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TB not treated by average daily 10,000 IU of vitamin D (previous RCTs disagree) – RCT Sept 2017

High-Dose Vitamin D3 during Tuberculosis Treatment in Mongolia. A Randomized Controlled Trial

American Journal of Respiratory and Critical Care Medicine https://doi.org/10.1164/rccm.201705-0936OC PubMed: 28692301

Davaasambuu Ganmaa , Baatar Munkhzul , Wafaie Fawzi , Donna Spiegelman , Walter C. Willett , Purev Bayasgalan , Erkhembayar Baasansuren , Burneebaatar Buyankhishig , Sereeter Oyun-Erdene , David A. Jolliffe , Theodoros Xenakis , . . .
Correspondence and requests for reprints should be addressed to Davaasambuu Ganmaa, M.D., Ph.D., The Department of Nutrition, Harvard T.H. Chan School of Public Health, Building 2, Room 211, 655 Huntington Avenue, Boston, MA 02115. E-mail: gdavaasa at hsph.harvard.edu

Rationale: Existing trials of adjunctive vitamin D in the treatment of pulmonary tuberculosis (PTB) are variously limited by small sample sizes, inadequate dosing regimens, and high baseline vitamin D status among participants. Comprehensive analyses of the effects of genetic variation in the vitamin D pathway on response to vitamin D supplementation are lacking.

Objectives: To determine the effect of high-dose vitamin D3 on response to antimicrobial therapy for PTB and to evaluate the influence of single-nucleotide polymorphisms (SNPs) in vitamin D pathway genes on response to adjunctive vitamin D3.

Methods: We conducted a clinical trial in 390 adults with PTB in Ulaanbaatar, Mongolia, who were randomized to receive four biweekly doses of 3.5 mg (140,000 IU) vitamin D3 (n = 190) or placebo (n = 200) during intensive-phase antituberculosis treatment.

Measurements and Main Results: The intervention elevated 8-week serum 25-hydroxyvitamin D concentrations (154.5 nmol/L vs. 15.2 nmol/L in active vs. placebo arms, respectively; 95% confidence interval for difference, 125.9–154.7 nmol/L; P < 0.001) but did not influence time to sputum culture conversion overall (adjusted hazard ratio, 1.09; 95% confidence interval, 0.86–1.36; P = 0.48). Adjunctive vitamin D3 accelerated sputum culture conversion in patients with one or more minor alleles for SNPs in genes encoding the vitamin D receptor (rs4334089, rs11568820) and 25-hydroxyvitamin D 1α-hydroxylase (CYP27B1: rs4646536) (adjusted hazard ratio ≥ 1.47; P for interaction ≤ 0.02).

Conclusions: Vitamin D3 did not influence time to sputum culture conversion in the study population overall. Effects of the intervention were modified by SNPs in VDR and CYP27B1.

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