title: Phase 1b study of pegylated interferon lambda 1 with or without ribavirin in patients with chronic genotype 1 hepatitis C virus infection.
abstract: Interferon lambda 1 (IFN-lambda1) is a type III IFN that produces intracellular responses similar to those of IFN-alpha but in fewer cell types because of differences in the receptor distribution pattern, and this could potentially result in an improved safety profile. This was an open-label three-part study of patients with chronic hepatitis C virus (HCV) genotype 1 infection. Part 1 evaluated single-agent pegylated interferon lambda (PEG-IFN-lambda) at 1.5 or 3.0 microg/kg administered every 2 weeks or weekly for 4 weeks in patients who had relapsed after previous IFN-alpha-based treatment. Part 2 evaluated weekly doses of PEG-IFN-lambda ranging from 0.5 to 2.25 microg/kg in combination with ribavirin (RBV) for 4 weeks in treatment-relapse patients. Part 3 evaluated weekly PEG-IFN-lambda at 1.5 microg/kg in combination with RBV for 4 weeks in treatment-naive patients. Fifty-six patients were enrolled: 24 patients in part 1, 25 patients in part 2, and 7 patients in part 3. Antiviral activity was observed at all PEG-IFN-lambda dose levels (from 0.5 to 3.0 microg/kg). Two of seven treatment-naive patients (29%) achieved rapid virological response. Treatment was well tolerated with minimal flu-like symptoms and no significant hematologic changes other than RBV-associated decreases in hemoglobin. The most common adverse events were fatigue (29%), nausea (12%), and myalgia (11%). Six patients experienced increases in aminotransferases that met protocol-defined criteria for dose-limiting toxicity (DLT) or temporarily holding therapy with PEG-IFN-lambda. Most DLT occurred in patients with high PEG-IFN-lambda exposure.
  
  
  CONCLUSIONS
  Weekly PEG-IFN-lambda with or without daily RBV for 4 weeks is well tolerated with minimal adverse events and hematologic effects and is associated with clear antiviral activity across a broad range of doses in patients with chronic HCV.
authors.affiliation: Division of Gastroenterology, Duke University, Durham, NC 27701, USA. muir0002@mc.duke.edu
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Muir
authors.forename: Mitchell L
authors.initials: ML
authors.lastname: Shiffman
authors.forename: Atif
authors.initials: A
authors.lastname: Zaman
authors.forename: Boris
authors.initials: B
authors.lastname: Yoffe
authors.forename: Andrew
authors.initials: A
authors.lastname: de la Torre
authors.forename: Steven
authors.initials: S
authors.lastname: Flamm
authors.forename: Stuart C
authors.initials: SC
authors.lastname: Gordon
authors.forename: Paul
authors.initials: P
authors.lastname: Marotta
authors.forename: John M
authors.initials: JM
authors.lastname: Vierling
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Lopez-Talavera
authors.forename: Kelly
authors.initials: K
authors.lastname: Byrnes-Blake
authors.forename: David
authors.initials: D
authors.lastname: Fontana
authors.forename: Jeremy
authors.initials: J
authors.lastname: Freeman
authors.forename: Todd
authors.initials: T
authors.lastname: Gray
authors.forename: Diana
authors.initials: D
authors.lastname: Hausman
authors.forename: Naomi N
authors.initials: NN
authors.lastname: Hunder
authors.forename: Eric
authors.initials: E
authors.lastname: Lawitz
mesh_terms: D000328:Adult; D000368:Aged; D000998:Antiviral Agents / Q000009:adverse effects / Q000627:therapeutic use*; D015331:Cohort Studies; D004305:Dose-Response Relationship, Drug; D004359:Drug Therapy, Combination; D005221:Fatigue / Q000139:chemically induced; D005260:Female; D005838:Genotype; D016174:Hepacivirus / Q000235:genetics*; D019698:Hepatitis C, Chronic / Q000188:drug therapy*; D006801:Humans; D007372:Interferons; D007378:Interleukins / Q000009:adverse effects / Q000627:therapeutic use*; D008297:Male; D008875:Middle Aged; D009325:Nausea / Q000139:chemically induced; D011092:Polyethylene Glycols / Q000009:adverse effects / Q000627:therapeutic use; D011994:Recombinant Proteins / Q000009:adverse effects / Q000627:therapeutic use; D012254:Ribavirin / Q000627:therapeutic use*; D016896:Treatment Outcome; D000095022:Interferon Lambda
chemical_list: D000998:Antiviral Agents; D007372:Interferons; D007378:Interleukins; D011092:Polyethylene Glycols; D011994:Recombinant Proteins; D012254:Ribavirin; C000624353:interferon-lambda, human; D000095022:Interferon Lambda