13G Filing: Armistice Capital and Onconova Therapeutics Inc. (ONTX)

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Page 9 of 9 – SEC Filing

Exhibit A

AGREEMENT

The undersigned
agree that this Schedule 13G dated February 20, 2018 relating to the Common Stock, par value $0.01 per share, of Onconova Therapeutics,
Inc. shall be filed on behalf of the undersigned.

Armistice Capital, LLC
By:  /s/ Steven Boyd
Steven Boyd
Managing Member
Armistice Capital Master Fund Ltd.
By:  /s/ Steven Boyd
Steven Boyd
Director
/s/ Steven Boyd
Steven Boyd

SK
27622 0002 7819738

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