Six ApoE genotypes were found in patients with T2DM, with the ɛ3/ɛ3 and ɛ3/ɛ4 types having the highest genotype frequencies (60.83% and 23.96%, respectively), followed by 10.77% with ɛ2/ɛ3, 2.15% with ɛ4/ɛ4, 1.75% with ɛ2/ ɛ4 (1.75%), and 0.54% with ɛ2/ɛ2. The gene discussed is APOE; the disease is type 2 diabetes mellitus.