“Low levels of vitamin D were recorded among patients with breast cancer compared with healthy controls. Moreover, low vitamin D levels were common at breast cancer diagnosis and were associated with a poor prognosis; about 94% women with vitamin D level less than 20 ng/mL develop metastases and 73% die of the advanced disease.”

“….retrospective and prospective epidemiologic studies revealed that vitamin D deficiency is associated with increased breast cancer risk.”

M.Atoum, F.Alzoughool
Vitamin D and Breast Cancer: Latest Evidence and Future Steps
Breast Cancer: Basic And Clinical Research – December 20, 2017


“…..vitamin D deficiency may account for several thousand premature deaths from colon, breast, ovarian, and prostate cancer annually.”

C.F.Garland, et al
The Role of Vitamin D in Cancer Prevention
American Journal Of Public Health – Volume 96 #2 – February 2006 – page 252

“….a new study correlates breast cancer survival rates with levels of vitamin D “
“Some studies have suggested that the active metabolite of vitamin D – known as calcitriol – may be anticancerous. Administering calcitriol in mice has been shown to stop the proliferation and growth of cancer cells, reduce tumor blood vessel formation, and stimulate cell death……..some clinical and preclinical studies indicate that avoiding vitamin D deficiency and taking vitamin D supplements might be a cost-effective and safe way to prevent cancer and improve prognosis in patients already diagnosed with the illness.”

“A new study led by Dr. Song Yao, from the Roswell Park Cancer Institute in Buffalo in New York, analyzed data from 1,666 women diagnosed with breast cancer…….The average age of the patients monitored was 58.7 years. Overall, half of the patients were vitamin D deficient……”

“Researchers found a lower level of the vitamin D biomarker in women with advanced-stage tumors.”

Lower levels of 25OHD were associated with higher tumor stage and grade, and women with the highest levels of 25OHD had higher survival rates overall. Levels of 25OHD also increased proportionally with vitamin D dietary and supplemental intake.”

“Our findings provide compelling observational evidence for inverse associations between vitamin D levels and risk of breast cancer progression and death….”

“The lowest levels were found in premenopausal women with triple-negative cancer. Triple-negative breast cancer is a type of cancer that tests negative for estrogen receptors, progesterone receptors, and HER2 protein.”

Vitamin D may increase survival for breast cancer patients
Medical News Today – Thursday November 10, 2016