Subcutaneous panniculitis-like T-cell lymphoma

Haematolymphoid Tumours (WHO Classification, 5th ed.)

(General Instructions – The focus of these pages is the clinically significant genetic alterations in each disease type. This is based on up-to-date knowledge from multiple resources such as PubMed and the WHO classification books. The CCGA is meant to be a supplemental resource to the WHO classification books; the CCGA captures in a continually updated wiki-stye manner the current genetics/genomics knowledge of each disease, which evolves more rapidly than books can be revised and published. If the same disease is described in multiple WHO classification books, the genetics-related information for that disease will be consolidated into a single main page that has this template (other pages would only contain a link to this main page). Use HUGO-approved gene names and symbols (italicized when appropriate), HGVS-based nomenclature for variants, as well as generic names of drugs and testing platforms or assays if applicable. Please complete tables whenever possible and do not delete them (add N/A if not applicable in the table and delete the examples); to add (or move) a row or column in a table, click nearby within the table and select the > symbol that appears. Please do not delete or alter the section headings. The use of bullet points alongside short blocks of text rather than only large paragraphs is encouraged. Additional instructions below in italicized blue text should not be included in the final page content. Please also see Author_Instructions and FAQs as well as contact your Associate Editor or Technical Support.)

Primary Author(s)*

Ian King, PhD

WHO Classification of Disease

Structure	Disease
Book	Haematolymphoid Tumours (5th ed.)
Category	T-cell and NK-cell lymphoid proliferations and lymphomas
Family	Mature T-cell and NK-cell neoplasms
Type	Primary cutaneous T-cell lymphoid proliferations and lymphomas
Subtype(s)	Subcutaneous panniculitis-like T-cell lymphoma

Related Terminology

Acceptable	N/A
Not Recommended	N/A

Gene Rearrangements

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Driver Gene	Fusion(s) and Common Partner Genes	Molecular Pathogenesis	Typical Chromosomal Alteration(s)	Prevalence -Common >20%, Recurrent 5-20% or Rare <5% (Disease)	Diagnostic, Prognostic, and Therapeutic Significance - D, P, T	Established Clinical Significance Per Guidelines - Yes or No (Source)	Clinical Relevance Details/Other Notes

Individual Region Genomic Gain/Loss/LOH

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Chr #	Gain, Loss, Amp, LOH	Minimal Region Cytoband and/or Genomic Coordinates [Genome Build; Size]	Relevant Gene(s)	Diagnostic, Prognostic, and Therapeutic Significance - D, P, T	Established Clinical Significance Per Guidelines - Yes or No (Source)	Clinical Relevance Details/Other Notes

Characteristic Chromosomal or Other Global Mutational Patterns

Put your text here and fill in the table (Instructions: Included in this category are alterations such as hyperdiploid; gain of odd number chromosomes including typically chromosome 1, 3, 5, 7, 11, and 17; co-deletion of 1p and 19q; complex karyotypes without characteristic genetic findings; chromothripsis; microsatellite instability; homologous recombination deficiency; mutational signature pattern; etc. Details on clinical significance such as prognosis and other important information can be provided in the notes section. Please include references throughout the table. Do not delete the table.)

Chromosomal Pattern	Molecular Pathogenesis	Prevalence - Common >20%, Recurrent 5-20% or Rare <5% (Disease)	Diagnostic, Prognostic, and Therapeutic Significance - D, P, T	Established Clinical Significance Per Guidelines - Yes or No (Source)	Clinical Relevance Details/Other Notes

Gene Mutations (SNV/INDEL)

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Gene	Genetic Alteration	Tumor Suppressor Gene, Oncogene, Other	Prevalence - Common >20%, Recurrent 5-20% or Rare <5% (Disease)	Diagnostic, Prognostic, and Therapeutic Significance - D, P, T	Established Clinical Significance Per Guidelines - Yes or No (Source)	Clinical Relevance Details/Other Notes
HAVCR2	Specific missense loss of function	Tumor suppressor	Common >20%,	May have prognostic and therapeutic significance in patients presenting with hemophagocytic syndromes.	No	Homozygous p.Y82C pathogenic variant is more common in East Asian populations, with p.T101I being a variant in South Asian (Thai) populations, and p.I97M being more common in European and North African populations.

Note: A more extensive list of mutations can be found in cBioportal, COSMIC, and/or other databases. When applicable, gene-specific pages within the CCGA site directly link to pertinent external content.

Epigenomic Alterations

None currently identified.

Genes and Main Pathways Involved

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Gene; Genetic Alteration	Pathway	Pathophysiologic Outcome
ARID1B, SMARCA4, NCOR1, KMT2C, KMT2D, DOTIL, CHD3, CHD4, PBRM1, CREBBP, ASXL1, MBD1, KMT2B, HIST1H3J	Epigenetic modifiers	Unregulated cell division
TSC1, MTOR, PIK3CB, PIK3CA, PIK3CD, TSC2, AKT2	PI3K/AKT/mTOR pathway	Increased cell growth and proliferation
IL7R, JAK3, STAT3	JAK3/STAT pathway	Unregulated cell division
TP53 and NAV3; loss of tumor suppression	TP53	Increased cell growth and proliferation

Genetic Diagnostic Testing Methods

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Familial Forms

Familial disease in East Asian population: recessive. Hereditary form is Associated with severe HLH?. Put your text here (Instructions: Include associated hereditary conditions/syndromes that cause this entity or are caused by this entity.)

Additional Information

Suggestions that this entity is triggered by viral etiologies (EBV/COVID-19). Put your text here

Links

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References

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Notes

*Primary authors will typically be those that initially create and complete the content of a page.  If a subsequent user modifies the content and feels the effort put forth is of high enough significance to warrant listing in the authorship section, please contact the Associate Editor or other CCGA representative.  When pages have a major update, the new author will be acknowledged at the beginning of the page, and those who contributed previously will be acknowledged below as a prior author.

Prior Author(s):

*Citation of this Page: “Subcutaneous panniculitis-like T-cell lymphoma”. Compendium of Cancer Genome Aberrations (CCGA), Cancer Genomics Consortium (CGC), updated 12/15/2025, https://ccga.io/index.php/HAEM5:Subcutaneous_panniculitis-like_T-cell_lymphoma.