Objective: Breast cancer is the most prevalent oncologic diagnosis given to women all around the world, and can cause diverse psychiatric symptomatologies and damage to the life of its carrier. The concept of posttraumatic growth (PTG) focuses on the perception of a positive change from the experience of a stressing situation. This study's objective was to evaluate PTG and different predictor variables for women (n=84) with breast cancer in Brazil. Method: On this exploratory study, self-report scales referring to the diagnosis period and oncologic treatment were applied individually. Results: Having a husband/partner, adaptive coping strategies and a religion of identification were found to be predictor variables in different established regressive models. Rumination did not show any correlation to PTG scores, refuting the results of previous studies. The results found in this study confirm previous research as for PTG predictors, except for rumination. Conclusions: Positive changes resulting from experiencing breast cancer are present in Brazilian women and different interventions can be thought of based on the study of predictors.[es] Crecimiento postraumático y variables predictoras en mujeres brasileñas con cáncer de mama Resumen: Objetivo: El cáncer de mama es el diagnóstico oncológico más frecuente que se da a las mujeres en todo el mundo, y puede causar diversas sintomatologías psiquiátricas y daños a la vida de su portador. El concepto de crecimiento postraumático (CPT) se centra en la percepción de un cambio positivo desde la experiencia de una situación estresante. El objetivo de este estudio fue evaluar el CPT y diferentes variables predictoras para mujeres (n= 84) con cáncer de mama en Brasil. Método: En este estudio exploratorio, las escalas de autoinforme que se refieren al período de diagnóstico y 1 Carolina Villanova Quiroga -Pontifícia Universidade Católica do Rio Grande do Sul. state of Rio Grande do Sul -Brazil.