Matrix-Producing Carcinoma of the Breast: A Rare Triple-Negative, Vimentin-Positive Tumor With an Immune-Cold Microenvironment: A Case Report
Introduction: Matrix-producing carcinoma (MPC) is a rare subtype of metaplastic breast carcinoma characterized by a direct transition from epithelial carcinoma cells to a cartilaginous or osseous matrix. MPC typically exhibits a triple-negative immunophenotype and frequently expresses mesenchymal markers such as viment...