Importantly, the multivariate Cox model − with tumor size, lymph node status, metastasis status, histology, Her2 status, menopause status, age at diagnosis, PAM50 classification and KCNJ3 status as co-variates − showed that only the KCNJ3 expression status had a significant impact on survival time (n = 228; p < 0.05; HR = 5.2 (1.3–21.8); Table 1). The gene discussed is ERBB2; the disease is neoplasm.