Although the IHC analysis did not reveal a significant correlation between positive staining of CYP2C19 protein in tumor tissue and the expression of CYP2C19 gene in the microarray analysis (Figure 4B, P = 0.219), the cumulative RFS rate in patients with negative staining of CYP2C19 protein was significantly poorer than in patients with positive staining of CYP2C19 (Figure 3B, P = 0.006). The gene discussed is CYP2C19; the disease is neoplasm.