To the Editor Scragg et al1 address an issue of major current interest—the role of vitamin D in cancer prevention. We commend the authors for acknowledging several confounding factors in their study that could nullify any association between vitamin D and cancer incidence.1 These factors include the proportion of participants (approximately 25%) with vitamin D deficiency.1
Peiris CD, Jaroudi S, Byrd T. Role of Monthly High-Dose Vitamin D Supplementation in Cancer Prevention. JAMA Oncol. 2019;5(4):572. doi:10.1001/jamaoncol.2018.7214
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