Suppressed cellular immunity in patients with nasopharyngeal carcinoma.

The subsets and functions of lymphocytes were investigated in patients with nasopharyngeal carcinoma (NPC). The patients were divided into two groups comprising tumor-bearing patients and those in remission. There was no difference in the proportion of T cells among tumor-bearing, remission and healthy control groups. The percentages of inducer/helper T cells and natural killer cells were smaller in the tumor-bearing group than in the control group whereas the percentage of suppressor T cells was greater in the tumor-bearing group. Phytohemagglutinin-stimulated blastogenesis was markedly suppressed in the tumor-bearing group. The responsiveness to interleukin-2 of blastogenesis and of natural killer and lymphokine-activated killer activities was lowered in the tumor-bearing group. These parameters in the remission group were intermediate between those of the tumor-bearing and control groups. These results suggest that cellular immunity is suppressed in patients with NPC and that the suppressed condition still remains even in remission. Immunotherapy is considered to be indispensable for the proper treatment of NPC.