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Radioimmunotherapy (Y-90 anti-CD20)

Ibritumomab tiuxetan

Zevalin · IBRI

Radioimmunotherapy (Y-90 anti-CD20) · approved 2002 · 6 references

A pure beta-emitting anti-CD20 radioimmunoconjugate whose kidney risk is not radiation but tumor lysis in bulky lymphoma.

Signature injury
Prerenal / Hemodynamic AKI
Severity
Mild
Reversibility
Reversible
Onset
TLS is early (hours to days); cytopenias are delayed (weeks).

Signature kidney injury & incidence

Prerenal / Hemodynamic AKI.

Direct renal radiation toxicity is essentially negligible — yttrium-90 is a pure beta-emitter and the kidney is not a critical organ on dosimetry; the dose-limiting toxicity is delayed myelosuppression. The renal hazard is indirect tumor lysis syndrome (TLS) in bulky/high-burden disease; a drug-specific TLS rate is not well quantified and is rare.

Source: Witzig et al., J Clin Oncol 2002

Reported injury signatures: Prerenal / Hemodynamic AKI, Crystal / Obstructive Nephropathy, Electrolyte Disturbance.

Renal toxicity profile

  1. Prerenal / Hemodynamic AKIPrimary
  2. Crystal / Obstructive NephropathyRare
  3. Electrolyte DisturbanceRare

Onset timing & rechallenge

Acute (~1–7 days) — Tumor-lysis AKI is early (hours to days); cytopenias are the delayed, non-renal effect.

Mechanism of kidney injury

No meaningful direct radiation nephropathy: the pure beta-emitter clears with low renal absorbed dose. The kidney injury is metabolic — rapid lymphoma cell lysis releases uric acid and phosphate, producing crystal (urate/calcium-phosphate) nephropathy with intratubular obstruction and hemodynamic AKI. Myelosuppression (the true dose-limiting toxicity) is hematologic, not renal.

Clinical presentation

When TLS occurs: hyperuricemia, hyperkalemia, hyperphosphatemia, hypocalcemia and a rising creatinine within days of therapy. Renal labs are otherwise typically unaffected; the dominant on-label toxicity is delayed cytopenias (nadir ~7-9 weeks).

Management

Standard TLS management: aggressive hydration, urate-lowering (rasburicase for established hyperuricemia), correct electrolytes, and dialysis for severe/refractory derangements. Support cytopenias with transfusion and growth factors. The radioconjugate is not removed by dialysis.

Risk factors

  • Bulky disease / high circulating tumor burden
  • High LDH and rapidly proliferative lymphoma
  • Pre-existing CKD and dehydration
  • High pre-treatment uric acid

Prevention

  • TLS prophylaxis in at-risk/bulky patients: IV hydration plus allopurinol or rasburicase
  • Activity capping by platelet count and marrow involvement (hematologic, not renal, threshold)

Renal dose adjustment

Administered activity is capped by platelet count (e.g. reduced to 0.3 mCi/kg if platelets 100,000-149,000/uL; contraindicated if platelets <100,000/uL or >25% lymphomatous marrow involvement) — a hematologic threshold. No renal CrCl-based dose adjustment is defined; the kidney does not drive dosing.

Dialyzability & ESKD dosing

The radioimmunoconjugate is not dialyzable. Dialysis is relevant only for managing TLS metabolic derangements, not for removing the drug.

Differential diagnosis

Distinguish TLS-driven AKI (urate/phosphate burden, early, post-treatment) from contrast/medication nephrotoxins, lymphomatous renal infiltration or obstruction, and sepsis. Radiation nephropathy is not part of the differential here.

Monitoring

  • CBC weekly for up to ~3 months (marrow nadir surveillance)
  • Electrolytes, uric acid, phosphate and creatinine peri-treatment in TLS-risk patients
  • Volume status/urine output in bulky disease

Key trials & series

  • Pivotal randomized trial of Y-90 ibritumomab vs rituximab (Witzig, J Clin Oncol 2002)
  • Pivotal-trial dosimetry (Wiseman, Crit Rev Oncol Hematol 2001) — kidneys not a critical organ

Clinical pearls

  • Direct renal radiation toxicity is negligible — the renal story is tumor lysis, not the radioisotope.
  • Dosing is limited by platelets and marrow involvement, not by kidney function.
  • Bulky lymphoma is the red flag for TLS prophylaxis with hydration and rasburicase/allopurinol.
  • The dose-limiting toxicity overall is delayed myelosuppression (nadir ~7-9 weeks).

Anticancer mechanism

Murine anti-CD20 monoclonal antibody chelated (tiuxetan) to yttrium-90, a pure high-energy beta-emitter. After a rituximab pre-dose to clear circulating B cells, the radioconjugate binds CD20 on B-cell non-Hodgkin lymphoma, delivering cross-fire beta radiation plus antibody-mediated cytotoxicity (radioimmunotherapy).

Note

Established (2002) agent; no dedicated renal cohort exists because direct renal toxicity is not a recognized effect. Renal framing rests on the pivotal dosimetry (kidney non-critical) plus the TLS literature for bulky lymphoma.

Guidelines & consensus

Each recommendation below is this atlas's faithful summary of the source, not a quotation from it — follow the PubMed link for the wording the society published. Summaries may be superseded; consult the current full text and individualize to the patient.

  • ADQI (2026) — The nephrotoxic effects of anti-cancer therapies: consensus report of the 34th Acute Disease Quality Initiative workgroupProvides expert-based statements (modified Delphi) on preventing and managing cisplatin/platinum-associated AKI, including isotonic IV hydration, attention to volume status and concomitant nephrotoxins, and incorporates evidence that IV magnesium supplementation may reduce cisplatin-associated AKI; emphasizes risk stratification and standardized AKI definitions.Nat Rev Nephrol · PMID 41361704
  • SIRM (2022) — SIRM-SIN-AIOM: appropriateness criteria for evaluation and prevention of renal damage in the patient undergoing contrast medium examinations-consensus statements from Italian College of Radiology (SIRM), Italian College of Nephrology (SIN) and Italian Association of Medical Oncology (AIOM)Recommends eGFR-based renal risk assessment and pre/post-contrast isotonic saline or sodium bicarbonate hydration; advises maintaining a 5-7 day interval between iodinated contrast administration and cisplatin in cancer patients to reduce additive nephrotoxicity.Radiol Med · PMID 35303246
  • KDIGO (2020) — KDIGO Controversies Conference on onco-nephrology: understanding kidney impairment and solid-organ malignancies, and managing kidney cancerIdentifies platinum compounds (especially cisplatin) as leading cytotoxic causes of acute tubular injury, AKI, and electrolyte/magnesium wasting; calls for interdisciplinary onco-nephrology care, accurate GFR estimation, and individualized drug dosing in patients with reduced kidney function.Kidney Int · PMID 33126977
  • KDIGO (2020) — KDIGO Controversies Conference on onco-nephrology: kidney disease in hematological malignancies and the burden of cancer after kidney transplantationAddresses chemotherapy-associated AKI/CKD in hematologic cancer, GFR estimation and chemotherapy dosing in patients with reduced kidney function, and management priorities and research gaps for onco-nephrology care.Kidney Int · PMID 33276867
  • ADDIKD (2025) — Integrating International Consensus Guidelines for Anticancer Drug Dosing in Kidney Dysfunction (ADDIKD) into everyday practiceProvides GRADE-based, drug-specific dose-adjustment recommendations for anticancer agents in kidney dysfunction (illustrated for methotrexate, cisplatin, carboplatin and nivolumab); the recommendations build on Part 1's standardised CKD-EPI eGFR assessment rather than Cockcroft-Gault creatinine clearance.EClinicalMedicine · PMID 40290844
  • ADDIKD (2025) — Aligning kidney function assessment in patients with cancer to global practices in internal medicineThree consensus recommendations: assess kidney function by GFR (measured GFR or CKD-EPI eGFR), classify it using KDIGO categories, and use this uniform approach to dose anticancer drugs — moving cancer medicine away from Cockcroft-Gault estimated creatinine clearance.EClinicalMedicine · PMID 40290845
  • ADDIKD (2025) — A methodology for determining dosing recommendations for anticancer drugs in patients with reduced kidney functionEstablishes that, where RCT evidence is lacking, anticancer drug dosing recommendations in kidney dysfunction should be derived by critically appraising observational literature via GRADE combined with structured international multidisciplinary consensus voting.EClinicalMedicine · PMID 40290846
  • KDIGO (2013) — Diagnosis, evaluation, and management of acute kidney injury: a KDIGO summary (Part 1)Defines/stages AKI by serum creatinine and urine output; emphasizes avoiding nephrotoxins, maintaining euvolemia/perfusion, dose-adjusting drugs to kidney function, and monitoring high-risk patients — the framework applied to nephrotoxic anti-cancer agents.Crit Care · PMID 23394211
  • KDIGO (2024) — Executive summary of the KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease: known knowns and known unknownsEvaluate and risk-stratify CKD, manage to delay progression and its complications, and practise explicit medication management and drug stewardship — the framework the atlas's G1–G5 eGFR banding and every renal dose-adjustment recommendation sit inside. Because the guideline excludes dialysis and transplant recipients by its own statement of scope, its recommendations do not carry to those settings, where this atlas's dialyzability and post-transplant guidance rests on other sources.Kidney Int · PMID 38519239
  • KDIGO (2021) — Executive summary of the KDIGO 2021 Guideline for the Management of Glomerular DiseasesProvides the staging/treatment framework for drug-associated glomerular lesions (e.g., bisphosphonate- and interferon-related collapsing FSGS, VEGF-inhibitor podocytopathy/proteinuria), including immunosuppression and supportive RAAS-blockade strategies.Kidney Int · PMID 34556300
  • KDIGO (2024) — Executive summary of the KDIGO 2024 Clinical Practice Guideline for the Management of ANCA-Associated VasculitisUpdates immunosuppressive induction (rituximab/cyclophosphamide), incorporates avacopan and lower-dose or glucocorticoid-sparing regimens — the management framework for drug- and checkpoint-inhibitor-associated ANCA/pauci-immune glomerulonephritis.Kidney Int · PMID 38388147
  • KDIGO (2024) — Executive summary of the KDIGO 2024 Clinical Practice Guideline for the Management of Lupus NephritisUpdates first-line lupus nephritis therapy to combination immunosuppression with the addition of belimumab or a calcineurin inhibitor (voclosporin) — informs management of immune-complex/lupus-like glomerulonephritis encountered with immunotherapy.Kidney Int · PMID 38182299
  • KDIGO (2025) — Executive summary of the KDIGO 2025 Clinical Practice Guideline for the Management of Immunoglobulin A Nephropathy (IgAN) and Immunoglobulin A Vasculitis (IgAV)Encourages liberal kidney biopsy and stricter proteinuria control (<0.5 g/d, ideally <0.3 g/d) with RAAS blockers, SGLT2 inhibitors, and targeted-release budesonide — the framework for IgA-dominant glomerular lesions, including those triggered by immune-modulating cancer therapy.Kidney Int · PMID 40975525

References

6 peer-reviewed references. Citation metadata via PubMed / NLM.

  1. 1.Randomized controlled trial of yttrium-90-labeled ibritumomab tiuxetan radioimmunotherapy versus rituximab immunotherapy for patients with relapsed or refractory low-grade, follicular, or transformed B-cell non-Hodgkin's lymphoma.Witzig TE et al. · J Clin Oncol · 2002 · PMID 12011122
  2. 2.Biodistribution and dosimetry results from a phase III prospectively randomized controlled trial of Zevalin radioimmunotherapy for low-grade, follicular, or transformed B-cell non-Hodgkin's lymphoma.Wiseman GA et al. · Crit Rev Oncol Hematol · 2001 · PMID 11418315
  3. 3.Additional radiation absorbed dose estimates for Zevalin radioimmunotherapy.Wiseman GA et al. · Cancer Biother Radiopharm · 2003 · PMID 12804052
  4. 4.Yttrium 90-labeled ibritumomab tiuxetan radioimmunotherapy produces high response rates and durable remissions in patients with previously treated B-cell lymphoma.Gordon LI et al. · Clin Lymphoma · 2004 · PMID 15453924
  5. 5.Monoclonal antibodies in the treatment of cancer, Part 1.Cersosimo RJ et al. · Am J Health Syst Pharm · 2003 · PMID 12951753
  6. 6.Unique aspects of supportive care using monoclonal antibodies in cancer treatment.Dillman RO et al. · Support Cancer Ther · 2003 · PMID 18628130
Educational monograph from NephTox (nephtox.com). Not medical advice — verify against current guidelines before any clinical decision.