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Oral contraceptives and breast cancer risk in Taiwan, a country of low incidence of breast cancer and low use of oral contraceptives.
Int J Cancer 1998; 77(2):219-23IJ

Abstract

One hundred and seventy four (81% of all) pathologically confirmed new incident cases of female breast cancer identified from a medical center in Taipei from February, 1993 to June, 1994 were selected as the case group. Four hundred and fifty three inpatient controls who were without obstetric-gynecological, breast, or malignant diseases were individually matched for each case by age and date of admission. Information was obtained through direct interview and review of medical records. Conditional logistic regression was used to estimate the effects of each risk factor. After adjusting for education level, body mass index, age at menarche and first full-term pregnancy, parity, menopausal status and age at menopause, lifetime lactation, use of lactation inhibition hormones, and family history of breast cancer, breast cancer risk significantly elevated in use of OC before 25 years old and before 1971. In stratified analysis, significantly higher risk were found in OC use before 25 years old and in duration of use less than one year among post-menopausal subjects. Our results support the notion that OC use in early life for younger women and in early calendar years increase breast cancer risk.

Authors+Show Affiliations

School of Public Health, College of Public Health, National Taiwan University, Taipei. weichu@episerv.cph.ntu.edu.twNo 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

9650556

Citation

Chie, W C., et al. "Oral Contraceptives and Breast Cancer Risk in Taiwan, a Country of Low Incidence of Breast Cancer and Low Use of Oral Contraceptives." International Journal of Cancer, vol. 77, no. 2, 1998, pp. 219-23.
Chie WC, Li CY, Huang CS, et al. Oral contraceptives and breast cancer risk in Taiwan, a country of low incidence of breast cancer and low use of oral contraceptives. Int J Cancer. 1998;77(2):219-23.
Chie, W. C., Li, C. Y., Huang, C. S., Chang, K. J., Yen, M. L., & Lin, R. S. (1998). Oral contraceptives and breast cancer risk in Taiwan, a country of low incidence of breast cancer and low use of oral contraceptives. International Journal of Cancer, 77(2), pp. 219-23.
Chie WC, et al. Oral Contraceptives and Breast Cancer Risk in Taiwan, a Country of Low Incidence of Breast Cancer and Low Use of Oral Contraceptives. Int J Cancer. 1998 Jul 17;77(2):219-23. PubMed PMID: 9650556.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Oral contraceptives and breast cancer risk in Taiwan, a country of low incidence of breast cancer and low use of oral contraceptives. AU - Chie,W C, AU - Li,C Y, AU - Huang,C S, AU - Chang,K J, AU - Yen,M L, AU - Lin,R S, PY - 1998/7/3/pubmed PY - 2000/6/20/medline PY - 1998/7/3/entrez KW - Asia KW - Biology KW - Breast Cancer KW - Cancer KW - Case Control Studies KW - China KW - Contraception KW - Contraceptive Methods--side effects KW - Developing Countries KW - Diseases KW - Eastern Asia KW - Family Planning KW - Neoplasms KW - Oral Contraceptives--side effects KW - Research Methodology KW - Research Report KW - Risk Factors--women KW - Studies KW - Taiwan KW - Women SP - 219 EP - 23 JF - International journal of cancer JO - Int. J. Cancer VL - 77 IS - 2 N2 - One hundred and seventy four (81% of all) pathologically confirmed new incident cases of female breast cancer identified from a medical center in Taipei from February, 1993 to June, 1994 were selected as the case group. Four hundred and fifty three inpatient controls who were without obstetric-gynecological, breast, or malignant diseases were individually matched for each case by age and date of admission. Information was obtained through direct interview and review of medical records. Conditional logistic regression was used to estimate the effects of each risk factor. After adjusting for education level, body mass index, age at menarche and first full-term pregnancy, parity, menopausal status and age at menopause, lifetime lactation, use of lactation inhibition hormones, and family history of breast cancer, breast cancer risk significantly elevated in use of OC before 25 years old and before 1971. In stratified analysis, significantly higher risk were found in OC use before 25 years old and in duration of use less than one year among post-menopausal subjects. Our results support the notion that OC use in early life for younger women and in early calendar years increase breast cancer risk. SN - 0020-7136 UR - https://www.unboundmedicine.com/medline/citation/9650556/Oral_contraceptives_and_breast_cancer_risk_in_Taiwan_a_country_of_low_incidence_of_breast_cancer_and_low_use_of_oral_contraceptives_ L2 - https://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0020-7136&date=1998&volume=77&issue=2&spage=219 DB - PRIME DP - Unbound Medicine ER -