Fig. 1The HBs antigen was negative before the rituximab-CHOP chemotherapy. At the time of relapse, a routine screening test revealed the presence of HBs antigen. The HBV DNA titer was increased to 1,165.9 pg/ml, while the liver function test showed normal values. After administering lamibudine, the HBV DNA titer decreased to 26.8 pg/ml. During the salvage chemotherapy, the liver function stayed within the normal range.
Table 1Summary of the reported cases of HBV reactivation associated with the use of rituximab in surface antigen-negative patients