EXHIBIT 99.1
JOINT FILING AGREEMENT
The undersigned hereby agree that the statement on Schedule 13D with respect to the Common Stock, $0.01 par value, of Onconova Thereapeutics, Inc. dated as of the date hereof is, and any further amendments thereto signed by each of the undersigned shall be, filed on behalf of each of the undersigned pursuant to and in accordance with the provisions of Rule 13d-1(f) under the Securities Exchange Act of 1934, as amended.
| | 683 CAPITAL PARTNERS, LP |
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| | By: | 683 CAPITAL GP, LLC as General Partner |
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| | By: | /s/ Ari Zweiman |
| | | Name: | Ari Zweiman |
| | | Title: | Managing Member |
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| | 683 CAPITAL MANAGEMENT, LLC |
| | | |
| | | |
| | By: | /s/ Ari Zweiman |
| | | Name: | Ari Zweiman |
| | | Title: | Managing Member |
| | /s/ Ari Zweiman |
| | ARI ZWEIMAN |
