Tumor PD-L1 score is reported to be positive in 10–50% of DLBCL, 70–100% of PMBCL, 0–10% of CLL, and 7–80% of T-cell NHL.37 The prognostic value of PD-L1 score in NHL is also unclear, with some studies reporting worse OS and some suggesting no difference.37 This evidence concerns the gene CD274 and B-cell chronic lymphocytic leukemia.