Fig. 3

Kaplan – Meier survival curves according to the different groups of HER2 scores

A: The correlation between the different Her2 scores and overall survival (OS) by dividing Her2 scores into two groups: one comprising scores 0 and 1 + and another comprising scores 2 + and 3+. OS was defined as the duration from the time of surgery to the time of death or the last follow-up appointment; B: The correlation between the different Her2 scores and disease-free survival (DFS) by dividing Her2 scores into two groups: one comprising scores 0 and 1 + and another one comprising scores 2 + and 3+. DFS was measured from the time of surgery to that of cancer recurrence/ progression or the last follow-up visit. P-values of ≤ 0.05 were regarded as statistically significant