OnCo
drugsProductNot mapped hereapproved

Pacritinib

The JAK inhibitor for myelofibrosis patients whose platelet counts are too low for ruxolitinib.

PERSIST-2 showed spleen and symptom responses in patients with platelets <100×10⁹/L, including <50; accelerated approval 2022 for platelets below 50. ACVR1 inhibition may improve anaemia. PACIFICA is the confirmatory trial.

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Pacritinib
PubChem
Modality
Small-molecule JAK2/IRAK1/ACVR1 inhibitor
Mechanism
Inhibits JAK2 and FLT3 while sparing JAK1, plus IRAK1 and ACVR1 (hepcidin pathway), allowing use with very low platelets.
Brand / code
Vonjo
Medicare
Part D (self-administered)

Oral, self-administered, so it is a Part D drug: covered through a stand-alone Part D plan or Medicare Advantage drug benefit, usually on the specialty tier with 25 to 33% coinsurance until the annual cap ($2,000 in 2025, $2,100 in 2026).

Commercial insurance
covered with prior authorisation

Covered for FDA-labelled and NCCN-listed uses, but almost always behind prior authorisation confirming diagnosis, biomarker and line of therapy; dispensed through a specialty pharmacy. Platelet count below 50,000 documented, per the label.

Part D out-of-pocket capped at $2,000 (2025) / $2,100 (2026). Medicare patients cannot use manufacturer co-pay cards; charity funds (PAN, HealthWell, CancerCare) and the Extra Help subsidy are the routes.

Sources: Medicare.gov: Drug coverage (Part D) · Medicare.gov: Costs for Medicare drug coverage (annual out-of-pocket cap). Not medical or financial advice; verify with your plan.

Not appraisedSearch NICE
Notes
No UK marketing authorisation as of September 2026, so no NICE appraisal. Access only through a clinical trial or a company early access scheme.
NHS England
Not routinely funded

Sources: NICE search: pacritinib. Funding decisions are indication-specific and change monthly; verify with NICE and your treating team.

Regulatory

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Approvals

RegionYearIndication
US2022Intermediate/high-risk myelofibrosis with platelets <50×10⁹/L

Trials

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ClinicalTrials.gov · phase 2/3
refreshed 2026-09-09
32 studies12 recruiting29 Phase 23 Phase 3
Search “Pacritinib” on ClinicalTrials.gov →
Counts are from a name search and may include unrelated studies; up to 100 studies are summarised.

Recruiting now (live from ClinicalTrials.gov)

Recruiting trials near you · live from ClinicalTrials.gov
Pacritinib
intervention: Pacritinib
Open on ClinicalTrials.gov →

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Key papers

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Latest papers

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Latest papers · live from Europe PMC
Open in Europe PMC

Query for this drug: (TITLE:"Pacritinib" OR ABSTRACT:"Pacritinib" OR TITLE:"Vonjo" OR ABSTRACT:"Vonjo") AND (cancer OR tumor OR tumour OR oncology OR carcinoma OR lymphoma OR leukemia OR leukaemia OR myeloma OR sarcoma OR melanoma OR glioma). Results are unfiltered search hits about Pacritinib, not a curated reading list.

Connected

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