Erratum to: The effect of trastuzumab-based chemotherapy in small node-negative HER2-positive breast cancer (Breast Cancer Res Treat, (2016), 158, 361–371, 10.1007/s10549-016-3878-9)

In the original publication of the article, the P-value for two interactions tests was accidently swapped. Under the heading Overall survival, the sentence starting with “Also, for HR status no…… 0 .95)” should read as “Also, for HR status no heterogeneity of treatment effect wasfound (P-value for interaction 0.75). Under the heading Breast cancer-specific survival, the sentence starting with “Again, no evidence…… 0.75)” should read as “Again, no evidence for heterogeneity of treatment effect was found with tumor size (P-value for interaction 0.95). In Table 1 of the Electronic Supplementary Material the hazard ratio for incidence year in the multivariate analysis was placed incorrectly by mistake. The corrected version of the table is given in supplementary material. The conclusion remains unaffected by these corrections.