raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:300878

Hairy cell leukemia variant

Synonyms: HCL-v · Leukemic reticuloendotheliosis variant · Prolymphocytic variant of HCL · Prolymphocytic variant of hairy cell leukemia

Type
Disease
Group
Disorder
Inheritance
Unknown
Age of onset
Adult, Elderly
Status
active

A rare, malignant splenic B-cell lymphoma/leukemia characterized by circulating abnormal lymphocytes with intermediate morphology between prolymphocytes and hairy cells with positive expression of CD11c and negative expression of CD25, CD123 and the BRAFV600E mutation. Manifestations include splenomegaly, elevated white blood cell (WBC) count, hyper-cellular bone marrow and anemia/thrombocytopenia, but no monocytopenia.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enHairy cell leukemia variantHCL-v · Leukemic reticuloendotheliosis variant · Prolymphocytic variant of HCL · Prolymphocytic variant of hairy cell leukemia
frLeucémie à tricholeucocytes varianteHCL variant prolymphocytique · HCL-v · Leucémie à tricholeucocytes, variant prolymphocytique
deHaarzell-Leukämie-VarianteHCL-v · Haarzellenleukämie, prolymphozytäre Variante · Prolymphozytäre Variante der HCL · Retikuloendotheliose, leukämische, Variante
esLeucemia de células peludas varianteHCL-v · Variante de la reticuloendoteliosis leucémica · Variante prolinfocítica de la HCL · Variante prolinfocítica de la leucemia de células pilosas
itVariante della leucemia a cellule capelluteHCL-v · Variante della reticoloendoteliosi leucemica · Variante prolinfocitica della HCL · Variante prolinfocitica della leucemia a cellule capellute
nlVariant van haarcelleukemieProlymfocytische variant van HCL · Prolymfocytische variant van haarcelleukemie · Variant van 'hairy cell'-leukemie · Variant van leukemische reticulo-endotheliose · HCL-v
ptLeucemia de células pilosas, variante
plWariant białaczki włochatokomórkowejHCL-v · Leukemic reticuloendotheliosis variant · Prolimfocytarny wariant białaczki włochatokomórkowej · Prolimfocytarny wariant HCL
csLeukémie z vláskových buněkHCL-v · Leukemická retikuloendotelióza · Prolymfocytární varianta HCL · Prolymfocytární leukémie z vláskových buněk
ukВолосатоклітинний варіант лейкозуHCL-v · Варіант лейкемічного ретикулоендотеліозу · Пролімфоцитарний варіант волосатоклітинної лейкемії · Пролімфоцитарний варіант ВКЛ
zh变异型毛细胞白血病网状内皮病变异型白血病
trTüylü hücreli lösemi varyantıHCL-v · HCL'nin prolenfositik varyantı · Lösemik retiküloendotelyoz varyantı · Tüylü hücreli löseminin prolenfositik varyantı

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10C91.4NTBTattributedvalidated
ICD-112A82.3NTBTindexvalidated
MONDO0017600Evalidated
UMLSC0349633Evalidated
MedDRA10019054Evalidated

E exact · NTBT this ORPHAcode is narrower than the target · BTNT broader than the target · ND not decided.

3

Classification

Preferential parent (Orphanet linearisation):

Parents in the classifications (1):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
IGHV4-34Major susceptibility factor inAssessedHGNC:5650ENSG0000021195614q32.33immunoglobulin heavy variable 4-3421599610[PMID]_19745070[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Annual incidence1-9 / 1 000 0000.22 / 100 000United StatesValue and classValidated[EXPERT]_ORPHANET
Point prevalenceUnknown—WorldwideClass onlyNot yet validatedORPHANET

Value is Orphadata's ValMoy: the mean estimate per 100 000 for prevalence and incidence, the number of cases or families for case reports.

6

HPO phenotypes

Orphanet has no HPO annotation for this code in this release.

7

Sources for this card