 DURHAM, NC ACCESSWIRE June 18, 2020 Heat Biologics, Inc. Heat HTBX, a clinical-stage biopharmaceutical company focused on developing first-in-class therapies to modulate the immune system, including multiple oncology product candidates and a novel COVID-19 vaccine, today announced initiation of the first clinical trial site for PTX-35. Anthony Tolcher, M.D., FRCPC, a medical oncologist and co-founder of NEXT Oncology, has been appointed the lead investigator for the Phase 1 clinical trial. 