PDCD1 and diffuse large B-cell lymphoma: Although there were some unmatched findings because of a variety of immunohistochemistry stains and cut-off values of PD-1/PD-L1 positivity, numerous studies have showed that a high number of PD-1+ TILs in DLBCL is associated with favorable clinical features and prognosis (Table 1) [43,49,50,51].