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Ultraviolet Radiation Inhibits Mammary Carcinogenesis in an ER-Negative Murine Model by a Mechanism Independent of Vitamin D 3 .
Cancer Prevention Research 2018 July
Three decades ago, the Garlands postulated that vitamin D3 produced in the skin by ultraviolet radiation (UVR)-induced conversion of 7-dehydrocholesterol to pre-D3 has anticancer effects, thus triggering more than 9,500 publications on D3 and cancer. Here, we report that UVR treatment of transgenic mice of the well-established C3(1)/SV40 Tag mammary cancer model significantly inhibits both autochthonous carcinogenesis and allograft tumor growth, but in contrast neither dietary nor topical D3 influences mammary carcinogenesis in this specific mouse model. Furthermore, UVR's inhibitory effects occur irrespective of whether or not the treatment increases circulating D3 in the mice. The inhibitory effect of UVR on autochthonous tumors occurs at or before the stage of ductal carcinoma in situ. Our studies indicate clearly that UVR can exert D3 -independent anticancer effects in C3(1)/SV40 Tag mice. Therefore, supplemental D3 may not mimic all possible beneficial effects of UVR, and uncovering non-D3 -mediated mechanisms of UVR tumor inhibition may lead to novel strategies for cancer prevention. Cancer Prev Res; 11(7); 383-92. ©2018 AACR .
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