The univariable prognostic effect of high vs. low TILs was essentially the same in patients with ER+/HER2− tumours (HRBCFi 0.40; 95% CI 0.14–1.09; P = 0.07) as well as in HER2+ (HRBCFi 0.28; 95% CI 0.06–0.97; P = 0.05) and TNBC tumours (HRBCFi 0.27; 95% CI 0.08–0.88; P = 0.03). The gene discussed is ERBB2; the disease is neoplasm.