Expression Patterns of ER, HER2, and NM23-H1 in Breast Cancer Patients with Different Menopausal Status

Objective: This study was designed to analyze expression patterns of estrogen receptor (ER), human epidermal growth factor receptor-2 (HER2/ERBB2), and nonmetastatic protein 23 (NM23-H1/NME1) proteins in patients with invasive ductal carcinoma and different menopausal status to identify their relationships with axillary lymph node metastasis.