Low levels of vitamin D in men can predict aggressive prostate cancer identified at the time of surgery new research has found. The finding is important because it can offer guidance to men and their doctors who may be considering active surveillance in which they monitor the cancer rather than remove the prostate. Vitamin D deficiency may predict aggressive prostate cancer as a biomarker said lead investigator Adam Murphy assistant professor of urology at Northwestern University Feinberg School of Medicine in Chicago US. (Read: These 5 superfoods can keep you safe from prostate cancer) Previous studies showing an association between