 DURHAM, N.C., Aug. 23, 2021 GLOBE NEWSWIRE -- Heat Biologics, Inc. Heat NASDAQ: HTBX, a clinical-stage biopharmaceutical company focused on developing first-in-class therapies to modulate the immune system, announces the addition of Mark Pryor, former US Senator from the State of Arkansas, to the Companys Biothreat Advisory Board. 