Among the specific molecular subtype groups, the numbers of patients with and without RT were as follows: luminal A (n = 2646 and 2607), luminal B/HER2-negative (n = 373 and 396), luminal B/HER2-positive (n = 667 and 705), basal-like (n = 390 and 398), and HER2-enriched breast cancer (n = 382 and 394), respectively. The gene discussed is ERBB2; the disease is breast cancer.