Volume 101, Issue 5 pp. 1234-1240
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Association between vitamin D and calcium intake and breast cancer risk according to menopausal status and receptor status in Japan

Takakazu Kawase

Takakazu Kawase

Division of Epidemiology and Prevention, Aichi Cancer Center Research Institute, Nagoya

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Keitaro Matsuo

Corresponding Author

Keitaro Matsuo

Division of Epidemiology and Prevention, Aichi Cancer Center Research Institute, Nagoya

Department of Epidemiology, Nagoya University Graduate School of Medicine, Nagoya

To whom correspondence should be addressed.
E-mail: [email protected]Search for more papers by this author
Takeshi Suzuki

Takeshi Suzuki

Department of Medical Oncology and Immunology, Nagoya City University Graduate School of Medical Sciences, Nagoya

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Kaoru Hirose

Kaoru Hirose

Division of Epidemiology and Prevention, Aichi Cancer Center Research Institute, Nagoya

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Satoyo Hosono

Satoyo Hosono

Division of Epidemiology and Prevention, Aichi Cancer Center Research Institute, Nagoya

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Miki Watanabe

Miki Watanabe

Division of Epidemiology and Prevention, Aichi Cancer Center Research Institute, Nagoya

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Masaki Inagaki

Masaki Inagaki

Division of Biochemistry, Aichi Cancer Center Research Institute, Nagoya

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Hiroji Iwata

Hiroji Iwata

Department of Breast Oncology, Aichi Cancer Center Hospital, Nagoya, Japan

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Hideo Tanaka

Hideo Tanaka

Division of Epidemiology and Prevention, Aichi Cancer Center Research Institute, Nagoya

Department of Epidemiology, Nagoya University Graduate School of Medicine, Nagoya

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Kazuo Tajima

Kazuo Tajima

Division of Epidemiology and Prevention, Aichi Cancer Center Research Institute, Nagoya

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First published: 19 April 2010
Citations: 36

Abstract

Although several studies have investigated the possible association between elevated vitamin D and calcium intake and low breast cancer risk, findings have been inconsistent. We conducted a case-control study to clarify the association between vitamin D and calcium intake and breast cancer risk among pre- and post- menopausal women in Japan. We also investigated whether these effects were modified by tumor receptor status, specifically estrogen receptor (ER), progesterone receptor (PR), or human epidermal growth factor receptor-2 (HER2) status. We examined 1803 breast cancer patients and 3606 age- and menopausal status-matched noncancer controls. Among cases, 713 were assessed for ER, PR, and HER2 status. Odds ratios (ORs) with 95% confidence intervals (CIs) were estimated using conditional or unconditional logistic models adjusted for potential confounders. A significant inverse association was observed between vitamin D and calcium intake and breast cancer risk among all subjects, with top quartile ORs of 0.76 (95% CI, 0.63–0.90; trend P = 0.001) and 0.83 (95% CI, 0.69–0.99; trend P = 0.038), respectively. In analyses stratified by menopausal status, a significant association between risk and vitamin D was observed only among premenopausal women (trend P < 0.001), whereas that between risk and calcium intake was seen only among postmenopausal women (trend P = 0.022). Heterogeneity by menopausal status for these associations was statistically significant. This association was modified by tumor receptor status. These findings suggest that the protective effects of vitamin D and calcium intake against breast cancer risk may differ by menopausal status and receptor status.

(Cancer Sci 2010; 101: 1234–1240)

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