X0206 3 2020-05-27 1 0001130598 Onconova Therapeutics, Inc. ONTX 0001813552 Shoemaker Mary Teresa C/O ONCONOVA THERAPEUTICS, INC 375 PHEASANT RUN NEWTOWN PA 18940 1 0 0 0 Exhibit 24 attached /s/ Mark Guerin as attorney-in-fact 2020-06-08