RESUMO
We conducted a phase 1 study evaluating 3 dose levels of quizartinib (30â¯mg, 40â¯mg or 60â¯mg) in combination with azacitidine for HMA-naïve or relapsed/refractory MDS or MDS/MPN with FLT3 or CBL mutations. Overall, 12 patients (HMA naïve: n=9, HMA failure: n=3) were enrolled; 7 (58â¯%) patients had FLT3 mutations and 5 (42â¯%) had CBL mutations. The maximum tolerated dose was not reached. Most common grade 3-4 treatment-emergent adverse events were thrombocytopenia (n=5, 42â¯%), anemia (n=4, 33â¯%), lung infection (n=2, 17â¯%), skin infection (n=2, 17â¯%), hyponatremia (n=2, 17â¯%) and sepsis (n=2, 17â¯%). The overall response rate was 83â¯% with median relapse-free and overall survivals of 15.1 months (95â¯% CI 0.0-38.4 months) and 17.5 months (95â¯% CI NC-NC), respectively. FLT3 mutation clearance was observed in 57â¯% (n=4) patients. These data suggest quizartinib is safe and shows encouraging activity in FLT3-mutated MDS and MDS/MPN. This study is registered at Clinicaltrials.gov as NCT04493138.