Then, <i>GGT1</i> genotype was also significantly associated with EUS total score and the size of cyst more than 20 mm and more than 30 mm as one of worrisome features of IPMN.<h4>Conclusion</h4>Genotypes of carboxypeptidase A1 and gamma-glutamyltransferase 1 may be useful tools for the diagnosis and the predictor of worrisome features of IPMN. The gene discussed is GGT1; the disease is cyst.