The purpose of this randomized, two-arm, open-label expansion phase study is to collect preliminary efficacy data of panobinostat at the recommended phase II dose (RPIID) level in combination with azacytidine (5-Aza) versus an active control arm 5-Aza alone. This randomized phase II part allows also collecting safety data of panobinostat in combination with 5-Aza in comparison to single-agent 5-aza.