DPP4 and chronic myelogenous leukemia, BCR-ABL1 positive: There was a significant difference in the CD26 counts between the WBC count more than 150x103/μL and WBC count less than or equal to 150x103/μL with a mean rank of 23.87 and 7.80, respectively (Z = -2.690, p = 0.007); however, there was no significant difference in the percentage of CD26-positive LSCs between both groups, Z = -0.748, p = 0.455. A Spearman’s rank-order correlation was run to determine the relationship between the absolute number of CD26-positive LSCs in CML and WBC count.