Characteristics of studies included in the meta-analysis.

IHC, immunohistochemistry; FEC, 5-fluorouracil, epirubicin, and cyclophosphamide; FAC, 5-fluorouracil, doxorubicin, and cyclophosphamide; CMF, cyclophosphamide, mitomycin C and 5-fluorouracil; AVCMF, doxorubicin, vincristine, cyclophosphamide, methotrexate and 5-fluorouracil; P-FEC, sequential paclitaxel and 5-FU/epirubicin/cyclophosphamide; FUMI regimen, 5-fluorouracil (1,000 mg/m2 on days 1 and 2) and mitomycin; EC, epirubicin and cyclophosphamide; A, doxorubicin; E, epirubicin; T, docetaxel; P, paclitaxel; G, gemcitabine; FASAY, RNA-based functional assay in yeast; TTGE, temporal temperature gradient gel electrophoresis. N, can not be grouped; A-b, anthracycline-based neoadjuvant chemotherapy.