EP2049109A2 - COMBINED USE OF (+)-1,4-DIHYDRO-7-[(3S,4S)-3-METHOXY-4-(METHYLAMINO)-1-PYRROLIDINYL]-4-OXO-1-(2-THIAZOLYL)-1,8-NAPHTHYRIDINE-3-CARBOXYLIC ACID AND CYTARABINE (ARA-C) FOR THE TREATMENT OF LEUKEMIA