ERBB2 and neoplasm: The multivariate Cox proportional-hazards models including age at diagnosis, invasive grade, tumour size, nodal involvement, HER2 status, and chemotherapy treatment also showed no evidence of a difference in survival, with a hazard ratio of 0.94 (95% CI: 0.83, 1.04) for overall survival in patients with ER+ ILC compared to ER+ IDC.