Since our multivariate prognostic model identified TGFB2-dependent prognostic markers across the TCGA cohorts including unclassified, basal, normal, luminal A, luminal B, and HER2+, we performed a STRING network analysis on the PAM50 gene signature that classifies cancers according to luminal A, luminal B, HER2+, basal-like, and normal-like, and it has been further developed by combining risk scores to improve future recurrence risk [67,68]. The gene discussed is ERBB2; the disease is cancer.