UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 10-Q

     (MARK ONE)
     [X] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE
         SECURITIES EXCHANGE ACT OF 1934
         For the Quarterly Period Ended September 30, 1998
                                       OR
     [ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES
         EXCHANGE ACT OF 1934

     Commission File Number 0-22769



                                 LEUKOSITE, INC.
             (Exact name of registrant as specified in its charter)

 DELAWARE                                                    04-3173859
(State or other jurisdiction of                              (I.R.S. Employer
incorporation or organization)                               Identification No.)


215 FIRST STREET                                                           02142
CAMBRIDGE, MASSACHUSETTS                                              (Zip Code)
(Address of principal executive offices)


       Registrant's telephone number, including area code: (617) 621-9350



     Indicate by check mark whether the registrant: (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.

     Yes       X                            No
          ---------                            -----

     The number of shares outstanding of each of the registrant's classes of
common stock as of:

         Date                   Class                      Outstanding Shares
   November 3, 1998        Common Stock, $.01 par value        11,900,842

- -----------------------------------------------------------------------------



                                 LEUKOSITE, INC.
                         ( A Development Stage Company)
                                    FORM 10-Q

                    FOR THE QUARTER ENDED SEPTEMBER 30, 1998


                                TABLE OF CONTENTS




                                                                                               Page
                                                                                               ----
                                                                                         

PART I   FINANCIAL INFORMATION

Item 1.  Condensed Consolidated Financial Statements
         
         Condensed Consolidated Balance Sheets as 
         December 31, 1997 and September 30, 1998                                                3

         Condensed Consolidated Statements of Operation
         for the three and nine months ended September 30, 1997 and
         1998, and for the Period from Inception
         (May 1, 1992) to September 30, 1998                                                     4

         Condensed Consolidated Statements of Cash Flows for the nine
         months ended September 30, 1997 and 1998, and for the Period
         from Inception (May 1, 1992) to September 30, 1998                                      5

         Notes to Condensed Consolidated Financial Statements                                    6

Item 2.  Management's Discussion and Analysis of Financial
         Condition and Results of Operations                                                     8

Item 3.  Quantitative and Qualitative Disclosures about Market Risk                             12
        
PART II  OTHER INFORMATION

Item 2.  Changes in Securities and Use of Proceeds                                              12
        
Item 6.  Exhibits and Reports on Form 8-K                                                       13
        
        
         Signatures                                                                             14




                                       2


PART I            FINANCIAL INFORMATION

ITEM 1.           CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

                         LeukoSite, Inc. and Subsidiary
                          (A Development Stage Company)
                      Condensed Consolidated Balance Sheets



                                                      December 31, 1997       September 30,1998
                                                   ---------------------    ---------------------
                                                                                  (Unaudited)
                                                                      
ASSETS
Current assets:
   Cash and cash equivalents                                $ 10,587,873            $  7,164,249
   Marketable securities                                      14,569,100              19,298,829
   Other current assets                                          408,811                 874,723
                                                            ------------             ------------
     Total current assets                                     25,565,784              27,337,801
                                                            ------------             ------------
Property and equipment, net of accumulated
     depreciation and amortization                             2,439,289               3,032,194
                                                            ------------             ------------
Other assets                                                      27,090                  25,873
                                                            ------------             ------------
Total assets                                                $ 28,032,163            $ 30,395,868
                                                            ------------             ------------
                                                            ------------             ------------

LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
   Accounts payable and accrued expenses                    $  2,063,410            $  3,654,706
   Obligation to fund L&I Joint Venture (Note 4)               1,770,310               1,520,498
   Deferred revenue                                            1,161,250               2,601,231
   Deferred rent, current portion                                243,171                 243,171
   Current portion of capital lease obligations                  866,835                 633,471
                                                            ------------             ------------
     Total current liabilities                                 6,104,976               8,653,077
                                                            ------------             ------------
Deferred rent, net of current portion                            222,907                  40,529
                                                            ------------             ------------
Capital lease obligations, net of current portion                896,578                 724,434
                                                            ------------             ------------
Stockholders' equity:
      Preferred stock $.01 par value-
         Authorized-5,000,000 share
         Issued and outstanding-no shares                           --                      --
      Common stock, $.01 par value-
         Authorized-25,000,000 shares
         Issued and outstanding-9,875,741 shares at
         December 31, 1997 and 11,898,174
         shares at September 30, 1998                             98,758                 118,983
      Additional paid-in capital                              53,294,367              65,239,791
      Deficit accumulated during the development stage       (32,585,423)            (44,380,946)
                                                            ------------             ------------
        Total stockholders' equity                            20,807,702              20,977,828
                                                            ------------             ------------
        Total liabilities and stockholders' equity          $ 28,032,163            $ 30,395,868
                                                            ------------             ------------
                                                            ------------             ------------




                                       3



                         LeukoSite, Inc. and Subsidiary
                          (A Development Stage Company)
                 Condensed Consolidated Statements of Operations
                                   (Unaudited)




                                                                                                                      Inception
                                                                                                                    (May 1, 1992)
                                            Three Months Ended September 30,     Nine Months Ended September 30,      Through
                                              1997             1998             1997            1998             September 30, 1998
                                              ----             ----             ----            ----             ------------------
                                                                                                   
       REVENUES:
       Corporate collaborations             $   1,558,750    $   2,201,920    $   3,628,774    $   6,479,586      $   15,669,037
       Government grants                           50,948          175,233          256,370          590,577           1,250,806
                                            -------------    -------------    -------------    -------------      --------------
       Total revenue                            1,609,698        2,377,153        3,885,144        7,070,163          16,919,843
                                            -------------    -------------    -------------    -------------      --------------

       OPERATING EXPENSES:
       Research and development                 3,053,638        6,057,468        8,505,075       14,997,469          49,167,589
       General and administrative                 371,879          555,454        1,107,441        1,872,147           7,184,229
                                            -------------    -------------    -------------    -------------      --------------
       Total operating expenses                 3,425,517        6,612,922        9,612,516       16,869,616          56,351,818
                                            -------------    -------------    -------------    -------------      --------------

       LOSS FROM OPERATIONS                   ( 1,815,819)      (4,235,769)     ( 5,727,372)      (9,799,453)        (39,431,975)

       OTHER INCOME (EXPENSE):
           Equity in  operations of joint     ( 1,649,400)        (937,351)     ( 1,649,400)      (2,922,256)        ( 6,280,172)
             venture
           Interest income                        235,031          392,941          529,825        1,039,935           2,709,944
           Interest expense                      ( 39,027)        ( 34,241)       ( 122,384)       ( 113,749)          ( 768,743)
                                            -------------    -------------    -------------    -------------      --------------

       NET LOSS                             $  (3,269,215)    $ (4,814,420)    $ (6,969,331)   $ (11,795,523)      $ (43,770,946)
                                            -------------    -------------    -------------    -------------      --------------
                                            -------------    -------------    -------------    -------------      --------------

       NET LOSS PER COMMON SHARE
            Basic and diluted                      $(2.32)           $(.41)          $(6.23)          $(1.12)
                                            -------------    -------------    -------------    -------------       
                                            -------------    -------------    -------------    -------------       
            Pro forma                             $  (.48)                           $(1.12)
                                            -------------                     -------------                        
                                            -------------                     -------------                        

       SHARES USED IN COMPUTING NET LOSS
       PER COMMON SHARE
            Basic and diluted                   1,460,104       11,862,108        1,216,761       10,554,312
                                            -------------    -------------    -------------    -------------       
                                            -------------    -------------    -------------    -------------       
            Pro forma                           6,995,725                         6,752,382
                                            -------------                     -------------    
                                            -------------                     -------------    




                                       4



                         LeukoSite, Inc. and Subsidiary
                          (A Development Stage Company)
                 Condensed Consolidated Statements of Cash Flows
                                   (Unaudited)



                                                                                                            Inception
                                                                      Nine Months Ended                   (May 1, 1992)
                                                                        September 30,                  through September 30,
                                                              ----------------------------------      ----------------------
                                                                   1997               1998                       1998
                                                                   -----              -----                      ----
CASH FLOWS FROM OPERATING ACTIVITIES:
                                                                                                         
Net loss                                                      $   (6,969,331)    $  (11,795,523)       $  (43,770,946)
Adjustments to reconcile net loss to net
 cash used in operating activities:
 Stock compensation expense                                            --                --                    89,339
 Depreciation and amortization                                       884,999           863,304              3,834,620
 Equity in operations of joint venture                             1,649,400         2,922,256              6,280,172
 Change in operating assets and liabilities:
    Other current assets                                            (143,470)         (465,912)              (874,723)
    Accounts payable and accrued expenses                          1,220,762         1,591,296              4,221,408
    Deferred revenue                                               1,575,000         1,439,981              2,601,231
    Deferred rent                                                    (48,314)         (182,378)               283,700
                                                                 ---------------   ---------------      ---------------
     Net cash used in operating activities                        (1,830,954)       (5,626,976)           (27,335,199)
                                                                 ---------------   ---------------      ---------------

CASH FLOWS FROM INVESTING ACTIVITIES:
  Investment in marketable securities                              (10,923,111)      (17,234,631)         (55,298,712)
  Proceeds from maturities of marketable securities                  7,851,382        12,504,902           35,991,438
  Investment in joint venture                                         (652,500)       (3,172,068)          (4,759,674)
  Purchases of property and equipment                                 (432,388)       (1,109,437)          (2,944,225)
  Decrease in other assets                                                 436             1,217              (25,873)
                                                                 ---------------   ---------------      ---------------
      Net cash used in investing activities                         (4,156,181)       (9,010,017)         (27,037,046)
                                                                 ---------------   ---------------      ---------------

CASH FLOWS FROM FINANCING ACTIVITIES:
 Principal payments on capital leases                                 (621,682)         (752,280)          (3,032,441)
 Net proceeds from notes payable                                          --                --              2,086,312
 Proceeds from redeemable convertible preferred stock, 
    net of issuance costs                                            3,819,506              --             23,256,599
 Proceeds from initial public offering, net of issuance                                                    
    costs                                                           15,297,036              --             15,297,020
 Issuance of common stock                                                 --          11,731,366           15,701,366
 Exercise of stock options                                              37,015           234,283              315,763
 Issuance of convertible preferred stock,
    net of issuance costs                                                 --                --              7,911,875
                                                                 ---------------   ---------------      ---------------
     Net cash provided by financing activities                      18,531,875        11,213,369           61,536,494
                                                                 ---------------   ---------------      ---------------



NET INCREASE (DECREASE) IN CASH AND
EQUIVALENTS                                                          12,544,740        (3,423,624)           7,164,249

CASH AND EQUIVALENTS, BEGINNING OF PERIOD                            4,430,507        10,587,873                 --
                                                                 ---------------   ---------------      ---------------

CASH AND EQUIVALENTS, END OF PERIOD                               $ 16,975,247      $  7,164,249          $ 7,164,249
                                                                 ---------------   ---------------      ---------------
                                                                 ---------------   ---------------      ---------------


SUPPLEMENTAL CASH FLOW INFORMATION:
     Cash paid during the period for interest                     $    122,384      $    113,749          $   982,356
                                                                 ---------------   ---------------      ---------------
                                                                 ---------------   ---------------      ---------------


SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND
FINANCING ACTIVITIES:
     Property and equipment purchased under capital
     lease obligations                                            $    298,545      $    346,771          $ 4,164,145
                                                                 ---------------   ---------------      ---------------
                                                                 ---------------   ---------------      ---------------






              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

1.        Operations and Basis of Presentation

    LeukoSite, Inc. (the "Company") was incorporated on May 1, 1992. The Company
    is engaged in the development of immunomodulatory therapeutics with
    potential applications in inflammatory, autoimmune, and viral diseases and
    cancer.

    The accompanying unaudited condensed consolidated financial statements have
    been prepared by the Company pursuant to the rules and regulations of the
    Securities and Exchange Commission and include, in the opinion of
    management, all adjustments, consisting of normal, recurring adjustments,
    necessary for a fair presentation of interim period results. Certain
    information and footnote disclosures normally included in financial
    statements prepared in accordance with generally accepted accounting
    principles have been condensed or omitted pursuant to such rules and
    regulations. The Company believes, however, that its disclosures are
    adequate to make the information presented not misleading. The results for
    the interim periods presented are not necessarily indicative of results to
    be expected for the full fiscal year. These condensed financial statements
    should be read in conjunction with the audited consolidated financial
    statements and notes related thereto included in the Company's Annual Report
    on Form 10-K for the year ended December 31, 1997 filed with the Securities
    and Exchange Commission.

2.   Summary of Significant Accounting Policies

    (a) Cash Equivalents and Marketable Securities

    Cash equivalents are highly liquid investments with original maturities of
    less than three months. Marketable securities consist of securities with
    original maturities of greater than three months. The Company accounts for
    cash equivalents and marketable securities in accordance with Statement of
    Financial Accounting Standards (SFAS) No. 115 "Accounting for Certain
    Investments in Debt and Equity Securities." In accordance with SFAS No. 115,
    the Company has classified its investments as held-to-maturity as the 
    Company has the positive intent and ability to hold such investments to
    maturity. Accordingly, marketable securities are reported at amortized 
    cost, which approximates fair market value.

    As of September 30, 1998 there were no material unrealized gains or losses
    on any investments. Cash and cash equivalents and marketable securities
    consisted of the following:



                                                                    December 31, 1997          September 30, 1998

                                                                                      
                Cash and cash equivalents:
                     Cash                                            $  1,373,786           $   296,491
                     Money market funds                                 6,609,783             5,562,820
                     Corporate notes                                       --                   500,054
                     Taxable auction securities                         2,604,304               804,884
                                                                     ------------          -------------
                                                                     $ 10,587,873           $  7,164,249
                                                                     ------------          -------------
                                                                     ------------          -------------


                Marketable securities:
                     U.S. government agency obligations
                        (average maturity of 5 months)               $  6,094,401           $     --
                     Corporate bonds and notes (average
                        maturity of 5 and 7 months                      8,474,699             19,298,829
                        respectively)                                ------------          -------------
                                                                     $ 14,569,100           $ 19,298,829
                                                                     ------------          -------------
                                                                     ------------          -------------



                                       6


    (b) Net Loss per Common Share

    In March 1997 the Financial Accounting Standards Board issued SFAS No. 128,
    Earnings per Share. The Company adopted SFAS No. 128 effective December 15,
    1997. Basic net loss per common share is computed on the weighted average
    number of common shares outstanding. Diluted net loss per common share is
    the same as basic net loss per common share as the inclusion of stock
    options and warrants would be antidilutive. Pro forma net loss per common
    share assumes the automatic conversion of all outstanding shares of
    redeemable convertible preferred stock and convertible preferred stock into
    common stock using the as-converted method, which occurred upon the closing
    of the Company's initial public offering on August 15, 1997. In addition,
    the net loss available to common stockholders for the three months and the
    nine months ended September 30, 1997 has been adjusted to include $122,000
    and $610,000, respectively, of dividends attributable to redeemable
    convertible preferred stock.

3.  Private Placement

    In July 1998, the Company completed a private placement of 1,967,169 shares
    of its common stock at $6 per share, for net proceeds of $11.7 million 
    after expenses of the offering.

4.  Ilex Agreement

    In May 1997 the Company and Ilex Oncology, Inc. (Ilex) entered into a joint
    venture agreement that established a limited partnership for the purpose of
    developing LDP-03 (CAMPATH-1H). Under the terms of the partnership, the 
    Company is required to fund 50% of the partnership's working capital 
    requirements. The joint venture expires in 2017, but provides for either 
    partner under certain circumstances to purchase the other partner's 
    ownership position of the joint venture after October 2000. Should either 
    party fail to fulfill its funding obligations, control of the joint 
    venture may change.

    The Company accounts for its investment in the joint venture under the
    equity method of accounting and records its share of the income or loss in
    other income (expense). The Company is reimbursed by the joint venture for
    certain costs incurred on behalf of the joint venture. For the nine months
    ended September 30, 1998 the Company's share of the joint venture's recorded
    loss was $2,922,256 and the Company had a funding liability of $1,520,498 to
    the joint venture as of September 30, 1998. The Company charged the joint
    venture $820,503 for costs incurred by the Company on behalf of the joint
    venture.

    The joint venture has entered into an agreement with a third party to
    manufacture LDP-03. In connection with this agreement, the Company and Ilex
    have guaranteed the payment of the obligations of the joint venture due
    under the manufacturing agreement. As of September 30, 1998 the remaining
    obligation was approximately $1.6 million.

5.  MorphoSys

    The Company entered into a two-year collaboration agreement with MorphoSys
    AG (MorphoSys) in August 1998 to discover and develop therapeutic monoclonal
    antibodies for inflammatory and autoimmune disorders. Under the terms of the
    agreement, the Company received exclusive worldwide rights to develop and
    commercialize antibody therapeutics resulting from the collaboration. The
    Company made a technology access fee payment in August 1998 of $750,000. 
    The agreement calls for payments to be made to MorphoSys upon the 
    achievement of certain milestones as well as future royalties based upon 
    commercial sales of products developed under the collaboration.



                                       7



ITEM 2   MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
         AND RESULTS OF OPERATIONS.

The following Management's Discussion and Analysis of Financial Condition and
Results of Operations and this Quarterly Report on Form 10-Q contains certain
forward-looking statements within the meaning of Section 27A of the Securities
Act of 1933 and Section 21E of the Securities and Exchange Act of 1934,
including but not limited, (i) statements about the adequacy of the Company's
capital resources, interest income and revenues from its collaboration
agreements to fund its operating expenses and capital requirements into 2000,
(ii) statements about the amount of capital expenditures that the Company
expects to incur in 1998 and (iii) certain statements identified or qualified by
words such as "anticipate," "plan," "believe," "estimate," "expect" and similar
expressions. Investors are cautioned that forward-looking statements are
inherently uncertain and that the Company's actual results, performance or
achievements could differ materially from the results expressed in, or implied
by, these forward-looking statements. Factors that could cause or contribute to
such differences include those discussed under the caption "Risk Factors" in the
Company's Annual Report on Form 10-K for the fiscal year ended December 31,
1997.

OVERVIEW

The Company is a leader in the discovery and development of products based 
upon the biology of leukocytes. Therapeutics developed using the Company's 
technology may be used to treat inflammatory, autoimmune, and viral diseases 
and cancer. The Company has been funded to date primarily through proceeds 
from the sale of equity securities and funding from collaboration agreements. 
To date, the Company has not received any revenue from the sale of products. 
The Company has experienced operating losses since its inception and expects 
that the activities required to develop and commercialize its products will 
result in further operating losses for the next several years. As of 
September 30, 1998 the Company had an accumulated deficit of approximately 
$44.4 million.

In 1994, 1995 and 1996 the Company signed agreements with Warner-Lambert 
Company for the discovery and development of small molecule antagonists to 
the MCP-1, IL-8, CCR5 and CXCR4 receptors found on certain classes of 
leukocytes. In January 1998 Warner-Lambert Company made a $1 million payment 
related to the achievement of certain milestones associated with the 
Company's CCR5 program. In July 1996 the Company signed an agreement with 
Roche Bioscience for the discovery and development of monoclonal antibodies 
and small molecule antagonists to the CCR3 receptor found on a certain class 
of leukocytes. In April 1997 the Company signed an agreement with Kyowa Hakko 
Kogyo Co., Ltd., for the discovery and development of small molecule 
antagonists to the CXCR3 and CCR1 receptors found on certain classes of 
leukocytes. In May 1997 the Company entered into a joint venture with Ilex 
Oncology, Inc. for the development of LDP-03 (CAMPATH-1H) for the treatment 
of chronic lymphocytic leukemia. In October 1997 the Company, Warner-Lambert 
and Kyowa agreed to jointly pursue research and development of antagonists 
that target MCP-1, IL-8, CCR1 and CXCR3. In December 1997 the Company entered 
into a collaboration agreement with Genentech, Inc. for the development of a 
monoclonal antibody therapeutic intended to be used in the treatment of 
inflammatory bowel disease. In August 1998 the Company entered into a 
collaboration agreement with MorphoSys AG for the discovery and development 
of therapeutic monoclonal antibodies for inflammatory and autoimmune 
disorders.

                                       8


RESULTS OF OPERATIONS

Revenues for the three and nine month periods ended September 30, 1998 and 1997.

For the three months ended September 30, 1998 revenues were $2,377,000 
compared to $1,610,000 for the same period in 1997. The increase of $767,000 
was primarily due to reimbursement by L&I Partners, L.P. for costs incurred 
by the Company on behalf of the joint venture to develop CAMPATH-1H. To a 
lesser extent the increase was a result of greater research funding from the 
corporate collaboration with Warner-Lambert and from Small Business 
Innovation Research ("SBIR") grants.

For the nine months ended September 30, 1998 revenues were $7,070,000
compared to $3,885,000 for the same period in 1997. The increase of
$3,185,000 was primarily due to greater research funding from corporate
collaborations with Kyowa Hakko, reimbursement by L&I Partners, L.P. for 
costs incurred by the Company on behalf of the joint venture to develop 
CAMPATH-1H and the achievement of a milestone payment associated with the 
Company's CCR5 program with Warner-Lambert. To a lesser extent, the increase 
was a result of greater research funding from the corporate collaboration 
with Roche Bioscience and SBIR grants.

Research and development expenses for the three and nine month periods ended
September 30, 1998 and 1997.

For the three months ended September 30, 1998 research and development 
expenses were $6,057,000 compared to $3,054,000 for the same period in 1997. 
The increase of $3,003,000 was primarily due to the manufacture of clinical 
trial material and ongoing clinical trials for the Company's LDP-01 and 
LDP-02 programs and the technology access fee paid to MorphoSys AG, a 
combinatorial biology company based in Munich, Germany. To a lesser extent, 
the increase was the result of increased staffing and consumption of supplies 
associated with the Company's drug discovery programs. The Company expects 
that research and development expenses will increase over the next several 
years as the Company further expands its discovery and development programs.

For the nine months ended September 30, 1998 research and development 
expenses were $14,997,000 compared to $8,505,000 for the same period in 1997. 
The increase of $6,492,000 was primarily due to the manufacture of clinical 
trial material and ongoing clinical trials for the Company's LDP-01 and 
LDP-02 programs, the technology access fee paid to MorphoSys and chemical 
library purchases. To a lesser extent, the increase was the result of 
increased staffing and consumption of supplies associated with the Company's 
drug discovery programs. The Company expects that research and development 
expenses will increase over the next several years as the Company further 
expands its discovery and development programs.

General and administrative expenses for the three and nine month periods ended
September 30, 1998 and 1997.

For the three months ended September 30, 1998 general and administrative 
expenses were $555,000 compared to $372,000 for the same period in 1997. The 
increase of $183,000 was primarily due to an increase in expenses associated 
with operating as a public company. General and administrative expenses will 
likely increase in future periods to support the projected growth of the 
Company.

For the nine months ended September 30, 1998 general and administrative 
expenses were $1,872,000 compared to $1,107,000 for the same period in 1997. 
The increase of $765,000 was primarily due to an increase in expenses 
associated with operating as a public company. General and administrative 
expenses will likely increase in future periods to support the projected 
growth of the Company.

Equity in Operations of Joint Venture for the three and nine month periods ended
September 30, 1998 and 1997.

For the three months ended September 30, 1998 equity in operations of joint 
venture was a loss of $937,000 compared to a loss of $1,649,000 for the same 
period in 1997. The decrease of $712,000 was primarily due to the substantial 
completion of the manufacture of clinical trial material for the Company's 
ongoing pivotal trial of CAMPATH-1H in the second quarter which resulted in a 
corresponding reduction in manufacturing related expenses in the third 
quarter of 1998 when compared to the same period last year. Joint venture 
expenses were primarily related to data analysis, regulatory submissions and 
activities related to an ongoing pivotal clinical trial of CAMPATH-1H.

                                       9


For the nine months ended September 30, 1998 equity in operations of joint 
venture was a loss of $2,922,000 compared to a loss of $1,649,000 for the 
same period in 1997. The increase of $1,273,000 was primarily due to increased 
joint venture activity in 1998 including manufacturing, data analysis, 
regulatory submissions and the conduct of a pivotal clinical study of 
CAMPATH-1H.

Interest income (expense), net for the three and nine month periods ended 
September 30, 1998 and 1997.

For the three months ended September 30, 1998 net interest income was 
$359,000 compared to $196,000 for the same period in 1997. This increase of 
approximately $163,000 was primarily due to an increase in interest income 
resulting from higher average cash balances due to proceeds received from the 
sale of common stock to Genentech completed in December 1997 and from the 
private placement in July 1998.

For the nine months ended September 30, 1998 net interest income was $926,000 
compared to $407,000 for the same period in 1997. This increase of 
approximately $519,000 was primarily due to an increase in interest income 
resulting from higher average cash balances due to proceeds received from 
LeukoSite's initial public offering completed in August 1997, from the sale 
of common stock to Genentech completed in December 1997 and from the private 
placement in July 1998.

Net Loss for the three and nine month periods ended September 30, 1998 and 1997.

For the three months ended September 30, 1998 net loss was $4,814,000 
compared to $3,269,000 for the same period in 1997. The increase in the net 
loss of $1,545,000 and was primarily due to the manufacture of clinical trial 
material and clinical research related to the Company's LDP-01 and LDP-02 
programs. Higher overall expenses were offset in part by increased revenues 
from research collaborations and interest income.

For the nine months ended September 30, 1998 net loss was $11,796,000 
compared to $6,969,000 for the same period in 1997. The increase in the net 
loss of $4,827,000 and was primarily due to the manufacture of clinical trial 
material and clinical research related to the Company's LDP-01 and LDP-02 
programs and CAMPATH-1H development expenses recorded by the joint venture. 
Higher overall expenses were offset in part by increased revenues generated 
from research collaborations and interest income.

LIQUIDITY AND CAPITAL RESOURCES

Since its inception, the Company's operations have been funded primarily 
through proceeds from the sale of equity securities, which have raised 
approximately $64.6 million, and to a lesser extent license fees and 
sponsored research, which have generated approximately $16.5 million, and 
capital lease obligations, which have generated approximately $4.2 million. 
The Company has used cash to fund operating losses of approximately $43.8 
million, the investment of approximately $2.9 million in equipment and 
leasehold improvements and the repayment of approximately $3.0 million of 
capital lease obligations. The Company had no significant commitments as of 
September 30, 1998 for capital expenditures. At September 30, 1998 the 
Company had on hand cash, cash equivalents and marketable securities of 
approximately $26.5 million. In July 1998, the Company completed a private 
placement of 1,967,169 shares of its common stock at $6 per share, for net 
proceeds of $11.7 million after expenses of the offering.

In May 1997 the Company and Ilex entered into a joint venture whereby the 
parties formed a limited partnership to develop CAMPATH-1H for the treatment 
of chronic lymphocytic leukemia and other diseases. The Company and Ilex are 
required to make contributions when the joint venture requires working 
capital. LeukoSite and Ilex will generally share equally in profits from the 
sales of CAMPATH-1H and in research, development, and clinical expenses. The 
capital requirements of the joint venture consist of clinical development 
expenses. For the nine months ended September 30, 1998 the Company provided 
the joint venture with approximately $2.4 million in funding and the Company 
had a funding liability of $1,520,498 to the joint venture as of September 
30, 1998. The Company charged the joint venture $820,503 for costs incurred 
by the Company on behalf of the joint venture.

                                       10




The Company has entered into sponsored research and consulting agreements with
certain hospitals, academic institutions and consultants, requiring periodic
payments by the Company. As of September 30, 1998 aggregate minimum funding
obligations under these agreements, which include certain cancellation
provisions, total approximately $1,451,000, of which approximately $414,000 will
be paid in 1998. The Company also has a remaining total commitment of $750,000
to the Therapeutic Antibody Centre at the University of Oxford in England to
provide funding in semi-annual installments through the year 1999.

The Company believes that its existing capital resources, interest income and
revenue from the collaboration agreements will be sufficient to fund its planned
operating expenses and capital requirements into 2000. However, there can be no
assurance that such funds will be sufficient to meet the Company's operating
expenses and capital requirements during such period. The Company's actual cash
requirements may vary materially from those now planned and will depend upon
numerous factors, including the results of the Company's research and
development and collaboration programs, the timing and results of preclinical
and clinical trials, the timing and costs of obtaining regulatory approvals, the
progress of the milestone and royalty producing activities of the Company's
collaborative partners, the level of resources that the Company commits to the
development of manufacturing, marketing, and sales capabilities, the cost of
filing, prosecuting, defending and enforcing patent claims and other
intellectual property rights, the ability of the Company to maintain existing
and establish new collaboration agreements with other companies, the
technological advances and activities of competitors and other factors.

The Company expects to incur substantial additional expenses, including expenses
related to ongoing research and development activities, expenditures for
preclinical and clinical trials and the expansion of its laboratory and
administrative activities. Therefore, the Company will need to raise substantial
additional capital. The Company intends to seek such additional funding through
public or private financing or collaboration or other arrangements with
collaborative partners. There can be no assurance, however, that additional
financing will be available from any sources or, if available, will be available
on acceptable terms.

Year 2000 Issues

The Company is reviewing its information systems to assess what steps, if 
any, are required to achieve full Year 2000 compliance. The Company relies 
upon microprocessor-based personal computers and commercially available 
applications software. The Company is currently discussing Year 2000 
readiness with its supply and service vendors. The Company intends to 
continue to assess its exposure to Year 2000 noncompliance on the part of any 
of its vendors and there can be no assurance that their systems will be Year 
2000 compliant. The Company does not anticipate that it will incur material 
expenses to make its internal computer software and operating systems Year 
2000 compliant. The Company believes that the Year 2000 issue will not pose 
significant operational problems for the Company's systems. The Company 
currently does not have any contingency plan in the event Year 2000 
compliance cannot be achieved in a timely manner.

                                       11





ITEM 3.       QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

              Not applicable.

PART II  OTHER INFORMATION

ITEM 2.       CHANGES IN SECURITIES AND USE OF PROCEEDS

              (a)   Not applicable.

              (b)   Not applicable.

              (c)   On July 1, 1998, the Company completed a private placement
                    raising an aggregate of $11,803,014 by issuing 1,967,169 
                    shares of Common Stock at a purchase price of $6.00 per 
                    share. The issuance and sale of the shares of Common Stock 
                    was made in reliance upon Rule 506 of Regulation D 
                    promulgated under the Securities Act of 1933, as amended 
                    (the "Securities Act") and upon Section 4(2) of the 
                    Securities Act.

                (d) The Company's Registration Statement on Form S-1 (Reg. No.
                    333-30213) in connection with the Company's initial public
                    offering of Common Stock was declared effective by the
                    Securities and Exchange Commission (the "SEC") on August 14,
                    1997. Such Registration Statement (the "IPO Registration
                    Statement") provided for the registration under the
                    Securities Act of 2,875,000 shares of the Company's
                    Common Stock (including underwriters overallotment).

                    The aggregate initial public offering price for all
                    2,875,000 shares of Common Stock registered under the
                    Securities Act pursuant to the IPO Registration Statement
                    was $17,250,000. The net proceeds to the Company from such
                    issuance and distribution, after deducting the aggregate
                    amount of expenses (including underwriting discounts and
                    commissions) paid by the Company in connection therewith,
                    were $15,297,000.

                    Of such net proceeds, an aggregate of $10,598,000 has been
                    spent through September 30, 1998 for the following uses 
                    and in the following amounts per use: $4,760,000 for the 
                    clinical development of CAMPATH-1H through the Company's 
                    joint venture with Ilex Oncology; $5,838,000 for working 
                    capital. All amounts spent by the Company for such uses, 
                    other than payment of salaries to directors and officers 
                    of the Company, consisted of direct payments to persons or
                    entities, none of which was a director or officer of the
                    Company, holder of 10 percent or more of any class of equity
                    securities of the Company or other affiliate of the Company.
                    The remaining cash balance of such net proceeds, consisting
                    of $4,699,000, is held in cash, cash equivalents, and
                    marketable securities.


                                       12




ITEM 6.           EXHIBITS AND REPORTS ON FORM 8-K

                  (a)      Exhibits

                           10.1     Stock Purchase Agreement dated July 1, 
                                    1998 among the Registrant and the 
                                    purchasers listed on Exhibit A attached 
                                    thereto

                           10.2     Registration Rights Agreement dated 
                                    July 1, 1998 among the Registrant and the 
                                    investors listed on Exhibit A attached 
                                    thereto

                           27       Financial Data Schedule

                  (b)      Reports on Form 8-K.

                           No reports on Form 8-K were filed by the Company
                           during the quarter for which this report is filed.


                                       13








                                   SIGNATURES
         Pursuant to the requirements of the Securities Exchange Act of 1934,
    the registrant has duly caused this report to be signed on its behalf by the
    undersigned, thereunto duly authorized.




                                    LeukoSite, Inc.
                                    (Registrant)





    Dated: November 9, 1998         /s/ Augustine Lawlor
                                    --------------------
                                    Augustine Lawlor
                                    Vice President, Corporate 
                                    Development and Chief Financial Officer
                                    (principal finance and accounting officer)




                                       14