OPN (SPP1), VEGFA, p14ARF and BRAF, exhibited equal expression levels between BC and normal tissue, whereas MMP2, MMP9, TIMP1, TIMP2, FGF2, EGFR, EGF, Ki-67, KRAS, NRAS, and ARAF showed significantly lower expression levels in BC vs. normal tissue. The gene discussed is KRAS; the disease is breast cancer.