ERBB2 and breast cancer: When non-pCR but iCR cases were assessed for the histological therapeutic effect according to the criteria recommended by the Japanese Breast Cancer Society (Kurosumi et al. 2008), 3 of 11 cases of luminal subtype were “slightly responsive” with the other 8 cases being “moderately responsive”, whereas only one each of the luminal/HER2, HER2-enriched and triple-negative subtypes were “slightly responsive”.