GAPDH and familial pancreatic carcinoma: Results of real-time quantitative PCR detection of differentially expressed genes listed in Fig. 6, the relative expression of each gene in the figure was calculated according to the relative expression quantity = 2 - ΔCT formula, where ΔCT = CT value of target gene - CT value of internal reference gene (GAPDH), as can be seen from the figure, in addition to CLPS, the expression level of differential genes in Mongolian pancreatic cancer tissues was significantly higher than that in Han pancreatic cancer tissues.