📋 Key Information Summary
- Lymphoma comprises Hodgkin lymphoma (HL; ~10% of cases in Australia) and non-Hodgkin lymphoma (NHL; ~90%), each with distinct biology, prognosis, and treatment paradigms.
- HL is characterised by Reed–Sternberg cells (CD15⁺/CD30⁺) and typically presents in young adults with contiguous nodal spread; cure rates exceed 80% with modern therapy.
- Diffuse large B-cell lymphoma (DLBCL) is the most common aggressive NHL subtype; rituximab plus CHOP (R-CHOP) is the standard first-line regimen, achieving 60–70% durable remission.
- Follicular lymphoma is the most common indolent NHL; watchful waiting remains appropriate for asymptomatic low-tumour-burden disease.
- Ann Arbor staging (modified Lugano classification) is used for both HL and NHL, with PET-CT now the standard imaging modality replacing prior CT-based staging.
- Fluorodeoxyglucose (FDG) PET-CT is essential for staging, interim response assessment (Deauville score), and end-of-treatment evaluation in FDG-avid lymphomas.
- ABVD (doxorubicin, bleomycin, vinblastine, dacarbazine) is the standard first-line regimen for classical Hodgkin lymphoma in Australia.
- R-CHOP-21 (rituximab, cyclophosphamide, doxorubicin, vincristine, prednisolone every 21 days) is first-line for DLBCL and most aggressive B-cell NHL.
- Involved-site radiotherapy (ISRT) consolidates bulky disease or residual masses after chemotherapy; modern techniques minimise toxicity.
- Brentuximab vedotin (anti-CD30) and checkpoint inhibitors (nivolumab, pembrolizumab) are available in Australia for relapsed/refractory HL under PBS Authority criteria.
- Autologous and allogeneic haematopoietic stem cell transplantation remain important for relapsed/refractory disease at specialised Australian centres.
- Aboriginal and Torres Strait Islander peoples have lower survival rates for lymphoma due to delayed presentation, reduced access to specialist services, and higher comorbidity burden.
Introduction & Australian Epidemiology
Lymphoma is a heterogeneous group of malignancies arising from lymphocytes, classified broadly into Hodgkin lymphoma (HL) and non-Hodgkin lymphoma (NHL). Together they represent the sixth most common cancer in Australia, with approximately 7,000 new diagnoses annually. Treatment is guided by histological subtype, stage, and patient fitness, with CHOP-based chemotherapy regimens and anti-CD20 monoclonal antibody therapy (rituximab) forming the mainstay of management for the majority of aggressive B-cell lymphomas.
In Australia, NHL accounts for approximately 5,600 cases per year (age-standardised rate ~21 per 100,000), with incidence increasing steadily over recent decades, particularly in older adults. Diffuse large B-cell lymphoma (DLBCL) is the most common subtype (~35–40% of NHL), followed by follicular lymphoma (~20–25%), marginal zone lymphoma, mantle cell lymphoma, and Burkitt lymphoma. T-cell and NK-cell lymphomas constitute approximately 10–15% of NHL cases.
Classical Hodgkin lymphoma (cHL) accounts for ~600–700 new cases annually in Australia, with a bimodal age distribution peaking in the 20–30 and >60 year age groups. Nodular sclerosis is the most common subtype (60–80%), followed by mixed cellularity. Lymphocyte-predominant HL (nodular lymphocyte-predominant Hodgkin lymphoma, NLPHL) is a distinct entity (~5% of HL) with different immunophenotype (CD20⁺, CD15⁻, CD30⁻) and management.
Five-year relative survival for all lymphomas in Australia is approximately 72%, with HL achieving >85% and aggressive NHL 60–70%. Survival has improved significantly with the introduction of rituximab, PET-adapted therapy, and novel targeted agents. Indigenous Australians experience worse outcomes, reflecting disparities in access to timely diagnosis and specialist oncology services.
Classification (HL vs NHL Subtypes)
The World Health Organization (WHO) Classification of Haematolymphoid Tumours (5th edition, 2022) is the standard for lymphoma classification in Australia. Accurate histopathological diagnosis by a specialist haematopathologist is essential before initiating therapy. Immunohistochemistry, flow cytometry, and molecular/cytogenetic studies are integral to classification.
Classical Hodgkin Lymphoma (cHL)
cHL is defined by the presence of Reed–Sternberg cells (large binucleated cells) within an inflammatory microenvironment. Reed–Sternberg cells are typically CD15⁺, CD30⁺, CD20⁻/weak, CD45⁻, and PAX5⁺ (weak).
| Subtype | Frequency | Key Features |
|---|---|---|
| Nodular sclerosis (NSHL) | 60–80% | Most common; young adults; mediastinal involvement; collagen bands; lacunar cells |
| Mixed cellularity (MCHL) | 15–30% | Older adults; EBV-associated; diffuse inflammatory background |
| Lymphocyte-rich (LRHL) | ~5% | Rare; favourable prognosis; nodular pattern |
| Lymphocyte-depleted (LDHL) | <1% | Very rare; advanced stage; HIV-associated; poor prognosis |
Non-Hodgkin Lymphoma — Major Subtypes
NHL encompasses a broad spectrum of B-cell (~85–90%), T-cell, and NK-cell lymphomas. Aggressive subtypes require urgent treatment; indolent subtypes may be observed.
| Subtype | Behaviour | Immunophenotype / Genetics | First-Line Therapy |
|---|---|---|---|
| Diffuse large B-cell lymphoma (DLBCL), NOS | Aggressive | CD20⁺, CD19⁺; GCB vs ABC subtypes (Hans algorithm); MYC/BCL2/BCL6 rearrangements (double/triple hit) | R-CHOP-21 × 6 cycles ± ISRT |
| Follicular lymphoma (FL) | Indolent | CD20⁺, CD10⁺, BCL2⁺, BCL6⁺; t(14;18); grading 1–3B | Watch & wait (low burden); R-CHOP or R-CVP or BR (high burden) |
| Mantle cell lymphoma (MCL) | Aggressive (usually) | CD20⁺, CD5⁺, cyclin D1⁺; t(11;14); SOX11⁺ | R-CHOP or R-HyperCVAD; R-CHOP/R-DHAP alternating; ASCT consolidation in eligible patients |
| Burkitt lymphoma | Highly aggressive | CD20⁺, CD10⁺, BCL6⁺, BCL2⁻, MYC rearrangement; Ki-67 ~100% | DA-EPOCH-R or intensive protocols (HyperCVAD/MA) |
| Marginal zone lymphoma (MZL) | Indolent | CD20⁺, CD5⁻, CD10⁻, CD23⁻; MALT — t(11;18) in gastric | Localised: RT or H. pylori eradication (gastric); Disseminated: R-bendamustine |
| Peripheral T-cell lymphoma (PTCL), NOS | Aggressive | CD3⁺, CD4⁺ or CD8⁺; heterogeneous genetics | CHOEP or CHOP; consider ASCT consolidation |
| Anaplastic large cell lymphoma (ALCL) | Aggressive | CD30⁺, ALK⁺ (favourable) or ALK⁻ (unfavourable) | CHOP or CHOEP; brentuximab vedotin + CHP (ALK⁻) |
Ann Arbor Staging (Modified Lugano Classification)
The Ann Arbor staging system, as updated by the Lugano Classification (2014), remains the standard for staging both HL and NHL. PET-CT has replaced bone marrow biopsy as the primary modality for detecting marrow involvement in FDG-avid lymphomas (HL, DLBCL, FL). The Cotswolds modifications define bulk disease and extranodal involvement.
Additional Designations
- A — absence of B symptoms
- B — presence of B symptoms: unexplained fever >38°C, drenching night sweats, or >10% unintentional weight loss over 6 months
- E — extralymphatic extension from adjacent nodal disease
- S — splenic involvement
- X — bulky disease: mediastinal mass >⅓ thoracic diameter, or nodal mass >10 cm
Prognostic Scores
| Score | Applies To | Variables | Risk Stratification |
|---|---|---|---|
| International Prognostic Score (IPS) | Advanced-stage cHL | 7 factors: albumin <40 g/L, Hb <105 g/L, male sex, stage IV, age ≥45, WCC ≥15 × 10⁹/L, lymphocytes <0.6 × 10⁹/L or <8% of WCC | 0–1 favourable (5-yr FFS ~85%); ≥4 unfavourable (~55%) |
| IPI (International Prognostic Index) | Aggressive NHL (esp. DLBCL) | 5 factors: age >60, stage III–IV, ECOG ≥2, LDH >ULN, >1 extranodal site | Low (0–1), Low-intermediate (2), High-intermediate (3), High (4–5) |
| FLIPI / FLIPI-2 | Follicular lymphoma | FLIPI: age >60, stage III–IV, Hb <120 g/L, LDH >ULN, >4 nodal sites | Low (0–1), Intermediate (2), High (≥3) |
Clinical Features & Investigations
Clinical Presentation
Lymphoma presentation varies by subtype, stage, and site of involvement. Painless lymphadenopathy is the most common presenting feature of both HL and NHL. Constitutional (B) symptoms are present in approximately 20–30% of HL and 20–40% of aggressive NHL at diagnosis and indicate more advanced disease.
- Hodgkin lymphoma: Painless cervical or supraclavicular lymphadenopathy (60–80%); mediastinal mass with cough/dyspnoea (NSHL); pruritus; alcohol-induced nodal pain (rare but pathognomonic); B symptoms in ~20–25%
- NHL — nodal: Painless lymphadenopathy (cervical, axillary, inguinal); B symptoms more common in aggressive subtypes
- NHL — extranodal: Gastrointestinal (MALT, DLBCL), skin (CTCL, DLBCL leg type), CNS (primary CNS lymphoma), testis, bone, Waldeyer's ring
- Burkitt lymphoma: Rapidly enlarging abdominal mass, jaw involvement (endemic form), tumour lysis syndrome at presentation
- Richter transformation: CLL transforming to DLBCL — rapid clinical deterioration, new B symptoms, enlarging nodes
Essential Investigations
Management — Chemotherapy Regimens & Radiotherapy
Treatment of lymphoma depends on histological subtype, stage, prognostic score, and patient fitness. Multidisciplinary team (MDT) discussion at a specialised lymphoma centre is mandatory for all new diagnoses in Australia.
Hodgkin Lymphoma — First-Line Therapy
Diffuse Large B-Cell Lymphoma — R-CHOP
Alternative & Salvage Regimens
| Regimen | Indication | Components |
|---|---|---|
| R-CEOP | DLBCL — cardiac contraindication to doxorubicin | Rituximab, cyclophosphamide, etoposide, vincristine, prednisolone |
| R-CVP | Indolent NHL (FL, MZL) — first-line | Rituximab, cyclophosphamide, vincristine, prednisolone |
| Bendamustine + Rituximab (BR) | FL, MCL, CLL/SLL — first-line or relapse | Bendamustine 90 mg/m² IV D1–2 · Rituximab 375 mg/m² IV D1; every 28 days × 6 |
| R-DHAP | Relapsed/refractory DLBCL — salvage pre-ASCT | Rituximab, dexamethasone, high-dose cytarabine, cisplatin |
| R-ICE | Relapsed/refractory DLBCL — salvage pre-ASCT | Rituximab, ifosfamide, carboplatin, etoposide |
| GDP (Gemcitabine, dexamethasone, cisplatin) | Relapsed/refractory HL or NHL — salvage | Gemcitabine 1000 mg/m² IV D1,8 · Dexamethasone 40 mg PO D1–4 · Cisplatin 75 mg/m² IV D1; every 21 days |
| DA-EPOCH-R | Double-hit DLBCL, Burkitt lymphoma, primary mediastinal B-cell lymphoma | Dose-adjusted etoposide, prednisolone, vincristine, cyclophosphamide, doxorubicin, rituximab; 96-hr continuous infusion |
Novel & Targeted Agents (Relapsed/Refractory)
Radiotherapy in Lymphoma
Modern radiotherapy for lymphoma uses involved-site radiotherapy (ISRT) or involved-node radiotherapy (INRT) techniques, significantly reducing treatment volumes compared to historical extended-field approaches. This has markedly reduced late toxicity including secondary malignancies and cardiovascular disease.
| Indication | Dose | Setting |
|---|---|---|
| Early-stage HL (favourable) — consolidation | 20–30 Gy ISRT | After 2–4 cycles ABVD |
| Early-stage HL (unfavourable) — consolidation | 30 Gy ISRT | After 4–6 cycles ABVD |
| Advanced-stage HL — residual PET-positive mass | 30–36 Gy ISRT | After 6 cycles ABVD or BEACOPP |
| Limited-stage DLBCL — consolidation | 30–36 Gy ISRT | After 3–4 cycles R-CHOP |
| Residual mass post-R-CHOP (PET-negative) | 30–40 Gy ISRT | If bulky disease (>7.5 cm) or Deauville 3 |
| Early-stage FL (localised) | 24–30 Gy ISRT | Definitive treatment; 10-yr PFS ~50–60% |
| Primary CNS lymphoma — WBRT consolidation | 23.4–36 Gy | Only if incomplete response to chemotherapy; neurocognitive risk |
Special Populations
Monitoring & Follow-Up
During Treatment
- Blood tests: FBC, LFTs, renal function, electrolytes before each cycle. Myelosuppression nadir typically days 7–14 post-CHOP/ABVD.
- Interim PET-CT: After 2 cycles of ABVD (HL) or 2–4 cycles of R-CHOP (DLBCL) — Deauville score guides continuation of therapy.
- Cardiac monitoring: Echocardiogram or MUGA scan at baseline, then after every 2–3 cycles of anthracycline-containing therapy if cumulative dose approaching cardiotoxic thresholds.
- Pulmonary monitoring: DLCO before each cycle of bleomycin-containing therapy. Discontinue bleomycin if DLCO declines by >25% from baseline.
- HBV monitoring: HBV DNA if HBsAg⁺ or anti-HBc⁺ at baseline — repeat every 3 months during rituximab therapy.
- TLS monitoring: Uric acid, potassium, phosphate, calcium, creatinine at baseline and 12–24 hourly for 48–72 hours in high-risk patients.
End-of-Treatment Assessment
- PET-CT (Deauville criteria): Deauville 1–2 = complete metabolic response (CMR); Deauville 3 = CMR if uptake ≤ mediastinum; Deauville 4–5 = residual disease — consider biopsy or alternative therapy.
- Complete response criteria (Lugano): PET-CMR + no residual masses on CT + normal clinical examination + normal blood counts.
Long-Term Follow-Up
Aboriginal and Torres Strait Islander Health Considerations
📚 References
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