CD274 and neoplasm: Similarly, in a phase 1a study of atezolizumab in 115 patients with heavily pretreated TNBC, of whom 71 were PD-L1+ (based on ≥ 5% of tumor-infiltrating immune cells [IHC score of 2/3 using the SP142 assay]) and were considered evaluable for efficacy, the unconfirmed ORR was 13% [19].