PDCD1 and angioimmunoblastic T-cell lymphoma: A reliable diagnosis of AITL requires a higher degree of suspicion and a large (and multicolor) IHC panel inclusive of immune makers specific to recognize its follicular helper T-cell origins such as CD10, CXCR5, PD1, ICOS, and CXCL13 (77, 79, 81, 82).