TheraRadar

Pharma Intelligence, Simplified

Data updated: Mar 10, 2026

LYMPHIR

DENILEUKIN DIFTITOX-CXDL
Oncology Approved 2024-08-07

LYMPHIR is a CD25-directed cytotoxin indicated for the treatment of adult patients with cutaneous T-cell lymphoma (CTCL). It is specifically approved for patients with relapsed or refractory Stage I-III disease who have previously received at least one systemic therapy. This therapeutic agent provides a targeted treatment option for individuals whose cancer has not responded to or has returned after initial systemic interventions.

Source: FDA Label • CITIUS PHARMS • CD25-directed Cytotoxin

How LYMPHIR Works

LYMPHIR is a fusion protein designed to direct the cytocidal action of diphtheria toxin to cells expressing the IL-2 receptor. Once the drug is taken up by the cell, the toxin fragment is cleaved and inhibits protein synthesis, resulting in cell death. This mechanism allows the drug to deplete immunosuppressive regulatory T lymphocytes and exert direct antitumor activity on IL-2 receptor-expressing tumors.

Source: FDA Label
1
Indication
--
Phase 3 Trials
1
Years on Market

Details

Status
Prescription
First Approved
2024-08-07
Routes
INJECTION
Dosage Forms
INJECTABLE

Companies

Active Ingredient: DENILEUKIN DIFTITOX-CXDL

LYMPHIR Approval History

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What LYMPHIR Treats

1 indications

LYMPHIR is approved for 1 conditions since its original approval in 2024. These indications span multiple therapeutic areas including oncology, immunology, and more.

  • Cutaneous T-Cell Lymphoma
Source: FDA Label

LYMPHIR Boxed Warning

CAPILLARY LEAK SYNDROME Capillary leak syndrome (CLS), including life-threatening or fatal reactions, can occur in patients receiving LYMPHIR. Monitor patients for signs and symptoms of CLS during treatment. Withhold LYMPHIR until CLS resolves, or permanently discontinue based on severity [see Dosage and Administration ( 2.1 , 2.4 ) and Warnings and Precautions ( 5.1 )] . WARNING: CAPILLARY LEAK SYNDROME See full prescribing information for complete boxed warning. Capillary leak syndrome (CLS), ...

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Key Completed Trials

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Trial Timeline

Full development history with FDA approval milestones

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Understanding FDA Approval Types
Count Type What it means
- ORIG Original approval - drug first enters market
- SUPPL - Efficacy New indication (new disease/condition approved)
- SUPPL - Labeling Label text changes (warnings, dosing updates)
- SUPPL - Manufacturing Production changes (new facility)
- SUPPL - Chemistry Formulation changes (new dosage strength)

Green lines in the timeline show ORIG and Efficacy approvals - the clinically meaningful milestones.

LYMPHIR FDA Label Details

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Indications & Usage

FDA Label (PDF)

LYMPHIR is indicated for the treatment of adult patients with relapsed or refractory Stage I-III cutaneous T-cell lymphoma (CTCL) after at least one prior systemic therapy. LYMPHIR is an IL2-receptor-directed cytotoxin indicated for the treatment of adult patients with relapsed or refractory Stage I-III cutaneous T-cell lymphoma (CTCL) after at least one prior systemic therapy.

⚠️ BOXED WARNING

WARNING: CAPILLARY LEAK SYNDROME Capillary leak syndrome (CLS), including life-threatening or fatal reactions, can occur in patients receiving LYMPHIR. Monitor patients for signs and symptoms of CLS during treatment. Withhold LYMPHIR until CLS resolves, or permanently discontinue based on severity [...

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Data Sources

Data sourced from official FDA and NIH databases. Click links to verify on original sources.