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10 slides generated from the cancer page, with a quiz from the open benchmark and speaker notes that cite the sources. Arrow keys move between slides; Print gives one slide per page.
Hairy cell leukaemia is a rare, slow B-cell leukaemia with a single defining mutation (BRAF V600E) that is unusually curable: one week of a purine analogue puts most people into remission for years, and BRAF drugs rescue those who relapse.
Classic hairy cell leukaemia (HCL) is a mature B-cell neoplasm with a distinctive morphology and immunophenotype (CD11c, CD25, CD103, CD123, annexin A1) and BRAF V600E in essentially all cases (Tiacci 2011); the variant HCL-v lacks BRAF V600E, is CD25-negative, and behaves worse (often MAP2K1-mutant). Patients present with pancytopenia, splenomegaly and infections.
Purine analogues (cladribine or pentostatin) give complete remission in 80-90% with a single course, and adding rituximab (concurrent or delayed) deepens responses and achieves MRD negativity in most (Chihara et al.). Relapse is treated with a second purine analogue course plus rituximab; BRAF inhibition (vemurafenib ± rituximab) gives durable remissions in multiply relapsed disease (Tiacci 2021, NEJM), and BRAF+MEK combinations are an option. Moxetumomab pasudotox (anti-CD22 immunotoxin) was approved in 2018 and withdrawn commercially in 2023. Ibrutinib has modest activity. Overall survival is now close to age-matched controls.
| Setting | Approach | Guideline |
|---|---|---|
| First line, symptomatic | Cladribine (5-7 days) or pentostatin, with rituximab concurrent or delayed (improves MRD-negative CR). | NCCN Category 1 (cladribine ± rituximab) |
| Relapse after >2 years | Repeat purine analogue + rituximab. | NCCN Category 2A |
| Early relapse or refractory | Vemurafenib + rituximab (or dabrafenib-trametinib); ibrutinib; clinical trial. Moxetumomab pasudotox produced durable remissions but was withdrawn from sale in 2023 and is no longer available. | NCCN Category 2A |