 SAN DIEGO and TORONTO, July 20, 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 June 30, 2021, and provide a corporate update on Tuesday, August 3, 2021, after the close of the market. 