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IL-3 immunotoxin

Tagraxofusp

Elzonris · Tagrax

IL-3 immunotoxin · approved 2018 · 6 references

A CD123-directed diphtheria-toxin fusion whose capillary leak can collapse the circulation and the kidneys.

Signature injury
Prerenal / Hemodynamic AKI
Severity
Moderate
Reversibility
Partially reversible
Onset
Typically during the first treatment cycle, often within days of the first doses; recurrence in later cycles is uncommon with proactive monitoring.

Signature kidney injury & incidence

Prerenal / Hemodynamic AKI.

Capillary leak syndrome (CLS) is a boxed-warning toxicity occurring in ~19-21% of treated patients in the registrational trial (mostly grade 2; grade >=3 in ~4% — 2% grade 3 plus 2% grade 4 — with two deaths); the resulting hypotension, hypoalbuminemia, and fluid shifts can precipitate prerenal AKI and, with prolonged hypoperfusion, ischemic ATN. Renal-specific AKI incidence is not separately quantified.

Source: Pemmaraju et al., J Clin Oncol 2022

Reported injury signatures: Prerenal / Hemodynamic AKI, Acute Tubular Necrosis.

Renal toxicity profile

  1. Prerenal / Hemodynamic AKIPrimary~19%Capillary leak syndrome in 19% of patients in the pivotal BPDCN trial (fatal in one patient per dose subgroup); CLS drives intravascular volume depletion / prerenal physiology
  2. Acute Tubular NecrosisSecondary

Onset timing & rechallenge

Acute (~1–7 days) — Usually during the first cycle, often within days of the first doses.

Rechallenge: Often tolerated — Recurrence in later cycles is uncommon with proactive monitoring.

Mechanism of kidney injury

Endothelial injury from the diphtheria-toxin immunotoxin (CD123 is also expressed on endothelium) produces a systemic capillary-leak state: intravascular fluid and albumin extravasate into the interstitium, causing hypoalbuminemia, edema, weight gain, and hypotension. The fall in effective circulating volume drives prerenal azotemia and, when severe or prolonged, ischemic acute tubular necrosis.

Clinical presentation

Weight gain, peripheral and pulmonary edema, hypoalbuminemia (often <3.0 g/dL), hypotension, and rising creatinine, usually in cycle 1. Falling serum albumin and rising weight are the earliest CLS signals; severe cases progress to shock and pulmonary edema.

Management

Treat CLS aggressively: corticosteroids, IV albumin to support oncotic pressure, judicious fluid management, and interruption of tagraxofusp. Support blood pressure and renal perfusion (vasopressors if needed). Most AKI is prerenal and improves with CLS resolution; established ATN requires standard supportive care and occasionally renal replacement therapy.

Risk factors

  • Low baseline serum albumin (<3.2 g/dL)
  • Pre-existing cardiac or volume-overload states
  • First cycle of therapy
  • Pre-existing low platelet count / bleeding risk amplifying hemodynamic instability

Prevention

  • Require serum albumin >= 3.2 g/dL before the first dose and before each subsequent dose
  • Premedicate (corticosteroids, antihistamines, antipyretics) and give prompt corticosteroids and albumin at the first CLS signs; hold dosing per protocol

Renal dose adjustment

No established renal dose adjustment (clearance is proteolytic, not renal). Dosing decisions hinge on albumin, weight, and CLS status rather than eGFR.

Dialyzability & ESKD dosing

Large fusion protein cleared by proteolysis; not dialyzable. Hemodialysis/CRRT is used to support AKI/volume overload, not to remove the drug.

Differential diagnosis

Tagraxofusp CLS-driven prerenal AKI/ATN (hypoalbuminemia, weight gain, edema in cycle 1) vs sepsis/neutropenic shock vs cardiogenic edema vs tumor-related fluid overload. Hypoalbuminemia with weight gain and hemoconcentration points to CLS.

Monitoring

  • Serum albumin before each dose (hold if <3.2 g/dL)
  • Daily weight and blood pressure during cycle 1
  • Edema, oxygen saturation, and signs of pulmonary edema
  • Daily serum albumin during cycle 1 inpatient observation

Key trials & series

  • Pemmaraju phase 1/2 pivotal BPDCN trial (NEJM 2019) and JCO 2022 long-term follow-up
  • Pemmaraju & Konopleva Blood Adv 2020 approval review

Clinical pearls

  • Albumin is the vital sign for tagraxofusp - do not dose if <3.2 g/dL.
  • CLS clusters in cycle 1; intensive monitoring then prevents most severe events.
  • The AKI is a hemodynamic consequence of capillary leak, not a direct tubular toxin - fix the circulation and the kidney follows.

Anticancer mechanism

Recombinant fusion of interleukin-3 (IL-3) and truncated diphtheria toxin that binds the IL-3 receptor alpha chain (CD123) overexpressed on malignant cells, internalizes, and the diphtheria-toxin payload ADP-ribosylates elongation factor 2 to halt protein synthesis and trigger apoptosis. First approved therapy for blastic plasmacytoid dendritic cell neoplasm (BPDCN).

Note

Capillary-leak syndrome carries a boxed warning; renal injury is a downstream consequence of endothelial leak and hemodynamic collapse rather than direct tubular toxicity.

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.Long-Term Benefits of Tagraxofusp for Patients With Blastic Plasmacytoid Dendritic Cell Neoplasm.Pemmaraju N et al. · J Clin Oncol · 2022 · PMID 35820082
  2. 2.Optimizing capillary leak syndrome prevention and management in patients receiving tagraxofusp for blastic plasmacytoid dendritic cell neoplasm.Lane AA et al. · Leuk Lymphoma · 2025 · PMID 41134616
  3. 3.Approval of tagraxofusp-erzs for blastic plasmacytoid dendritic cell neoplasm.Pemmaraju N et al. · Blood Adv · 2020 · PMID 32841341
  4. 4.Blastic Plasmacytoid Dendritic Cell Neoplasm.Jain A et al. · J Natl Compr Canc Netw · 2023 · PMID 37156483
  5. 5.Reversible Myocardial Edema Secondary to Tagraxofusp-Induced Capillary Leak Syndrome.Mouhayar EN et al. · JACC CardioOncol · 2021 · PMID 34988487
  6. 6.Efficacy of first-line tagraxofusp in blastic plasmacytoid dendritic cell neoplasm with prior or concomitant hematologic malignancy: subgroup analysis of a pivotal trial.Pemmaraju N et al. · Leuk Lymphoma · 2025 · PMID 40067964

Case reports & series (1)

The weakest rung of clinical evidence — single-patient and small-series reports, strongest first. Each carries a heuristic strength grade (A Strong / B Moderate / C Limited) inferred from its abstract and journal, not a formal appraisal. Weigh well below the primary references above.

  1. C1.[C · Limited]Sustained response to minimal-dose tagraxofusp in a patient with BPDCN and advanced chronic kidney disease.Brummer C et al. · Ann Hematol · 2026 · PMID 41535617
Educational monograph from NephTox (nephtox.com). Not medical advice — verify against current guidelines before any clinical decision.