In this study, we performed a comprehensive TFH phenotyping in PTCLs with an extended 7-TFH marker panel by adding CXCR5 and CD134, which we had previously proven to be consistently expressed in the neoplastic T cells of TFHL-AI (formerly angioimmunoblastic T-cell lymphoma) [4]. Here, CXCR5 is linked to angioimmunoblastic T-cell lymphoma.