Influence of GVHD survival and event-free survival. Kaplan-Meier estimated probability of survival (A) and event-free survival (B) is displayed for patients who developed grades 0 to 1 and 2 to 4 GVHD. Event-free survival is somewhat lower for patients with a history of grades 2 to 4 GVHD (logrank, P = .08)