ERBB2 and breast cancer: The possible reasons for these disparities may be as follows: first, our results should be interpreted cautiously since there were relatively few patients with triple-negative and HER2+ BC in our patient cohort, and second, there were more patients with luminal A subtype of BC in those aged 80 years and older, which is in line with a previous study showing that the group diagnosed at an age above 60 years had a higher percentage of ER/PR-positive BC than patients aged ≤ 60 years 25.