Eosinophils express IL-10, which impedes the development of prostate cancer cells in culture22, but eosinophils can be activated by tumor-derived thymic stromal lymphopoietin (TSLP), thereby increasing the expression of IL-4, IL-5, and IL-13 and stimulating the growth of cervical cancer cells23. The gene discussed is IL4; the disease is prostate carcinoma.