Among FIT positives (Figure 1B), sCD26 was detected in 15/21 CRC cases (71.43%), DPP4 in 16/18 (88.89%; activity was not measured in 3 cases), and the sCD26/DPP4 ratio in 10/18 (55.56%). The gene discussed is DPP4; the disease is colorectal carcinoma.