As shown in Fig. 4a, three cell populations, referred to as P1, P2, and P3, were identified in mouse NPC after the FCM analysis of the cells that had been stained with the CD146 and the CD45 marker, and FcγRIIB expression was then analyzed in all fractions (Fig. 4b). This evidence concerns the gene FCGR2B and nasopharyngeal carcinoma.