Satou et al. described the lack of PD-L1 expression on tumor cells in seven cases with MTX-associated EBVMCU using two different clones (SP142 and E1J2J) [59], which is consistent with findings reported by Daroontum et al. in 13 cases of EBVMCU associated with treated lymphoma or MTX [60]. Here, CD274 is linked to neoplasm.