Introduction:

Breast cancer associated with pregnancy is defined as a malignant neoplasm of the breast that is diagnosed during pregnancy, breastfeeding or one year after delivery.

Objective:

To analyze perinatal outcomes in a series of young patients with breast cancer and pregnancy in a tertiary care hospital.

Methods:

Retrospective, analytical study of 26 women younger than 40 years of age with breast cancer who resolved their pregnancy at the National Institute of Perinatology between 2013 and 2018. Clinical-pathological characteristics, perinatal outcomes and family planning methods were studied. Percentages and central tendency measures were obtained, and comparisons were made with the chi-square test or Fisher's exact tests.

Results:

Association of breast cancer with pregnancy was observed in 0.26 % of all births; mean age of presentation was 34 years, 38.4 % of cases had cancer at advanced clinical stages and 57.1 % of the women were treated with modified radical mastectomy; no trend towards higher perinatal complications was observed.

Conclusions:

Breast cancer associated with pregnancy implies an oncological challenge and does not appear to be a risk factor for adverse perinatal outcomes.