title: Entecavir (Bristol-Myers Squibb).
abstract: Bristol-Myers Squibb (BMS) is developing entecavir, a viral replication inhibitor, for the potential treatment of hepatitis B virus (HBV) infection [220240]. The compound is a cyclopentyl guanosine analog and is in phase II trials in the US [383065]. Entecavir was originally developed as SQ-34676 for the treatment of herpes simplex virus infections [221992], but displayed only moderate activity which eventually led to discontinuation of development for this indication. However, Bristol-Myers Squibb later discovered that entecavir was extremely potent against HBV (ED50 = 3.0 nM, compared with 200 nM for lamivudine) with relatively low toxicity (CC50 = 30,000 nM) [221986] and acted through inhibition of DNA polymerase [220240]. The triphosphate form is a potent HBV polymerase inhibitor in both woodchuck and duck models [306056]. By September 2000, a large-scale clinical trial was underway in China for HBV infection [400209] and by October 2000 phase I trials were ongoing in Japan [384751]. In March 2001 SG Cowen predicted sales of US$25 million in 2002, US$50 million in 2003 and US$75 million in 2004 [403751].
authors.affiliation: Novartis Research Institute, General Dermatology, Vienna, Austria. andreas.billich@pharma.novartis.com
authors.forename: A
authors.initials: A
authors.lastname: Billich
mesh_terms: D000818:Animals; D000998:Antiviral Agents / Q000009:adverse effects / Q000493:pharmacokinetics / Q000494:pharmacology* / Q000627:therapeutic use / Q000633:toxicity; D002986:Clinical Trials as Topic; D000075202:Contraindications; D004791:Enzyme Inhibitors / Q000494:pharmacology; D006147:Guanine / Q000009:adverse effects / Q000031:analogs & derivatives* / Q000493:pharmacokinetics / Q000494:pharmacology* / Q000627:therapeutic use / Q000633:toxicity; D006509:Hepatitis B / Q000188:drug therapy; D006561:Herpes Simplex / Q000188:drug therapy; D006801:Humans; D019384:Nucleic Acid Synthesis Inhibitors; D013329:Structure-Activity Relationship
chemical_list: D000998:Antiviral Agents; D004791:Enzyme Inhibitors; D019384:Nucleic Acid Synthesis Inhibitors; C413685:entecavir; D006147:Guanine