CD4 and nasopharyngeal carcinoma: Compared with the HC group, the NPC group had a significantly larger number of MHC II+ T cells (both CD4 and CD8) and MHC II+ NKT cells (both CD4 and CD8; p = 0.0005 [MHC II+ CD4 T], 0.0019 [MHC II+ CD8 T], 0.0214 [MHC II+ CD4 NKT] and 0.0214 [MHC II+ CD8 NKT], Figure 2B).