(14) reviewed 119 breast cancer patients, analyzed the clinical predictive factors, including the invasive tumor size, histological grade, LVI, and overexpression of HER-2, for predicting NSLN metastasis in breast cancer patients with 1–2 positive SLNs, and developed a logistic regression model, yielding the best AUC of 0.71. The gene discussed is ERBB2; the disease is breast carcinoma.