| Completed | 2 | 64 | US | rigosertib, ON 01910.Na | Onconova Therapeutics, Inc. | Head and Neck Squamous Cell Carcinoma, Anal Squamous Cell Carcinoma, Lung Squamous Cell Carcinoma, Cervical Squamous Cell Carcinoma, Esophageal Squamous Cell Carcinoma, Skin Squamous Cell Carcinoma, Penile Squamous Cell Carcinoma | 03/15 | 04/16 | | |