BCL2 and chronic kidney disease: According to the comparison results of the average blood parameters between the clinically healthy age-matched and CKD cats, the CKD stage (P = 0.0001) was statistically different between the clinically normal age-matched and CKD cats, followed by creatinine (P = 0.02), BUN (P = 0.02), and Bcl-2 (P = 0.05) (Figure 3).