TGFB1 and breast carcinoma: In vivo, we detected clearly elevated TGF‐β1 levels in both irradiated 4T1 tumor tissue and the plasma of BALB/c mouse bearing irradiated 4T1 mammary carcinoma (Figure 3d,e) while slightly increased TGF‐β1 levels in irradiated CT26, H22, and GL261 tumor tissues (Figure S2c, Supporting Information).