ERBB2 and breast cancer: Studies including Only Specific BC Molecular Subtypes: NRL was correlated with OS in patients with HER2-positive BC, in the univariate and multivariate analyses (HR = 0.35; 95%CI 0.13–0.84; p = 0.018) [61], and also in patients with hormone receptor-positive in the univariate analysis (multivariate results not available) [59].