Pacritinib

drug
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Also known as ONX-0803Sb-1518SB1518PACRITINIB (SB1518)

Summary

Pacritinib (CHEMBL2035187) is an approved small-molecule EC 2.7.10.2 (non-specific protein-tyrosine kinase) inhibitor (ATC L01EJ03) targeting FLT3, JAK1, and JAK2; indicated across 19 conditions including neoplasm and primary myelofibrosis; with CIViC clinical evidence for 6 variant-indication associations (e.g. FLT3 ITD in acute myeloid leukemia).

At a glance

  • Status: Approved (max clinical phase 4)
  • Modality: Small molecule
  • ATC class: L01EJ03
  • Targets: 4 (FLT3, JAK1, JAK2…)
  • Indications: 19 conditions
  • Clinical trials: 51
  • Precision-oncology evidence (CIViC): 6 variant–indication associations
  • Chemistry: 472.6 Da · C28H32N4O3

Identifiers

Drug identity and classification

FieldValue
ChEMBL IDCHEMBL2035187
NamePacritinib
TypeSmall molecule
Max phase4
FDA approvedyes
PubChem CID46216796
ChEBICHEBI:231350
ATCL01EJ03
Molecular formulaC28H32N4O3
Molecular weight472.6
InChIKeyHWXVIOGONBBTBY-ONEGZZNKSA-N

SMILES: C1CCN(C1)CCOC2=C3COC/C=C/COCC4=CC(=CC=C4)C5=NC(=NC=C5)NC(=C3)C=C2

IUPAC name: (16E)-11-(2-pyrrolidin-1-ylethoxy)-14,19-dioxa-5,7,27-triazatetracyclo[19.3.1.12,6.18,12]heptacosa-1(24),2(27),3,5,8(26),9,11,16,21(25),22-decaene

ChEBI definition: An azamacrocycle with formula C28H32N4O3. It is a Janus kinase inhibitor and its citrate salt is approved for the treatment of intermediate or high risk, primary or secondary myelofibrosis.

Pharmacological roles (ChEBI): EC 2.7.10.2 (non-specific protein-tyrosine kinase) inhibitor, antineoplastic agent, apoptosis inducer, anti-inflammatory agent.

Also known as: ONX-0803, Pacritinib, Sb-1518, SB-1518, SB1518, pacritinib, PACRITINIB, PACRITINIB (SB1518), Pacritinib (SB1518)

Parent form; salt/anhydrous children: CHEMBL5095049

Patent coverage: 1,313 distinct patent families (3,345 SureChEMBL compound mentions), from 6 matched compound structure(s). One matched structure accounts for 3,220 (96%) of the total. Mentions count patents naming the compound (not distinct inventions), so promiscuous / reference molecules inflate the mention figure — families are the dedup metric.

Targets

Targets

Primary targets (GtoPdb curated mechanism): the Cancer dependency column is the DepMap CRISPR fitness signal (% of screened cell lines dependent on the target).

GeneTargetActionpAffinityCancer dependencyUniProt
FLT3fms related receptor tyrosine kinase 3Inhibition7.660.9%P36888
JAK1Janus kinase 1Inhibition5.892.8%P23458
JAK2Janus kinase 2Inhibition7.640.7%O60674
JAK3Janus kinase 3Inhibition6.280.6%P52333

Broader ChEMBL bioactivity targets: 51 (assay-derived). Sample: Serine/threonine-protein kinase TAO2, Serine/threonine-protein kinase ICK, Tyrosine-protein kinase JAK2, Macrophage colony-stimulating factor 1 receptor, Platelet-derived growth factor receptor beta, Receptor-type tyrosine-protein kinase FLT3, Cyclin-dependent kinase 2/cyclin A, Tyrosine-protein kinase JAK3, Aurora kinase B, Mitogen-activated protein kinase 8.

Bioactivity

ChEMBL activities: 107 potent at pChembl ≥ 5 of 111 total. Top 30 by potency (10 = 0.1 nM, 6 = 1 µM):

TargetpChemblTypeValueUnitActivity ID
JAK29IC501nMCHEMBL_ACT_16844229
STK118.52Kd3nMCHEMBL_ACT_17940797
NQO28.4Kd4nMCHEMBL_ACT_17922432
FLT38.22IC506nMCHEMBL_ACT_12151323
JAK28.22IC506nMCHEMBL_ACT_24975332
FLT38.22IC506nMCHEMBL_ACT_26312576
FLT38.22IC506nMCHEMBL_ACT_26327143
FLT38.19IC506.4nMCHEMBL_ACT_24975318
JAK28.18Kd6.6nMCHEMBL_ACT_25839816
FLT38.1IC508nMCHEMBL_ACT_26327153
JAK28.05Kd8.9nMCHEMBL_ACT_25839917
FLT37.92IC5012nMCHEMBL_ACT_24975333
JAK27.85IC5014nMCHEMBL_ACT_25839856
JAK37.74IC5018.3nMCHEMBL_ACT_24975331
FLT37.74IC5018.3nMCHEMBL_ACT_24975334
JAK27.72IC5019nMCHEMBL_ACT_12151324
JAK27.72IC5019nMCHEMBL_ACT_26312572
FLT37.7IC5020nMCHEMBL_ACT_26327150
FLT37.66IC5022nMCHEMBL_ACT_12151360
ACVR17.66Kd22nMCHEMBL_ACT_17880654
JAK27.66IC5022nMCHEMBL_ACT_19067279
FLT37.66IC5022nMCHEMBL_ACT_24862940
FLT37.66IC5022nMCHEMBL_ACT_25683705
FLT37.66IC5022nMCHEMBL_ACT_26123576
FLT37.66IC5022nMCHEMBL_ACT_26312575
FLT37.66IC5022nMCHEMBL_ACT_26327142
FLT37.66IC5022nMCHEMBL_ACT_29252829
JAK27.64IC5023nMCHEMBL_ACT_12153235
FLT37.64IC5023nMCHEMBL_ACT_19067278
JAK27.64IC5023nMCHEMBL_ACT_24788502

Target pathways

Aggregated over 4 target gene(s): FLT3, JAK1, JAK2, JAK3.

Top Reactome pathways

111 total, by targets touching each:

PathwayTargetsGenes
RAF/MAP kinase cascade4FLT3, JAK1, JAK2, JAK3
Cytokine Signaling in Immune system3JAK1, JAK2, JAK3
Signal Transduction3JAK1, JAK2, JAK3
Disease3JAK1, JAK2, JAK3
Immune System3JAK1, JAK2, JAK3
Signaling by Interleukins3JAK1, JAK2, JAK3
Interleukin-2 family signaling3JAK1, JAK2, JAK3
Interleukin-3, Interleukin-5 and GM-CSF signaling3JAK1, JAK2, JAK3
Infectious disease3JAK1, JAK2, JAK3
MAPK family signaling cascades3JAK1, JAK2, JAK3
MAPK1/MAPK3 signaling3JAK1, JAK2, JAK3
Interleukin-4 and Interleukin-13 signaling3JAK1, JAK2, JAK3
Interleukin-20 family signaling3JAK1, JAK2, JAK3
Interleukin receptor SHC signaling3JAK1, JAK2, JAK3
Potential therapeutics for SARS3JAK1, JAK2, JAK3
SARS-CoV Infections3JAK1, JAK2, JAK3
Viral Infection Pathways3JAK1, JAK2, JAK3
Interleukin-6 signaling2JAK1, JAK2
MAPK3 (ERK1) activation2JAK1, JAK2
RAF-independent MAPK1/3 activation2JAK1, JAK2
MAPK1 (ERK2) activation2JAK1, JAK2
Interleukin-7 signaling2JAK1, JAK3
Interleukin-12 family signaling2JAK1, JAK2
Interleukin-6 family signaling2JAK1, JAK2
IL-6-type cytokine receptor ligand interactions2JAK1, JAK2
Interferon gamma signaling2JAK1, JAK2
Regulation of IFNG signaling2JAK1, JAK2
Interleukin-15 signaling2JAK1, JAK3
Interleukin-35 Signalling2JAK1, JAK2
Interleukin-9 signaling2JAK1, JAK3

Dominant GO biological processes

GO termTargets
cytokine-mediated signaling pathway4
protein phosphorylation4
regulation of apoptotic process3
cell surface receptor signaling pathway via JAK-STAT3
cell differentiation3
intracellular signal transduction3
growth hormone receptor signaling pathway via JAK-STAT3
regulation of cell-cell adhesion3
positive regulation of cell population proliferation2
B cell differentiation2
positive regulation of tyrosine phosphorylation of STAT protein2
positive regulation of MAPK cascade2
protein autophosphorylation2
positive regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction2
interleukin-15-mediated signaling pathway2

Indications & clinical

Indications

19 indications (1 at ChEMBL trial phase 4). Phase below is the highest clinical-trial phase recorded for this drug against each disease — not the molecule’s overall approval status (that is in the Summary).

IndicationTrial phaseMONDOEFO
neoplasm4MONDO:0005070EFO:0000616
primary myelofibrosis2MONDO:0009692EFO:0002430
leukemia2MONDO:0005059EFO:0000565
Hodgkins lymphoma2MONDO:0004952EFO:0000183
acute myeloid leukemia2MONDO:0018874EFO:0000222
mantle cell lymphoma2MONDO:0018876EFO:1001469
severe acute respiratory syndrome2MONDO:0005091MONDO:0100096
lymphoma2MONDO:0005062EFO:0000574
colorectal neoplasm2MONDO:0005335MONDO:0005575
B-cell chronic lymphocytic leukemia1MONDO:0004948EFO:0000095
non-small cell lung carcinoma1MONDO:0005233EFO:0003060
graft versus host disease1MONDO:0013730MONDO:0013730
breast neoplasm1MONDO:0021100MONDO:0007254
liver disorder1MONDO:0005154EFO:0001421
myelodysplastic syndrome1MONDO:0018881EFO:0000198
chronic myelomonocytic leukemia1MONDO:0020311MONDO:0020311

3 further indication records had no mapped disease name (EFO/MeSH-only) or were duplicates, and are omitted.

Clinical trials

Total trials: 51.

Phase distribution

PhaseTrials
PHASE223
PHASE114
PHASE1/PHASE210
PHASE33
EARLY_PHASE11

Top trials by phase / activity

NCTPhaseStatusTitle
NCT03165734PHASE3ACTIVE_NOT_RECRUITINGA Phase 3 Study of Pacritinib in Patients With Primary Myelofibrosis, Post Polycythemia Vera Myelofibrosis, or Post-Essential Thrombocythemia Myelofibrosis
NCT01773187PHASE3TERMINATEDPacritinib Versus Best Available Therapy to Treat Myelofibrosis
NCT02055781PHASE3TERMINATEDPacritinib Versus Best Available Therapy to Treat Patients With Myelofibrosis and Thrombocytopenia
NCT03645824PHASE2ACTIVE_NOT_RECRUITINGMyelofibrosis Treated With Pacritinib Before aSCT. (HOVON134MF)
NCT04282187PHASE2RECRUITINGDecitabine With Ruxolitinib, Fedratinib or Pacritinib for the Treatment of Accelerated/Blast Phase Myeloproliferative Neoplasms
NCT04520269PHASE1/PHASE2ACTIVE_NOT_RECRUITINGA Single Arm, Phase Ib/II Trial of Single Agent Pacritinib in Patients With 1q21.3 Amplified Solid Tumors Enriching for Interleukin-1 Receptor-associated Kinase 1 Pathway Activation (PAIR)
NCT04858256PHASE2RECRUITINGPacritinib in Relapsed/Refractory T-cell Lymphoproliferative Neoplasms
NCT05531786PHASE1/PHASE2RECRUITINGPhase I/II Study of Pacritinib, A JAK2/IRAK1/CSF1R Inhibitor, in Refractory Chronic Graft-Versus-Host Disease (cGVHD) After Allogeneic Hematopoietic Stem Cell Transplantation (HSCT)
NCT05980806PHASE2RECRUITINGA Study of Selinexor Monotherapy in Subjects With JAK Inhibitor-naïve Myelofibrosis and Moderate Thrombocytopenia
NCT06052618PHASE2RECRUITINGPhase II Study of Pacritinib in Kaposi Sarcoma Herpesvirus (KSHV)-Associated Multicentric Castleman Disease and KSHV-Associated Inflammatory Cytokine Syndrome (KICS)
NCT06159491PHASE1/PHASE2RECRUITINGPacritinib in CMML
NCT06303193PHASE1/PHASE2RECRUITINGPacritinib, a Kinase Inhibitor of CSF1R, IRAK1, JAK2, and FLT3, in Adults and Pediatric Participants 12 Years of Age or Older With Myelodysplastic Syndromes or Myelodysplastic/Myeloproliferative Neoplasms
NCT06782373PHASE2RECRUITINGA Study to Assess the Effectiveness and Safety of Pacritinib in Patients With VEXAS Syndrome (PAXIS)
NCT06986174PHASE2RECRUITINGA Phase 2 Study to Evaluate the Safety and Efficacy of Pacritinib in Relapsed or Refractory Waldenström Macroglobulinemia
NCT07033598PHASE2RECRUITINGPacritinib vs. Hydroxyurea in Advanced Proliferative Chronic Myelomonocytic Leukemia
NCT07148947PHASE2RECRUITINGPacritinib With Standard of Care Azacitidine or Decitabine as a Bridge to Allogeneic Hematopoietic Stem Cell Transplant for Patients With Accelerated and Blast Phase Myeloproliferative Neoplasms
NCT07226713PHASE2NOT_YET_RECRUITINGPacritinib in Participants With Metastatic Castrate-Resistant Prostate Cancer That Progressed on or After Prior Treatment With Androgen Receptor Signaling Inhibitors
NCT07387354PHASE1/PHASE2NOT_YET_RECRUITINGPacritinib With Aza for Upfront Myelodysplastic Syndrome
NCT07394153PHASE2RECRUITINGPacritinib For Bone Marrow Fibrosis In Patients With Myelofibrosis Who Have Thrombocytopenia
NCT07447817PHASE2NOT_YET_RECRUITINGSelinexor and Pacritinib in JAK Inhibitor-naïve MF Patients With Cytopenias
NCT00719836PHASE1/PHASE2COMPLETEDA Phase 1/2 Study of SB1518 for the Treatment of Advanced Myeloid Malignancies
NCT00745550PHASE1/PHASE2COMPLETEDA Phase 1/2 Study of Oral SB1518 in Subjects With Chronic Idiopathic Myelofibrosis
NCT01263899PHASE2COMPLETEDA Safety and Efficacy Study of SB1518 for the Treatment of Advanced Lymphoid Malignancies
NCT01436084PHASE2TERMINATEDSB1518 for Patients With Myelodysplastic Syndrome (MDS)
NCT01620216PHASE2TERMINATEDTargeted Therapy in Treating Patients With Relapsed or Refractory Acute Lymphoblastic Leukemia or Acute Myelogenous Leukemia
NCT02277093PHASE2TERMINATEDPacritinib to Inhibit JAK/STAT Signaling in Refractory Colorectal Cancer
NCT02410551PHASE2TERMINATEDPacritinib Before Transplant for Myeloproliferative Neoplasms (MPN)
NCT02469415PHASE2TERMINATEDPacritinib for Patients With Lower-Risk Myelodysplastic Syndromes (MDS)
NCT02532010PHASE2TERMINATEDPacritinib Combined With Decitabine or Cytarabine in Older Patients With AML
NCT02584777PHASE2WITHDRAWNA Phase II Non-Controlled, Open-Label, Efficacy, Safety, Pharmacokinetic, and Pharmacodynamic Study of Pacritinib in Myelofibrosis
NCT02677948PHASE1/PHASE2WITHDRAWNMulticenter Study of Pacritinib Combined With Ibrutinib in Relapsed/Refractory Chronic Lymphocytic Leukemia/Small Lymphocytic Lymphoma (CLL/SLL)
NCT02891603PHASE1/PHASE2COMPLETEDA Phase I/II GVHD Prevention Trial Combining Pacritinib With Sirolimus-Based Immune Suppression
NCT04404361PHASE2TERMINATEDPRE-VENT Study in Hospitalized Patients With Severe COVID-19 With or Without Cancer
NCT04635059PHASE2TERMINATEDPacritinib for Biochemical Relapse After Definitive Treatment for Prostate Cancer
NCT04884191PHASE2COMPLETEDPhase 2 Study: An Open-Label, Randomized, Phase 2 Dose-Finding Study of Pacritinib in Patients With Primary Myelofibrosis, Post-Polycythemia Vera Myelofibrosis, or Post- Essential Thrombocythemia Myelofibrosis Previously Treated With Ruxolitinib
NCT06516887PHASE1/PHASE2TERMINATEDStudy of Bemcentinib Plus Pacritinib In Patients With Advanced Lung Adenocarcinoma
NCT06218628PHASE1RECRUITINGPacritinib w/ Talazoparib in Pts w/ Myeloproliferative Neoplasms Unresponsive to JAK2 Inhibition
NCT06538181PHASE1RECRUITINGPacritinib in Vacuoles, E1 Ubiqutin-activating Enzyme, X-linked, Autoinflammatory, Somatic (VEXAS) Syndrome
NCT06675123PHASE1RECRUITINGPacritinib in Combination With a BTK Inhibitor for the Treatment of Patients With Relapsed or Refractory Mantle Cell Lymphoma
NCT00741871PHASE1COMPLETEDA Phase 1 Study of SB1518 for the Treatment of Advanced Lymphoid Malignancies

Clinical evidence (CIViC)

Variant × indication × effect (6 predictive associations from 6 curated evidence items):

VariantIndicationEffectTherapyLevelCIViC
FLT3 ITDAcute Myeloid LeukemiaSensitivity/ResponsePacritinibCIViC BEID9217
EGFR G598VGlioblastomaSensitivity/ResponsePacritinib + AfatinibCIViC DEID8235
EGFR G598VGlioblastomaSensitivity/ResponseErlotinib + PacritinibCIViC DEID8236
EGFR G598VGlioblastomaSensitivity/ResponsePacritinib + LapatinibCIViC DEID8261
EGFR G598VGlioblastomaSensitivity/ResponsePacritinib + OsimertinibCIViC DEID8284
EGFR VIIIGlioblastomaSensitivity/ResponsePacritinib + AfatinibCIViC DEID8192

Pharmacology

Pharmacogenomics

No PharmGKB pharmacogenomic data curated for this drug.

Molecules sharing ≥1 of this drug’s curated primary targets, merged from two biobtree sources and ranked by shared-target count, then clinical phase: ChEMBL clinical-stage candidates (development phase ≥2) and PubChem drug-class bioactivity (approved / known drugs acting on the target). Deduplicated by drug name; the drug’s own salt forms are excluded. Note: for a drug with few primary targets a shared-target match can reflect off-target / promiscuous binding rather than the same therapeutic mechanism — the phase ordering surfaces bona-fide therapeutics first.

178 molecules share ≥1 primary target. Top 60 by shared-target count:

MoleculeSourceStatusShared targets
AFATINIBChEMBL + PubChemPhase 4 (approved)FLT3, JAK1, JAK2, JAK3
CRIZOTINIBChEMBL + PubChemPhase 4 (approved)FLT3, JAK1, JAK2, JAK3
GEFITINIBChEMBL + PubChemPhase 4 (approved)FLT3, JAK1, JAK2, JAK3
PAZOPANIBChEMBL + PubChemPhase 4 (approved)FLT3, JAK1, JAK2, JAK3
CERITINIBChEMBLPhase 4 (approved)FLT3, JAK1, JAK2, JAK3
ENTRECTINIBChEMBLPhase 4 (approved)FLT3, JAK1, JAK2, JAK3
FEDRATINIBChEMBLPhase 4 (approved)FLT3, JAK1, JAK2, JAK3
FILGOTINIBChEMBLPhase 4 (approved)FLT3, JAK1, JAK2, JAK3
MIDOSTAURINChEMBLPhase 4 (approved)FLT3, JAK1, JAK2, JAK3
NINTEDANIBChEMBLPhase 4 (approved)FLT3, JAK1, JAK2, JAK3
SUNITINIBChEMBLPhase 4 (approved)FLT3, JAK1, JAK2, JAK3
DOVITINIBChEMBLPhase 3FLT3, JAK1, JAK2, JAK3
LESTAURTINIBChEMBLPhase 3FLT3, JAK1, JAK2, JAK3
AT-9283ChEMBLPhase 2FLT3, JAK1, JAK2, JAK3
AZD-1480ChEMBLPhase 2FLT3, JAK1, JAK2, JAK3
CERDULATINIBChEMBLPhase 2FLT3, JAK1, JAK2, JAK3
R-406ChEMBLPhase 2FLT3, JAK1, JAK2, JAK3
SU-014813ChEMBLPhase 2FLT3, JAK1, JAK2, JAK3
TOZASERTIBChEMBLPhase 2FLT3, JAK1, JAK2, JAK3
IdelalisibPubChemApprovedFLT3, JAK1, JAK2, JAK3
SelumetinibPubChemApprovedFLT3, JAK1, JAK2, JAK3
dacomitinibChEMBL + PubChemPhase 4 (approved)FLT3, JAK1, JAK3
DEUCRAVACITINIBChEMBL + PubChemPhase 4 (approved)JAK1, JAK2, JAK3
FOSTAMATINIBChEMBL + PubChemPhase 4 (approved)FLT3, JAK1, JAK2
IMATINIBChEMBL + PubChemPhase 4 (approved)FLT3, JAK1, JAK2
RITLECITINIBChEMBL + PubChemPhase 4 (approved)JAK1, JAK2, JAK3
ABROCITINIBChEMBLPhase 4 (approved)JAK1, JAK2, JAK3
AXITINIBChEMBLPhase 4 (approved)FLT3, JAK2, JAK3
BARICITINIBChEMBLPhase 4 (approved)JAK1, JAK2, JAK3
BOSUTINIBChEMBLPhase 4 (approved)FLT3, JAK2, JAK3
DASATINIBChEMBLPhase 4 (approved)FLT3, JAK2, JAK3
ERLOTINIBChEMBLPhase 4 (approved)FLT3, JAK2, JAK3
MOMELOTINIBChEMBLPhase 4 (approved)JAK1, JAK2, JAK3
PEFICITINIBChEMBLPhase 4 (approved)JAK1, JAK2, JAK3
PONATINIBChEMBLPhase 4 (approved)FLT3, JAK1, JAK2
RUXOLITINIBChEMBLPhase 4 (approved)JAK1, JAK2, JAK3
TOFACITINIBChEMBLPhase 4 (approved)JAK1, JAK2, JAK3
UPADACITINIBChEMBLPhase 4 (approved)JAK1, JAK2, JAK3
ABIVERTINIBChEMBLPhase 3JAK1, JAK2, JAK3
ALVOCIDIBChEMBLPhase 3FLT3, JAK2, JAK3
BREPOCITINIBChEMBLPhase 3JAK1, JAK2, JAK3
DEFACTINIBChEMBLPhase 3FLT3, JAK2, JAK3
DELGOCITINIBChEMBLPhase 3JAK1, JAK2, JAK3
ITACITINIBChEMBLPhase 3JAK1, JAK2, JAK3
ATINVICITINIBChEMBLPhase 2JAK1, JAK2, JAK3
BMS-911543ChEMBLPhase 2JAK1, JAK2, JAK3
CC-401ChEMBLPhase 2JAK1, JAK2, JAK3
CENISERTIBChEMBLPhase 2FLT3, JAK2, JAK3
DECERNOTINIBChEMBLPhase 2JAK1, JAK2, JAK3
GANDOTINIBChEMBLPhase 2JAK1, JAK2, JAK3
GOLIDOCITINIBChEMBLPhase 2JAK1, JAK2, JAK3
GUSACITINIBChEMBLPhase 2JAK1, JAK2, JAK3
IFIDANCITINIBChEMBLPhase 2JAK1, JAK2, JAK3
IZENCITINIBChEMBLPhase 2JAK1, JAK2, JAK3
NEZULCITINIBChEMBLPhase 2JAK1, JAK2, JAK3
NS-018ChEMBLPhase 2JAK1, JAK2, JAK3
OCLACITINIBChEMBLPhase 2JAK1, JAK2, JAK3
PELITINIBChEMBLPhase 2FLT3, JAK2, JAK3
REBASTINIBChEMBLPhase 2FLT3, JAK1, JAK2
ROPSACITINIBChEMBLPhase 2JAK1, JAK2, JAK3