Adefovir Dipivoxil for the Treatment of Hepatitis B e AntigenPositive Chronic Hepatitis B
Patrick Marcellin, M.D., Ting-Tsung Chang, M.D., Seng Gee Lim, M.D., Myron J. Tong, Ph.D., M.D., William Sievert, M.D., Mitchell L. Shiffman, M.D., Lennox Jeffers, M.D., Zachary Goodman, M.D., Ph.D., Michael S. Wulfsohn, M.D., Ph.D., Shelly Xiong, Ph.D., John Fry, B.Sc., Carol L. Brosgart, M.D., for the Adefovir Dipivoxil 437 Study Group
Background In preclinical and phase 2 studies, adefovir dipivoxildemonstrated potent activity against hepatitis B virus (HBV),including lamivudine-resistant strains.
Methods We randomly assigned 515 patients with chronic hepatitisB who were positive for hepatitis B e antigen (HBeAg) to receive10 mg of adefovir dipivoxil (172 patients), 30 mg of adefovirdipivoxil (173), or placebo (170) daily for 48 weeks. The primaryend point was histologic improvement in the 10-mg group as comparedwith the placebo group.
Results After 48 weeks of treatment, significantly more patientswho received 10 mg or 30 mg of adefovir dipivoxil per day thanwho received placebo had histologic improvement (53 percent[P<0.001], 59 percent [P<0.001], and 25 percent, respectively),a reduction in serum HBV DNA levels (by a median of 3.52 [P<0.001],4.76 [P<0.001], and 0.55 log copies per milliliter, respectively),undetectable levels (fewer than 400 copies per milliliter) ofserum HBV DNA (21 percent [P<0.001], 39 percent [P<0.001],and 0 percent, respectively), normalization of alanine aminotransferaselevels (48 percent [P<0.001], 55 percent [P<0.001], and16 percent, respectively), and HBeAg seroconversion (12 percent[P=0.049], 14 percent [P=0.01], and 6 percent, respectively).No adefovir-associated resistance mutations were identifiedin the HBV DNA polymerase gene. The safety profile of the 10-mgdose of adefovir dipivoxil was similar to that of placebo; however,there was a higher frequency of adverse events and renal laboratoryabnormalities in the group given 30 mg of adefovir dipivoxilper day.
Conclusions In patients with HBeAg-positive chronic hepatitisB, 48 weeks of 10 mg or 30 mg of adefovir dipivoxil per dayresulted in histologic liver improvement, reduced serum HBVDNA and alanine aminotransferase levels, and increased the ratesof HBeAg seroconversion. The 10-mg dose has a favorable riskbenefitprofile for long-term treatment. No adefovir-associated resistancemutations were identified in the HBV DNA polymerase gene.
Source Information
From the Service d'Hépatologie, INSERM Unité 481, and Centre de Recherches Claude Bernard sur les Hépatites Virales, Hôpital Beaujon, Clichy, France (P.M.); the Department of Internal Medicine, National Cheng Kung University Hospital, Tainan, Taiwan (T.-T.C.); the Division of Gastroenterology, National University Hospital, Singapore (S.G.L.); the Liver Center, Huntington Medical Research Institutes, Pasadena, Calif. (M.J.T.); the Department of Medicine, Monash University and Monash Medical Centre, Melbourne, Australia (W.S.); the Division of Gastroenterology, Virginia Commonwealth University Health System, Richmond (M.L.S.); the Center for Liver Diseases, University of Miami School of Medicine, and the Miami Veterans Affairs Medical Center, Miami (L.J.); the Armed Forces Institute of Pathology, Washington, D.C. (Z.G.); and Gilead Sciences, Foster City, Calif. (M.S.W., S.X., J.F., C.L.B.).
Address reprint requests to Dr. Marcellin at the Service d'Hépatologie, INSERM Unité 481, and Centre de Recherches Claude Bernard sur les Hépatites Virales, Hôpital Beaujon, 100 Blvd. du Général Leclerc, 92110 Clichy, France, or at marcellin{at}bichat.inserm.fr.
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