Barretto, A.M., Schwartz, G.G., Woofruff, R. and Cramer, S.C., 2000. 5-hydroxyvitamin D-3, the prohormone of 1,25-dihydroxyvitamin D-3, inhibits the proliferation of primary prostatic epithelial cells. Cancer Epidemiology Biomarkers & Prevention, 9, 3, 265–270.