Fig. 4

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 composed of cases with score 0 and another comprising cases with any level of positivity (scores 1+, 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 composed of cases with score 0 and another comprising cases with any level of positivity (scores 1+, 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