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The clinical applicability of early viral kinetics at week 4 in predicting sustained virological response (SVR) of pegylated interferon (peg-IFN) plus ribavirin (RBV) in HIV/HCV-coinfected patients is unclear. Our objective was to determine if rapid virological response (RVR) at week 4 of therapy with peg-IFN and RBV could predict SVR among HIV/HCV-coinfected patients.Methods   HIV/HCV-coinfected patients in whom an HCV viral load determination had been carried out at week 4 of therapy were included in the study. The positive predictive value (PPV) and the negative predictive value (NPV) of RVR (undetectable serum HCV RNA at 4 week) for SVR were calculated in the study population. Receiver operating characteristic curves were calculated to determine the best cutoff of HCV RNA decrease to predict treatment failure.Results   A total of 101 HIV/HCV-coinfected patients were included. RVR and SVR were observed in 39 (39%) and in 49 (48%) individuals, respectively. Of patients with RVR, 37/39 patients achieved SVR (PPV: 95%), whereas 50/62 individuals without RVR did not show SVR (NPV: 81%). The highest NPV (96%) was reached by using a cutoff level of HCV RNA decrease of 0.6 log 10 . By applying this cutoff level, treatment could have been discontinued in 25 (25%) patients.Conclusions   An undetectable serum HCV RNA determination at week 4 of treatment with peg-IFN plus RBV is a reliable predictor of SVR in HIV/HCV-coinfected patients. In addition, a decrease of HCV RNA less than 0.6 log 10  at this point of treatment could identify an appreciable proportion of individuals who will fail to achieve SVR.

Rapid virological response at week 4 predicts response to pegylated interferon plus ribavirin among HIV/HCV-coinfected patients