
Factors Associated with Delayed Hepatitis B Viral Suppression on Tenofovir Among HBV-HIV Coinfected Patients in the CNICS Cohort. Despite widespread use in HIV and hepatitis B virus (HBV) infection, the effectiveness of tenofovir (TDF) has not been studied extensively outside of small HBV-HIV coinfected cohorts. We examined the effect of prior lamivudine treatment (3TC) and other factors on HBV DNA suppression with TDF in a multi-site clinical cohort of coinfected patients. We studied all patients enrolled in the Centers for AIDS Research Network of Integrated Clinical Systems cohort from 1996-2011 who had chronic HBV and HIV infection, initiated a TDF-based regimen continued for ≥3 months and had on-treatment HBV measurements. We used Kaplan-Meier curves and Cox-Proportional hazards to estimate time to suppression (HBV DNA level <200 IU/ml or <1000 copies/ml) by selected covariates.