RESPONSE ORIENTED MAINTENANCE THERAPY IN ADVANCED FOLLICULAR LYMPHOMA. RESULTS OF THE INTERIM ANALYSIS OF THE FOLL12 TRIAL CONDUCTED BY THE FONDAZIONE ITALIANA LINFOMI. 15th International Conference on Malignant Lymphoma Palazzo dei Congressi Lugano Switzerland 2019‐06‐18 to 2019‐06‐22 - Federico, M MD; Versari, A; Ferrero, S (2019)