gLOH scores were on average relatively high in ABRAZO and similar to those found in HER2– gBRCA1/2mut breast cancer (median 23.0%, based on N = 1730 tumors; 27.8% for gBRCA1mut and 21.0% for gBRCA2mut) from Foundation Medicine’s FoundationCore® database. Here, ERBB2 is linked to breast carcinoma.