Primary Objective- To evaluate the safety and tolerability of XL019 as a single agent when orally administered once daily (qd) or once every Monday, Wednesday, and Friday (qMWF) in subjects with PMF, post-PV MF, or post-ET MF.
- To determine the maximum tolerated dose (MTD) and or a CAD at a sub-MTD level that has demonstrated clinical response for XL019, as well as the DLTs for XL019 when orally administered qd or qMWF in subjects with PMF, post-PV MF, or post-ET MF
Secondary objectives:
- To determine the plasma pharmacokinetics (PK) and estimate renal elimination of XL019 and its putative metabolite EXEL-5887 when XL019 is orally administered once daily (QD) or once every Monday, Wednesday, and Friday or qMWF in subjects with PMF, post-PV MF, or post-ET MF.
- To evaluate the pharmacodynamic correlates of XL019 activity in peripheral blood and bone marrow in subjects with PMF, post-PV MF, or post-ET MF.
- To evaluate the long-term safety and tolerability of XL019 as a single agent when orally administered qd or qMWF in 28-day cycles
in subjects with PMF, post-PV MF, or post-ET MF. - To evaluate preliminary efficacy of XL019 as a single agent when orally administered qd or qMWF in 28-day cycles in subjects with PMF, post-PV MF, or post-ET MF based on the following endpoints: (i) response rate (hematologic, cytogenetic, bone marrow fibrosis); (ii) reduction in splenomegaly and/or hepatomegaly; (iii) time to response; (iv) duration of response; (v) reduction in JAK2-V617F allele burden; (vi) transfusion dependence; and (vii) impact on quality of life (QOL); and (viii) impact on functional exercise capacity.
- To evaluate the correlation between changes in portal hypertension and XL019 treatment in subjects with PMF, post-PV MF, or post-ET MF.
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