PTK2 and neoplasm: To determine the -26-exon FAK expression in tumor tissues, the real-time PCR was performed according to the strategy as show in Figure 1D. The percentage of the -26-exon FAK expression was calculated using the following formula: Percentage (%) = [2-(Ct1-Ct3) - 2-(Ct2-Ct3)]/2-(Ct1-Ct3) × 100%.