1. Phase I First-in-Human Dose Escalation Study of the oral SF3B1 modulator H3B-8800 in myeloid neoplasms.
- Author
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Steensma, David, Wermke, Martin, Klimek, Virginia, Greenberg, Peter, Font, Patricia, Komrokji, Rami, Yang, Jay, Brunner, Andrew, Carraway, Hetty, Ades, Lionel, Al-Kali, Aref, Alonso-Dominguez, Juan, Alfonso-Piérola, Ana, Coombs, Catherine, Deeg, H, Flinn, Ian, Foran, James, Garcia-Manero, Guillermo, Maris, Michael, McMasters, Malgorzata, Micol, Jean-Baptiste, De Oteyza, Jaime, Thol, Felicitas, Wang, Eunice, Watts, Justin, Taylor, Justin, Stone, Richard, Gourineni, Vikram, Marino, Alyssa, Yao, Huilan, Destenaves, Benoit, Yuan, Xiaobin, Yu, Kun, Dar, Sara, Ohanjanian, Lernik, Kuida, Keisuke, Xiao, Jianjun, Scholz, Catherine, Gualberto, Antonio, and Platzbecker, Uwe
- Subjects
Administration ,Oral ,Aged ,Aged ,80 and over ,Biomarkers ,Tumor ,Dose-Response Relationship ,Drug ,Female ,Humans ,Leukemia ,Myeloid ,Acute ,Male ,Middle Aged ,Mutation ,Missense ,Myelodysplastic Syndromes ,Patient Safety ,Phosphoproteins ,Piperazines ,Pyridines ,RNA Splicing Factors ,Treatment Outcome - Abstract
We conducted a phase I clinical trial of H3B-8800, an oral small molecule that binds Splicing Factor 3B1 (SF3B1), in patients with MDS, CMML, or AML. Among 84 enrolled patients (42 MDS, 4 CMML and 38 AML), 62 were red blood cell (RBC) transfusion dependent at study entry. Dose escalation cohorts examined two once-daily dosing regimens: schedule I (5 days on/9 days off, range of doses studied 1-40 mg, n = 65) and schedule II (21 days on/7 days off, 7-20 mg, n = 19); 27 patients received treatment for ≥180 days. The most common treatment-related, treatment-emergent adverse events included diarrhea, nausea, fatigue, and vomiting. No complete or partial responses meeting IWG criteria were observed; however, RBC transfusion free intervals >56 days were observed in nine patients who were transfusion dependent at study entry (15%). Of 15 MDS patients with missense SF3B1 mutations, five experienced RBC transfusion independence (TI). Elevated pre-treatment expression of aberrant transcripts of Transmembrane Protein 14C (TMEM14C), an SF3B1 splicing target encoding a mitochondrial porphyrin transporter, was observed in MDS patients experiencing RBC TI. In summary, H3B-8800 treatment was associated with mostly low-grade TAEs and induced RBC TI in a biomarker-defined subset of MDS.
- Published
- 2021