Treatment was considered a success if all of the following conditions were met: Achieved induction of a complete response (CR) within 28 days after first infusion; CR followed by 28 days maintenance of a clinically meaningful response defined as the response that did not require an increase in corticosteroid dose (methylprednisolone doses \>2 milligram/kilogram/day \[mg/kg/d\] or prednisone doses \>2.5 mg/kg/d) for more than 7 consecutive days; Did not require second line/escalation therapy through Study Day 56; and survived 90 study days.

A complete response was defined as complete resolution of all clinical signs of Graft versus host disease (GVHD)- that had to be maintained for at least 28 consecutive days (durable complete response \[DCR\]) within 100 days post first infusion.

Responses included complete response (CR), partial response (PR), failure to respond. CR is defined as a complete resolution of graft-versus-host disease (GVHD). PR is defined as improvement in at least one organ by at least one full stage in the absence of progression in any other organ, or resolution of GVHD in at least one organ with a need for additional treatment because of abnormalities persisting in another organ. Failure to respond is defined as progression of GVHD.