Clinical Practice Recommendations Based on an Updated Review of Breast Cancer Risk Among Women Treated for Childhood Cancer.

Breast cancer is the most common secondary malignancy among women treated for childhood cancer. This review highlights interacting etiologies contributing to development of secondary breast cancer to complement guidelines for surveillance and survivorship care and make recommendations for clinical practice. Treatment exposures determine Children's Oncology Group breast cancer surveillance guidelines; those treated with cumulative doses ≥20 Gy chest irradiation should undergo annual magnetic resonance imaging and mammography after age 25 years or 8 years after exposure, whichever comes last. Recent investigations suggest that those treated with cumulative doses ≥10 Gy in fields affecting breast tissue, specifically whole lung, should be counseled for similar surveillance. Childhood sarcoma and leukemia survivors treated with anthracyclines and/or alkylating agents without radiation have increased risk for breast cancer and may require enhanced surveillance. Multigene testing and/or genomic evaluation for predisposition among certain childhood cancer subtypes may prove to be beneficial in identifying those at greatest risk. Pediatric oncology nurses who incorporate this information into survivorship care planning discussions/documents and clinical research endeavors may help reduce breast cancer-related morbidity/mortality for this at-risk population.