• Frequency and severity of adverse events [ Time Frame: Throughout study ] [ Designated as safety issue: Yes ]
  
• Absolute change in platelet count from baseline [ Time Frame: Through Week 12 ] [ Designated as safety issue: No ]
  

Peginterferon alfa-2 with ribavirin is the current standard of care for the treatment of HCV infection; however, severe hematologic effects, including anemia, leukopenia, and thrombocytopenia, may make this treatment less than ideal for patients with HCV. Medications to prevent or treat serious neutropenia and anemia have been established and are commonly used. However, thrombocytopenia remains a barrier to the effective treatment of HCV infection in some patients. Developing a more effective treatment for thrombocytopenia for these patients would decrease the risk of serious bleeding events. It may also improve HCV treatment outcomes by preventing dose modifications or discontinuations of peginterferon alfa-2 and ribavirin due to thrombocytopenia.

Anti-D is an antibody to the Rh (D) antigen on red blood cells. When anti-D attaches to the Rh (D) antigen, immune-mediated destruction of platelets is prevented, helping to alleviate low platelet levels in people with thrombocytopenia. This study will investigate the safety and efficacy of anti-D for the treatment of thrombocytopenia in HCV patients currently on or starting standard HCV treatment. Both HIV infected and uninfected participants will be recruited for this study.

This study will last 12 weeks. Participants in this study must be either currently on peginterferon alfa-2 and ribavirin treatment or initiating such treatment at the start of the study; these two medications will not be provided by the study. At study entry, participants will be given anti-D over a 30-minute infusion in an outpatient setting. Participants will be observed for any adverse effects for 1 hour postinfusion. Some participants may require additional doses of anti-D later in the study, depending on individual response to the drug; participants may receive 1 to 6 doses of anti-D. Efficacy of anti-D treatment will be assessed by absolute change in platelet count and the ability to sustain plaletet counts greater than 50,000 cells/microL during the study. Cytokine levels will also be monitored to gain insight on how anti-D may work with cytokines in platelet survival and clearance.

Generally, study visits will occur at study entry and Weeks 1, 2, 4, 8, and 12. In patients who require additional infusions of anti-D, there will be additional visits scheduled for each additional infusion and a postinfusion visit occurring 1 week after each infusion. All study visits will include medication history and blood collection. A clinical assessment and a targeted physical exam will occur at study entry, Weeks 1 and 12, and at additional infusion and postinfusion visits, if applicable.