Risk of Breast Cancer-Related Lymphedema: Development and Validation of a Clinically-Relevant, Patient-Facing Prediction Model. Breast cancer-related lymphedema (BCRL) is a common complication of axillary lymph node dissection (ALND) that can also develop after sentinel lymph node biopsy (SLNB). Several models have been developed to predict risk of BCRL; however, all have shortcomings that include omission of key variables (e.g., SLNB and race/ethnicity) and inclusion of datapoints that are not readily available to patients. Purpose: To develop simple and accurate prediction models for BCRL that can be used to estimate preoperative and postoperative risk.