[Risk factors in breast cancer. Prospective analysis of 414 patients].

This report has the purpose to analyze the risk factors for Breast Cancer in the population of female Mexican workers and their relatives living in the same socio-cultural environment. These risk factors were: age, number of pregnancies, age while first pregnant, early menarca, late menopause, no lactance, use of contraceptive pills, hereditary, mammary pathology, obesity, diabetes mellitus. The questions were asked to women older than 30 years of age to which a breast biopsy had been practiced; in 123 patients the biopsy reported a breast carcinoma in 291 patients the hystological reports showed a benign pathology other than cancer. The statistics were comparative among both groups with a p less than 0.001 each factor was analyzed for chi square. The average was of 44 years of age to which a breast biopsy had been practiced; groups with breast cancer 80% were pregnant before the age of 26 one with two or more births. The risk factors as the obesity, no lactancy, anticonceptives widely discussed and contradictors in the literature; in this group of patient with breast cancer resulted with statistic significance. The results suggest a population with breast cancer with own characteristics.