From the three studies that have previously analyzed this, one study denies the prognostic value of FAK in adenocarcinomas of the colon [16], whereas the other two studies have provided evidence for the prognostic value of immunohistochemically detected FAK expression in esophageal squamous carcinoma and in hepatocellular carcinoma, respectively [15,17]. The gene discussed is PTK2; the disease is hepatocellular carcinoma.