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  • Can daily vitamin D...

Can daily vitamin D supplementation reduce cancer mortality?

Written By : Dr. Kamal Kant Kohli Published On 2023-05-11T10:15:17+05:30  |  Updated On 11 May 2023 2:27 PM IST
Pregnancy vitamin D supplementation and offspring bone mineral density
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USA: A recent study published in Ageing Research Reviews has revealed that daily vitamin D administration can reduce cancer mortality by 12% compared to bolus supplementation.

In the main meta-analysis of all randomized controlled trials (RCTs), vitamin D3 did not reduce cancer mortality because the observed risk reduction by 6 % was not statistically significant. However, the subgroup analysis revealed that vitamin D3 administered daily, compared to bolus supplementation, reduced cancer mortality by 12 %.

The findings were from evaluating 14 highest-quality studies conducted at the German Cancer Research Center with almost 105,000 participants.

Vitamin D deficiency is widespread worldwide and is particularly common among cancer patients. Averaged over the year, the vitamin D blood levels of about 15 percent of German adults are below the threshold for a pronounced vitamin D deficiency*. In contrast, in a study of colorectal cancer patients, researchers diagnosed vitamin D3 deficiency in 59 percent of participants, which was also associated with an unfavourable prognosis.

The potential effects of vitamin D supplementation and the development or prognosis of cancer have already been investigated in numerous studies. "Based on current studies, vitamin D3 supplementation probably does not protect against developing cancer, but it could reduce the likelihood of dying from cancer. However, previous studies on cancer mortality have yielded very different results, and we were interested in the reasons for this," said Ben Schöttker, an epidemiologist at the German Cancer Research Center. "By re-evaluating all previous studies on the topic, we wanted to help produce robust results on this issue, which is so relevant to population health.

To investigate the effectiveness of vitamin D3 on cancer mortality in the population and on the survival of cancer patients, Ben Schöttker and colleagues conducted a systematic literature search that identified 14 studies with a total of nearly 105,000 participants. The researchers considered only studies of the highest quality whose participants had been randomly assigned to the vitamin D3 arm or the placebo arm.

When all 14 studies were pooled, no statistically significant results emerged. However, when the studies were divided according to whether vitamin D3 was taken daily in a low dose** or in higher doses administered at longer intervals**, a large difference was seen. In the four studies with the infrequent hogher doses, there was no effect on cancer mortality. In contrast, in the summary of the ten studies with daily dosing, the researchers determined a statistically significant twelve percent reduction in cancer mortality.

"We observed this twelve percent reduction in cancer mortality after untargeted vitamin D3 administration to individuals with and without vitamin D deficiency. Therefore, we can assume that the effect is significantly higher for those who are vitamin D deficient," says Ben Schöttker. He explains the better efficacy of daily doses of vitamin D3 by the more regular bioavailability of the active agent, the hormone 1,25-dihydroxyvitamin D, which is only produced by reactions of vitamin D in the body and can presumably inhibit tumour growth.

A more detailed analysis of the studies with daily intake further revealed that people aged 70 and older benefited most from vitamin D3 therapy. In addition, the effect was most evident when vitamin D intake was started before the cancer diagnosis.

Hermann Brenner, epidemiologist and prevention expert at DKFZ, adds: "This work underlines the great potential of vitamin D3 administration in the prevention of cancer deaths. Regular intake at low doses** is associated with almost negligible risk and very low cost."

Reference:

Sabine Kuznia, Anna Zhu, Taisuke Akutsu, Julie E. Buring, Carlos A. Camargo Jr, Nancy R. Cook, Li-Ju Chen, Ting-Yuan David Cheng, Sari Hantunen, I.-Min Lee, JoAnn E. Manson, Rachel E. Neale, Robert Scragg, Aladdin H. Shadyab, Sha Sha, John Sluyter, Tomi-Pekka Tuomainen, Mitsuyoshi Urashima, Jyrki K. Virtanen, Ari Voutilainen, Jean Wactawski-Wende, Mary Waterhouse, Hermann Brenner, Ben Schöttker, Efficacy of vitamin D3 supplementation on cancer mortality: Systematic review and individual patient data meta-analysis of randomised controlled trials, Ageing Research Reviews, https://doi.org/10.1016/j.arr.2023.101923.

Ageing Research Reviewscancervitamin Dcolorectal cancer
Source : Ageing Research Reviews
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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