Significant improvement in triglyceride levels after switching from ritonavir to cobicistat in suppressed HIV-1-infected subjects with dyslipidaemia.

Methods: This restrospective observational study to evaluated changes in lipid parameters and the percentage of subjects with dyslipidemia in virologically suppressed HIV-infected patients who were receiving a regimen containing darunavir/ritonavir and were then switched from ritonavir to cobicistat, carried out from December 2015 to May 2016, included 299 HIV-1-infected patients who were on stable antiretroviral treatment including darunavir/ritonavir (monotherapy, bitherapy or triple therapy for at least 6 months) and were then switched from ritonavir to cobicistat. Lipid parameters, as well as plasma HIV-1 RNA and CD4 cell counts, were recorded at baseline just before the switch, and 24 weeks after the switch. Patients were stratified according to the presence of hypercholesterolaemia [baseline total cholesterol > 200 mg/dL and/or low-density lipoprotein (LDL) cholesterol > 130 mg/dL] or hypertriglyceridaemia (baseline triglyceride levels > 200 mg/dL).

Results: Two hundred and ninety-nine patients were enrolled in the study. Fifty-two per cent of the total study population showed dyslipidaemia at baseline. All patients maintained HIV-1 RNA ≤ 50 HIV-1 RNA copies/mL at week 24. No statistically significant changes were seen in CD4 T-cell count from baseline to week 24 [654 (298) to 643 (313) cells/μL; P = 0.173]. When patients were stratified according to the presence of hypercholesterolaemia at baseline (n = 124), significant changes were observed in total cholesterol (P  0.001), LDL cholesterol (P = 0.047), high-density lipoprotein (HDL) cholesterol (P = 0.002) and triglyceride levels (P = 0.025), and when they were stratified according to the presence of hypertriglyceridaemia at baseline (n = 64), changes from baseline to week 24 in triglyceride level were statistically significant [median (interquartile range) 352 (223, 389) mg/dL at baseline and 229 (131, 279) mg/dL at week 24; P  0.001].

Conclusion: Two hundred and ninety-nine patients were enrolled in the study. Fifty-two per cent of the total study population showed dyslipidaemia at baseline. All patients maintained HIV-1 RNA ≤ 50 HIV-1 RNA copies/mL at week 24. No statistically significant changes were seen in CD4 T-cell count from baseline to week 24 [654 (298) to 643 (313) cells/μL; P = 0.173]. When patients were stratified according to the presence of hypercholesterolaemia at baseline (n = 124), significant changes were observed in total cholesterol (P  0.001), LDL cholesterol (P = 0.047), high-density lipoprotein (HDL) cholesterol (P = 0.002) and triglyceride levels (P = 0.025), and when they were stratified according to the presence of hypertriglyceridaemia at baseline (n = 64), changes from baseline to week 24 in triglyceride level were statistically significant [median (interquartile range) 352 (223, 389) mg/dL at baseline and 229 (131, 279) mg/dL at week 24; P  0.001].