Breast cancer remains the leading type of cancer in women globally and accounts for 25% of all cancer cases diagnosed. It results in approximately half a million deaths and approximate loss of 15 million disability-adjusted life years. 1 In Brazil, where its incidence increases by 1.8 cases per 100 000 inhabitants per year, 2 existing socioeconomic inequality greatly influences the early diagnosis and prevention of breast cancer, 3 thereby, creating a great challenge to the public health services focusing on the disease.In addition to socioeconomic inequality, other existing forms of inequality in Brazil 4 can also influence the outcomes related to breast cancer. Moreover, all these factors contribute to increased rates of smoking, physical inactivity, excessive alcohol consumption, and overweight, which are risk factors for chronic diseases and are also related to breast cancer. 5 In this context, from a public health point of view, it is important to know which of these factors are associated with the incidence and mortality of such disease.Thus, we performed an ecological study analyzing secondary data obtained from the Department of Information Technology of SUS (DATASUS) and the United Nations Development Program (UNDP). The units of analysis were the years between 2006 and 2014. Deaths and hospital admissions for breast cancer in women were collected from the Mortality Information System and Hospital Information System (HIS), respectively. Both are available for public access in the Department of Information Technology of the Brazilian Unified Health System (SUS), maintained by the Brazilian Ministry of Health. Hospital admission and mortality rates were estimated by 100 000 women and age-standardized by age according to the World Health Organization by the direct method. After univariate analysis of the Pearson's correlation, a multiple linear regression was performed, adopting the stepwise backward strategy, using the criteria for the withdrawal of P > 0.20 model. The level of significance was 5%. The program used was Stata® (Stata Corp., College Station, TX, USA) 11.0. The main results found were that between 2006 and 2014, overweight, average cost of hospital admission, number of available SUS mammographs, and the HDI were the main factors that influenced the mortality and hospital admission rate of breast cancer in Brazil (Table 1). The model that analyzes the socioeconomic aspects presented better explanatory capacity (r 2 = 0.99) than the models related to T A B L E 1 Correlation of variables with indicators of breast cancer in Brazil Indicator Mortality a Hospital admission rate a r P b r P b Lifestyle Overweight women rate 0.927 <0.001 0.807 0.008 Rate of physically inactive women 0.422 0.257 0.317 0.405 Rate of women with alcohol abuse 0.204 0.597 0.069 0.859 Excessive smoking rate among women −0.698 0.036 −0.669 0.048 Health service Doctors c 0.979 <0.001 0.864 0.002 Beds c −0.935 0.002 −0.871 0.010 Mammographs in SUS c 0.959 <0.001 0.878 0.002 Socioeconomic Human development index 0.994 <0.001 0...