The number of participants who experienced composite efficacy failure was analyzed. Composite efficacy failure was defined as treated biopsy proven acute rejection (tBPAR), graft loss, or death. A BPAR was defined as an acute rejection confirmed by biopsy with a Rejection Activity Index (RAI) score ≥ 3. tBPAR was defined as a BPAR which was treated with anti-rejection therapy. The RAI is used to score liver biopsies with acute rejection and is composed of 3 categories (portal inflammation, bile duct inflammation damage, and venous endothelial inflammation) each scored on a scale of 0 (absent) to 3 (severe) by a trained pathologist. The total RAI score = the sum of the scores of the 3 categories and ranges from 0 to 9, with a higher score indicating greater rejection. The graft was presumed to be lost on the day the patient was newly listed for a liver graft, received a graft re-transplant, or died.