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Reproductive factors, exogenous female hormone use and breast cancer risk in Japanese: the Miyagi Cohort Study.
Cancer Causes Control 2010; 21(1):135-45CC

Abstract

The incidence of breast cancer among Japanese women is substantially increasing. This population-based prospective cohort study in Japan evaluated the associations of reproductive factors and exogenous female hormone use with breast cancer risk, both overall and separately among premenopausal and postmenopausal women. A total of 24,064 women aged 40-64 were followed from 1990 to 2003. During 309,424 person-years of follow-up, 285 breast cancer cases were documented. In overall evaluation, nulliparity was significantly associated with an increased risk of breast cancer. There was a significant decrease in risk with increasing parity number among parous women (trend P = 0.008). No association was observed between age at menarche or age at first birth and breast cancer risk. Neither oral contraceptive (OC) use nor the use of exogenous female hormones other than OC was associated with breast cancer risk. The evaluation according to menopausal status revealed that nulliparity and parity number were significantly related to breast cancer risk only among postmenopausal women. Later age at natural menopause was associated with an increased risk of breast cancer among postmenopausal women (trend P = 0.02). Our findings suggest that parity number and age at menopause have great effects on breast cancer risk among Japanese women.

Authors+Show Affiliations

Division of Surgical Oncology, Graduate School of Medicine, Tohoku University, Sendai, Miyagi, 980-8574, Japan.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19816778

Citation

Kawai, Masaaki, et al. "Reproductive Factors, Exogenous Female Hormone Use and Breast Cancer Risk in Japanese: the Miyagi Cohort Study." Cancer Causes & Control : CCC, vol. 21, no. 1, 2010, pp. 135-45.
Kawai M, Minami Y, Kuriyama S, et al. Reproductive factors, exogenous female hormone use and breast cancer risk in Japanese: the Miyagi Cohort Study. Cancer Causes Control. 2010;21(1):135-45.
Kawai, M., Minami, Y., Kuriyama, S., Kakizaki, M., Kakugawa, Y., Nishino, Y., ... Ohuchi, N. (2010). Reproductive factors, exogenous female hormone use and breast cancer risk in Japanese: the Miyagi Cohort Study. Cancer Causes & Control : CCC, 21(1), pp. 135-45. doi:10.1007/s10552-009-9443-7.
Kawai M, et al. Reproductive Factors, Exogenous Female Hormone Use and Breast Cancer Risk in Japanese: the Miyagi Cohort Study. Cancer Causes Control. 2010;21(1):135-45. PubMed PMID: 19816778.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Reproductive factors, exogenous female hormone use and breast cancer risk in Japanese: the Miyagi Cohort Study. AU - Kawai,Masaaki, AU - Minami,Yuko, AU - Kuriyama,Shinichi, AU - Kakizaki,Masako, AU - Kakugawa,Yoichiro, AU - Nishino,Yoshikazu, AU - Ishida,Takanori, AU - Fukao,Akira, AU - Tsuji,Ichiro, AU - Ohuchi,Noriaki, Y1 - 2009/10/09/ PY - 2009/07/23/received PY - 2009/09/25/accepted PY - 2009/10/10/entrez PY - 2009/10/10/pubmed PY - 2010/5/14/medline SP - 135 EP - 45 JF - Cancer causes & control : CCC JO - Cancer Causes Control VL - 21 IS - 1 N2 - The incidence of breast cancer among Japanese women is substantially increasing. This population-based prospective cohort study in Japan evaluated the associations of reproductive factors and exogenous female hormone use with breast cancer risk, both overall and separately among premenopausal and postmenopausal women. A total of 24,064 women aged 40-64 were followed from 1990 to 2003. During 309,424 person-years of follow-up, 285 breast cancer cases were documented. In overall evaluation, nulliparity was significantly associated with an increased risk of breast cancer. There was a significant decrease in risk with increasing parity number among parous women (trend P = 0.008). No association was observed between age at menarche or age at first birth and breast cancer risk. Neither oral contraceptive (OC) use nor the use of exogenous female hormones other than OC was associated with breast cancer risk. The evaluation according to menopausal status revealed that nulliparity and parity number were significantly related to breast cancer risk only among postmenopausal women. Later age at natural menopause was associated with an increased risk of breast cancer among postmenopausal women (trend P = 0.02). Our findings suggest that parity number and age at menopause have great effects on breast cancer risk among Japanese women. SN - 1573-7225 UR - https://www.unboundmedicine.com/medline/citation/19816778/Reproductive_factors_exogenous_female_hormone_use_and_breast_cancer_risk_in_Japanese:_the_Miyagi_Cohort_Study_ L2 - https://doi.org/10.1007/s10552-009-9443-7 DB - PRIME DP - Unbound Medicine ER -