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Open AccessArticle

Determinants of Plasma 25-Hydroxyvitamin D Concentrations among Breast Cancer Survivors in Korea

1
Research Institute of Human Ecology, Seoul National University, Seoul 08826, Korea
2
Department of Surgery, Soonchunhyang University Bucheon Hospital, Bucheon 14584, Korea
3
Department of Surgery, Chonbuk National University Medical School, Jeonju 54907, Korea
4
Breast Endocrine Division, Department of Surgery, Keimyung University School of Medicine, Daegu 41941, Korea
5
Department of Food and Nutrition, Seoul National University, Seoul 08826, Korea
*
Author to whom correspondence should be addressed.
Nutrients 2018, 10(3), 380; https://doi.org/10.3390/nu10030380
Received: 26 January 2018 / Revised: 7 March 2018 / Accepted: 16 March 2018 / Published: 20 March 2018
We identified demographic, lifestyle, and clinical factors associated with vitamin D status among breast cancer survivors. The vitamin D prediction model may be a useful surrogate of circulating 25-hydroxvitamin D (25(OH)D) concentrations when this measure was not available. We included a total of 216 Korean breast cancer survivors aged 21–79 years who had been diagnosed with stage I to III primary breast cancer and had breast cancer surgery at least 6 months before enrolment. We used linear and logistic regressions to identify determinants for the plasma 25(OH)D concentrations and vitamin D insufficiency (plasma 25(OH)D concentration < 50 nmol/L). We observed that 48.85% of breast cancer survivors had a plasma 25(OH)D concentration less than 50 nmol/L. We identified the following determinants for plasma 25(OH)D concentrations: time since diagnosis (β = −0.005 for 1 month increment), supplementary vitamin D intake (β = 0.06 for 10 μg/day increment), season of the blood draw (β = 0.35 for summer; β = 0.32 for fall; β = 0.26 for winter vs. spring), smoking status (β = 0.28 for former vs. never), use of any supplement (β = −0.35 for non-use vs. use), and the parity number (β = −0.30 for three or more vs. one) were associated with the plasma 25(OH)D concentrations. In addition to the aforementioned variables, body mass index (BMI) was associated with the prevalence of vitamin D insufficiency. We identified the determinants for the plasma 25(OH)D concentrations among Korean breast cancer survivors. Future studies are needed to investigate the role of vitamin D in the progression of breast cancer among Korean breast cancer survivors. View Full-Text
Keywords: vitamin D; 25-hydroxyvitamin D; vitamin D insufficiency; breast cancer survivors vitamin D; 25-hydroxyvitamin D; vitamin D insufficiency; breast cancer survivors
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Shin, W.-K.; Kim, Z.; Youn, H.J.; Cho, J.; Lee, J.E. Determinants of Plasma 25-Hydroxyvitamin D Concentrations among Breast Cancer Survivors in Korea. Nutrients 2018, 10, 380.

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