FN1 and breast cancer: Next, we examined the association between the expression levels of SDC2 and FN genes and the therapeutic response of breast cancer patients to different chemotherapy treatments such as Taxane, Anthracycline, Ixabepilone, Cyclophosphamide, Methotrexate, and Fluorouracil (CMF), Fluorouracil, Adriamycin, and Cytoxan (FAC), and Fluorouracil, Epirubicin, Cyclophosphamide (FEC).