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Comment & Response
July 18, 2017

Vitamin D Supplementation and Cancer Risk

Author Affiliations
  • 1Creighton University Schools of Nursing and Medicine, Omaha, Nebraska
  • 2Department of Family Medicine and Public Health, University of California, San Diego
JAMA. 2017;318(3):299-300. doi:10.1001/jama.2017.7857

In Reply Ms Jaroudi and Dr Peiris suggest that the length of follow-up in our study may have been insufficient to detect a change in cancer incidence. We agree that longer follow-up would have been desirable, but we were limited by funding. However, mechanisms proposed for potential anticancer effects include signaling that may result in short-term effects.1,2