Approximately 400 patients who completed Study ISEE2008 (GATHER2) through the Month 24 visit on study treatment (either avacincaptad pegol or Sham) and consent to participate will be administered monthly avacincaptad pegol 2 mg from Month 1 through Month 17 (maximum 17 total doses); or until avacincaptad pegol is commercially available. All patients will have a final follow up visit at Month 18.
Patients who completed Study ISEE2008 (GATHER2) and consent to participate will be administered monthly avacincaptad pegol 2 mg.