CD274 and adult T-cell leukemia/lymphoma: PD-L1+ ATLL (expressed on tumor cells) have a worse OS compared to PD-L1- ATLL (40% vs 10% at 2 yrs, p=0.0085).PD-L1+ ATLL (on ME cells) have a better OS compared to PD-L1- ATLL (48% vs 20% at 2 yrs, p=0.0029)(maintained in multivariate analysis with Adj p=0.0322 and Adj p=0.0014, respectively)