The Safe Use of I-Seeds as a Localization Technique in Breast Cancer during Pregnancy.

Introduction: Some aspects of the treatment protocol for breast cancer during pregnancy (PrBC) have not been thoroughly studied. This study provides clarity regarding the safety of the use of I-seeds as a localization technique for breast-conserving surgery in patients with PrBC.

Methods: To calculate the exposure to the fetus of one I-seed implanted in a breast tumor, we developed a model accounting for the decaying I-source, time to surgery, and the declining distance between the I-seed and the fetus.