According to histology, the most prevalent tumor in the study was luminal B (21 of 62 patients, 33.9%), followed by triple-negative (16 of 62 patients, 25.8%), luminal hybrid (12 of 62 patients, 19.4%), luminal A (9 of 62 patients, 14.5%), while the least prevalent was HER2(+). The gene discussed is ERBB2; the disease is neoplasm.