This from the Business Standard:
Breast cancer patients with high levels of vitamin D in their blood are twice as likely to survive the disease as women with low levels of this nutrient, scientists have found.
In previous studies, Cedric F Garland, professor in the Department of Family and Preventive Medicine at the University of California – San Diego, showed that low vitamin D levels were linked to a high risk of premenopausal breast cancer.
The findings, he said, prompted him to question the relationship between 25-hydroxyvitamin D – a metabolite produced by the body from the ingestion of vitamin D – and breast cancer survival rates.
Garland and colleagues performed a statistical analysis of five studies of 25-hydroxyvitamin D obtained at the time of patient diagnosis and their follow-up for an average of nine years. Combined, the studies included 4,443 breast cancer patients.
“Vitamin D metabolites increase communication between cells by switching on a protein that blocks aggressive cell division,” said Garland.
“As long as vitamin D receptors are present tumour growth is prevented and kept from expanding its blood supply. Vitamin D receptors are not lost until a tumour is very advanced. This is the reason for better survival in patients whose vitamin D blood levels are high,” Garland said.
Women in the high serum group had an average level of 30 nanograms per millilitre (ng/ml) of 25-hydroxyvitamin D in their blood. The low group averaged 17 ng/ml. The average level in patients with breast cancer in the US is 17 ng/ml.
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Listen to this week’s Ian Wishart radio show on Vitamin D