Breast Cancer and Matched Lymph Node Metastasis Tissue Microarray

This breast cancer tissue microarray (TMA) contains paired samples of primary tumors and matched regional lymph node metastases, enabling high-throughput analysis of tumor biology and biomarker expression. Each microarray includes 50 patient cases with 100 cores of 1.0 mm diameter, providing representative tumor regions for research applications. Comprehensive clinical and pathological data is included: TNM staging (AJCC 8th edition), pathology grade, and IHC marker expression for ER, PR, Her-2, and Ki67.