P583: PATIENTS AT HIGH RISK OF RELAPSE POST-TRANSPLANT: A PHASE 1 STUDY DESIGN WITH A NOVEL TREATMENT STRATEGY USING THE ESTIMAND FRAMEWORK. (23rd June 2022) - Zeiser, R.; Schmid, C.; Al-Atrash, G.; Xu, Y.; Weber, H.-J.; Eldjerou, L.; Weber, S.; Widmer, L.; Craddock, C.