Furthermore, the pre-operative blood levels of CD326+ cells in the cancer patients ranged between 0 and 165 (mean, 24.45±34.92; 95% CI, 12.97–35.92; median, 11.50), while those of the CD26+/CD326− cells ranged between 0 and 24 (mean, 3.97±6.4; 95% CI, 2.53–5.41; median, 0). This evidence concerns the gene DPP4 and cancer.