Lymphoproliferative Disorders

Lymphoproliferative disorders (LPDs) are a heterogeneous group of conditions where lymphocytes (B-cells, T-cells, or NK cells) proliferate excessively. They range from benign, reactive processes to aggressive lymphomas. They reflect a failure of immune regulation and can occur spontaneously, in the context of infection (e.g., EBV), autoimmune disease, or immunosuppression.

📊 Classification

• Reactive Lymphoproliferation – benign response to infection (e.g., EBV, CMV).
• Chronic Lymphocytic Leukaemia (CLL) – indolent, common in older adults.
• Non-Hodgkin’s Lymphoma (NHL) – wide spectrum from indolent (e.g., follicular) to aggressive (e.g., diffuse large B-cell lymphoma).
• Hodgkin’s Lymphoma – characterized by Reed–Sternberg cells, bimodal age distribution.
• Post-Transplant Lymphoproliferative Disorder (PTLD) – EBV-driven, immunosuppressed patients.

🧬 Aetiology

• Genetic mutations affecting lymphocyte proliferation and apoptosis.
• Viral infections: Epstein–Barr virus (EBV), HTLV-1, HIV.
• Chronic immune stimulation: autoimmune diseases, chronic infection.
• Immunosuppression: e.g., post-organ transplant, long-term steroids, or biologics.

🧑‍⚕️ Clinical Features

• General: Fatigue, fever, night sweats, weight loss ("B symptoms").
• Lymphadenopathy – painless, rubbery, firm lymph nodes.
• Hepatosplenomegaly – due to infiltration of liver/spleen.
• Bone marrow failure → anaemia, infections, bleeding (esp. in advanced disease).
• Specific presentations: - CLL – recurrent infections, autoimmune haemolysis. - Hodgkin’s – alcohol-induced lymph node pain, mediastinal mass. - NHL – rapidly enlarging lymph nodes, extranodal disease (gut, skin, CNS).

🔎 Investigations

• Bloods: FBC (lymphocytosis in CLL), ESR, LDH, uric acid.
• Peripheral smear: Smudge cells in CLL.
• Immunophenotyping: Flow cytometry to identify clonal B/T-cell markers.
• Biopsy: Excisional lymph node biopsy – gold standard for lymphoma diagnosis.
• Imaging: CT or PET-CT for staging and extranodal involvement.
• Bone marrow biopsy: For staging and marrow infiltration.

⚖️ Staging (Ann Arbor for Lymphoma)

• Stage I – 1 lymph node region.
• Stage II – ≥2 regions same side of diaphragm.
• Stage III – both sides of diaphragm.
• Stage IV – disseminated (e.g., marrow, liver).

💊 Management

• Supportive: Vaccinations, antibiotics for infections, growth factors.
• CLL: Watch-and-wait if asymptomatic. Chemotherapy (e.g., FCR: fludarabine, cyclophosphamide, rituximab) or novel agents (ibrutinib, venetoclax) if symptomatic/progressive.
• Hodgkin’s: ABVD chemotherapy ± radiotherapy. High cure rates, esp. in young patients.
• NHL: Depends on type – - Indolent: may watch-and-wait, or rituximab-based therapy. - Aggressive: R-CHOP chemotherapy (rituximab, cyclophosphamide, doxorubicin, vincristine, prednisolone).
• PTLD: Reduce immunosuppression, rituximab, chemotherapy if needed.
• Transplant/advanced: Autologous or allogeneic stem cell transplantation in selected cases.

📉 Prognosis

• CLL – indolent, survival years–decades, but some transform (Richter’s transformation).
• Hodgkin’s – one of the most curable adult cancers (80–90% remission).
• NHL – variable, indolent forms are chronic but incurable; aggressive forms may be curable.

📚 References

• StatPearls – Lymphoproliferative Disorders
• BNF – Chemotherapy agents

🧑‍⚕️ Case Examples - Lymphoproliferative Disorders

• Case 1 (Chronic Lymphocytic Leukaemia - CLL): 🧪 A 72-year-old man presents with fatigue and night sweats. FBC shows lymphocytosis (WCC 70 × 10⁹/L). Examination reveals generalised lymphadenopathy and splenomegaly. Flow cytometry confirms a clonal B-cell population. Diagnosis: Chronic Lymphocytic Leukaemia. Teaching point: CLL often follows an indolent course; many patients are managed with “watch and wait” until symptomatic.
• Case 2 (Hodgkin’s Lymphoma): 🎗️ A 28-year-old man reports painless cervical lymph node enlargement and drenching night sweats. Biopsy shows Reed–Sternberg cells. PET-CT confirms stage II disease. Diagnosis: Classical Hodgkin’s Lymphoma. Teaching point: Hodgkin’s lymphoma typically affects young adults and has a high cure rate with ABVD chemotherapy.
• Case 3 (Non-Hodgkin’s Lymphoma - aggressive subtype): ⚡ A 65-year-old woman develops rapidly enlarging abdominal lymph nodes and weight loss. Biopsy confirms diffuse large B-cell lymphoma (DLBCL). Diagnosis: Aggressive Non-Hodgkin’s Lymphoma. Teaching point: Aggressive NHLs present with rapidly progressive disease but are potentially curable with R-CHOP chemotherapy.
• Case 4 (Post-Transplant Lymphoproliferative Disorder - PTLD): 💉 A 58-year-old renal transplant recipient on tacrolimus develops fever, weight loss, and lymphadenopathy. EBV PCR is positive, and lymph node biopsy shows PTLD. Diagnosis: Post-Transplant Lymphoproliferative Disorder. Teaching point: PTLD is linked to immunosuppression and EBV infection; initial management involves reducing immunosuppression and rituximab-based therapy.