Hepatitis B virus reactivation with rituximab-containing regimen

Figure 1 Antibody titer slightly increased and in three cases the titer declined. In nine cases, the antibody titer was the same and in 21 cases, it declined after rituximab and chemotherapy. In six of nine cases with anti-HBs titers > 1000 mIU/mL at the time of initial treatment, the titer did not fall below 1000 mIU/mL. In almost all cases where the initial anti-HBs titer was < 300 mIU/mL, the titer decreased. Of all cases where the initial anti-HBs titer was > 1000 mIU/mL, it dropped below 1000 mIU/mL in three of six patients.