title: Breast cancer in Mexican women: an epidemiological study with cervical cancer control.
abstract: BACKGROUND
  In Mexico, breast cancer (BC) is one of the main causes of cancer deaths in women, with increasing incidence and mortality in recent years. Therefore, the aim of the study is identify possible risk factors related to BC.
  
  
  METHODS
  An epidemiological study of hospital cases of BC and controls with cervical uterine cancer (CUCA) was carried out at eight third level concentration hospitals in Mexico City. The total of 353 incident cases of BC and 630 controls with CUCA were identified among women younger than 75 years who had been residents of the metropolitan area of Mexico City for at least one year. Diagnosis was confirmed histologically in both groups. Variables were analyzed according to biological and statistical plausibility criteria. Univariate, bivariate and multivariate analyses were carried out. Cases and controls were stratified according to the menopausal hormonal status (pre and post menopause).
  
  
  RESULTS
  The factors associated with BC were: higher socioeconomic level (OR= 2.77; 95%CI = 1.77 - 4.35); early menarche (OR= 1.32; 95%CI= 0.88 - 2.00); old age at first pregnancy (>31 years: OR= 5.49; 95%CI= 2.16 - 13.98) and a family history of BC (OR= 4.76; 95% CI= 2.10 - 10.79). In contrast, an increase in the duration of the breastfeeding period was a protective factor (>25 months: OR= 0.38; 95%CI= 0.20 - 0.70).
  
  
  CONCLUSIONS
  This study contributes to the identification of risk factors for BC described in the international literature, in the population of Mexican women. Breastfeeding appears to play an important role in protecting women from BC. Because of changes in women's lifestyles, lactation is decreasing in Mexico, and young women tend not to breastfeed or to shorten the duration of lactation.
authors.affiliation: Research Center for Population Health, National Institute of Public Health, Cuernavaca Mor, México. vtovar@insp3.insp.mx
authors.forename: V
authors.initials: V
authors.lastname: Tovar-Guzmán
authors.forename: C
authors.initials: C
authors.lastname: Hernández-Girón
authors.forename: E
authors.initials: E
authors.lastname: Lazcano-Ponce
authors.forename: I
authors.initials: I
authors.lastname: Romieu
authors.forename: M
authors.initials: M
authors.lastname: Hernández Avila
mesh_terms: D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D001943:Breast Neoplasms / Q000453:epidemiology* / Q000209:etiology; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D015994:Incidence; D008423:Maternal Age; D008572:Menarche; D008800:Mexico / Q000453:epidemiology; D008875:Middle Aged; D016017:Odds Ratio; D012307:Risk Factors; D012959:Socioeconomic Factors; D014505:Urban Population / Q000706:statistics & numerical data; D002583:Uterine Cervical Neoplasms / Q000453:epidemiology