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- W4385667035 abstract "Topic: 16. Myeloproliferative neoplasms - Clinical Background: BET proteins are epigenetic readers that regulate expression of critical oncoproteins involved in the pathophysiology of hematologic malignancies, including MF. INCB057643 is a small-molecule BET inhibitor evaluated as monotherapy and in combination with ruxolitinib (RUX) in pts with advanced malignancies in 2 previous phase 1/2 clinical trials. Aims: To evaluate the safety and tolerability of INCB057643 in pts with R/R MF and other advanced myeloid neoplasms. Methods: In this ongoing phase 1, 3 + 3 dose-escalation/expansion study (NCT04279847), pts aged ≥18 years received INCB057643 (4 mg once daily [qd]; escalation up to 12 mg qd) as (1) monotherapy (part 1) in R/R MF, myelodysplastic syndromes (MDS), or MDS/myeloproliferative neoplasm (MPN) overlap syndromes (MDS/MPN) or (2) added to RUX (part 2) in pts with MF and suboptimal response to RUX. The primary endpoint is safety and tolerability, including identification of dose-limiting toxicities (DLTs). Results: 13 pts have been treated in part 1 (4 mg, n=6; 8 mg, n=4; 10 mg, n=1; 12 mg, n=2), and 3 pts received 4 mg + RUX in part 2 (overall age range, 50–79 years; men, n=9; study treatment duration range, 15–314 days). 12 pts had MF, and 4 had MDS/MPN. All 6 pts in the 4-mg cohort discontinued treatment (3 for progressive disease [PD]; MF, n=2; MDS/MPN, n=1); 1 pt with MF in the 12-mg cohort discontinued for thrombocytopenia. The other 9 pts remain on treatment. Thrombocytopenia was the most common treatment-emergent adverse event (TEAE; n=9; Table) and the only TEAE leading to discontinuation (n=3). Grade ≥3 TEAEs occurring in ≥1 pt were thrombocytopenia (n=4), anemia (n=3), and hypokalemia (n=2). There were 8 serious AEs across 4 pts, with only COVID-19 occurring in >1 pt (n=2); all but one (pneumonia) were considered unrelated to study treatment. There were 2 DLTs (thrombocytopenia [MDS/MPN pt] and hyperbilirubinemia [MF pt]; both 12-mg cohort) and 2 deaths (both 4-mg cohort due to PD [MF, n=1; MDS/MPN, n=1]). Summary/Conclusion: Treatment with INCB057643 monotherapy (4 and 8 mg qd) and in combination (4 mg qd) with RUX was generally well tolerated in this pt population. The 12-mg qd monotherapy dose was not tolerated and caused 2 DLTs. There were no treatment-related fatal events. Dose finding in part 1 is ongoing with 10 mg qd, after which a recommended phase 2 dose will be declared. Combination dose escalation is also ongoing. Preliminary efficacy including spleen size and symptoms will be available for presentation. Keywords: Myelofibrosis, Myeloproliferative disorder, Myelodysplastic syndrome, Epigenetic" @default.
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- W4385667035 date "2023-08-01" @default.
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- W4385667035 title "P1055: BROMODOMAIN AND EXTRA-TERMINAL (BET) INHIBITOR INCB057643 (LIMBER-103) IN PATIENTS (PTS) WITH RELAPSED OR REFRACTORY MYELOFIBROSIS (R/R MF) AND OTHER ADVANCED MYELOID NEOPLASMS: A PHASE 1 STUDY" @default.
- W4385667035 doi "https://doi.org/10.1097/01.hs9.0000971116.17929.06" @default.
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