Effect of Vitamin D and Calcium Supplementation on Cancer Incidence in Older Women: A Randomized Clinical Trial

JAMA. 2017 Mar 28;317(12):1234-1243. doi: 10.1001/jama.2017.2115.

Abstract

Importance: Evidence suggests that low vitamin D status may increase the risk of cancer.

Objective: To determine if dietary supplementation with vitamin D3 and calcium reduces the risk of cancer among older women.

Design, setting, and participants: A 4-year, double-blind, placebo-controlled, population-based randomized clinical trial in 31 rural counties (June 24, 2009, to August 26, 2015-the final date of follow-up). A total of 2303 healthy postmenopausal women 55 years or older were randomized, 1156 to the treatment group and 1147 to the placebo group. Duration of treatment was 4 years.

Interventions: The treatment group (vitamin D3 + calcium group) received 2000 IU/d of vitamin D3 and 1500 mg/d of calcium; the placebo group received identical placebos.

Main outcomes and measures: The primary outcome was the incidence of all-type cancer (excluding nonmelanoma skin cancers), which was evaluated using Kaplan-Meier survival analysis and proportional hazards modeling.

Results: Among 2303 randomized women (mean age, 65.2 years [SD, 7.0]; mean baseline serum 25-hydroxyvitamin D level, 32.8 ng/mL [SD, 10.5]), 2064 (90%) completed the study. At year 1, serum 25-hydroxyvitamin D levels were 43.9 ng/mL in the vitamin D3 + calcium group and 31.6 ng/mL in the placebo group. A new diagnosis of cancer was confirmed in 109 participants, 45 (3.89%) in the vitamin D3 + calcium group and 64 (5.58%) in the placebo group (difference, 1.69% [95% CI, -0.06% to 3.46%]; P = .06). Kaplan-Meier incidence over 4 years was 0.042 (95% CI, 0.032 to 0.056) in the vitamin D3 + calcium group and 0.060 (95% CI, 0.048 to 0.076) in the placebo group; P = .06. In unadjusted Cox proportional hazards regression, the hazard ratio was 0.70 (95% CI, 0.47 to 1.02). Adverse events potentially related to the study included renal calculi (16 participants in the vitamin D3 + calcium group and 10 in the placebo group), and elevated serum calcium levels (6 in the vitamin D3 + calcium group and 2 in the placebo group).

Conclusions and relevance: Among healthy postmenopausal older women with a mean baseline serum 25-hydroxyvitamin D level of 32.8 ng/mL, supplementation with vitamin D3 and calcium compared with placebo did not result in a significantly lower risk of all-type cancer at 4 years. Further research is necessary to assess the possible role of vitamin D in cancer prevention.

Trial registration: clinicaltrials.gov Identifier: NCT01052051.

Publication types

  • Multicenter Study
  • Randomized Controlled Trial
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Calcium / administration & dosage*
  • Calcium / adverse effects
  • Cholecalciferol / administration & dosage*
  • Cholecalciferol / adverse effects
  • Double-Blind Method
  • Female
  • Humans
  • Hypercalcemia / chemically induced
  • Incidence
  • Intention to Treat Analysis
  • Kaplan-Meier Estimate
  • Kidney Calculi / chemically induced
  • Middle Aged
  • Nebraska / epidemiology
  • Neoplasms / epidemiology*
  • Osteoporosis, Postmenopausal / prevention & control
  • Proportional Hazards Models
  • Sample Size
  • Time Factors
  • Vitamin D / analogs & derivatives
  • Vitamin D / blood
  • Vitamins / administration & dosage*
  • Vitamins / adverse effects

Substances

  • Vitamins
  • Vitamin D
  • Cholecalciferol
  • 25-hydroxyvitamin D
  • Calcium

Associated data

  • ClinicalTrials.gov/NCT01052051
  • ClinicalTrials.gov/NCT01052051