Two cases of development of entecavir resistance during entecavir treatment for nucleoside-naive chronic hepatitis B.

Kobashi H, Fujioka S, Kawaguchi M, Kumada H, Yokosuka O, Hayashi N, Suzuki K, Okanoue T, Sata M, Tsubouchi H, Sato C, Kiyosawa K, Tanikawa K, Seriu T, Ishikawa H, Takaki A, Iwasaki Y, Osawa T, Takaki T, Sakaguchi K, Shiratori Y, Yamamoto K, Tenney DJ, Omata M
Hepatology international (2009), Volume 3, Page 403
PubMed entry Full article text Publisher's site

Abstract:

Entecavir (ETV) is a potent nucleoside analogue against hepatitis B ...
Entecavir (ETV) is a potent nucleoside analogue against hepatitis B virus (HBV), and emergence of drug resistance is rare in nucleoside-naive patients because development of ETV resistance (ETVr) requires at least three amino acid substitutions in HBV reverse transcriptase. We observed two cases of genotypic ETVr with viral rebound and biochemical breakthrough during ETV treatment of nucleoside-naive patients with chronic hepatitis B (CHB).

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