IL1A and head and neck squamous cell carcinoma: Here we test the cytokine IL-1α encapsulated in 20:80 1,6‐bis‐(p‐carboxyphenoxy)‐hexane:sebacic acid (CPH:SA) copolymer-based microparticles (IL-1αMPs) as an adjuvant to RT in a murine syngeneic HNSCC mouse model.