RESUMEN
BACKGROUND: breast cancer (BC) is the leading cause of death secondary to malignancy in women. It ranks third in mortality in women in reproductive age, produced by non-modifiable (genetic and hormonal) and modifiable factors. Our objective was to describe and analyze the epidemiological characteristics of deaths from BC in the State of Mexico. RESULTS: of 273 verbal autopsies, the most common age (23.07 %) was between 40 and 49 years. The educational level of schooling were complete elementary school (20.51 %), incomplete elementary school (19.04 %) and complete high school (13.91 %). the institution with the highest number of patients was the Instituto Mexicano del Seguro Social with 139 (50.91 %). The towns with a higher frequency were Malinalco, Ayapango, Atizapán, Zacualpan and Apaxco. The Mortality was higher in Valle de Bravo, Coatepec Harinas and Toluca. CONCLUSIONS: the increase in BC has permitted the emergence of a new hypothesis known as endocrine disruption, according to this premise, this results from exposure to chemicals introduced into the environment by human activity capable of altering the hormonal balance.