ERBB2 and breast carcinoma: However, several single-institution studies did not find racial and ethnic disparities in pCR rates,22,23,24 while registry-based large studies reported that Black patients achieved lower rates of pCR in triple-negative and HR−/ERBB2+ breast cancer.8,11 With a larger sample size than previous registry-based studies,8,11 we confirmed that Black patients had lower pCR rates than White patients with HR−/ERBB2+ and TNBC.