MS4A1 and nasopharyngeal carcinoma: Tissues of a total of 217 patients with NPC (69 female patients and 148 male patients; median age of 48 years, interquartile range 38–56 years) were included in the immunohistochemistry analysis to detect CD20+ B-cell density (Representative B cell IHC staining images are shown in Fig.S1A-D).