Study to Assess Efficacy and Safety of NS-018 Compared to BAT in Patients With Myelofibrosis

Inclusion Criteria:

• Primary MF, post-PVMF or post-ETMF according to the DIPSS risk categories ofintermediate-2 or high-risk MF

• Average platelet count of <50,000/µL at Screening based on 2 measurements taken ondifferent days; both measurements must be <50,000/µL.

• ECOG performance status ≤2.

• Life expectancy >6 months.

• Spleen volume of at least 450 cm3 measured by MRI (or by CT for applicablesubjects).

• Total Symptom Score (TSS) ≥10 on the Myelofibrosis Symptom Assessment Form (MFSAF)version 4.0.

• Peripheral blast count <10%.

• No MF-directed treatment for at least 2 weeks prior to initiation of NS-018,including JAK inhibitor, erythropoietic, thrombopoietic agent, or any use ofcorticosteroids for MF symptom or blood count management. Low dose corticosteroids <10 mg/day prednisone or equivalent is allowed for non-MF purposes.

Exclusion Criteria:

• Active, uncontrolled systemic infection.

• Any prior treatment with more than two JAK inhibitors.

• Previous treatment with NS-018.

• Subjects actively receiving a concurrent investigational agent.

• Subjects with any unresolved AE greater than Grade 1 other than hematological AEsfrom previous anticancer therapy.

• Currently taking medication that is substantially metabolized by cytochrome P450 (CYP) 1A2 or CYP3A4 (see Appendix 5) or taking medication known to be stronginhibitors or inducers of CYP3A4 (see Appendix 5).

• Radiation therapy for splenomegaly within 6 months prior to study entry (screening).

• History of splenectomy or planning to undergo splenectomy.

• Subjects with a serious cardiac condition within the past 6 months such asuncontrolled arrhythmias, myocardial infarction, angina or heart disease

• Subjects diagnosed with another malignancy within 2 years prior to an enrollment.

• Subjects who have had surgery (other than placement of vascular access and bonemarrow biopsy) within 4 weeks of study entry (screening), or subjects withincomplete recovery from any prior surgical procedures.