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Vitamin D, NSAIDS provide double whammy against prostate cancer, Stanford study finds

SAIDs, ibuprofen and naproxen, so that the controversy over selective NSAIDs wouldn't cast a shadow over their work.

The group saw a 25 percent reduction in prostate cell growth using only calcitriol, and approximately the same reduction using only ibuprofen and naproxen. But when they combined calcitriol and an NSAID, they saw up to a 70 percent reduction. This result was obtained using from one-half to one-tenth the concentration required for either of the drugs used alone.

The group's findings are the basis of a new clinical trial Feldman has begun with oncologist Sandy Srinivas, MD, assistant professor of medicine. Men who have been treated for prostate cancer, but who are experiencing a recurrence, take naproxen twice a day combined with a high, once-weekly dose of calcitriol. Weekly administration of calcitriol avoids a pitfall of earlier studies that used daily dosing: too much calcium in the blood, a condition called hypercalcemia, which can lead to kidney stones.

Feldman's group uses calcitriol for both the cell culture studies and the clinical trial to ensure that enough of the active form of vitamin D is in the patients to be effective. Feldman emphasized that calcitriol is available by prescription only. "We don't want the patient to think that if they take over-the-counter vitamin D, it will work in the same way," he said.


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Contact: Mitzi Baker
mabaker@stanford.edu
650-725-2106
Stanford University Medical Center
1-Sep-2005


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