 SAN DIEGO and TORONTO, April 26, 2021 GLOBE NEWSWIRE -- Aptose Biosciences Inc. Nasdaq: APTO; TSX: APS, a clinical stage company developing highly differentiated therapeutics that target the underlying mechanisms of cancer, will report financial results for the quarter ended March 31, 2021, and provide a corporate update on Tuesday, May 4, 2021, after the close of the market. 