0 log copies/mL (preferably undetectable HBV DNA using real time PCR). As evidence is accumulated, check details the indications for sequential therapy should become clearer. Comprehensive studies are lacking concerning sequential therapy in cases where a favorable therapeutic response is maintained by NA therapy. Ning et al. conducted a randomized controlled

study with 102 HBeAg positive patients without cirrhosis who were administered entecavir for 4 years, resulting in HBV DNA <3.0 log copies/mL and HBeAg <100 PEIU/mL. The sequential therapy group was administered entecavir+Peg-IFNα-2a synchronous combination therapy for 8 weeks, then Peg-IFN monotherapy for 40 weeks, and the entecavir monotherapy group was treated with entecavir alone. They reported that no difference between groups in the HBV DNA load, but a higher rate of HBsAg negative conversion during treatment for the sequential therapy group (27%, 4/15). As described above, in Japan sequential therapy is conducted with the aim of safely ceasing NAs, and there is no data concerning HBsAg negative conversion. Recurrence of hepatitis following cessation of NA therapy (including sequential therapy) has the potential to become severe, and retreatment may be necessary. The abovementioned MHLW research group proposed criteria for retreatment after cessation of NA therapy. A retrospective analysis of

patients who became Doxorubicin molecular weight inactive carriers found that approximately 2/3 experienced transient elevation of HBV DNA or ALT levels after cessation of NA therapy, clarifying that retreatment was not necessary for all cases of HBV DNA or ALT rebound.[208] However, a return to inactive carrier status is unlikely in cases with elevation of ALT ≥80 U/L or HBV DNA ≥5.8 log copies/mL, and retreatment should be considered. Recommendations

The aim of sequential therapy is not enhancement of the therapeutic efficacy of NAs, but as a method of safe cessation of NA therapy, and is currently indicated in “patients who have undergone HBeAg negative conversion during NA therapy, or are HBeAg negative”. Following cessation of NA therapy or completion of sequential therapy, a return to inactive carrier status is unlikely in cases with elevation of ALT ≥80 U/L or HBV DNA ≥5.8 log copies/mL, and retreatment should be considered. Peg-IFN therapy for a finite duration may provide drug-free, long-lasting HBeAg click here seroconversion, and also HBsAg negative conversion, with no development of drug resistance. For conventional IFN treatment, therapeutic efficacy fell for patients 35 years or older and for genotype C,[112] but in Peg-IFN clinical trials in Japan as well as overseas, there was no significant correlation between therapeutic efficacy and genotype or age.[8-10, 115, 124] Taking these characteristics into consideration, Peg-IFN monotherapy should be generally considered the first choice for initial treatment of chronic hepatitis, regardless of HBeAg status or HBV genotype.