Testosterone proxy In the study on the correlation of high levels of serum calcium with fatal prostate cancer (“Cancer-calcium connection,” SN: 9/27/08, p. 12), were testosterone and vitamin D levels also measured simultaneously? Since low levels of both are related to osteoporosis in men, and testosterone is known to be a fuel of cancer, wasn’t perhaps calcium just a proxy for testosterone? Edward Kausel, Cambridge, Mass.
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