 NEW YORK, May 11, 2021 GLOBE NEWSWIRE -- SELLAS Life Sciences Group, Inc. Nasdaq: SLS SELLAS or the Company, a late-stage clinical biopharmaceutical company focused on developing novel cancer immunotherapies for a broad range of indications, today announced that it will host a Shareholder Update Call on Thursday, June 3, 2021 at 8:30 a.m. ET. 