RESPONSE ORIENTED MAINTENANCE THERAPY IN ADVANCED FOLLICULAR LYMPHOMA. RESULTS OF THE INTERIM ANALYSIS OF THE FOLL12 TRIAL CONDUCTED BY THE FONDAZIONE ITALIANA LINFOMI. (12th June 2019) - Federico, M.; Mannina, D.; Versari, A.; Ferrero, S.; Marcheselli, L.; Boccomini, C.; Dondi, A.; Tucci, A.; Guerra, L.; Galimberti, S.; Cavallo, F.; Olivieri, J.; et al.