PTH and diabetes mellitus: In the subgroup analysis of the data of subjects with prostate cancer, we found statistically significant correlations of vitamin D with age (r = 0.12; P < 0.02), BMI (r = −0.13; P = 0.003), diagnosis of diabetes (r = −0.14; P < 0.01), HbA1C (r = −0.16; P = 0.0008, glucose (r = −0.12; P < 0.007), and PTH (r = −0.21; P < 0.0001).