Phase II study of lower-dose pracinostat plus azacitidine safety and efficacy in patients with high/very high-risk myelodysplastic syndromes
Abstract No : 7556
Abstract Type : Poster Discussion Session
Indication : HR-MDS
Intervention : Pracinostat
Company : Helsinn Healthcare SA and MEI Pharma, Inc
Technology : Small molecule
Sixty-four pts were enrolled and received ≥1 dose of treatment. Most pts were male (67%), median age was 68 years (range 47–89), and the proportion of pts with high/very high-risk MDS was similar. After 17.6 months’ median follow-up, 31% of pts remain on treatment; 69% of pts discontinued treatment due to stem cell transplant (25%), disease progression (17%), AEs (11%), consent withdrawal (3%), pt noncompliance (3%), death (3%), lost to follow-up (2%), and other (5%). Most common nonhematologic AEs were constipation (55%), nausea (52%), fatigue (45%), decreased appetite (39%), peripheral edema (36%), diarrhea, and dyspnea (31% each). Frequent hematologic AEs were decreased neutrophil count (50%), anemia (39%), decreased platelet count (38%), febrile neutropenia (36%), and thrombocytopenia (30%). ORR was 33% (95% CI 22-46), with 33% achieving CR; 34% of pts had marrow CR. Median OS was 23.5 months (95% CI 16.4-nc), with an estimated 1-year OS of 77%.
In pts with high/very high-risk MDS, a lower dose of pracinostat in combination with AZA demonstrated a tolerable safety profile and promising efficacy.
Pracinostat demonstrated potential in combination with AZA with 33% ORR (all CRs)