ERBB2 and triple-negative breast carcinoma: In this study, among patients with HER2+ tumors and triple negative breast cancer who had an ALND and achieved a breast pCR (n = 33), all those with additional positive non-SLNs (n = 9) had low-volume disease (in seven patients, the non-SLNs contained ITCs, and in two patients they contained micrometastases).