ERBB2 and breast cancer: Nevertheless, when compared to triple negative patients, a significantly lower risk of developing bone relapse was discerned in the multivariate Cox regression analysis for ERBB2+ women (P = 0.048; HR = 0.384, 95% CI 0.148-0.991), with the borderline significance for HR+/ERBB2- breast cancers (P = 0.058; HR = 0.479, 95% CI 0.224-1.025; Table 2).