S221: LONG-TERM RESULTS OF THE FIL MCL0208 TRIAL COMPARING LENALIDOMIDE MAINTENANCE (LEN) VS OBSERVATION (OBS) AFTER AUTOLOGOUS STEM CELL TRANSPLANTATION (ASCT) IN MANTLE CELL LYMPHOMA (MCL) - Marco Ladetto; Rita Tavarozzi; Andrea Evangelista; Elisa Genuardi; Daniela Drandi; Michael Mian; Manuela Zanni; Federica Cavallo; Alice DI Rocco; Vittorio Stefoni; Chiara Pagani; Alessandro Re; et al. (HemaSphere, 2023)