The Effect of Switching from Tenofovir Disoproxil Fumarate (TDF) to Tenofovir Alafenamide (TAF) on Liver Enzymes, Glucose, and Lipid Profile

Objective: We aimed to investigate the effect of switching from tenofovir disoproxil fumarate (TDF) to tenofovir alafenamide (TAF) on the hepatic safety and metabolic profile. Methods: Consecutive HIV patients, enrolled in the Surveillance Cohort Long-term Toxicity Antiretrovirals/Antivirals (SCOLTA) project, switching from TDF to TAF were included. Changes from baseline (T0) to 6-month follow-up (T1) were evaluated using paired t-test and signed rank test. Results: A total of 190 patients switched from TDF to TAF and had one 6-month follow-up visit. They were 80% male, 74.2% at CDC stage A-B, 93.7% with undetectable HIV-viral load. Mean age was 46.7 +/- 10.7 years, body mass index was 25.0 +/- 3.9 kg/m(2), median CD4 cell count was 634 cell/nL (interquartile range [IQR]=439-900), aspartate aminotransferase (AST) was 23 (IQR=19-30) IU/L, and alanine aminotransferase (ALT) was 24 (IQR=17-34) IU/L. At T1, both AST (median=-1, IQR-5 2 IU/L, P 0.004) and ALT (median=-2, IQR-7 3 IU/L, P=0.0004) showed a significant decrease. Among 28 patients with ALT >40 at baseline, reduction was significant both clinically (-17, IQR=-32_-1) and statistically (P=0.0003). Total cholesterol levels (TC) increased (+13.4 +/- 3.8 mg/dL, P=0.0006), as well as HDL-cholesterol (HDL-C) (+3.8 +/- 1.2 mg/dL, P=0.02), LDL Cholesterol (LDL-C) (+7.6 +/- 3.4, P=0.03) and glucose (+4.0 +/- 1.8 mg/dL, P=0.02). D:A:D: and Framingham risk score did not change at 6 months after switch. Conclusion: A significant reduction of liver enzymes was observed after switching from TDF to TAF, especially in subjects with initial level of ALT >40 IU/L. Glucose, TC, HDL-C, and LDL-C increased, with no effect on cardiovascular risk scores.