A chemo-enzymatic study of the enzyme G-6-PhD in the blood of individuals with leukemia and lipid level estimation and blood tests for cancer patients in the Kirkuk city. The study included 80 samples, 30 of them were healthy and considered as control group while 50 patients were the sample with leukemia, which was collected from the center of cancer tumors in Kirkuk, the age of the sample varied from (1 to 60) years old. The study evaluated the level of effectiveness of G-6-PhD from red blood cells by using the diagnostic kit (BioLaBo). There is a decrease in the level of G-6-PhD enzyme effectiveness, especially in the second age group where there was a clear decrease in this category compared to healthy people. In addition, serum lipid levels were measured for people with leukemia, where they found a decrease in fat levels (HDL, CHOL) and an increase of (V.LDL, LDL, T.G). Also, some blood tests were conducted in people with leukemia. There was a decrease in the level of (HB, PLT, PCV) and increase at the level of both (WBC) compared to healthy.