ERBB2 and glycogen storage disease VI: Of the 32 false-positive cases, 25 (78%) were of the luminal subtype-luminal A (n =2); luminal B (n = 14); and luminal B HER2+ (n = 9)-one (3%) was of theHER2-enriched subtype, and six (20%) were of the triple-negative subtype.Examination of the surgical specimen revealed five false-positive cases withextensive residual disease (RCB class III), all of which were estrogenreceptor-positive (four luminal and one luminal B HER2+).