CD274 and head and neck squamous cell carcinoma: Part B included a dose-expansion cohort for HNSCC, and tested the combination of durvalumab with either danvatirsen (STAT3 inhibitor) or AZD5069 (CXCR2 inhibitor) in PD-L1 pretreated/naïve patients, and as monotherapy with primary-endpoint ORR and disease-control rate (DCR).