A Case Series of Metastatic Metaplastic Breast Carcinoma Treated With Anti-PD-1 Therapy.
Publication Title
Front Oncol
Document Type
Article
Publication Date
1-1-2021
Keywords
oregon; portland; chiles
Abstract
Metaplastic breast cancer is a rare and often chemo-refractory subtype of breast cancer with poor prognosis and limited treatment options. Recent studies have reported overexpression of programmed death ligand 1 (PD-L1) in metaplastic breast cancers, and there are several reports of anti-PD-1/L1 being potentially active in this disease. In this case series, we present 5 patients with metastatic metaplastic breast cancer treated with anti-PD-1-based therapy at a single center, with 3 of 5 cases demonstrating a response to therapy, and one of the responding cases being a metaplastic lobular carcinoma with low-level hormone receptor expression. Cases were evaluated for PD-L1 expression, tumor infiltrating lymphocytes (TILs), DNA mutations, RNA sequencing, and T-cell receptor sequencing. Duration of the response in these cases was limited, in contrast to the more durable responses noted in other recently published reports.
Area of Special Interest
Cancer
Area of Special Interest
Women & Children
Specialty/Research Institute
Earle A. Chiles Research Institute
Specialty/Research Institute
Oncology
Specialty/Research Institute
Obstetrics & Gynecology
