Aptose to Report Second Quarter 2021 Financial Results and Hold Conference Call on Tuesday, August 3, 2021

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.

Conference Call & Webcast:

Date:                          Time:              Dial In - Toll-Free:   Dial In - International:              Conference ID:             Webcast:

Tuesday, August 3, 2021   5:00 PM ET 1 844-882-7834 1 574-990-9707 7272387 https://edge.media-server.com/mmc/p/7gwifpdt

The live conference call can also be accessed through a link on the Investor Relations section of Aptose’s website at https://www.aptose.com/investors/news-events/ir-calendar. An archived version of the webcast along with a transcript will be available on the company’s website for 30 days.

The press release, the financial statements and the management’s discussion and analysis for the year and quarter ended June 30, 2021 will be available on SEDAR at www.sedar.com and EDGAR at www.sec.gov/edgar.shtml.

About Aptose

Aptose Biosciences is a clinical-stage biotechnology company committed to developing personalized therapies addressing unmet medical needs in oncology, with an initial focus on hematology. The Company's small molecule cancer therapeutics pipeline includes products designed to provide single agent efficacy and to enhance the efficacy of other anti-cancer therapies and regimens without overlapping toxicities. The Company has two clinical- stage investigational products for hematologic malignancies: luxeptinib (formerly CG-806), an oral, first-in-class mutation-agnostic FLT3/BTK kinase inhibitor, is in a Phase 1a/b trial in patients with relapsed or refractory B cell malignancies, including chronic lymphocytic leukemia (CLL), small lymphocytic lymphoma (SLL) and non-Hodgkin lymphoma (NHL), who have failed or are intolerant to standard therapies, and is in a separate Phase 1a/b trial in patients with relapsed or refractory acute myeloid leukemia (AML); APTO-253, the only clinical-stage agent that directly targets the MYC oncogene and suppresses its expression, is in a Phase 1a/b clinical trial for the treatment of patients with relapsed or refractory AML or high risk myelodysplastic syndrome (MDS).

For further information, please contact:

Aptose Biosciences Inc.                                          
Susan Pietropaolo                                                                                    
Corporate Communications & Investor Relations                         
201-923-2049                                                                
spietropaolo@aptose.com

LifeSci Advisors, LLC
Dan Ferry, Managing Director
617-535-7746
Daniel@LifeSciAdvisors.com