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JAK2
Variants
VariantGeneTypeCOSMIC IDDNA Change (Coding Nucleotide)Exon
JAK2 V617FJAK2missense14
JAK2 exon(s) 12 insertionJAK2insertion12
JAK2 exon(s) 12 deletionJAK2deletion12
JAK2 codon(s) 683 missenseJAK2missense16
JAK2 copy number gainJAK2CNV
JAK2 copy number lossJAK2CNV
JAK2 any mutationJAK2any

Interpretations

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Tier 1
JAK2
Variants
JAK2 V617F
JAK2 exon(s) 12 insertion
JAK2 exon(s) 12 deletion
JAK2 any mutation
Primary Sites
Blood
Bone Marrow
Tumor Types
Myeloproliferative Neoplasm
Essential Thrombocythemia
Primary Myelofibrosis
Polycythemia Vera
Acute Leukemia of Unspecified Cell Type
Acute Myeloid Leukemia
Anemia, Unspecified
Atypical Chronic Myeloid Leukemia
Chronic Myeloid Leukemia
Chronic Myelomonocytic Leukemia
Chronic Neutrophilic Leukemia
Cytopenia
Eosinophilia
Histiocytic and Dendritic Cell Neoplasms
Langerhans Cell Histiocytosis
Leukocytosis
Leukopenia
Mast Cell Neoplasm
MDS with Ring Sideroblasts
Monocytosis
Myelodysplastic Syndrome
Myelodysplastic/Myeloproliferative Neoplasm
Myeloid Neoplasm
Other Acute Leukemia
Polycythemia
T Lymphoblastic Leukemia/Lymphoma
Thrombocytopenia, Unspecified
Thrombocytosis
Interpretation

JAK2 is a non-receptor tyrosine kinase that mediates signaling via the JAK-STAT pathway. The somatic, activating mutation V617F in the pseudokinase domain of JAK2 has been reported in over 90% of patients with polycythemia vera, 40-70% of essential thrombocythemia, 40-60% of primary myelofibrosis and 50% of MDS/MPN with Ring Sideroblasts and Thrombocytosis. JAK2 mutations have also been reported in CHIP. The small percentage of cases of polycythemia vera that do not carry the JAK2 V617F mutation have somatic, activating mutations in JAK2 exon 12 which typically affect the region encompassing codons 536-547 and are in-frame deletions/insertions, duplications of 8-12 amino acids or missense mutations. Mutations in JAK2 are typically mutually exclusive with mutations in the thrombopoietin receptor (MPL) and calreticulin (CALR), but JAK2 mutations may co-exist with mutations in other genes (ie, IDH1, SF3B1, TET2, ASXL1, etc). Ruxolitinib is a JAK2 inhibitor that has been approved for use in patients with intermediate- and high-risk primary myelofibrosis and is under study in other JAK2+ MPNs. Other JAK2 inhibitors (eg, Pacritinib) are also in various stages of study.

Last updated: 2018-11-12 20:41:32 UTC
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Tier 1
JAK2
Variants
JAK2 codon(s) 683 missense
JAK2 any mutation
Primary Sites
Bone Marrow
Blood
Tumor Types
B Lymphoblastic Leukemia/Lymphoma
Interpretation

Mutations at codon R683 of JAK2, have been previously described in B-ALL (especially Down Syndrome associated B-ALL) and represent a mutational "hotspot"; Some variants at this codon (R683) are known to be activating mutations. Cases of B-ALL with JAK2 mutations tend to also show rearrangement/overexpression of CRLF2; these are potentially targetable pathway alterations. Such cases tend to have a BCR/ABL-like transcriptional signature.

Last updated: 2018-11-12 20:41:32 UTC
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Tier 2
JAK2
Variants
JAK2 copy number gain
JAK2 copy number loss
Primary Sites
Adrenal Gland
Anus
Ampulla (Pancreaticobiliary Duct)
Appendix
Bladder
Blood
Bone
Bone Marrow
Brain
Breast
Spinal Cord
Cervix
Chest Wall
Colon
Endometrium
Esophagus
Eye
Fallopian Tube
Fibroadipose Tissue
Gall Bladder
Kidney
Larynx
Liver
Lung
Lymph Node
Nasal Cavity
Oral Cavity
Ovary
Pancreas
Parathyroid
Penis
Peripheral Nervous System
Peritoneum
Pharynx
Pituitary
Placenta
Pleura
Prostate
Retroperitoneum
Salivary Gland
Seminal Vesicle
Skeletal Muscle
Skin
Small Intestine
Soft Tissue
Spleen
Stomach
Testis
Thymus
Thyroid
Tonsil
Unknown
Ureter
Uterus
Vagina
Rectum
Cartilage
Blood Vessel
Buccal Swab
Heart
Trachea
Salivary Duct
Spermatic Cord
Vulva
Brain, Infratentorial
Brain, Supratentorial
Gastroesophageal Junction
Sellar
Suprasellar
Peritoneal fluid
Pleural Fluid
Tongue
Tumor Types
Acinar Cell Carcinoma
Acinic Cell Carcinoma
Adenocarcinoma
Adenoid Cystic Carcinoma
Adenosarcoma
Ameloblastic Tumor
Anaplastic Large Cell Lymphoma
Angioimmunoblastic T-Cell Lymphoma
Angiomatoid Fibrous Histiocytoma
Angiomatosis
Angiomyolipoma
Angiosarcoma
Astrocytoma, Anaplastic
Basal Cell Carcinoma
Burkitt Lymphoma
Carcinoid Tumor
Carcinoma
Carcinosarcoma
Cholangiocarcinoma
Chondrosarcoma
Chordoma
Choriocarcinoma
Chromophobe Renal Cell Carcinoma
Chronic Lymphocytic Leukemia
Classical Hodgkin Lymphoma
Clear Cell Carcinoma
Clear Cell Renal Cell Carcinoma
Craniopharyngioma
Dermatofibrosarcoma
Desmoplastic Small Round Cell Tumor
Diffuse Large B Cell Lymphoma
Ductal Carcinoma
Ependymoma
Ewing Sarcoma
Fibromatosis
Follicular Carcinoma
Follicular Lymphoma
Gastrointestinal Stromal Tumor
Germ Cell Tumor
Giant Cell Tumor
Glioblastoma
Glomus Tumor
Granular Cell Tumor
Hairy Cell Leukemia
Hemangioendothelioma
Hepatocellular Carcinoma
Invasive Ductal Carcinoma
Kaposi Sarcoma
Leiomyoma
Leiomyosarcoma
Lipoma
Liposarcoma
Lobular Carcinoma
Lymphoplasmacytic Lymphoma
Malignant Mullerian Mixed Tumor
Mantle Cell Lymphoma
Marginal Zone B Cell Lymphoma
Medullary Carcinoma
Medulloblastoma
Melanoma
Meningioma
Merkel Cell Carcinoma
Mesothelioma
Mucinous Adenocarcinoma
Mucinous Tumors of Ovary
Mucoepidermoid Carcinoma
Myxofibrosarcoma
Nasopharyngeal Carcinoma
Neuroblastoma
Neuroendocrine Carcinoma
Neuroendocrine Neoplasm
NK Cell Lymphoproliferative Disorder
NLPHL
Non-Small Cell Lung Carcinoma
Oligodendroglioma
Osteosarcoma
Papillary Carcinoma
Papillary Renal Cell Carcinoma
Peripheral T Cell Lymphoma
Pheochromocytoma
Plasma Cell Disorder
Post-Transplant Lymphoproliferative Disorder
Primitive Neuroectodermal Tumor
Renal Cell Carcinoma
Reninoma
Retinoblastoma
Rhabdomyosarcoma
Sarcoma
Schwannoma
Serous Carcinoma
Sex Cord Stromal Tumor
Small Cell Carcinoma
Solid Pseudopapillary Tumor of Pancreas
Spindle Cell Neoplasm
Squamous Cell Carcinoma
T Cell Lymphoproliferative Disorder
T-Cell LGL Leukemia
Thymic Carcinoma
Thymoma
Urothelial Carcinoma
Tumors of Peripheral Nerves
Unknown
Wilms Tumor
Ependymoma, Anaplastic
Astrocytoma, Pilocytic
Ganglioglioma
Neuroepithelial Neoplasm, NOS
Pleomorphic Carcinoma
Solitary Fibrous Tumor
Neuroepithelial neoplasm, high grade
Astrocytoma, NOS
Astrocytoma, Diffusely Infiltrating
Diffuse Midline Glioma
Infiltrating Glioma, NOS
Intraductal Papillary Mucinous Neoplasm (IPMN)
Lymphadenopathy
Lymphocytosis, Symptomatic
Monoclonal Gammopathy
Mucinous or Serous Cystic Neoplasms of Pancreas
Mycosis Fungoides, Unspecified Site
Oligodendroglioma, Anaplastic
Pleomorphic Xanthoastrocytoma
Rash and Other Nonspecific Skin Eruption
Hurthle Cell Carcinoma
High Grade Glioma
Undifferentiated Sarcoma
Glioma
Interpretation

This gene is a known cancer gene.

Last updated: 2019-08-28 14:53:57 UTC
Read More
Tier 2
JAK2
Variants
JAK2 any mutation
Primary Sites
Adrenal Gland
Anus
Ampulla (Pancreaticobiliary Duct)
Appendix
Bladder
Blood
Bone
Bone Marrow
Brain
Breast
Spinal Cord
Cervix
Chest Wall
Colon
Endometrium
Esophagus
Eye
Fallopian Tube
Fibroadipose Tissue
Gall Bladder
Kidney
Larynx
Liver
Lung
Lymph Node
Nasal Cavity
Oral Cavity
Ovary
Pancreas
Parathyroid
Penis
Peripheral Nervous System
Peritoneum
Pharynx
Pituitary
Placenta
Pleura
Prostate
Retroperitoneum
Salivary Gland
Seminal Vesicle
Skeletal Muscle
Skin
Small Intestine
Soft Tissue
Spleen
Stomach
Testis
Thymus
Thyroid
Tonsil
Unknown
Ureter
Uterus
Vagina
Rectum
Cartilage
Blood Vessel
Buccal Swab
Heart
Trachea
Salivary Duct
Spermatic Cord
Vulva
Brain, Infratentorial
Brain, Supratentorial
Gastroesophageal Junction
Sellar
Suprasellar
Peritoneal fluid
Pleural Fluid
Tongue
Tumor Types
Acinar Cell Carcinoma
Acinic Cell Carcinoma
Adenocarcinoma
Adenoid Cystic Carcinoma
Adenosarcoma
Ameloblastic Tumor
Anaplastic Large Cell Lymphoma
Angioimmunoblastic T-Cell Lymphoma
Angiomatoid Fibrous Histiocytoma
Angiomatosis
Angiomyolipoma
Angiosarcoma
Astrocytoma, Anaplastic
Basal Cell Carcinoma
Burkitt Lymphoma
Carcinoid Tumor
Carcinoma
Carcinosarcoma
Cholangiocarcinoma
Chondrosarcoma
Chordoma
Choriocarcinoma
Chromophobe Renal Cell Carcinoma
Chronic Lymphocytic Leukemia
Classical Hodgkin Lymphoma
Clear Cell Carcinoma
Clear Cell Renal Cell Carcinoma
Craniopharyngioma
Dermatofibrosarcoma
Desmoplastic Small Round Cell Tumor
Diffuse Large B Cell Lymphoma
Ductal Carcinoma
Ependymoma
Ewing Sarcoma
Fibromatosis
Follicular Carcinoma
Follicular Lymphoma
Gastrointestinal Stromal Tumor
Germ Cell Tumor
Giant Cell Tumor
Glioblastoma
Glomus Tumor
Granular Cell Tumor
Hairy Cell Leukemia
Hemangioendothelioma
Hepatocellular Carcinoma
Invasive Ductal Carcinoma
Kaposi Sarcoma
Leiomyoma
Leiomyosarcoma
Lipoma
Liposarcoma
Lobular Carcinoma
Lymphoplasmacytic Lymphoma
Malignant Mullerian Mixed Tumor
Mantle Cell Lymphoma
Marginal Zone B Cell Lymphoma
Medullary Carcinoma
Medulloblastoma
Melanoma
Meningioma
Merkel Cell Carcinoma
Mesothelioma
Mucinous Adenocarcinoma
Mucinous Tumors of Ovary
Mucoepidermoid Carcinoma
Myxofibrosarcoma
Nasopharyngeal Carcinoma
Neuroblastoma
Neuroendocrine Carcinoma
Neuroendocrine Neoplasm
NK Cell Lymphoproliferative Disorder
NLPHL
Non-Small Cell Lung Carcinoma
Oligodendroglioma
Osteosarcoma
Papillary Carcinoma
Papillary Renal Cell Carcinoma
Peripheral T Cell Lymphoma
Pheochromocytoma
Plasma Cell Disorder
Post-Transplant Lymphoproliferative Disorder
Primitive Neuroectodermal Tumor
Renal Cell Carcinoma
Reninoma
Retinoblastoma
Rhabdomyosarcoma
Sarcoma
Schwannoma
Serous Carcinoma
Sex Cord Stromal Tumor
Small Cell Carcinoma
Solid Pseudopapillary Tumor of Pancreas
Spindle Cell Neoplasm
Squamous Cell Carcinoma
T Cell Lymphoproliferative Disorder
T-Cell LGL Leukemia
Thymic Carcinoma
Thymoma
Urothelial Carcinoma
Tumors of Peripheral Nerves
Unknown
Wilms Tumor
Ependymoma, Anaplastic
Astrocytoma, Pilocytic
Ganglioglioma
Neuroepithelial Neoplasm, NOS
Pleomorphic Carcinoma
Solitary Fibrous Tumor
Neuroepithelial neoplasm, high grade
Astrocytoma, NOS
Astrocytoma, Diffusely Infiltrating
Diffuse Midline Glioma
Infiltrating Glioma, NOS
Intraductal Papillary Mucinous Neoplasm (IPMN)
Lymphadenopathy
Lymphocytosis, Symptomatic
Monoclonal Gammopathy
Mucinous or Serous Cystic Neoplasms of Pancreas
Mycosis Fungoides, Unspecified Site
Oligodendroglioma, Anaplastic
Pleomorphic Xanthoastrocytoma
Rash and Other Nonspecific Skin Eruption
Hurthle Cell Carcinoma
High Grade Glioma
Undifferentiated Sarcoma
Glioma
Interpretation

This gene is a known cancer gene.

Last updated: 2019-08-28 14:53:59 UTC
Read More
Tier 3
JAK2
Variants
JAK2 codon(s) 683 missense
Primary Sites
Thyroid
Tumor Types
Papillary Carcinoma
Interpretation

JAK2 is a non-receptor tyrosine kinase that mediates signaling via the JAK-STAT pathway and the somatic, activating mutation V617F in the pseudokinase domain of JAK2 has been reported in over 90% of patients with polycythemia vera, 40-70% of essential thrombocytemia and 40-60% of primary myelofibrosis. JAK2 mutations have not been described in papillary thyroid carcinomas. Moreover, this variant has high prevalence in the East Asian population, and thus is predicted be a germline variant. Clinical correlation with other laboratory findings is recommended.

Last updated: 2019-01-22 19:23:59 UTC
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Disclaimer: You assume full responsibility for all risks associated with using this PMKB website. The Englander Institute for Precision Medicine at Weill Cornell Medicine makes no guarantee of the comprehensiveness, reliability or accuracy of the information on this website and assumes no responsibility for errors in the information associated with this web site. Healthcare providers and patients must integrate all clinical and laboratory findings as well as information from a variety of sources before deciding on appropriate clinical care options.


When using PMKB, please cite: Huang et al., JAMIA 2017


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