ERBB2 and breast cancer: The estimated number of prevalent cases of HER2-positive EBC in the Philippines is 11,872 which was calculated based on the estimated proportion of early-stage cases (i.e., 80% [7]) among all HER2-positive patients which is about 23.17% (i.e., HER2-positivity rate in the Philippines [7]) of the total breast cancer prevalent cases in the country [8].