A 4-wk treatment with calcipotriol starting when the tumors became palpable (∼5 mm in diameter) led to significant suppression of PyMtOvatg TslprKO breast cancer growth in TslprKO recipient mice that received WT compared with TslprKO CD4+ T cell transfer (P = 0.0067; Fig. 7, D and E). This evidence concerns the gene CD4 and breast cancer.