendment or update to our risk factors reflected in subsequent filings with the SEC and any applicable prospectus supplement or any free writing prospectus.supplement. You should also carefully consider any other information we include or incorporate by reference in this prospectus. Any such risk could cause our business, financial condition or operating results to suffer. The market price of our common stockCommon Stock could decline if one or more of these risks and uncertainties develop into actual events. You could lose all or part of your investment.


ONCONOVA THERAPEUTICS, INC.

Overview

        

Overview

We are a clinical-stage biopharmaceutical company focused on discovering and developing novel small molecule product candidates primarily to treat cancer. Using our proprietary chemistry platform, we have created a library of targeted agents designed to work against cellular pathways important to cancer cells. We believe that the product candidates in our pipeline have the potential to be efficacious in a variety of cancers. We have one Phase 3 clinical-stage product candidate and two other clinical-stageclinical-


Table of Contents

stage product candidates (one of which is being developedhas been studied for treatment of acute radiation syndromes) and severala preclinical programs.program. Substantially all of our current effort is focused on our lead product candidate, rigosertib. Rigosertib is being tested in an intravenous formulation as a single agent, and an oral formulation in combination with azacitidine, in clinical trials for patients with higher-risk myelodysplastic syndromes (“MDS”("MDS"). The Company has and may continue to delay, scale-back, or eliminate certain of its research and development activities and other aspects of its operations until such time as the Company is successful in securing additional funding.

        

In December 2015, we enrolled the first patient ininto our INSPIRE trial, a randomized controlled Phase 3 clinical trial of intravenous rigosertib “rigosertib IV”("rigosertib IV") in a population of patients with higher-risk MDS after failure of hypomethylating agent (“HMA”("HMA") therapy. The trial, which we refer to as INSPIRE, is expected to enroll approximately 225 patients at more than 170 sites globally. The primary endpoint of INSPIRE is overall survival. An interim analysis of the trial was performed in January 2018 and we anticipate completion of enrollment of the INSPIRE trial in the second half of 2019.

        

Our net lossesloss were $17.9$20.4 million and $14.2$24.1 million for the nine monthsyears ended September 30,December 31, 2018 and 2017, and 2016, respectively. As of September 30, 2017,December 31, 2018, we had an accumulated deficit of $356.1$381.9 million.

RigosertibMyelodysplastic Syndromes

        MDS is a group of blood disorders that affect bone marrow function. MDS typically affects older patients. In MDS, the bone marrow cells appear dysplastic, and their capacity to produce cells is defective. Therefore, blood cells do not develop normally, such that too few healthy blood cells are released into the blood stream, leading to low blood cell counts, or cytopenias. Thus, many patients with MDS require frequent blood transfusions. In most cases, the disease worsens and the patient develops progressive bone marrow failure. In advanced stages of the disease, immature blood cells, or blasts, leave the bone marrow and enter the blood stream, leading to acute myelogenous leukemia ("AML"), which occurs in approximately one-third of patients with MDS.

        Based on Surveillance Epidemiology and End Results (SEER) data from the National Cancer Institute, a marketing analytics firm has estimated the 2016 incidence of MDS to be approximately 17,390 cases and the prevalence of MDS to be approximately 61,690 cases in the United States. We believe that the actual incidence numbers may be higher, due to underdiagnosing and underreporting of new cases of MDS to centralized cancer registries, and that the incidence of MDS in the United States is likely to increase, due to an aging population, improved disease awareness and diagnostic precision, and an increase in the number of cases of secondary, often chemotherapy-induced, MDS.

        MDS is typically diagnosed using routine blood tests or by observing a combination of certain symptoms, such as shortness of breath, weakness, easy bruising or bleeding, or fever with frequent infections. A diagnosis of MDS is confirmed by evaluating a bone marrow biopsy/aspirate showing dysplastic changes, and, in more advanced cases, the presence of excess blasts, meaning that blasts account for more than 5% of the total number of nucleated cells in the bone marrow. Several classification systems have been developed to gauge the severity of disease and help determine prognosis and treatment strategy. Two standard classification systems can be used, the French-American-British morphological classification system as modified by the World Health Organization, or WHO, and the recently revised International Prognostic Scoring System ("IPSS-R") to estimate anticipated survival for patients with MDS based on marrow function and marrow cytogenetics. IPSS-R ranks the severity of chromosome abnormalities, severity of cytopenias, and percentage of bone marrow blasts observed at diagnosis to calculate a five-level risk score: Very Low, Low, Intermediate, High and Very High. MDS patients are generally classified using IPSS-R in order to assess the risk of dying or having their disease progress to AML.


Table of Contents

Treating Myelodysplastic Syndromes

        We believe that most higher-risk and some lower-risk MDS patients in the United States are treated with azacitidine or decitabine, the two approved HMAs for treatment of MDS. A provider of information services and technology for the healthcare industry estimates that in the year ended June 2012, approximately 12,500 MDS patients in the United States received treatment with HMAs.

        A significant number of higher-risk MDS patients fail or cannot tolerate treatment with azacitidine or decitabine, which represent the current standard of care for higher-risk MDS patients, and almost all patients who initially respond to therapy eventually progress. Median survival time of higher-risk MDS patients who have failed HMAs is less than one year. Accordingly, we believe that a new therapy that would extend survival in these patients would represent a major contribution in the treatment of MDS.

        Allogeneic peripheral blood stem cell or bone marrow transplantation is a potentially curative therapy for MDS. However, since most patients with MDS are elderly and therefore ineligible for transplantation due to the arduous nature of the procedure, this option is generally considered only for the small proportion of younger MDS patients.

        HMAs are believed to inhibit the methylation of DNA. Methylation is a biochemical process involving the addition of a methyl group to DNA and plays an important role in gene expression during cell division and differentiation. Hypomethylation may also restore normal function to genes that are critical for differentiation and proliferation. By contrast, rigosertib is designed to block multiple oncogenic pathways through a RAS mimetic mechanism and/or interfering with RAS function. Because we believe rigosertib has a mechanism of action that is different from HMAs, it may be active in patients who have failed treatment with those drugs. Furthermore, rigosertib's distinct potential mechanism of action has been shown to combine well with approved HMAs and preclinical studies testing the combination of rigosertib with azacitidine have demonstrated synergy between the two agents. Based on these studies and our current understanding of the potential mechanism of action of rigosertib, we believe that rigosertib also has the potential to be developed in combination with azacitidine for first line or second line MDS patients and for patients with AML who are not candidates for standard induction chemotherapy; or second-line AML who have failed induction chemotherapy.

        Lower-risk MDS patients are those categorized as Very Low, Low or possibly Intermediate risk by the IPSS-R scoring system, with transfusion-dependent anemia. The subset of del(5q) cytogenetic abnormality patients are generally treated with lenalidomide (Revlimid®). For all other lower-risk MDS patients, supportive care employing blood products, such as red blood cell and platelet transfusions, and erythroid stimulating agents, is the mainstay of therapy. Frequent transfusions introduce many risks, including iron overload, blood borne infections and immune-related reactions. We believe that an oral therapeutic agent that could lower or eliminate the need for transfusions over an extended period of time for the lower-risk population as a whole and would fulfill a significant unmet medical need for this patient population.

Our Product Candidates

Rigosertib

Rigosertib is a small molecule which we believe blocks cellular signaling by targeting RAS effector pathways. This is believed to be mediated by the interaction of rigosertib to the RAS-binding domain (“RBD”("RBD"), found in many RAS effector proteins, including the Raf and PI3K kinases. We believe this mechanism of action provides a new approach to block the interactions between RAS and its targets containing RBD sites. Rigosertib is currently being tested in clinical trials as a single agent, and in combination with azacitidine, in patients with MDS. We have enrolled more than 1,300 patients in rigosertib clinical trials for MDS and other conditions. We were a party to a license and development agreement with Baxalta (as defined below), which granted Baxalta certain rights to commercialize rigosertib in Europe. The Baxalta agreement was terminated on August 30, 2016, at which time the European rights reverted to us at no cost. We are party to a collaboration agreement with


Table of Contents

SymBio, which grants SymBio certain rights to commercialize rigosertib in Japan and Korea. We are party to a license agreement with Pint Pharma International SA, which grants Pint Pharma International SA certain rights to commercialize rigosertib in certain countries in Latin America. We have retained development and commercialization rights to rigosertib in the rest of the world, including in the United States and Europe, although we could consider licensing commercialization rights to other territories as we continue to seek additional funding.

        The table below summarizes our rigosertib clinical stage programs.

Disease
FormulationIndicationStageExpected TimelinesPotential Market Opportunity
(US)/Benefit
MDSIntravenousHR—following HMA failurePhase 3 Interim analysis completedPhase 3 completion of enrollment 2H 2019~5,000 patientsNo directly competing FDA approved product in the market



Oral—in combination with AZA


HR—prior to HMAs


Phase 2


—Phase 3 protocol and SPA submitted to the FDA in 2018


~18,000


No oral NCE approved since 2005









—Phase 3 trial expected in 2019 pending funding







Oral


Lower Risk


Phase 2


Determine target patient population in 2019


>10,000


Longer potential duration of treatment

RASopathies


Intravenous and oral


JMML/other RAS Pathway diseases


Preclinical


—NIH CRADA signed

—Proof of concept 2019



Rare disease


pediatric clinical trial

Rigosertib IV for higher-risk MDS

        

We are developing the IV formulation of rigosertib for the treatment of higher-risk MDS following the failure of HMA therapy. In early 2014, we announced topline survival results from our “ONTIME”"ONTIME" trial, a multi-center Phase 3 clinical trial of rigosertib IV as a single agent versus best supportive care including low dose Ara-C. The ONTIME trial did not meet its primary endpoint of an improvement in overall survival in the intent-to-treat population, although improvements in median overall survival were observed in various pre-specified and exploratory subgroups of higher-risk MDS patients. As a result, additional clinical worka new pivotal trial referred to as INSPIRE is on-going.on-going to study what we believe is a more homogenous population in higher-risk MDS.

        

During 2014 and 2015, we held meetings with the U.S. Food and Drug Administration (“FDA”("FDA"), European Medicines Agency (“EMA”("EMA"), and several European national regulatory authorities to discuss and seek guidance on a path for approval of rigosertib IV in higher-risk MDS patients whose disease had failed HMA therapy. After discussions with the FDA and EMA, we refined our patient eligibility criteria by defining what we believe to be a more homogenous higher-risk patient population. After regulatory feedback, input from key opinion leaders in the U.S. and Europe and based on learnings from the ONTIME study, we designed a new randomized controlled Phase 3 trial, referred to as INSPIRE. The INSPIRE trial is enrolling higher-risk MDS patients under 82 years of age who have progressed on, relapsed, or failed to respond to, previous treatment with HMAs within nine months or nine cycles over the course of one year after initiation of HMA therapy, and had their last dose of HMA within six months prior to enrollment in the trial. Patients are randomized to either rigosertib with best supportive care, or the physician's choice of therapy with best supportive care. The primary endpoint of this study is the sequential analysis of overall survival of all randomized patients in the intent-to-treat (“ITT”("ITT") population and the International Prognostic Scoring System- Revised (IPSS-R) Very High Risk ("VHR") subgroup. This randomized trial of approximately 225 patients is expected to be conducted at more than 170 sites globally. The first patient in the INSPIRE trial was enrolled at the MD Anderson Cancer Center in December 2015, the first patient in Europe was enrolled in March, 2016, and the first patient in Japan was enrolled in July, 2016.


Table of Contents

Enrollment for the INSPIRE Phase 3 trial for second-line higher-risk MDS patients is highly selective and required us to search extensively to identify appropriate candidates meeting thewith stringent entry criteria. Accordingly, this trialcriteria as outlined above. The INSPIRE study currently has been opened at more than 175 sites on four continents. Our partner, SymBio Pharmaceuticals, has opened more than 30 sites in Japan for the INSPIRE protocol. As of October 31, 2017, the140 trial is active at approximately 170 sites in 22 countries.countries across four continents open, including sites open in Japan by our partner, SymBio Pharmaceuticals. The selection of countries and trial sites is carefully undertaken to ensure availability of appropriate patients meeting eligibility criteria. Since these criteria are purposely designed to be narrow and selective, extensive site screening and trial site education is integral to our plan. At launch, the INSPIRE trial was expected to enroll 225 patients and the outcome is measured by overall survival and includessurvival.

        The INSPIRE trial included a pre-planned interim analysis which is triggered by 88 events (deaths)., which occurred in December 2017. The timing of interim analysis is difficult to precisely define. Based on our statistical analysis plan ("SAP") for the enrollment rate, and the expected survival in a comparable patient subgroup from the ONTIMEINSPIRE trial we expectfeatured an adaptive trial design, permitting several options following the interim analysis, to occur late in the fourth quarterwhich included continuation of 2017. The interim analysis involves an initial analysis of efficacy by an independent statistical consultant. These results will be submitted to the independent data monitoring committee (DMC). The interim analysis may result in the trial stopping due toas planned, discontinuation of the trial for futility or safety, trial expansion using pre-planned sample size re-estimation, and trial continuation for only the pre-defined treatment subgroup of patients classified as planned without any changes, or continuation with changes according toVHR based on the preset criteria for trial expansion or continued randomization only for the Very High Risk subgroup. The adaptive design element has been reviewed by regulatory agencies in the US and Europe. The actual timingIPSS-R.

        After review of the interim analysis and its outcome will permit better estimates for complete enrollment and top-line analysis. Sincedata, in January 2018 the dateIndependent Data Monitoring Committee ("DMC") recommended continuation of the interim analysis is tiedtrial with a one-time expansion in enrollment, using a pre-planned sample size re-estimation, consistent with the SAP. As recommended by the DMC, the expanded INSPIRE study will continue to enroll eligible patients based on the current trial criteria of the overall ITT population and will increase enrollment by adding 135 patients to the unpredictabilityoriginal target to reach a total expected enrollment of reaching a pre-identified360 patients, with the aim of increasing the power of the trial. The targeted number of death events required for analyzing the precise timeresults of completingthe trial was increased from 176 to 288 events. Due to the adaptive trial design and the DMC's assessment of the interim data, the INSPIRE trial will continue to analyze both the ITT and the VHR population for the primary endpoint of overall survival. The design of the trial with the expanded study enrollment will be identical to the current study design and will include the sequential analysis of the overall survival endpoint in the ITT population and if required the pre-specified VHR subgroup. The Company remains blinded to the specific interim analysis results. Following the interim analysis, which will be roughly a couple of weeks after reaching the number of events, cannot be forecast precisely, and could occur early next year.

In an attempt to optimize enrollment, we have taken proactive measuresexpanded the INSPIRE Phase 3 trial to increase enrollment including the addition of trialnew sites in threepreviously participating countries and anticipate expanding the study into new geographical regions. We continue to evaluate potential new sites and countries replacementto enhance enrollment, while adhering to the stringent entry criteria to ensure that only appropriate patients are enrolled. During March 2019, we passed 75 percent completion of the principal CROenrollment and additionwe anticipate completion of another CRO to our trial management group. Due to these changes full enrollment may take longer than initially expected. Since the interim analysis could potentially change the required number of patients to be randomized for the INSPIRE trial a better estimate of these timelines can be provided after this analysis is completed. Should enrollment not return to desired levels, full enrollment may be delayed even if the adaptive design is not required as per the statistical analysis plan.

As called for in the INSPIRE Charter, the DMC has previously conducted two periodic safety reviews, and after each review, the trial continued per plan.second half of 2019.

Safety and Tolerability of rigosertib in MDS and other hematologic malignancies

A comprehensive analysis of rigosertib IV and rigosertib oral rigosertib safety in patients with Myelodysplastic Syndromes (MDS) and Acute Myeloid Leukemia (AML) was presented in December 2016 at the American Society of Hematology (ASH) Annual Meeting. The most commonly reported treatment-emergent adverse events (TEAEs) _ in> 10% of patients with MDS/AML (n= 335) receiving rigosertib intravenous (IV) monotherapy were fatigue (33%), nausea (33%), diarrhea (27%), constipation (25%), anaemia (24%) and pyrexia (24%). The most common> Grade 3 AEs were anaemia (21%), febrile neutropenia (13%), pneumonia (12%) and thrombocytopenia (11%). The most common serious AEs were febrile neutropenia (10%), pneumonia (9%), and sepsis (7%). The most common AEs leading to discontinuation of IV rigosertib were sepsis and pneumonia (3% each).


Table of Contents

Rigosertib oral in combination with azacitidine for higher-risk MDS

        We are developing rigosertib oral for use in combination with azacitidine prior to treatment with HMA therapy for higher risk MDS. In December 2016,2018, at the American Society of Hematology (ASH) Annual Meeting and in June 2017, at the Congress of the European Hematology Association Meeting (EHA), we presented results from a Phase 1/2, multi-institutional trial of data from the initial portion of an ongoing rigosertib oral rigosertib and azacitidine combination trial in higher-risk MDS. 3355 of 40 MDS74 HR-MDS patients enrolled and treated with³ 840 mg/day oral rigosertib were evaluable for response at the time of the analysis. An Overall Response Rate (ORR) of 90% and Complete Remission (CR) rate (primary endpoint) of 34% was reported in this multi-institutional Phase 1/2 study in HMA naïve patients. HMA naïve patients are patients that had not previously received either azacitidine or decitabine). Such patients were not necessarily treatment naïve patents in that they may have received other therapies used for MDS. An ORR of 54% and CR/Partial Response (PR) of 8% in HMA failed patients was also reported.

The median age of patients was 66,69, with 73%59% being male.male and 41% being female.. The IPSS-R distribution was: 7.5% Low, 12.5% Intermediate, 37.5% High, 32.5% Very High and 10% unknown. 76% of patients responded per 2006 International Working Group (IWG) criteria. Responses were as follows:

Response per IWG 2006

 
 Overall
Evaluable
(N=55)
 No prior
HMA
(N-29-0)
 Prior
HMA
(failures)
(N=26)
 

Complete remission (CR)

  11(20%) 10(34%) 1(4%)

Marrow CR + hematologic improvement

  10(18%) 5(17%) 5(19%)

Marrow CR alone

  13(24%) 8(28%) 5(19%)

Hematologic improvement alone

  5(9%) 3(10%) 2(8%)

Stable disease

  10(18%) 3(10%) 7(27%)

Overall IWG response

  40(73%) 26(90%) 14(54%)

        

Overall
Evaluable
(N=33)

No prior
HMA
(N-20)

Prior
HMA
(N=13)

Complete remission (CR)

8 (24

)%

7 (35

)%

1 (8

)%

Marrow CR + hematologic improvement

10 (30

)%

6 (30

)%

4 (31

)%

Marrow CR alone

6 (18

)%

3 (15

)%

3 (23

)%

Hematologic improvement alone

1 (3

)%

1 (5

)%

0

Stable disease

8 (24

)%

3 (15

)%

5 (38

)%

Overall IWG response

25 (76

)%

17 (85

)%

8 (62

)%

Clinical benefit response

19 (58

)%

14 (70

)%

5 (38

)%

The median duration of response for patients with HMA naïve MDS was 812.2 months for CR, 12.3 months for marrow CR.

        The median time to initial/best response for HMA naïve patients, was 1 cycle and 4 cycles, respectively

        The median duration of response for the HMA failed patients was 10.8 months

        The median time to initial/best response for patients with HMA failure MDS, was 2 cycles and 5 cycles of treatment, respectively

Safety/Tolerability of the Combination:

Oral        Based upon safety results from a comprehensive analysis of patients receiving oral rigosertib (560 mg qAM, 280 mg qPM)in combination with azacitidine that was administered on Day 1-21 of a 28-day cycle. Azacitidine 75 mg/m 2 /day SC or IV was administered for 7 days starting on Day 8. Thepresented during ASH in 2018, the combination of rigosertib oral rigosertib(>840 mg/day) and azacitidine was well tolerated. The most common TEAEs in> 10% 30% of patients with MDS/AML (n=74) receiving rigosertib oral and azacitidine were nausea (41%hematuria (45%), constipation (43%), diarrhea (42%), fatigue (42%), dysuria (38%) , pyrexia(36%), nausea (35%), neutropenia (31%) thrombocytopenia(30%) .fatigue (39%), diarrhea (37%), constipation (37%) and dysuria (28%). The most common serious AEs were pneumonia (11%) and febrile neutropenia (7%). The most common AEs leading to discontinuation were AML (4%) and pneumonia (4%).


Table of Contents

Next steps for rigosertib oral in combination with azacitidine for higher-risk MDS

        

Following an end of Phase 2 meeting with the Food and Drug Administration (FDA) in September 2016, we began development of a Phase 3 protocol. The Phase 3 trial will be designed as a global 1:1 randomized, placebo-controlled trial of rigosertib oral rigosertib plus azacitidine compared to azacitidine plus oral placebo. Based on the results of the Phase 1/2 Study, we plan to use the full dose of azacitidine will be used in combination with rigosertib oral, as defined in the product insert.insert for azacitidine. The patient population studied in this trial will be first-line (HMA naïve) higher-risk MDS patients. The primary endpoint for assessment of efficacy will be the composite Response Rate of complete remission (CR) + partial remission (PR,) as per the IWG 2006 Response Criteria. Formal FDA reviewThe trial will be sought viaunder the Special Protocol Assessment (SPA) mechanism.review of a DMC. We will not commence the Phase 3 trial without additional financing.

        

While the Phase 3 trial is being designed, we have expanded the Phase 1/2 trial cohort by up to 40 evaluable subjects. Under a protocol expansion, we plan to use the expanded cohorts to exploreexplored dose optimization by increasing the dose of rigosertib oral to a total of 1120 mg in combination with full dose azacitidine and varying the dose administration scheme of rigosertib oral to identify an optimal dose and schedule. After amendments were filed with the regulatory agencies, we started the expansion phase of this trial in the U.S. sites that participated in the initial trial. Since the trial initiation, we have added additional US sites to complete enrollment of the expanded trial. The first patient was enrolled in April 2017 and since then, more than half of the planned patients have been enrolled in the expansion trial. We plantrial; and the trial is currently closed to add more sites in the U.S. to complete enrollment of the expanded trial.new accrual and is continuing.

        

In June 2017, at the Congress of the European Hematology Association Meeting, we updated the data from the Phase 1/2 trial and highlighted results in AML patients included in this study. Response data was presented on eight evaluable patients with AML who were tested with the rigosertib and azacitidine combination. For the eight evaluable patients with AML, the combination was well tolerated and the safety profile was similar to single-agent azacitidine, based on safety information in the azacitidine FDA approved label. Based on the presented results of the combination studies, the authors concluded that continued study in AML was warranted. We will not commence further development of rigosertib oral in combination with azacitidine for AML without additional financing.

Rigosertib oral for lower-risk MDS

        

We have studied rigosertib oral as a single agent treatment for lower risk MDS. Higher-risk MDS patients suffer from a shortfall in normal circulating blood cells, or cytopenias, as well as elevated levels of cancer cells, or blasts in their bone marrow and sometimes in their peripheral blood.blood with a significant rate of transformation to acute leukemia. Lower-risk MDS patients suffer mainly from cytopenias, that is low levels of red blood cells, white blood cells or platelets. Thus, lower-risk MDS patients depend on transfusions and growth factors or other therapies to improve their low blood counts.counts; but have a lower rate of acute leukemic transformation.

        

We have explored single agent rigosertib oral as a treatment for lower-risk MDS in two Phase 2 clinical trials, 09-05 and 09-07. In December 2013,2017, we presented data at the Annual ASH Meeting from the 09-05 Phase 2 trial. This data demonstrated a 44% rate of achieving transfusion independence in the cohort of Lower -risk MDS patients treated with rigosertib oral at a dose of 560 mg BID (1120 mg over 24 hrs) two out of three weeks. To date, Phase 2 clinical data has indicated that further study of single agent rigosertib oral rigosertib in transfusion-dependent, lower-risk MDS patients is warranted. Rigosertib has been generally well tolerated, except for urinary side effects at higher dose levels. Future clinical trials will be needed to evaluate dosing and schedule modifications and their impact on efficacy and safety results of rigosertib oral rigosertib in lower-risk MDS patients.

        

Data presented from the 09-05 trial also suggested the potential of a genomic methylation assessment of bone marrow cells to prospectively identify lower-risk MDS patients likely to respond to oral rigosertib.rigosertib oral. We therefore expanded the 09-05 trial by adding an additional cohort of 20 patients to


Table of Contents

advance the development of this genomic methylation test. To date, a biomarker which would predict response has not been identified. Further testing and development of rigosertib oral rigosertib for lower-risk MDS will be required. We will not commence further development of rigosertib oral for lower-risk MDS without additional financing.

Safety and Tolerability of rigosertib oral in MDS and other hematologic malignancies

        

Oral rigosertibRigosertib oral as a monotherapy was evaluated in four4 Onconova Phase 1 and 2 studies in MDS and other hematologic malignancies. One study is completed and a clinical study report is available. The most common TEAEs in > 10%In studies of patients were pollakiuria (increased urinary frequency) (35%), fatigue (32%), diarrhea (26%), dysuria (29%) and haematuria (24%). The most common > Grade 3 AEs were anaemia (17%), thrombocytopenia (5%), haematuria (4%) and urinary tract infection (4%). The most common serious AE was pneumonia (6%). The most common AEs leading to discontinuation of patients receiving oral rigosertib as monotherapy for the treatment of MDS and other hematologic malignancies:

    Drug-related TEAEs that were³ Grade 3 in severity occurred in 21% of patients. The most frequently reported(³ 2% of patients) drug-related TEAEs that were³ Grade 3 were neutropenia (7%); thrombocytopenia and cystitis (3% each); and leukopenia, dysuria, (8%),and hematuria (2% each).

    Among the 8% of patients with SAEs that were considered drug related, the events were mostly urinary tract pain (7%), haematuria (5%) and urinary frequency (5%related. The most frequent drug-related SAE was cystitis (3%).

        

In addition to the above described clinical trials, we are continuing the preclinical and chemistry, manufacturing, and control work for IV and oral rigosertib.rigosertib oral.

Rare Disease Program in "RASopathies"

        Based on new mechanism of action data published last year, we have initiated a collaborative development program focusing on a group of rare diseases with a well-defined molecular basis in expression or defects involving the Ras Effector Pathways. Since "RASopathies" are rare diseases affecting young children, we are embarking on a multifaceted collaborative program involving patient advocacy, government and academic organizations. The RASopathies are a group of rare diseases which share a well-defined molecular basis in expression or defects involving Ras Effector Pathways. They are usually caused by germline mutations in genes that alter the RAS subfamily and mitogen-activated protein kinases that control signal transduction, and are among the most common genetic syndromes. Together, this group of diseases can impact more than 1 in 1000 individuals, according to RASopathiesNet.

        In January 2018, we entered into a Cooperative Research and Development Agreement (CRADA) with the National Cancer Institute (NCI), part of the National Institutes of Health (NIH). Under the terms of the CRADA, the NCI will conduct research, including preclinical laboratory studies and a clinical trial, on rigosertib in pediatric cancer associated RASopathies.

        As part of the CRADA, we will provide rigosertib supplies and initial funding towards non-clinical studies. The NCI will fund the majority of the research, including the cost of the clinical trial, which is expected to start in 2019. The NCI is carrying out PK/PD and dose escalation studies in preclinical models in preparation for dosing pediatric patients with single agent rigosertib. A clinical trial Phase 1 pediatric protocol has been developed and will be reviewed by the Institutional Review Board of the NCI. Based on NCI guidance, we now expect the first patient to be treated in the first half of 2019.

        In addition, pre-clinical studies are being conducted at the University of California San Francisco and funded through the Leukemia Lymphoma Society. While the NCI will conduct a trial for RASopathy related cancers in pediatric patients, we will focus on Juvenile Myelomonocytic Leukemia (JMML), a well-described RASopathy affecting children which is incurable without an allogenic hematopoietic stem cell transplant.


Table of Contents

Other Programs

        

The vast majority of the Company’sCompany's efforts are now devoted to the advanced stage development of rigosertib for unmet medical needs of MDS patients. Other programs are either paused, inactive or require only minimal internal resources and efforts. Based on the mechanism of action of rigosertib, we are exploring studying rigosertib as a single agent or in combination with an existing approved therapy, possibly an immuno-oncology agent, in solid tumors where Ras mutations are frequently found, such as lung cancer or melanoma.

    Briciclib

        

Briciclib

Briciclib, another of our product candidates, is a small molecule targeting an important intracellular regulatory protein, Cyclin D1, which is often found at elevated levels in cancer cells. Cyclin D1 expression is regulated through a process termed cap-dependent translation, which requires the function of eukaryotic initiation factor 4E protein. In vitro evidence indicates briciclib binds to eukaryotic initiation factor 4E protein, blocking cap-dependent translation of Cyclin D1 and other cancer proteins, such as c-MYC, leading to tumor cell death. We have been conducting a Phase 1 multi-site dose-escalation trial of briciclib in patients with advanced solid tumors refractory to current therapies. Safety and efficacy assessments are complete in six of the seven dose-escalation cohorts of patients in this trial. As of December 2015, the Investigational New Drug (“IND”("IND") for briciclib is on full clinical hold following a drug product lot testing failure. We will be required to undertake appropriate remedial actions prior to re-initiating the clinical trial and completing the final dose-escalation cohort.

    Recilisib

        

Recilisib is a product candidate being developed in collaboration with the U.S. Department of Defense for acute radiation syndromes. We have completed four Phase 1 trials to evaluate the safety and pharmacokinetics of recilisib in healthy human adult subjects using both subcutaneous and oral formulations. We have also conducted animal studies and clinical trials of recilisib under the FDA’sFDA's Animal Rule, which permits marketing approval for new medical countermeasures for which conventional human efficacy studies are not feasible or ethical, by relying on evidence from adequate and well-controlled studies in appropriate animal models to support efficacy in humans when the results of those studies establish that the drug is reasonably likely to produce a human clinical benefit. Human safety data, however, is still required. Ongoing studies of recilisib, focusing on animal models and biomarker development to assess the efficacy of recilisib are being conducted by third parties with government funding. We anticipate that any future development of recilisib beyond these ongoing studies would be conducted solely with government funding or by collaboration. Use of government funds to finance the research and development in whole or in part means any future effort to commercialize recilisib will be subject to federal laws and regulations on U.S. government rights in intellectual property. Additionally, we are subject to laws and regulations governing any research contracts, grants, or cooperative agreements under which government funding was provided.

    Preclinical Product Candidates

        

In addition to our three clinical-stage product candidates, we have several product candidates that target kinases, cellular metabolism or cell division in preclinical development. We may explore additional collaborations to further the development of these product candidates as we focus internally on our more advanced programs.

        

Positive preclinical data was announced at the American Association for Cancer Research (AACR) annual meeting, which took place April 1-5, 2017 in Washington, DC, for ON 123300, a first-in-class dual inhibitor of CDK4/6 + ARK5, and for ON 150030, a novel Type 1 inhibitor of FLT3 and Src


Table of Contents

pathways. We believe our CDK inhibitor is differentiated from other agents in the market (Palbociclib, Ribociclib and Abemaciclig)Abemaciclib) or in development (such as the compounds being developed by G1 Therapeutics) by its dual inhibition of CDK4/6 + ARK5. We are party to a license and collaboration agreement with HanX Biopharmaceuticals, Inc. ("HanX"), which grants HanX certain rights to commercialize ON 123300 in China. We continue to carry out research to enhance the pre-clinical data package for this compound in an attempt to seek additional partners outside of China for co-development of this novel compound.

        

In a preclinical Rb+ve xenograft model for breast cancer, ON 123300 activity was shown to be similar to Palbociclib (Pfizer’s(Pfizer's Ibrance®). Moreover, based on the same preclinical model, the new moleculeON 123300 may have the potential advantage of reduced neutropenia when compared to Palbociclib. Whereas both compounds resulted in decreased RBC and platelet counts in this preclinical model system, Palbociclib was found to have a more prominent and statistically significant (P< 0.05) inhibitory effect on neutrophil counts when compared to ON 123300.

        We have initiated IND directed activities, with our partner HanX, which includes manufacturing of API and Clinical Trial Material (CTM) under cGMP; and the GLP toxicological studies. We anticipate filing an IND with the US FDA by the end of H1 of 2019.


CORPORATE INFORMATION

        

We were incorporated in Delaware in December 1998 and commenced operations in January 1999. Our principal executive offices are located at 375 Pheasant Run, Newtown, Pennsylvania 18940, and our telephone number is (267) 759-3680. Our website address is www.onconova.com. The information on, or that can be accessed through, our website is not part of this prospectus.


USE OF PROCEEDS

        

Unless otherwise indicated in a prospectus supplement, we anticipate that the net proceeds from our sale of any securities will be used to fund the development of our clinical and preclinical programs, for other research and development activities and for general corporate purposes, which may include capital expenditures and funding our working capital needs. We expect from time to time to evaluate the acquisition of businesses, products and technologies for which a portion of the net proceeds may be used, although we currently are not planning or negotiating any such transactions. Pending such uses, we may invest the net proceeds in investment grade interest-bearing securities.

The amounts actually expended for each purpose may vary significantly depending upon numerous factors, including the amount and timing of the proceeds from this offering and progress with our clinical development programs. Expenditures will also depend upon the establishment of collaborative arrangements with other companies, the availability of additional financing and other factors. Investors will be relying on the judgment of our management regarding the application of the proceeds of any sale of securities.

In the case of sales by selling stockholders, we will not receive any ofproceeds from the proceedssale of such sales.

DESCRIPTION OF SECURITIES

We may offer shares of our common stock and preferred stock, various series of debt securities, warrants or units to purchase any of such securities, with a total value of up to $84,546,394, from time to time in one or more offerings under this prospectus at prices and on terms to be determinedCommon Stock by market conditions at the time of the offering. This prospectus provides you with a general description of the securities that we may offer. In connection with each offering, we will provide a prospectus supplement that will describe the specific amounts, prices and terms of the securities being offered, including, to the extent applicable:

·                  designation or classification;

·                  aggregate offering price;

·                  rates and times of payment of dividends;

·  ��               redemption, conversion or exchange terms;

·                  conversion or exchange prices or rates and any provisions for changes to or adjustments in the conversion or exchange prices or rates and in the securities or other property receivable upon conversion or exchange;

·                  restrictive covenants;

·                  voting or other rights; and

·                  important federal income tax considerations.

The prospectus supplement also may add, update or change information contained in this prospectus or in documents we have incorporated by reference. However, no prospectus supplement will offer a security that is not included in the Registration Statement at the time of its effectiveness or offer a security of a type that is not describedselling stockholder named in this prospectus.


This prospectus may not be used to consummate a sale of securities unless it is accompanied by a prospectus supplement.

DESCRIPTION OF CAPITAL STOCK

        

Our authorized capital stock consists of 75,000,000250,000,000 shares of common stock, par value $0.01 per share,Common Stock and 5,000,000 shares of preferred stock, par value $0.01 per share. As of November 17, 2017, 10,771,163April 3, 2019, 5,895,004 shares of our common stock,Common Stock, and no shares of our preferred stock, were outstanding.

Common Stock

        

Subject to the preferences that may be applicable to any outstanding preferred stock, holders of our common stockCommon Stock are entitled to receive ratably any dividends that may be declared by our board of directors out of funds legally available for that purpose. Holders of our common stockCommon Stock are entitled to one vote for each share on all matters voted on by stockholders, including the election of directors. Holders of our common stockCommon Stock do not have any conversion, redemption, sinking fund or preemptive rights. In the event of our dissolution, liquidation or winding up, holders of our common stockCommon Stock are entitled to share ratably in any assets remaining after the satisfaction in full of the prior rights of creditors and the aggregate liquidation preference of any preferred stock then outstanding. The rights, preferences and privileges of the holders of our common stockCommon Stock are subject to, and may be adversely affected by, the rights of the holders of shares of any series of preferred stock that we may designate and issue in the future. All outstanding shares of our common stockCommon Stock are, and any shares of common stockCommon Stock that we may issue in the future will be, fully paid and non-assessable.


Table of Contents

Preferred Stock

        

We may issue any class of preferred stock in any series. Our board of directors has the authority, subject to limitations prescribed under Delaware law, to issue preferred stock in one or more series, to establish from time to time the number of shares to be included in each series and to fix the designation, powers, preferences and rights of the shares of each series and any of its qualifications, limitations and restrictions. Our board of directors can also increase or decrease the number of shares of any series, but not below the number of shares of that series then outstanding. Our board of directors may authorize the issuance of preferred stock with voting or conversion rights that could adversely affect the voting power or other rights of the holders of the common stock.Common Stock. The issuance of preferred stock, while providing flexibility in connection with possible acquisitions and other corporate purposes, could, among other things, have the effect of delaying, deferring or preventing a change in control of our company and may adversely affect the market price of our common stockCommon Stock and the voting and other rights of the holders of commonCommon Stock.

Series A Convertible Preferred Stock

    General

        Our board of directors is authorized to issue up to 5,000,000 shares of preferred stock in one or more series without shareholder approval. Our board of directors may determine the designations, powers, preferences and the relative, participating, optional or other special rights, and any qualification, limitations and restrictions, of each series of preferred stock. Our Board of Directors has designated 1,044,488 shares of preferred stock as Series A Convertible Preferred Stock, which we refer to herein as the Series A Preferred Stock. As of April 3, 2019, there were no shares of Series A Preferred Stock outstanding.

    Rank

        The Series A Preferred Stock ranks (1) on parity with Common Stock on an "as converted" basis, (2) senior to any series of our capital stock hereafter created specifically ranking by its terms junior to the Series A Preferred Stock, (3) on parity with any series of our capital stock hereafter created specifically ranking by its terms on parity with the Series A Preferred Stock, and (4) junior to any series of our capital stock hereafter created specifically ranking by its terms senior to the Series A Preferred Stock in each case, as to dividends or distributions of assets upon our liquidation, dissolution or winding up whether voluntary or involuntary.

    Conversion

        Each 1.5 share of the Series A Preferred Stock is convertible into one (1) share of Common Stock, provided that the holder will be prohibited from converting Series A Preferred Stock into shares of Common Stock if, as a result of such conversion, the holder would own more than 4.99% of the number of shares of Common Stock outstanding immediately after giving effect to the issuance of the shares of Common Stock issuable upon conversion of the Series A Preferred Stock, or, at the election of a holder, together with its affiliates, would own more than 9.99% of the number of shares of Common Stock outstanding immediately after giving effect to the issuance of the shares of Common Stock issuable upon conversion of the Series A Preferred Stock. The conversion rate of the Series A Preferred Stock is subject to proportionate adjustments for stock splits, reverse stock splits and similar events, but is not subject to adjustment based on price anti-dilution provisions.

    Dividends

        In addition to stock dividends or distributions for which proportionate adjustments will be made, holders of Series A Preferred Stock are entitled to receive dividends on shares of Series A Preferred


Table of Contents

Stock equal, on an as-if-converted-to-common-stock basis, to and in the same form as dividends actually paid on shares of the Common Stock when, as and if such dividends are paid on shares of the Common Stock. No other dividends are payable on shares of Series A Preferred Stock.

    Voting Rights

        Except as provided in the Certificate of Designation or as otherwise required by law, the holders of Series A Preferred Stock will have no voting rights. However, we may not, without the consent of holders of a majority of the outstanding shares of Series A Preferred Stock, alter or change adversely the powers, preferences or rights given to the Series A Preferred Stock, increase the number of authorized shares of Series A Preferred Stock, or enter into any agreement with respect to the foregoing.

    Liquidation Rights

        Upon any liquidation, dissolution or winding-up of the Company, whether voluntary or involuntary, the holders of Series A Preferred Stock are entitled to receive, pari passu with the holders of Common Stock, out of the assets available for distribution to stockholders an amount equal to such amount per share as would have been payable had all shares of Series A Preferred Stock been converted into Common Stock immediately before such liquidation, dissolution or winding up, without giving effect to any limitation on conversion as a result of the Series A Beneficial Ownership Limitation, as described below.

    Series A Beneficial Ownership Limitation

        We may not effect any conversion of the Series A Preferred Stock, and a holder does not have the right to convert any portion of the Series A Preferred Stock to the extent that, after giving effect to the conversion set forth in a notice of conversion such holder would beneficially own in excess of the Series A Beneficial Ownership Limitation, or such holder, together with such holder's affiliates, and any persons acting as a group together with such holder or affiliates, would beneficially own in excess of the Series A Beneficial Ownership Limitation. The "Series A Beneficial Ownership Limitation" is 4.99% of the number of shares of the Common Stock outstanding immediately after giving effect to the issuance of shares of Common Stock issuable upon conversion of Series A Preferred Stock held by the applicable holder. A holder may, with 61 days prior notice to us, elect to increase or decrease the Series A Beneficial Ownership Limitation; provided, however, that in no event may either the holder Series A Beneficial Ownership Limitation or the affiliate Series A Beneficial Ownership Limitation be 9.99% or greater.

    Exchange Listing

        Our Series A Preferred Stock is not listed on the Nasdaq Capital Market, any national securities exchange or other nationally recognized trading system. Our Common Stock issuable upon conversion of the Series A Preferred Stock is listed on the Nasdaq Capital Market.

    Failure to Deliver Series A Conversion Shares.

        If we fail to timely deliver shares of Common Stock upon conversion of the Series A Preferred Stock (the "Series A Conversion Shares") within the time period specified in the Certificate of Designation (within three trading days after delivery of the notice of conversion, or any shorter standard settlement period in effect with respect to trading market on the date notice is delivered), and if the holder has not exercised its Series A Buy-In (defined below) rights as described below with respect to such shares, then we are obligated to pay to the holder, as liquidated damages, an amount equal to $50 per trading day (increasing to $100 per trading day after the third trading day and $200 per trading day after the tenth trading day) for each $5,000 of Series A Conversion Shares for which the Series A Preferred Stock converted which are not timely delivered. If we make such liquidated damages payments, we are not also obligated to make Series A Buy-In payments with respect to the same Series A Conversion Shares.


Table of Contents

    Compensation for Series A Buy-In on Failure to Timely Deliver Shares

        If we fail to timely deliver the Series A Conversion Shares to the holder, and if after the required delivery date the holder is required by its broker to purchase (in an open market transaction or otherwise) or the holder or its brokerage firm otherwise purchases, shares of Common Stock to deliver in satisfaction of a sale by the holder of the Series A Conversion Shares which the holder anticipated receiving upon such conversion or exercise (a "Series A Buy-In"), then we are obligated to (A) pay in cash to the holder the amount, if any, by which (x) the holder's total purchase price (including brokerage commissions, if any) for the shares of Common Stock so purchased, minus any amounts paid to the holder by us as liquidated damages for late delivery of such shares, exceeds (y) the amount obtained by multiplying (1) the number of Series A Conversion Shares that we were required to deliver times (2) the price at which the sell order giving rise to such purchase obligation was executed, and (B) at the option of the holder, either reinstate the portion of the Series A Preferred Stock and equivalent number of Series A Conversion Shares for which such conversion was not honored (in which case such conversion shall be deemed rescinded) or deliver to the holder the number of shares of Common Stock that would have been issued had we timely complied with its conversion and delivery obligations.

    Subsequent Rights Offerings; Pro Rata Distributions

        If we grant, issue or sell any Common Stock equivalents pro rata to the record holders of any class of shares of Common Stock (the "Purchase Rights"), then a holder of Series A Preferred Stock will be entitled to acquire, upon the terms applicable to such Purchase Rights, the aggregate Purchase Rights which the holder could have acquired if the holder had held the number of shares of Common Stock acquirable upon conversion of the Series A Preferred Stock (without regard to any limitations on conversion). If we declare or make any dividend or other distribution of its assets (or rights to acquire its assets) to holders of Common Stock, then a holder of Series A Preferred Stock is entitled to participate in such distribution to the same extent as if the holder had held the number of shares of Common Stock acquirable upon complete conversion of the Series A Preferred Stock (without regard to any limitations on conversion).

    Fundamental Transaction

        If, at any time while the Series A Preferred Stock is outstanding, (i) the Company, directly or indirectly, in one or more related transactions effects any merger or consolidation of the Company with or into another person, (ii) the Company, directly or indirectly, effects any sale, lease, license, assignment, transfer, conveyance or other disposition of all or substantially all of its assets in one or a series of related transactions, (iii) any, direct or indirect, purchase offer, tender offer or exchange offer (whether by the Company or another person) is completed pursuant to which holders of Common Stock are permitted to sell, tender or exchange their shares for other securities, cash or property and has been accepted by the holders of 50% or more of the outstanding Common Stock, (iv) the Company, directly or indirectly, in one or more related transactions effects any reclassification, reorganization or recapitalization of the Common Stock or any compulsory share exchange pursuant to which the Common Stock is effectively converted into or exchanged for other securities, cash or property, or (v) the Company, directly or indirectly, in one or more related transactions consummates a stock or share purchase agreement or other business combination (including, without limitation, a reorganization, recapitalization, spin-off or scheme of arrangement) with another person whereby such other person acquires more than 50% of the outstanding shares of Common Stock (not including any shares of Common Stock held by the other person or other persons making or party to, or associated or affiliated with the other persons making or party to, such stock or share purchase agreement or other business combination) (each a "Series A Preferred Stock Fundamental Transaction"), then the Series A Preferred Stock automatically converts and the holder will receive, for each Conversion Share


Table of Contents

that would have been issuable upon such conversion immediately prior to the occurrence of such Series A Preferred Stock Fundamental Transaction (without regard to the Series A Beneficial Ownership Limitation), the number of shares of Common Stock of the successor or acquiring corporation or of the Company, if it is the surviving corporation, and any additional consideration (the "Series A Preferred Stock Alternate Consideration") receivable as a result of such Series A Preferred Stock Fundamental Transaction by a holder of the number of shares of Common Stock for which the Series A Preferred Stock is convertible immediately prior to such Series A Preferred Stock Fundamental Transaction (without regard to the Series A Beneficial Ownership Limitation). For purposes of any such conversion, the determination of the conversion ratio will be appropriately adjusted to apply to such Series A Preferred Stock Alternate Consideration based on the amount of Alternate Consideration issuable in respect of one share of Common Stock in such Series A Preferred Stock Fundamental Transaction. If holders of Common Stock are given any choice as to the securities, cash or property to be received in a Series A Preferred Stock Fundamental Transaction, then the holder will be given the same choice as to the Series A Preferred Stock Alternate Consideration it receives upon automatic conversion of the Series A Preferred Stock following such Fundamental Transaction.

Series B Convertible Preferred Stock

    General

        Our board of directors is authorized to issue up to 5,000,000 shares of preferred stock in one or more series without shareholder approval. Our Board of Directors may determine the designations, powers, preferences and the relative, participating, optional or other special rights, and any qualification, limitations and restrictions, of each series of preferred stock. Our board of directors has designated 1,796,875 shares of preferred stock as Series B Convertible Preferred Stock, which we refer to herein as the Series B Preferred Stock. As of April 3, 2019, there were no shares of Series B Preferred Stock outstanding.

    Rank

        The Series B Preferred Stock ranks (1) on parity with Common Stock on an "as converted" basis, (2) senior to any series of our capital stock hereafter created specifically ranking by its terms junior to the Series B Preferred Stock, (3) on parity with Series A Preferred Stock and any series of our capital stock hereafter created specifically ranking by its terms on parity with the Series B Preferred Stock, and (4) junior to any series of our capital stock hereafter created specifically ranking by its terms senior to the Series B Preferred Stock in each case, as to dividends or distributions of assets upon our liquidation, dissolution or winding up whether voluntary or involuntary.

    Conversion

        Each 0.375 share of the Series B Preferred Stock is convertible into one (1) share of Common Stock, provided that the holder will be prohibited from converting Series B Preferred Stock into shares of Common Stock if, as a result of such conversion, the holder would own more than 4.99% of the number of shares of Common Stock outstanding immediately after giving effect to the issuance of the shares of Common Stock issuable upon conversion of the Series B Preferred Stock, or, at the election of a holder, together with its affiliates, would own more than 9.99% of the number of shares of Common Stock outstanding immediately after giving effect to the issuance of the shares of Common Stock issuable upon conversion of the Series B Preferred Stock. The conversion rate of the Series B Preferred Stock is subject to proportionate adjustments for stock splits, reverse stock splits and similar events, but is not subject to adjustment based on price anti-dilution provisions. In the event our stockholders do not approve the Charter Amendment, the Series B Preferred Stock will not be convertible into Common Stock and the value of Series B Preferred Stock may be negatively affected.


Table of Contents

    Dividends

        In addition to stock dividends or distributions for which proportionate adjustments will be made, holders of Series B Preferred Stock are entitled to receive dividends on shares of Series B Preferred Stock equal, on an as-if-converted-to-common-stock basis, to and in the same form as dividends actually paid on shares of the Common Stock when, as and if such dividends are paid on shares of the Common Stock. No other dividends are payable on shares of Series B Preferred Stock.

    Voting Rights

        Except as provided in the Certificate of Designation or as otherwise required by law, the holders of Series B Preferred Stock will have no voting rights. However, we may not, without the consent of holders of a majority of the outstanding shares of Series B Preferred Stock, alter or change adversely the powers, preferences or rights given to the Series B Preferred Stock, increase the number of authorized shares of Series B Preferred Stock, or enter into any agreement with respect to the foregoing.

    Liquidation Rights

        Upon any liquidation, dissolution or winding-up of the Company, whether voluntary or involuntary, the holders of Series B Preferred Stock are entitled to receive, pari passu with the holders of Common Stock, out of the assets available for distribution to stockholders an amount equal to such amount per share as would have been payable had all shares of Series B Preferred Stock been converted into Common Stock immediately before such liquidation, dissolution or winding up, without giving effect to any limitation on conversion as a result of the Series B Beneficial Ownership Limitation, as described below.

    Series B Beneficial Ownership Limitation

        We may not effect any conversion of the Series B Preferred Stock, and a holder does not have the right to convert any portion of the Series B Preferred Stock to the extent that, after giving effect to the conversion set forth in a notice of conversion such holder would beneficially own in excess of the Series B Beneficial Ownership Limitation, or such holder, together with such holder's affiliates, and any persons acting as a group together with such holder or affiliates, would beneficially own in excess of the Series B Beneficial Ownership Limitation. The "Series B Beneficial Ownership Limitation" is 4.99% of the number of shares of the Common Stock outstanding immediately after giving effect to the issuance of shares of Common Stock issuable upon conversion of Series B Preferred Stock held by the applicable holder. A holder may, with 61 days prior notice to us, elect to increase or decrease the Series B Beneficial Ownership Limitation; provided, however, that in no event may either the holder Series B Beneficial Ownership Limitation or the affiliate Series B Beneficial Ownership Limitation be 9.99% or greater.

    Exchange Listing

        We do not plan on making an application to list the shares of Series B Preferred Stock on the Nasdaq Capital Market, any national securities exchange or other nationally recognized trading system. Our Common Stock issuable upon conversion of the Series B Preferred Stock is listed on the Nasdaq Capital Market.

    Failure to Deliver Conversion Shares.

        If we fail to timely deliver shares of Common Stock upon conversion of the Series B Preferred Stock (the "Series B Conversion Shares") within the time period specified in the Certificate of Designation (within three trading days after delivery of the notice of conversion, or any shorter


Table of Contents

standard settlement period in effect with respect to trading market on the date notice is delivered), and if the holder has not exercised its Series B Buy-In (as defined below) rights as described below with respect to such shares, then we are obligated to pay to the holder, as liquidated damages, an amount equal to $50 per trading day (increasing to $100 per trading day after the third trading day and $200 per trading day after the tenth trading day) for each $5,000 of Series B Conversion Shares for which the Series B Preferred Stock converted which are not timely delivered. If we make such liquidated damages payments, we are not also obligated to make Series B Buy-In payments with respect to the same Series B Conversion Shares.

    Compensation for Series B Buy-In on Failure to Timely Deliver Shares

        If we fail to timely deliver the Series B Conversion Shares to the holder, and if after the required delivery date the holder is required by its broker to purchase (in an open market transaction or otherwise) or the holder or its brokerage firm otherwise purchases, shares of Common Stock to deliver in satisfaction of a sale by the holder of the Series B Conversion Shares which the holder anticipated receiving upon such conversion or exercise (a "Series B Buy-In"), then we are obligated to (A) pay in cash to the holder the amount, if any, by which (x) the holder's total purchase price (including brokerage commissions, if any) for the shares of Common Stock so purchased, minus any amounts paid to the holder by us as liquidated damages for late delivery of such shares, exceeds (y) the amount obtained by multiplying (1) the number of Series B Conversion Shares that we were required to deliver times (2) the price at which the sell order giving rise to such purchase obligation was executed, and (B) at the option of the holder, either reinstate the portion of the Series B Preferred Stock and equivalent number of Series B Conversion Shares for which such conversion was not honored (in which case such conversion shall be deemed rescinded) or deliver to the holder the number of shares of Common Stock that would have been issued had we timely complied with its conversion and delivery obligations.

    Subsequent Rights Offerings; Pro Rata Distributions

        If we grant, issue or sell any Common Stock equivalents pro rata to the record holders of any class of shares of Common Stock (the "Purchase Rights"), then a holder of Series B Preferred Stock will be entitled to acquire, upon the terms applicable to such Purchase Rights, the aggregate Purchase Rights which the holder could have acquired if the holder had held the number of shares of Common Stock acquirable upon conversion of the Series B Preferred Stock (without regard to any limitations on conversion). If we declare or make any dividend or other distribution of its assets (or rights to acquire its assets) to holders of Common Stock, then a holder of Series B Preferred Stock is entitled to participate in such distribution to the same extent as if the holder had held the number of shares of Common Stock acquirable upon complete conversion of the Series B Preferred Stock (without regard to any limitations on conversion).

    Fundamental Transaction

        If, at any time while the Series B Preferred Stock is outstanding, (i) the Company, directly or indirectly, in one or more related transactions effects any merger or consolidation of the Company with or into another person, (ii) the Company, directly or indirectly, effects any sale, lease, license, assignment, transfer, conveyance or other disposition of all or substantially all of its assets in one or a series of related transactions, (iii) any, direct or indirect, purchase offer, tender offer or exchange offer (whether by the Company or another person) is completed pursuant to which holders of Common Stock are permitted to sell, tender or exchange their shares for other securities, cash or property and has been accepted by the holders of 50% or more of the outstanding Common Stock, (iv) the Company, directly or indirectly, in one or more related transactions effects any reclassification, reorganization or recapitalization of the Common Stock or any compulsory share exchange pursuant to


Table of Contents

which the Common Stock is effectively converted into or exchanged for other securities, cash or property, or (v) the Company, directly or indirectly, in one or more related transactions consummates a stock or share purchase agreement or other business combination (including, without limitation, a reorganization, recapitalization, spin-off or scheme of arrangement) with another person whereby such other person acquires more than 50% of the outstanding shares of Common Stock (not including any shares of Common Stock held by the other person or other persons making or party to, or associated or affiliated with the other persons making or party to, such stock or share purchase agreement or other business combination) (each a "Series B Preferred Stock Fundamental Transaction"), then the Series B Preferred Stock automatically converts and the holder will receive, for each Series B Conversion Share that would have been issuable upon such conversion immediately prior to the occurrence of such Series B Preferred Stock Fundamental Transaction (without regard to the Series B Beneficial Ownership Limitation), the number of shares of Common Stock of the successor or acquiring corporation or of the Company, if it is the surviving corporation, and any additional consideration (the "Series B Preferred Stock Alternate Consideration") receivable as a result of such Series B Preferred Stock Fundamental Transaction by a holder of the number of shares of Common Stock for which the Series B Preferred Stock is convertible immediately prior to such Series B Preferred Stock Fundamental Transaction (without regard to the Series B Beneficial Ownership Limitation). For purposes of any such conversion, the determination of the conversion ratio will be appropriately adjusted to apply to such Series B Preferred Stock Alternate Consideration based on the amount of Alternate Consideration issuable in respect of one share of Common Stock in such Series B Preferred Stock Fundamental Transaction. If holders of Common Stock are given any choice as to the securities, cash or property to be received in a Series B Preferred Stock Fundamental Transaction, then the holder will be given the same choice as to the Series B Preferred Stock Alternate Consideration it receives upon automatic conversion of the Series B Preferred Stock following such Fundamental Transaction.

Options and Warrants

        As of April 3, 2019, we had:

    54,940 shares of Common Stock issuable upon the exercise of stock options outstanding with a weighted average exercise price of approximately $448.27 per share;

    5,504,722 shares of Common Stock issuable upon the exercise of outstanding or issuable warrants at April 3, 2019 with a weighted average exercise price of approximately $9.11 per share (includes Common Stock issuable for warrants which are exercisable for our Series A or Series B Convertible Preferred Stock, each of which is convertible to Common Stock);

        Our tradable warrants are traded on the Nasdaq Capital Market under the symbol "ONTXW."

Delaware Anti-Takeover Law and Provisions in Our Certificate of Incorporation and Bylaws

    Delaware Anti-Takeover Law

        

We are subject to Section 203 of the Delaware General Corporation Law. Section 203 generally prohibits a public Delaware corporation from engaging in a “business combination”"business combination" with an “interested stockholder”"interested stockholder" for a period of three years after the date of the transaction in which the person became an interested stockholder, unless:

    ·prior to the date of the transaction, the board of directors of the corporation approved either the business combination or the transaction which resulted in the stockholder becoming an interested stockholder;

    ·

    upon consummation of the transaction that resulted in the stockholder becoming an interested stockholder, the interested stockholder owned at least 85% of the voting stock of the

Table of Contents

      corporation outstanding at the time the transaction commenced, excluding specified shares; or

    ·at or subsequent to the date of the transaction, the business combination is approved by the board of directors and authorized at an annual or special meeting of stockholders, and not by written consent, by the affirmative vote of at least 662/3%3% of the outstanding voting stock which is not owned by the interested stockholder.

        

Section 203 defines a “business combination”"business combination" to include:

    ·any merger or consolidation involving the corporation and the interested stockholder;

    ·

    any sale, lease, exchange, mortgage, pledge, transfer or other disposition of 10% or more of the assets of the corporation to or with the interested stockholder;

    ·

    subject to exceptions, any transaction that results in the issuance or transfer by the corporation of any stock of the corporation to the interested stockholder;

    ·

    subject to exceptions, any transaction involving the corporation that has the effect of increasing the proportionate share of the stock of any class or series of the corporation beneficially owned by the interested stockholder; or

    ·

    the receipt by the interested stockholder of the benefit of any loans, advances, guarantees, pledges or other financial benefits provided by or through the corporation.

        

In general, Section 203 defines an “interested stockholder”"interested stockholder" as any person that is:

    ·the owner of 15% or more of the outstanding voting stock of the corporation;

    ·

    an affiliate or associate of the corporation who was the owner of 15% or more of the outstanding voting stock of the corporation at any time within three years immediately prior to the relevant date; or

    ·

    the affiliates and associates of the above.

        

Under specific circumstances, Section 203 makes it more difficult for an “interested stockholder”"interested stockholder" to effect various business combinations with a corporation for a three-year period, although the stockholders may, by adopting an amendment to the corporation’scorporation's certificate of incorporation or bylaws, elect not to be governed by this section, effective 12 months after adoption.

        

Our Tenth Amended and Restated Certificate of Incorporation, as amended, or our “certificate"certificate of incorporation," and our Amended and Restated Bylaws, or our “bylaws,”"bylaws," do not exclude us from the restrictions of Section 203. We anticipate that the provisions of Section 203 might encourage companies interested in acquiring us to negotiate in advance with our board of directors since the stockholder approval requirement would be avoided if a majority of the directors then in office approve either the business combination or the transaction that resulted in the stockholder becoming an interested stockholder.

    Certificate of Incorporation and Bylaws

        

Provisions of our certificate of incorporation and bylaws may delay or discourage transactions involving an actual or potential change of control or change in our management, including transactions in which stockholders might otherwise receive a premium for their shares, or transactions that our stockholders might otherwise deem to be in their best interests. Therefore, these provisions could adversely affect the price of our common stock.Common Stock. Among other things, our certificate of incorporation and bylaws will:

·

    permit our board of directors to issue up to 5,000,000 shares of preferred stock, with any rights, preferences and privileges as they may designate;


·Table of Contents

    provide that all vacancies on our board of directors, including as a result of newly created directorships, may, except as otherwise required by law, be filled by the affirmative vote of a majority of directors then in office, even if less than a quorum;

    ·

    require that any action to be taken by our stockholders must be effected at a duly called annual or special meeting of stockholders and not be taken by written consent;

    ·

    provide that stockholders seeking to present proposals before a meeting of stockholders or to nominate candidates for election as directors at a meeting of stockholders must provide advance notice in writing, and also specify requirements as to the form and content of a stockholder’sstockholder's notice;

    ·

    not provide for cumulative voting rights, thereby allowing the holders of a majority of the shares of common stockCommon Stock entitled to vote in any election of directors to elect all of the directors standing for election; and

    ·

    provide that special meetings of our stockholders may be called only by the board of directors or by such person or persons requested by a majority of the board of directors to call such meetings.

Transfer Agent and Registrar

        

The transfer agent and registrar for our common stockCommon Stock is Wells Fargo Shareowner Services.

Listing

        

Our common stockCommon Stock is listed on the Nasdaq Capital Market under the symbol “ONTX.”"ONTX.

DESCRIPTION OF DEBT SECURITIES
SELLING STOCKHOLDER

        

This prospectus describes certain general terms and provisions of our debt securities. When weThe selling stockholder named below may offer to sell a particular series of debt securities, we will describe the specific terms of the series in a supplementfrom time to this prospectus. The following description of debt securities will apply to the debt securities offered by this prospectus unless we provide otherwisetime in the applicable prospectus supplement. The applicable prospectus supplement for a particular series of debt securities may specify different or additional terms.

We may offer under this prospectus up to $84,546,394 aggregate principal amount of secured or unsecured debt securities, or if debt securities are issued at a discount, or in a foreign currency or composite currency, such principal amount as may be sold for an initial public offering price of up to $84,546,394. The debt securities may be either senior debt securities, senior subordinated debt securities or subordinated debt securities. The debt securities offered hereby will be issued under an indenture between us and a trustee. A form of indenture, which will be qualified under, subject to, and governed by, the Trust Indenture Act of 1939, as amended, is filed as an exhibit to the registration statement.

General

The terms of each series of debt securities will be established by or pursuant to a resolution of our board of directors and detailed or determined in the manner provided in a board of directors’ resolution, an officers’ certificate or by an indenture. The particular terms of each series of debt securities will be described in a prospectus supplement relating to the series, including any pricing supplement.

We can issue debt securities that may be in one or more series with the same or various maturities, at par, at a premium or at a discount. We will set forth in a prospectus supplement, including any pricing supplement, relating to any series of debt securities being offered, the initial offering price, the aggregate principal amount and the following terms of the debt securities:

·                  the title of the debt securities;

·                  the price or prices (expressed as a percentage of the aggregate principal amount) at which we will sell the debt securities;

·                  any limit on the aggregate principal amount of the debt securities;

·                  the date or dates on which we will pay the principal on the debt securities;

·                  the rate or rates (which may be fixed or variable) per annum or the method used to determine the rate or rates (including any commodity, commodity index, stock exchange index or financial index) at which the debt securities will bear interest, the date or dates from which interest will accrue, the date or dates on which interest will commence and be payable and any regular record date for the interest payable on any interest payment date;

·                  the place or places where the principal of, and premium and interest on, the debt securities will be payable;

·                  the terms and conditions upon which we may redeem the debt securities;

·                  any obligation we have to redeem or purchase the debt securities pursuant to any sinking fund or analogous provisions or at the option of a holder of debt securities;

·                  the dates on which and the price or prices at which we will repurchase the debt securities at the option of the holders of debt securities and other detailed terms and provisions of these repurchase obligations;

·                  the denominations in which the debt securities will be issued, if other than denominations of $1,000 and any integral multiple thereof;

·                  whether the debt securities will be issued in the form of certificated debt securities or global debt securities;

·                  the portion of principal amount of the debt securities payable upon declaration of acceleration of the maturity date, if other than the principal amount;

·                  the currency of denomination of the debt securities;

·                  the designation of the currency, currencies or currency units in which payment of principal of, and premium and interest on, the debt securities will be made;

·                  if payments of principal of, and premium or interest on, the debt securities will be made in one or more currencies or currency units other than that or those in which the debt securities are denominated, the manner in which the exchange rate with respect to these payments will be determined;

·                  the manner in which the amounts of payment of principal of, and premium or interest on, the debt securities will be determined, if these amounts may be determined by reference to an index based on a currency or currencies other than that in which the debt securities are denominated or designated to be payable or by reference to a commodity, commodity index, stock exchange index or financial index;

·                  any provisions relating to any security provided for the debt securities;

·                  any addition to or change in the events of default described in this prospectus or in the indenture with respect to the debt securities and any change in the acceleration provisions described in this prospectus or in the indenture with respect to the debt securities;

·                  any addition to or change in the covenants described in this prospectus or in the indenture with respect to the debt securities;

·                  any other terms of the debt securities, which may modify or delete any provision of the indenture as it applies to that series; and

·                  any depositaries, interest rate calculation agents, exchange rate calculation agents or other agents with respect to the debt securities.

We may issue debt securities that are exchangeable and/or convertible into shares of our common stock or any class or series of preferred stock. The terms, if any, on which the debt securities may be exchanged and/or converted will be set forth in the applicable prospectus supplement. Such terms may include provisions for conversion, either mandatory, at the option of the holder or at our option, in which case the number of shares of common stock, preferred stock or other securities to be received by the holders of debt securities would be calculated as of a time and in the manner stated in the prospectus supplement.

We may issue debt securities that provide for an amount less than their stated principal amount to be due and payable upon declaration of acceleration of their maturity pursuant to the terms of the indenture. We will provide you with information on the federal income tax considerations and other special considerations applicable to any of these debt securities in the applicable prospectus supplement.

If we denominate the purchase price of any of the debt securities in a foreign currency or currencies or a foreign currency unit or units, or if the principal of and any premium and interest on any series of debt securities is payable in a foreign currency or currencies or a foreign currency unit or units, we will provide you with information on the restrictions, elections, general tax considerations, specific terms and other information with respect to that issue of debt securities and such foreign currency or currencies or foreign currency unit or units in the applicable prospectus supplement.

Payment of Interest and Exchange

Each debt security will be represented by either one or more global securities registered in the name of The Depository Trust Company, as Depositary, or a nominee of the Depositary (we will refer to any debt security represented by a global debt security as a book-entry debt security), or a certificate issued in definitive registered form (we will refer to any debt security represented by a certificated security as a certificated debt security), as described in the applicable prospectus supplement.

Certificated Debt Securities

You may transfer or exchange certificated debt securities at the trustee’s office or paying agencies in accordance with the terms of the indenture. No service charge will be made for any transfer or exchange of certificated debt securities, but we may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection with a transfer or exchange.

You may transfer certificated debt securities and the right to receive the principal of, and premium and interest on, certificated debt securities only by surrendering the old certificate representing those certificated debt securities and either we or the trustee will reissue the old certificate to the new holder or we or the trustee will issue a new certificate to the new holder.

Book-Entry Debt Securities

We may issue the debt securities of a series in the form of one or more book-entry debt securities that would be deposited with a depositary or its nominee identified in the prospectus supplement. We may issue book-entry debt securities in either temporary or permanent form. We will describe in the prospectus supplement the terms of any depositary arrangement and the rights and limitations of owners of beneficial interests in any book-entry debt security.

DESCRIPTION OF WARRANTS

We may issue warrants to purchase debt securities, common stock, preferred stock or other securities or any combination of the foregoing. We may issue warrants independently or together with other securities. Warrants sold with other securities may be attached to or separate from the other securities. We will issue warrants under one or more warrant agreements between us and a warrant agent that we will name in the prospectus supplement.

The prospectus supplement relating to any warrants that we may offer will include specific terms relating to the offering. We will file the form of any warrant agreement with the SEC, and you should read the warrant agreement for provisions that may be important to you. The prospectus supplement will include some or all of the following terms:

·                  the title of the warrants;

·                  the aggregate number of warrants offered;

·                  the designation, number and terms of the debt securities, common stock, preferred stock or other securities purchasable upon exercise of the warrants, and procedures by which those numbers may be adjusted;

·                  the exercise price of the warrants;

·                  the dates or periods during which the warrants are exercisable;

·                  the designation and terms of any securities with which the warrants are issued;

·                  if the warrants are issued as a unit with another security, the date, if any, on and after which the warrants and the other security will be separately transferable;

·                  if the exercise price is not payable in U.S. dollars, the foreign currency, currency unit or composite currency in which the exercise price is denominated;

·                  any minimum or maximum amount of warrants that may be exercised at any one time;

·                  any terms, procedures and limitations relating to the transferability, exchange, exercise, amendment or termination of the warrants; and

·                  any adjustments to the terms of the warrants resulting from the occurrence of certain events or from the entry into or consummation by us of certain transactions.

As of November 17, 2017, we had (i) non-tradable warrants with an expiration date of July 2021 to purchase 96,842 shares of common stock at an exercise price of $11.50 per share, (ii) tradable warrants with an expiration date of July 2021 to purchase 3,192,022 shares of common stock at an exercise price of $4.92 per share and (iii) non-tradable pre-funded warrants with an expiration date of July 2023 to purchase 5,907 shares of common stock at an exercise price of $0.01 per share.  Our tradable warrants are traded on the Nasdaq Capital Market under the symbol “ONTXW.”

DESCRIPTION OF UNITS

As specified in any applicable prospectus supplement, we may issue units consisting of one or more warrants, debt securities, shares of preferred stock, shares of common stock or any combination of such securities.

SELLING STOCKHOLDERS

Selling Stockholders for the Secondary Offering of up to 100 Shares of Common Stock

This prospectus also relates to the possible resale by certain of our stockholders offuture up to an aggregate of 10054,463 shares of our common stockCommon Stock, which were previously acquired by such stockholdersstockholder through severala private placements of our preferred stock completed by us prior to our IPO,placement transaction which were all converted to shares of our common stock in connection with our IPO.is further described below. In connection with such private placements, these persons haveplacement, the selling stockholder has registration rights with respect to theirits shares as described further below under the heading “Certain"Certain Relationships and Related Party Transactions."

        

Information about the selling stockholders including , where applicable, their identities, the amount of shares of common stock owned by each selling stockholder prior to the offering, the number of shares of our common stock to be offered by each selling stockholder and the amount of common stock to be owned by each selling stockholder after completion of the offering, will be set forth in an applicable prospectus supplement, documents incorporated by reference or in a free writing prospectus we file with the SEC. The applicable prospectus supplement will also disclose whether any of the selling stockholders has held any position or office with, has been employed by or otherwise has had a material relationship with us during the three years prior to the date of the prospectus supplement.

Unless otherwise indicated, the selling stockholders havestockholder has sole voting and investment power with respect to theirits shares of common stock. TheCommon Stock. All of the information contained in the table below is based solely upon information provided to us by the selling stockholdersstockholder or otherwise known by us. In addition to the shares offered hereby, the selling stockholder may otherwise beneficially own our shares of common stockCommon Stock as a result of, among others, open market purchases, which information is not obtainable by us without undue effort and expense. The selling stockholdersstockholder may have sold, transferred or otherwise disposed of, or may sell, transfer or otherwise dispose of, at any time or from time to time since the date on which the information regarding the shares beneficially owned was last known by us, all or a portion of the shares beneficially owned in transactions exempt from the registration requirements of the Securities Act.

        

TheInformation concerning the selling stockholders shall not sellstockholder may change from time to time and any shares of our common stock pursuantchanged information will be set forth in supplements to this prospectus, until we have identified suchif and when necessary. The selling stockholders and the shares being offered for resale by such selling stockholders in a subsequent prospectus supplement. However, the selling stockholdersstockholder may selloffer all, some or transfer all or a portionnone of their shares of Common Stock. We cannot advise you as to whether the selling stockholder will in fact sell any or all of such shares of Common Stock.

        The number of shares outstanding and the percentages of beneficial ownership are based on 5,895,004 shares of our common stock pursuant to any available exemption fromCommon Stock outstanding as of April 3, 2019.


Table of Contents

        For the registration requirementspurposes of the Securities Act.following table, the number of shares of our Common Stock beneficially owned has been determined in accordance with Rule 13d-3 under the Exchange Act, and such information is not necessarily indicative of beneficial ownership for any other purpose. Under Rule 13d-3, beneficial ownership includes any shares as to which the selling stockholder has sole or shared voting power or investment power and also any shares which that selling stockholder has the right to acquire within 60 days of the date of this prospectus through the exercise of any stock option.

 
 Number of Shares
Beneficially
Owned Prior to
the Offering
  
 Number of Shares
Beneficially
Owned After
the Offering(1)
 
 
 Number of
Shares Offered
 
 
 Number Percentage Number Percentage 
Name of Selling Stockholder
  
 

Pint Pharma GmbH

  54,463 *  54,463  0  0 

*
Represents less than 1%.

(1)
Assumes that all shares registered hereunder will be sold by the selling stockholder and that the selling stockholder does not acquire any additional shares.

Certain Relationships and Related Party Transactions

        

WeIn March 2018, we entered into an Eighth Amendeda License, Development and Restated Stockholders’Commercialization Agreement on July 27, 2012,(the "License Agreement") with certain holders of our common and preferred stock.Pint International SA (which, together with its affiliate Pint Pharma GmbH, are collectively referred to as "Pint"). Under the stockholders’terms of the License Agreement, we granted Pint an exclusive, royalty-bearing license, with the right to sublicense, under certain Company patent rights and know-how to develop and commercialize any pharmaceutical product (the "Product") containing rigosertib in all uses of rigosertib or the Product in humans (the "Field") in Latin America countries (the "Territory," including Argentina, Belize, Bolivia, Brazil, Chile, Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, El Salvador, French Guiana, British Guiana, Suriname, Guatemala, Haiti, Honduras, Mexico, Nicaragua, Panama, Paraguay, Peru, Uruguay and Venezuela). We retain the right to develop and commercialize pharmaceutical products containing rigosertib worldwide except for the sale of the Product in the Field in the Territory.

        Pint has agreed to make an upfront equity investment and a subsequent equity investment in our Common Stock. In addition, we could receive up to $41.5 million in additional regulatory, development and sales-based milestone payments as well as tiered, double digit royalties based on net aggregate net sales in the Territory. Pint also has agreed to purchase rigosertib and the Product exclusively from us in accordance with a supply and quality agreement holdersbetween the parties.

        Under the terms of the Securities Purchase Agreement, Pint made an upfront equity investment in the Company at a specified premium to our share price. Closing of the upfront equity investment occurred on April 4, 2018, whereby Pint purchased 54,463 shares of our preferred stock haveCommon Stock for $1,250,000. The total amount of the premium was $319,000 and this amount was allocated to the license.

        Pint may terminate the License Agreement in whole (but not in part) at any time upon 45 days' prior written notice. The License Agreement also contains customary provisions for termination by either party in the event of breach of the License Agreement by the other party, subject to a cure period, or bankruptcy of the other party.

        Pursuant to the Securities Purchase Agreement, Pint has been granted registration rights with respect to the shares of common stock issued upon conversionCommon Stock as further described below.


Table of Contents

Demand Registration Rights

        

At any time,Pursuant to the holdersSecurities Purchase Agreement, if Pint owns shares which are Registrable Securities (as defined in the Securities Purchase Agreement) on April 4, 2019 or the day that is ten calendar days following the closing date of 25% or morePint's purchase of additional shares of Common Stock upon our achievement of the shares having demand registration rights may request that we register all or a portion of their shares of common stock. We will effect the registration as requested, unless,Research and Development Event (as defined in the good faith judgment of our board of directors, such registration would be materially detrimental to us and our stockholders and should be delayed. We have the right to defer the filing of such registration statement once for up to 120 days during any 12-month period. WeLicense Agreement), we are not obligatedrequired to file a registration statement pursuant to this provisionregister the resale of the applicable unregistered Registrable Securities on more than two occasions. In addition, whena registration statement on Form S-3 (or such other form appropriate for such purpose if we are eligibledo not meet the eligibility requirements for the use of Form S-3, or any successor form, holders of a majority of the shares having demand registration rights may make unlimited requests that we register all or a portion of their common stock for saleS-3) under the Securities Act on Form S-3, or any successor form, so long as the aggregate priceand use reasonable best efforts to the public in connection with anyhave such offering is at least $500,000. However, we are not obligated to file a Form S-3 pursuant to this provision on more than two occasions in any 12-month period.

Piggyback Registration Rights

In addition, if at any time we register any shares of our stock, the holders of all shares having registration rights are entitled to notice of the filing of the applicable registration statement declared effective and to include all ormaintain the effectiveness of such registration statement for a portion of their common stock inperiod ending on the registration.date Pint no longer holds Registrable Securities.

        

The secondary offering of up to 100 shares of our common stock is being made pursuant to the exercise of these piggyback registration rights.

Other Provisions

In the event that any registration in which the holders of registrable shares participate pursuant to the stockholders’ agreement is an underwritten public offering, the number of registrable shares to be included may, in specified circumstances, be limited due to market conditions. The number of registrable shares to be excluded from registration pursuant to the above shall not be reduced below 20% of the shares to be offered.

We will pay all registration expenses, other than underwriting discountsthe fees and selling commissions,disbursements of counsel for Pint, incurred in connection with registrations, filings or qualifications relating to the resale registration statement, including all registration, filing and qualification fees; printers' and accounting fees; fees and disbursements of our counsel; and the reasonable fees and expenses, other than underwriting discounts and selling commissions, anddisbursements. Pint will pay the reasonable fees and expensesdisbursements of a single special counsel forits counsel.


PLAN OF DISTRIBUTION

        The Common Stock offered by this prospectus is being offered by Pint, the selling stockholders, related to any demand or piggyback registration.

PLAN OF DISTRIBUTION

We and/or the selling stockholders, if applicable, may sell the securities in one or more of the following ways (or in any combination) from time to time:

·                  to or through one or more underwriters or dealers in a public offering and sale by them;

·                  directly to a limited number of purchasers or to a single purchaser;

·                  through agents;

·                  through block trades in which the broker or dealer engaged to handle the block trade will attempt to sell the securities as agent, but may position and resell a portion of the block as principal to facilitate the transaction; or

·                  in any manner, as provided in the applicable prospectus supplement.

Each time we offer and sell securities under this prospectus, we will file a prospectus supplement.stockholder. The prospectus supplement will state the terms of the offering of the securities, including:

·                  the name or names of any underwriters, dealers or agents;

·                  the purchase price of such securities and the proceeds to be received by us, if any;

·                  any underwriting discounts or agency fees and other items constituting underwriters’ or agents’ compensation;

·                  any public offering price;

·                  any discounts or concessions allowed or reallowed or paid to dealers; and

·                  any securities exchanges on which the securitiesCommon Stock may be listed.

Any public offering price and any discountssold or concessions allowed or reallowed or paid to dealers may be changed from time to time.

If we and/or the selling stockholders, if applicable, use underwriters in the sale, the securities will be acquired by the underwriters for their own account and may be resolddistributed from time to time inby the selling stockholder directly to one or more transactions, including:

·                  negotiated transactions;

·                  at a fixed public offering pricepurchasers or prices, whichthrough brokers, dealers, or underwriters who may be changed;

·act solely as agents at market prices prevailing at the time of sale;

·sale, at prices related to the prevailing market prices; or

·prices, at negotiated prices.

Unless otherwise stated in a prospectus supplement, the obligations of the underwriters to purchase any securities willprices, or at fixed prices, which may be conditioned on customary closing conditions and the underwriters will be obligated to purchase all of such series of securities, if any are purchased.

We and/or the selling stockholders, if applicable, may sell the securities through agents from time to time.changed. The prospectus supplement will name any agent involved in the offer or sale of the securities and any commissions we pay to them. Generally, any agent will be acting on a best efforts basis for the period of its appointment.

We and/or the selling stockholders, if applicable, may authorize underwriters, dealers or agents to solicit offers by certain purchasers to purchase the securities from us at the public offering price set forth in the prospectus supplement pursuant to delayed delivery contracts providing for payment and delivery on a specified date in the future. The contracts will be subject only to those conditions set forth in the prospectus supplement, and the prospectus supplement will set forth any commissions we pay for solicitation of these contracts.

In offering the shares coveredCommon Stock offered by this prospectus may be effected in one or more of the following methods:

    ordinary brokers' transactions;

    transactions involving cross or block trades;

    through brokers, dealers, or underwriters who may act solely as agents;

    in other ways not involving market makers or established business markets, including direct sales to purchasers or sales effected through agents;

    in privately negotiated transactions; or

    any combination of the foregoing.

        The selling stockholder may also sell shares of common stock under Rule 144 promulgated under the Securities Act, if available, rather than under this prospectus. In addition, the selling stockholders, and any broker-dealers and anystockholder may transfer the shares of common stock by other means not described in this prospectus.

        Brokers, dealers, underwriters, or agents participating broker-dealers whoin the distribution of the shares as agents may execute sales forreceive compensation in the form of commissions, discounts, or concessions from the selling stockholders,stockholder and/or purchasers of the common stock for whom the broker-dealers may be deemed to be “underwriters”act as agent.

        The selling stockholder is an "underwriter" within the meaning of the Securities ActAct.

        Neither we nor Pint can presently estimate the amount of compensation that any agent will receive. We know of no existing arrangements between Pint, any other stockholder, broker, dealer, underwriter, or agent relating to the sale or distribution of the shares offered by this prospectus. At the time a particular offer of shares is made, a prospectus supplement, if required, will be distributed that will set forth the names of any agents, underwriters, or dealers and any compensation from the selling stockholder, and any other required information.


Table of Contents

        We have agreed to indemnify Pint and certain other persons against certain liabilities in connection with these sales. Any profits received by the selling stockholders andoffering of shares of Common Stock offered hereby, including liabilities arising under the compensationSecurities Act or, if such indemnity is unavailable, to contribute amounts required to be paid in respect of such broker-dealers may be deemedliabilities. Pint has agreed to be underwriting discounts and commissions.

Underwriters and agents may be entitled under agreements entered into withindemnify us and/or the selling stockholders, if applicable, to indemnification by us and/or the selling stockholders, if applicable, against certain civil liabilities, including liabilities under the Securities Act that may arise from certain written information furnished to us by Pint specifically for use in this prospectus or, if such indemnity is unavailable, to contribution withcontribute amounts required to be paid in respect to payments whichof such liabilities.

        Insofar as indemnification for liabilities arising under the underwriters or agentsSecurities Act may be permitted to our directors, officers, and controlling persons, we have been advised that in the opinion of the SEC this indemnification is against public policy as expressed in the Securities Act and is therefore, unenforceable.

        Pursuant to the Securities Purchase Agreement, the selling stockholder has agreed that it and persons acting on its behalf will not to engage in any direct or indirect short sales of our Common Stock.

        We have advised Pint that while it is engaged in a distribution of the shares included in this prospectus it is required to make. Underwriterscomply with Regulation M promulgated under the Securities Exchange Act of 1934, as amended. With certain exceptions, Regulation M precludes the selling stockholder, any affiliated purchasers, and agents may be customers of, engage in transactions with,any broker-dealer or perform services for us and our affiliatesother person who participates in the ordinary course of business.

Each series of securities will be a new issue of securities and will have no established trading market other than the common stockdistribution from bidding for or purchasing, or attempting to induce any person to bid for or purchase any security which is listedthe subject of the distribution until the entire distribution is complete. Regulation M also prohibits any bids or purchases made in order to stabilize the price of a security in connection with the distribution of that security. All of the foregoing may affect the marketability of the shares offered in this prospectus.

        We may suspend the sale of shares by Pint pursuant to this prospectus for certain periods of time for certain reasons, including if the prospectus is required to be supplemented or amended to include additional material information.

        This offering will terminate on the Nasdaq Capital Market. Any underwriters to whom securitiesearlier of (i) date that all shares purchased by Pint under the Securities Purchase Agreement have been sold by Pint or (ii) the date that all shares purchased by Pint under the Securities Purchase Agreement are sold for public offering and sale may make a market in the securities, but such underwriters will not be obligated to do so and may discontinue any market making at any time without notice. The securities, other than the common stock, may or may not be listed on a national securities exchange.no longer Registrable Securities.


EXPERTS

        

EXPERTS

The consolidated financial statements of Onconova Therapeutics, Inc. at December 31, 2016 and 2015, and for the years then ended, appearing in our Annual Report (Form 10-K) for the year ended December 31, 20162018 have been audited by Ernst & Young LLP, independent registered public accounting firm, as set forth in their report thereon (which contains an explanatory paragraph describing conditions that raise substantial doubt about the Company’sCompany's ability to continue as a going concern as described in Note 1 to the consolidated financial statements) included therein, and incorporated herein by reference. Such financial statements are incorporated herein by reference in reliance upon such report given on the authority of such firm as experts in accounting and auditing.


LEGAL MATTERS

        

The validity of the securities being offered by this prospectus will be passed upon by Morgan, Lewis & Bockius LLP, Philadelphia, Pennsylvania.


Table of Contents


PART II



Information Not Required in Prospectus

Item 14.    Other Expenses of Issuance and Distribution

        

The following table sets forth the expenses (other than underwriting discounts and commissions) to be incurred by us in connection with the registration, issuance and distribution of the securities described in this registration statement being registered hereby.

Securities and Exchange Commission registration fee

$

(1)

FINRA fee (if applicable)

*

Printing expenses

*

Legal fees and expenses

*

Accounting fees and expenses

*

Transfer agent and trustee fees and expenses

*

Miscellaneous

*

Total

$

*


(1)                                 Previously paid. See Footnote (3) to the “Calculation of Registration Fee” table on the cover page of this Registration Statement.

*                                         These fees are dependent on the type and number of securities offered and cannot be determined at this time. Additional information regarding estimated fees and expenses will be provided at the time that such information is required to be included in a prospectus supplement in accordance with Rule 430B.

SEC registration fee

 $21.46 

Legal fees and expenses

 $15,000 

Accounting fees and expenses

 $7,500 

Transfer agent and miscellaneous expenses

 $2,000 

Total

 $24,521.46 

Item 15.    Indemnification of Directors and Officers

        

We are incorporated under the laws of the State of Delaware. Section 145 of the Delaware General Corporation Law provides that a Delaware corporation may indemnify any persons who are, or are threatened to be made, parties to any threatened, pending or completed action, suit or proceeding, whether civil, criminal, administrative or investigative (other than an action by or in the right of such corporation), by reason of the fact that such person was an officer, director, employee or agent of such corporation, or is or was serving at the request of such person as an officer, director, employee or agent of another corporation or enterprise. The indemnity may include expenses (including attorneys’attorneys' fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by such person in connection with such action, suit or proceeding, provided that such person acted in good faith and in a manner he or she reasonably believed to be in or not opposed to the corporation’scorporation's best interests and, with respect to any criminal action or proceeding, had no reasonable cause to believe that his or her conduct was illegal. A Delaware corporation may indemnify any persons who are, or are threatened to be made, a party to any threatened, pending or completed action or suit by or in the right of the corporation by reason of the fact that such person was a director, officer, employee or agent of such corporation, or is or was serving at the request of such corporation as a director, officer, employee or agent of another corporation or enterprise. The indemnity may include expenses (including attorneys’attorneys' fees) actually and reasonably incurred by such person in connection with the defense or settlement of such action or suit provided that such person acted in good faith and in a manner he or she reasonably believed to be in or not opposed to the corporation’scorporation's best interests except that no indemnification is permitted without judicial approval if the officer or director is adjudged to be liable to the corporation. Where an officer or director is successful on the merits or otherwise in the defense of any action referred to above, the corporation must indemnify him or her against the expenses which such officer or director has actually and reasonably incurred. Our certificate of incorporation and bylaws provide for the indemnification of our directors and officers to the fullest extent permitted under the Delaware General Corporation Law.

        

II-1



Table of Contents

Section 102(b)(7) of the Delaware General Corporation Law permits a corporation to provide in its certificate of incorporation that a director of the corporation shall not be personally liable to the corporation or its stockholders for monetary damages for breach of fiduciary duties as a director, except for liability for any:

    ·transaction from which the director derives an improper personal benefit;

    ·

    act or omission not in good faith or that involves intentional misconduct or a knowing violation of law;

II-1


·Table of Contents

    unlawful payment of dividends or redemption of shares; or

    ·

    breach of a director’sdirector's duty of loyalty to the corporation or its stockholders.

        

Our certificate of incorporation includes such a provision. Expenses incurred by any officer or director in defending any such action, suit or proceeding in advance of its final disposition shall be paid by us upon delivery to us of an undertaking, by or on behalf of such director or officer, to repay all amounts so advanced if it shall ultimately be determined that such director or officer is not entitled to be indemnified by us.

        

As permitted by the Delaware General Corporation Law, we have entered into indemnification agreements with our directors and executive officers. These agreements, among other things, require us to indemnify each director and officer to the fullest extent permitted by law and advance expenses to each indemnitee in connection with any proceeding in which indemnification is available.

        

At present, there is no pending litigation or proceeding involving any of our directors or executive officers as to which indemnification is required or permitted, and we are not aware of any threatened litigation or proceeding that may result in a claim for indemnification.

        

We have an insurance policy covering our officers and directors with respect to certain liabilities, including liabilities arising under the Securities Act.

Item 16.    Exhibits

        

A list of exhibits filed herewith is contained in the exhibit index that immediately precedes such exhibits and is incorporated herein by reference.

Item 17.    Undertakings

        

The undersigned registrant hereby undertakes:

    (1)
    To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:



    (i)
    To include any prospectus required by section 10(a)(3) of the Securities Act of 1933;

    Act;

    (ii)
    To reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with the SEC pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than 20% change in the maximum aggregate offering price set forth in the “Calculation"Calculation of Registration Fee”Fee" table in the effective registration statement; and



    (iii)
    To include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information in the registration statement;

      provided, however, that paragraphs (i), (ii) and (iii) do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the SEC by the registrant pursuant to Section 13 or Section 15(d) of the Exchange Act that are incorporated by reference in the registration statement, or is contained in a form of prospectus filed pursuant to Rule 424(b) that is part of the registration statement.

II-2


Table of Contents

    (2)
    That, for the purpose of determining any liability under the Securities Act, of 1933, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.



    (3)
    To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.



    (4)
    That, for the purpose of determining liability under the Securities Act to any purchaser:



    (A)
    Each prospectus filed by the registrant pursuant to Rule 424(b)(3) shall be deemed to be part of the registration statement as of the date the filed prospectus was deemed part of and included in the registration statement; and



    (B)
    (B) Each prospectus required to be filed pursuant to Rule 424(b)(2), (b)(5) or (b)(7) as part of a registration statement in reliance on Rule 430B relating to an offering made pursuant to Rule 415(a)(1)(i), (vii) or (x) for the purpose of providing the information required by Section 10(a) of the Securities Act shall be deemed to be part of and included in the registration statement as of the earlier of the date such form of prospectus is first used after effectiveness or the date of the first contract of sale of securities in the offering described in the prospectus. As provided in Rule 430B, for liability purposes of the issuer and any person that is at that date an underwriter, such date shall be deemed to be a new effective date of the registration statement relating to the securities in the registration statement to which the prospectus relates, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.Provided,however, that no statement made in a registration statement or prospectus that is part of the registration statement or made in a document incorporated or deemed incorporated by reference into the registration statement or prospectus that is part of the registration statement will, as to a purchaser with a time of contract of sale prior to such effective date, supersede or modify any statement that was made in the registration statement or prospectus that was part of the registration statement or made in any such document immediately prior to such effective date; or

    (5) That, for the purpose of determining liability of the registrant under the Securities Act to any purchaser in the initial distribution of the securities, the undersigned registrant undertakes that in a primary offering of securities of the undersigned registrant pursuant to this registration statement, regardless of the underwriting method used to sell the securities to the purchaser, if the securities are offered or sold to such purchaser by means of any of the following communications, the undersigned registrant will be a seller to the purchaser and will be considered to offer or sell such securities to such purchaser:

    (i) Any preliminary prospectus or prospectus of the undersigned registrant relating to the offering required to be filed pursuant to Rule 424;

    (ii) Any free writing prospectus relating to the offering prepared by or on behalf of the undersigned registrant or used or referred to by the undersigned registrant;

    (iii) The portion of any other free writing prospectus relating to the offering containing material information about the undersigned registrant or its securities provided by or on behalf of the undersigned registrant; and

    (iv) Any other communication that is an offer in the offering made by the undersigned registrant to the purchaser.

    (6) 

    That, for purposes of determining any liability under the Securities Act, each filing of the registrant’sregistrant's annual report pursuant to Section 13(a) or 15(d) of the Exchange Act (and, where applicable, each filing of an employee benefit plan’splan's annual report pursuant to Section 15(d) of the Exchange Act) that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

    II-2



Table of Contents

(7) 

(6)
Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the registrant pursuant to the foregoing provisions, or otherwise, the registrant has been advised that in the opinion of the Securities and Exchange CommissionSEC such indemnification is against public policy as expressed in the Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Act and will be governed by the final adjudication of such issue.

II-3


(8) To file an application for the purpose of determining the eligibility of the trustee to act under subsection (a) of Section 310 of the Trust Indenture Act in accordance with the rules and regulations prescribed by the Commission under Section 305(b)(2) of the Act.

II-3



Table of Contents


EXHIBIT INDEX

Exhibit No.Description of Exhibit
3.1Tenth Amended and Restated Certificate of Incorporation of Onconova Therapeutics, Inc. (Incorporated by reference to Exhibit 3.1 to the Company's Current Report on Form 8-K filed on July 30, 2013)


3.2


Amended and Restated Bylaws of Onconova Therapeutics, Inc. (Incorporated by reference to Exhibit 3.2 to the Company's Current Report on Form 8-K filed on July 30, 2013)


3.3


Certificate of Amendment to Tenth Amended and Restated Certificate of Incorporation of Onconova Therapeutics, Inc. (Incorporated by reference to Exhibit 3.1 to the Company's Current Report on Form 8-K filed on May 31, 2016)


3.4


Certificate of Amendment to Tenth Amended and Restated Certificate of Incorporation of Onconova Therapeutics, Inc., as amended (Incorporated by reference to Exhibit 3.1 to the Company's Current Report on Form 8-K filed on March 22, 2018)


3.5


Certificate of Amendment to Tenth Amended and Restated Certificate of Incorporation of Onconova Therapeutics, Inc., as amended (Incorporated by reference to Exhibit 3.1 to the Company's Current Report on Form 8-K filed on June 8, 2018)


3.6


Certificate of Amendment to Tenth Amended and Restated Certificate of Incorporation of Onconova Therapeutics, Inc., as amended(Incorporated by reference to Exhibit 3.1 to the Company's Current Report on Form 8-K filed on September 25, 2018)


4.1


Form of Certificate of Common Stock (Incorporated by reference to Exhibit 4.1 to Pre-Effective Amendment No. 1 the Company's Registration Statement on Form S-1 filed on July 11, 2013)


4.2

+

License, Development and Commercialization Agreement, dated as of March 2, 2018, by and between Onconova Therapeutics, Inc. and Pint International SA (Incorporated by reference to Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q filed on May 15, 2018)


4.3


Securities Purchase Agreement, dated as of March 2, 2018, by and between Onconova Therapeutics, Inc. and Pint Pharma GmbH (Incorporated by reference to Exhibit 10.2 to the Company's Quarterly Report on Form 10-Q filed on May 15, 2018)


5.1

*

Opinion of Morgan, Lewis & Bockius LLP


23.1

*

Consent of Ernst & Young LLP


23.3

*

Consent of Morgan, Lewis & Bockius LLP (included in the opinion filed as Exhibit 5.1)


24.1

*

Power of attorney (included on the signature page of this registration statement)

*
Filed herewith.

+
Confidential treatment has been requested with respect to certain portions of this exhibit. Omitted portions have been filed separately with the SEC.

II-4


Table of Contents

SIGNATURES

        

Pursuant to the requirements of the Securities Act of 1933, as amended, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in Newtown, Pennsylvania on November 20, 2017.April 5, 2019.

Onconova Therapeutics, Inc.

By:

/s/ STEVEN M. FRUCHTMAN, M.D.


Name:Steven M. Fruchtman, M.D.

By:

/s/ RAMESH KUMAR, PH.D

Name:

Title:

Ramesh Kumar, Ph.D

Title:

President and Chief Executive Officer



Table of Contents

POWER OF ATTORNEY

        

KNOW ALL MEN BY THESE PRESENTS, that the undersigned officers and directors of Onconova Therapeutics, Inc., a Delaware corporation (the “Corporation”"Corporation"), hereby constitute and appoint each of Ramesh Kumar, Ph.DSteven M. Fruchtman, M.D., Mark Guerin and Mark GuerinAvi Oler the true and lawful agents and attorneys-in-fact of the undersigned with full power and authority in said agents and attorneys-in-fact, and in any one or more of them, to sign for the undersigned and in their respective names as an officer/director of the Corporation, any and all amendments (including post-effective amendments) to this registration statement on Form S-3 (or any other registration statement for the same offering that is to be effective upon filing pursuant to Rule 462(b) under the Securities Act) and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, and with full power of substitution, hereby ratifying and confirming all that each of said attorneys-in-fact, or his substitute or substitutes, may do or cause to be done by virtue hereof.

        

Pursuant to the requirements of the Securities Act of 1933, as amended, this registration statement has been signed by the following persons in the capacities indicated on November 20, 2017.April 5, 2019.

Name

Title




/s/ RAMESH KUMAR, PH.D.

STEVEN M. FRUCHTMAN, M.D.

Steven M. Fruchtman, M.D.

Director, President and Chief Executive Officer (Principal Executive Officer)

Ramesh Kumar, Ph.D.


/s/ MARK GUERIN



Mark Guerin



Chief Financial Officer (Principal Financial Officer and Principal Accounting Officer)

Mark Guerin


/s/ MICHAEL B. HOFFMAN

Michael B. Hoffman



Chairman, Board of Directors

/s/ HENRY S. BIENEN, PH.D. 

Director

Henry S. Bienen, Ph.D.


/s/ JEROME E. GROOPMAN, M.D.

Director



Jerome E. Groopman, M.D.



Director

/s/ MICHAEL B. HOFFMAN 

Chairman, Board of Directors

Michael B. Hoffman


/s/ JAMES J. MARINO

Director



James J. Marino


/s/ VIREN MEHTA, PHARM.D 


Director

Viren Mehta, Pharm.D

/s/ E. PREMKUMAR REDDY, PH.D 

Director

E. Premkumar Reddy, Ph.D

/s/ JACK E. STOVER 

Director

Jack E. Stover




Table of Contents

EXHIBIT INDEX

Exhibit No. 

Description of Exhibit Name

Title



1.1

/s/ VIREN MEHTA, PHARM.D

Viren Mehta, Pharm.D

*

Form of Underwriting Agreement

Director


/s/ E. PREMKUMAR REDDY, PH.D

E. Premkumar Reddy, Ph.D



Director

3.1


/s/ JACK E. STOVER

Jack E. Stover



Tenth Amended and Restated Certificate of Incorporation of Onconova Therapeutics, Inc. (Incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K filed on July 30, 2013)Director

3.2

Amended and Restated Bylaws of Onconova Therapeutics, Inc. (Incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K filed on July 30, 2013)

3.3

Certificate of Amendment to Tenth Amended and Restated Certificate of Incorporation of Onconova Therapeutics, Inc. (Incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K filed on May 31, 2016)

4.1

Form of Certificate of Common Stock (Incorporated by reference to Exhibit 4.1 to Pre-Effective Amendment No. 1 the Company’s Registration Statement on Form S-1 filed on July 11, 2013)

4.2

Eighth Amended and Restated Stockholders’ Agreement, effective as of July 27, 2012, by and among Onconova Therapeutics, Inc. and certain stockholders named therein (Incorporated by reference to Exhibit 4.2to Pre-Effective Amendment No. 1 to the Company’s Registration Statement on Form S-1 filed on July 11, 2013)

4.3

Amendment No. 1 to Eighth Amended and Restated Stockholders’ Agreement, effective as of July 9, 2013 (Incorporated by reference to Exhibit 4.2 to Pre-Effective Amendment No. 1 the Company’s Registration Statement on Form S-1 filed on July 11, 2013)

4.4

*

Form of Preferred Stock Certificate

4.5

*

Form of any Certificate of Designation setting forth the preferences and rights with respect to any preferred stock issued hereunder

4.6

Form of Indenture (Incorporated by reference to Exhibit 4.6 to the Company’s Registration Statement on Form S-3 filed on October 8, 2014)

4.5

*

Form of Debt Securities

4.6

*

Form of Warrant

4.7

*

Form of Warrant Agreement for Common Stock, including Warrant Certificate for Common Stock

4.8

*

Form of Warrant Agreement for Preferred Stock, including Warrant Certificate for Preferred Stock

4.9

*

Form of Warrant Agreement for Debt Securities, including Warrant Certificate for Debt Securities

4.10

*

Form of Unit Agreement

5.1

Opinion of Morgan, Lewis & Bockius LLP

23.1

Consent of Ernst & Young LLP

23.3

Consent of Morgan, Lewis & Bockius LLP (included in the opinion filed as Exhibit 5.1)

24.1

Power of attorney (included on the signature page of this registration statement)

25.1

**

Form T-1 Statement of Eligibility and Qualification under the Trust Indenture Act of 1939 of Trustee for Form of Indenture.



*          To be filed by amendment or as an exhibit to a report pursuant to Section 13(a), 13(c) or 15(d) of the Exchange Act.

**   To be filed in accordance with the requirements of Section 305(b)(2) of the Trust Indenture Act of 1939 and Rule 5b-3 thereunder.