Onconova Therapeutics, Inc. (NASDAQ: ONTX) (“Onconova”), and Trawsfynydd Therapeutics, Inc. (“Trawsfynydd”), a privately-held biotechnology company developing next-generation, best-in-class antivirals for influenza, COVID and other infectious diseases, today announced that the companies have entered into a definitive merger agreement to combine in an all-stock transaction (the “Merger”).