Against solid tumor regression

Depending on the site of maturation, specific surface markers, and functions, the lymphocytes are divided into T (thymus), B (bone marrow or bursa), NK, and LAK cells. T lymphocytes mature in the thymus and are involved in DTH and in anticancer and antifungal immunity. T helper (Th) and T suppressor (Ts) cells play a central role in immune regulation. The NK cells provide spontaneous and nonspecific immunity against tumor cells, virally infected, and chemically modified cells. The LAK cells are the primary blood or spleen lymphocytes that acquire the ability to kill certain tumors in vitro, when cultured with interleukin (IL)-2. They have been reported to cause regression of solid tumors when administered to experimental animals or patients with cancer and suppress the formation of metastases. 

---