Rachel Winer

Rachel Winer is a breast pathologist whose research focuses on the reproducibility and clinical implications of HER2 immunohistochemistry scoring in the 1+ and 2+ range, which defines the HER2-low category. She has studied inter-observer variability among pathologists for HER2-low scoring and developed standardized approaches to improve consistency. Her work is directly relevant to ensuring that patients eligible for T-DXd therapy are accurately identified, and she has contributed to revised ASCO/CAP HER2 testing guidelines.