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ORPHA:300878

Hairy cell leukemia variant

low confidenceDisorder

Also known as: HCL-v · Leukemic reticuloendotheliosis variant · Prolymphocytic variant of HCL · Prolymphocytic variant of hairy cell leukemia

Publications

1,323

Trials

4

Interventional, condition-specific

Researchers

1,158

Distinct authors in sample

Gene link

—

Readiness

2/6

Stages with a signal

Clinical definition (Orphanet)

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 , elevated white blood cell (WBC) count, hyper-cellular bone marrow and anemia/thrombocytopenia, but no monocytopenia.

How rare: How common this is has not been clearly measured.

Orphanet entry

Cross-references

Joined from Mondo / Orphanet. MeSH labels may enter searches; UMLS / OMIM / NCIT are stored for reference.

Additional Mondo synonyms (6)

HCL-V · hairy cell leukemia variant · leukemic reticuloendotheliosis variant · prolymphocytic variant of HCL · prolymphocytic variant of hairy cell leukaemia · prolymphocytic variant of hairy cell leukemia

Research stages

Trial readiness signals

Where this condition sits on an open-data research pipeline — not how close a treatment is, and not medical advice. Empty stages often mean “not in these databases under this Mondo ID,” not “impossible.”

2/6 stages with a signal

An interventional trial matched this condition name on ClinicalTrials.gov — see trials below.

  1. Gene identifiedNot found

    No GenCC disease–gene assertion in this build

  2. LiteraturePresent

    1,323 matched papers (937 in last 10 years) Source

  3. Phenotype characterisedNot found

    No HPO disease–phenotype associations via Monarch for these Mondo IDs

  4. Animal modelNot found

    No Alliance genotype “model of” associations via Monarch for these Mondo IDs

  5. Orphan designationNot found

    No FDA or EMA orphan-drug designation matched this disease via UMLS or preferred name Source

  6. Interventional trialPresent

    4 matched on ClinicalTrials.gov (3 recruiting in sample)

Biology

Genes and phenotypes

Gene–disease validity from GenCC, plus phenotypes and animal models joined from Monarch Initiative via Mondo ID — not a clinical diagnosis aid.

Do we know what causes it?

Not yet — the cause hasn't been pinned down in GenCC.

No strong gene–disease assertion joined for this Orphanet entity.

Phenotypes (Monarch / HPO)

None returned for this Mondo ID. That often means “not linked under this ID,” not “no clinical features.”

Animal models (Monarch / Alliance)

None returned for this Mondo ID. Empty here is not proof that no model organism work exists under another name or gene.

Monarch fetch 2026-07-29

Therapies

Designations, candidates, and chemicals

FDA OOPD and EMA orphan designations, Open Targets clinical candidates, and CTD chemical associations via MyDisease.info. These never change the interventional-trial headline.

Orphan designation (FDA · EMA)

No designation matched this disease via UMLS or preferred name on the FDA OOPD mirror or EMA orphan register. Absence here is not proof that none exists under another wording.

Open Targets candidates

No drugs or clinical candidates returned for this Mondo ID on Open Targets.

CTD chemicals (MyDisease.info)

No CTD chemical associations returned for this Mondo ID.

Literature

Is anyone studying this?

1,323

1,323 papers have been published on this condition. That is a real research literature — still far smaller than common diseases (breast cancer: over 700,000 papers). Median papers in the last 10 years for a rare disease in this dataset (publications denominator n=3967) is 59.

1,323 papers since the earliest indexed year in this search — median last-10-year count for a rare disease in this dataset is 59 (publications denominator n=3967).

937 in the last 10 years · low confidence

Phrase hits: 1,323 · MeSH hits: 0

Open Europe PMC search

Who's working on it?

1,158

Distinct author names in 200 sampled papers — named people below.

Who's working on it?

People publishing on this condition (sampled Europe PMC records). Affiliation is the most recent found in that sample.

  1. 01
    Troussard X18 papers · 2026

    Department of Hematology, Centre Hospitalier Universitaire Côte de Nacre, Caen, France.

    Papers in Europe PMC
  2. 02
    Kreitman RJ12 papers · 2026

    Laboratory of Molecular Biology, National Cancer Institute, National Institutes of Health, Bethesda, MD.

    Papers in Europe PMC
  3. 03
    Maitre E10 papers · 2026

    Hématologie, CHU de Caen-Normandie, avenue Côte Nacre, 14033 Caen cedex, France.

    Papers in Europe PMC
  4. 04
    Robak T10 papers · 2026

    Department of Hematology, Medical University of Lodz, Lodz, Poland.

    Papers in Europe PMC
  5. 05
    Paillassa J7 papers · 2025

    Service des maladies du sang, centre hospitalier universitaire d'Angers, Pays de la Loire, 49933 Angers cedex, France.

    Papers in Europe PMC
  6. 06
    Ravandi F7 papers · 2026

    Section of Developmental Therapeutics, Department of Leukemia, University of Texas MD Anderson Cancer Center, Houston, TX.

    Papers in Europe PMC
  7. 07
    Arons E6 papers · 2026

    National Cancer Institute's Center for Cancer Research, National Institutes of Health, Bethesda, Maryland.

    Papers in Europe PMC
  8. 08
    Matutes E6 papers · 2024

    Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), Spain.

    Papers in Europe PMC
  9. 09
    Medeiros LJ6 papers · 2025

    Department of Hematopathology, The University of Texas M.D. Anderson Cancer Center, Houston, Texas.

    Papers in Europe PMC
  10. 10
    Campo E5 papers · 2024

    Institut d'Investigacions Biomèdiques August Pi i Sunyer, Hospital Clínic, Universitat de Barcelona, Spain.

    Papers in Europe PMC

Clinical research

Is a treatment being tested?

4

interventional trials for this specific condition

4 interventional trials matched this specific condition name; 3 currently recruiting in our sample. 88 trials are registered for hairy cell leukemia, the broader category — shown separately because they may or may not enrol this specific subtype.

Data as of 11 September 2026

4 interventional trials — more than 77.2% of diseases in the trials denominator have none at all (5501 of 7126; this disease is at the 88.1th percentile).

low confidence · 88.1th percentile (trials denominator)

Recruiting interventional trials

From the matched ClinicalTrials.gov set

4 interventional trials matched after quoted-phrase search and title/condition post-filter.

Broader category: hairy cell leukemia

88

Interventional trials for the parent category, exclusive of NCT IDs already counted above. Eligibility for this subtype is not guaranteed.

Worth raising with a clinician. How we count trials.

Recruiting under the broader category

Other registries (secondary)

Broader net from EU CTIS, ISRCTN, and ICTRP when available — deduped against ClinicalTrials.gov IDs already counted above. Dual-model LLM relevance gates what we keep. These rows are not added to the interventional headline.

raw 0 · after dedupe 0 · already on CT.gov 0 · kept 0 · parent 0 · uncertain 0 · dropped 0 · fetched 2026-07-30

Source notes: ictrp: Error: ICTRP public search unavailable (WHO portal is SPA-only; SOAP needs partnership). Tried: https://apps.who.int/tri

No secondary-registry studies passed dual-model relevance for this condition name (after dedupe).

Where to find support

Condition-specific patient organisations, when Orphanet lists them, are on the disease’s Orphanet page. We also link umbrella groups that support undiagnosed and ultra-rare families.

Orphanet entry for Hairy cell leukemia variant — check Associations / patient organisations on that page.

India — NPRD

Last verified 2026-07-26

This ORPHAcode is not on our curated NPRD list (direct or Mondo-parent match). That does not decide clinical eligibility; families in India should ask a notified Centre of Excellence about current coverage.

Hand-curated for this project. ORPHAcode mappings are best-effort and may be incomplete or imprecise for umbrella categories. Parent (Mondo) matches mean the policy lists a broader category — confirm eligibility with a Centre of Excellence. Financial entitlements summarised from public policy statements and may change. This is not official government guidance.

How we counted this

Europe PMC query (preferred label + any corrected label + Orphanet and Mondo exact synonyms, stoplisted; unioned with resolved MeSH labels when available). UMLS / OMIM / NCIT cross-references are stored on the overview but are not added to the query string.

"Hairy cell leukemia variant" OR "HCL-v" OR "Leukemic reticuloendotheliosis variant" OR "Prolymphocytic variant of HCL" OR "Prolymphocytic variant of the HCL" OR "Prolymphocytic variant of hairy cell leukemia" OR "Prolymphocytic variant of the hairy cell leukemia" OR "prolymphocytic variant of hairy cell leukaemia" OR "prolymphocytic variant of the hairy cell leukaemia"

Run this search on Europe PMC

ClinicalTrials.gov query (quoted phrases + MeSH via query.cond, plus recall-expansion terms when used):

"Hairy cell leukemia variant" OR "HCL-v" OR "Leukemic reticuloendotheliosis variant" OR "Prolymphocytic variant of HCL" OR "Prolymphocytic variant of the HCL" OR "Prolymphocytic variant of hairy cell leukemia" OR "Prolymphocytic variant of the hairy cell leukemia" OR "prolymphocytic variant of hairy cell leukaemia" OR "prolymphocytic variant of the hairy cell leukaemia"

Interventional trials matched via: phrase (mesh = registered under a MeSH descriptor no name phrase would catch; recall-expansion = gene / selected parent terms used only for trials).

Study-type breakdown: 4 interventional · 0 observational · 0 expanded access. Only interventional studies enter the trial headline.

Parent-category trials query:

"hairy cell leukemia"

Query health: ok — strategies attempted: phrase; with hits: phrase

Run this search on ClinicalTrials.gov

Confidence reasoning

  • Preferred label is multi-word and distinctive
  • No synonyms dropped by stoplist
  • No label/synonym collisions with other diseases in this corpus
  • Publication count (1323) is extremely high with unknown/missing prevalence — treat as possible over-matching, not proven research intensity

Ingested 2026-07-27T12:45:10.398Z