CD274 and B-cell chronic lymphocytic leukemia: Ramsay and Gamaleldin et al. indicated that PDL1 expression was associated with poor prognosis in chronic lymphocytic leukemia (CLL)/small lymphocytic lymphoma (SLL), and was associated with failure of complete remission, shorter progression-free survival, and shorter overall survival in CLL [28], but Menter and Zhang et al. showed that PDL1 expression in CLL/SLL had no prognostic significance in most studies [25,42].