Asian Pacific Journal of Cancer Prevention

Asian Pacific Journal of Cancer Prevention (아시아태평양암예방학회)
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Reproductive Variables and Risk of Breast Malignant and Benign Tumours in Yunnan Province, China

  • Yanhua, Che (Breast Department, The First Peoples' Hospital of Kunming) ;
  • Geater, Alan (Epidemiology Unit, Faculty of Medicine, Prince of Songkla University) ;
  • You, Jing (Department of Infectious Diseases, The First Affiliated Hospital of Kunming Medical University) ;
  • Li, Li (Breast Department, The First Peoples' Hospital of Kunming) ;
  • Shaoqiang, Zhou (The Department of Breast Cancer, The Tumor Hospital of Yunnan province) ;
  • Chongsuvivatwong, Virasakdi (Epidemiology Unit, Faculty of Medicine, Prince of Songkla University) ;
  • Sriplung, Hutcha (Epidemiology Unit, Faculty of Medicine, Prince of Songkla University)
  • Published : 2012.05.30
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Abstract

Introduction and aim: To compare reproductive factor influence on patients with pathological diagnosed malignant and benign tumor in the Breast Department, The First Peoples' Hospital of Kunming in Yunnan province, China. Methods: A hospital-based case-control study was conducted on 263 breast cancer (BC) cases and 457 non-breast cancer controls from 2009 to 2011. The cases and controls information on demographics, medical history, and reproductive characteristics variables were collected using a self-administered questionnaire and routine medical records. Histology of breast cancer tissue and benign breast lesion were documented by pathology reports. Since some variables in data analysis had zero count in at least one category, binomial-response GLM using the bias-reduction method was applied to estimate OR's and their 95% confidence intervals (95% CI). To adjust for age and menopause status, a compound variable comprising age and menopausal status was retained in the statistical models. Results: multivariate model analysis revealed significant independent positive associations of BC with short menstrual cycle, old age at first live birth, never breastfeeding, history of oral contraception experience, increased number of abortion, postmenopausal status, and nulliparity. Categorised by age and menopausal status, perimenopausal women had about 3-fold and postmenopausal women had more than 5-fold increased risk of BC compared to premenopausal women. Discussion and Conclusion: This study has confirmed the significant association of BC and estrogen related risk factors of breast cancer including longer menstrual cycle, older age of first live birth, never breastfeeding, nulliparity, and number of abortions more than one. The findings suggest that female hormonal factors, especially the trend of menopause status play a significant role in the development of BC in Yunnan women.

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References

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