Onconova Therapeutics, Inc. announced that Jack E. Stover has been appointed to its Board of Directors. Currently, Mr. Stover serves as Interim President, CEO and Director of Interpace Diagnostics Group Inc. Prior to his tenure at Interpace Diagnostics Group he served from August 2005 until December 2015 as Director, Member of the Special Executive Committee and Chairman of the Audit Committee of PDI Inc.