 MINNEAPOLIS, June 08, 2021 GLOBE NEWSWIRE -- Panbela Therapeutics, Inc. Nasdaq: PBLA, a clinical stage biopharmaceutical company developing disruptive therapeutics for the treatment of patients with cancer, is set to join the Russell Microcap Index at the conclusion of the 2021 Russell indexes annual reconstitution effective after the US market opens on June 28, according to a preliminary list of additions posted June 4. 