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Monitoring63 eventsPharmaceutical

Keytruda Organ Failure

Pharmaceutical · claims concerning immune-checkpoint inhibitor injuries, including organ failure or severe immune events

Defendant

Merck Sharp & Dohme LLC

MDL / Track

See litigation status

Judge

Various

Plaintiffs

MONITORING

Bellwether / Trial

No verdicts

Settlement Status

No mass settlement

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← Torts Case overview Litigation status Geographic exposure Key defendants Timeline Statute of limitations Live activity News PubMed openFDA Court filings

Case overview

Plaintiffs allege Merck & Co.'s PD-1 inhibitor Keytruda (pembrolizumab) causes severe immune-mediated organ failure, including acute kidney injury, liver failure, pneumonitis, and colitis, through inadequate warnings. Litigation remains decentralized with no MDL established as of March 2026; cases proceed as individual product liability actions in state and federal courts. Merck halted two Phase 3 trials (KEYNOTE-867 and KEYNOTE-630) in August 2024 after interim analysis showed no survival benefit and higher rates of adverse events including death.

Causation Theory

Keytruda's mechanism—blocking PD-1 to enhance T-cell anti-tumor activity—induces immune-related adverse events by disrupting self-tolerance. A pooled analysis of 8,937 patients across 31 trials (Brahmer et al., Eur J Cancer 2024) found Grade 3–5 adverse events in 50.6% of patients, with immune-mediated events affecting any organ system; 5.9% of patients died from treatment-related causes. A September 2024 Emory University study of metastatic lung cancer patients (TriNetX Research Network) found PD-1 inhibitors like Keytruda carried a 20% pulmonary embolism rate versus 14% for PD-L1 inhibitors. The FDA's Oncologic Drugs Advisory Committee called for restrictions on PD-1 inhibitors in September 2024, citing moderate survival benefits against high toxicity risks.

Litigation status

No active MDL or coordinated federal litigation exists for Keytruda organ failure claims as of March 2026. The search results contain no verified federal product liability dockets, JPML transfer orders, or MDL petitions for this specific theory. FDA label revisions through November 2025 continue to carry warnings for immune-mediated adverse reactions affecting multiple organ systems.

Geographic exposure

Approximately 2,799 patients in pooled safety database (FDA label); 19% discontinuation rate in largest NSCLC monotherapy cohort. No MDL or centralized litigation docket identified as of March 2026; state-specific SOL windows apply for individual immune-mediated adverse reaction claims.

  • United States — Nationwide

    FDA label revisions November 2025 and January 2024 expand immune-mediated adverse reaction warnings to 'any organ system or tissue' with fatality risk; 19% discontinuation rate in KEYNOTE-042 NSCLC monotherapy trial due to adverse reactions including pneumonitis (3.0%), pneumonia (1.4%), and death of unknown cause (1.6%). Source: FDA Label 125514s188 (Nov. 2025), 125514s147 (Jan. 2024)

  • Clinical Trial Sites — KEYNOTE-042

    NSCLC first-line monotherapy sites: 1,251 previously untreated Stage III/metastatic patients; permanent discontinuation 19% (121/636), serious adverse reactions in ≥2% included pneumonitis, pneumonia, and death. Source: Merck Keytruda HCP safety data (2025)

  • Clinical Trial Sites — KEYNOTE-051

    Pediatric oncology sites: 173 pediatric patients aged 6 months to <18 years with cHL, PMBCL, or solid tumors; immune-mediated adverse reactions observed in pediatric population. Source: FDA Label 125514s188

  • Allogeneic HSCT Treatment Centers

    Transplant centers nationwide: FDA warning for fatal and serious complications in patients receiving allogeneic hematopoietic stem cell transplantation before or after PD-1 blockade; GVHD and hyperacute graft-versus-host disease documented. Source: FDA Label 125514s188 Section 5.3

  • Oncology Infusion Centers — Community and Academic

    IV pembrolizumab administration sites: 30-minute infusion protocol; immune-mediated pneumonitis (3.4% in pooled trials) and infusion-related reactions require monitoring. Source: FDA Label 125514s188; Mayo Clinic Drug Information (2026)

Key defendants

Merck Sharp & Dohme LLC

Role: Manufacturer

FDA label (Rev. 11/2025) acknowledges immune-mediated adverse reactions 'may be severe or fatal' and 'can occur in any organ system or tissue.' No MDL currently active; Dunn Sheehan LLP advertising Keytruda organ failure litigation with reported confidential settlements in related pharmaceutical cases. Patent litigation with Halozyme Therapeutics ongoing in D.N.J. over subcutaneous formulation (filed April 2024).

DefendantRoleIntelligence Note
Merck Sharp & Dohme LLCManufacturerFDA label (Rev. 11/2025) acknowledges immune-mediated adverse reactions 'may be severe or fatal' and 'can occur in any organ system or tissue.' No MDL currently active; Dunn Sheehan LLP advertising Keytruda organ failure litigation with reported confidential settlements in related pharmaceutical cases. Patent litigation with Halozyme Therapeutics ongoing in D.N.J. over subcutaneous formulation (filed April 2024).

Timeline

  1. 2014-09

    FDA Approves Keytruda

    FDA grants accelerated approval to pembrolizumab (Keytruda) for advanced melanoma, marking first PD-1 inhibitor approval. Label includes warnings for immune-mediated adverse reactions affecting any organ system.

  2. 2017-01

    Merck Settles Patent Litigation

    Merck enters $625 million settlement and license agreement with Bristol-Myers Squibb and Ono Pharmaceutical, resolving worldwide patent litigation over anti-PD-1 antibodies. Agreement includes royalty payments through 2026.

  3. 2024-01

    FDA Updates Keytruda Label

    FDA approves label revision adding new indications and updated warnings for immune-mediated adverse reactions. Revision date: January 2024.

  4. 2024-08

    Merck Halts Two Phase 3 Trials

    Merck discontinues KEYNOTE-867 (lung cancer) and KEYNOTE-630 (cutaneous squamous cell carcinoma) trials after interim analysis shows no survival benefit and increased risks of immune-mediated adverse events including pneumonitis, colitis, hepatitis, and death.

  5. 2025-07

    FDA Removes Hepatocellular Carcinoma Indication

    FDA removes accelerated approval indication for hepatocellular carcinoma following confirmatory trial failure. Label updated July 2025.

  6. 2025-11

    FDA Approves Expanded Mesothelioma Indication

    FDA approves Keytruda in combination with chemotherapy for malignant pleural mesothelioma. Label revision includes updated immune-mediated adverse reaction warnings.

Live intelligence

AI litigation brief

Keytruda Organ Failure remains monitoring with 63 current signals in the accepted feed.

Overview

No active MDL or coordinated federal litigation exists for Keytruda organ failure claims as of March 2026. The search results contain no verified federal product liability dockets, JPML transfer orders, or MDL petitions for this specific theory. FDA label revisions through November 2025 continue to carry warnings for immune-mediated adverse reactions affecting multiple organ systems.

Key developments

  • Fierce Pharma news on Apr 21: In a Merck Litespark shocker, Welireg triplet misses the mark in first-line kidney cancer - Fierce Pharma
  • FAERS FDA alert on Dec 31: FAERS Filing 26216924: Encephalitis
  • PubMed research on Apr 22: Real-world evidence of immune-related adverse events as predictive factor of response in non-small cell lung cancer.

Trajectory

Press and regulatory signals are moving in tandem for Keytruda. The next escalation check is whether these agency actions prompt new PACER filings or MDL scheduling orders.

Editorial intelligence

Editorial coverage should stay tied to source-backed developments and avoid placeholder status copy for Keytruda.

Generated Apr 28, 2026, 12:00 AM UTC

63 events detected

Google News (13)

  • In a Merck Litespark shocker, Welireg triplet misses the mark in first-line kidney cancer - Fierce Pharma

    Fierce PharmaApr 21, 2026, 2:00 PM UTC
  • Merck and Eisai Provide Update on Phase 3 LITESPARK-012 Trial Evaluating First-Line Combination Treatments for Certain Patients With Advanced Renal Cell Carcinoma (RCC) - Business Wire

    Business WireApr 21, 2026, 10:45 AM UTC
  • (pembrolizumab) and KEYTRUDA QLEX™ (pembrolizumab and berahyaluronidase alfa-pmph), Each with Padcev - Business Wire

    Business WireApr 20, 2026, 10:48 AM UTC
  • FDA Grants Priority Review for KEYTRUDA® (pembrolizumab) and KEYTRUDA QLEX™ (pembrolizumab and berahyaluronidase alfa-pmph), Each with Padcev® (enfortumab vedotin-ejfv), for Cisplatin-Eligible Patients with Muscle-Invasive Bladder Cancer - Yahoo Finance Singapore

    Yahoo Finance SingaporeApr 20, 2026, 10:48 AM UTC
  • European Commission Approves KEYTRUDA® (pembrolizumab) Plus Paclitaxel ± Bevacizumab for the Treatment of Adults With PD-L1 (CPS ?1) Platinum-Resistant Recurrent Ovarian Carcinoma Who Have Received One or Two Prior Systemic Treatment Re - Lelezard

    LelezardApr 2, 2026, 11:16 AM UTC
  • European Commission Approves KEYTRUDA® (pembrolizumab) Plus Paclitaxel ± Bevacizumab for the Treatment of Adults With PD-L1 (CPS ≥1) Platinum-Resistant Recurrent Ovarian Carcinoma Who Have Received One or Two Prior Systemic Treatment R - Business Wire

    Business WireApr 2, 2026, 7:00 AM UTC
  • KEYTRUDA® (pembrolizumab) Plus WELIREG® (belzutifan) Given as Adjuvant Therapy Reduced the Risk of Disease Recurrence or Death by 28% Compared to KEYTRUDA Monotherapy in Certain Patients With Earlier-Stage Renal Cell Carcinoma (RCC) - Business Wire

    Business WireFeb 28, 2026, 8:00 AM UTC
  • KEYTRUDA® (pembrolizumab) Plus WELIREG® (belzutifan) Given as Adjuvant Therapy Reduced the Risk of Disease Recurrence or Death by 28% Compared to KEYTRUDA Monotherapy in Certain Patients With Earlier-Stage Renal Cell Carcinoma (RCC) - Business Wire

    Business WireFeb 28, 2026, 8:00 AM UTC
  • KEYTRUDA® (pembrolizumab) Plus Paclitaxel With or Without Bevacizumab Significantly Improved Key Secondary Endpoint of Overall Survival (OS) Versus Paclitaxel With or Without Bevacizumab in Patients With Platinum-Resistant Recurrent Ovarian Canc - Business Wire

    Business WireFeb 27, 2026, 8:00 AM UTC
  • KEYTRUDA® (pembrolizumab) Plus Padcev® (enfortumab vedotin-ejfv) Reduced Risk of Event-Free Survival Events by 47% and Risk of Death by 35% for Cisplatin-Eligible Patients with Muscle-Invasive Bladder Cancer When Given Before and After Surgery - businesswire.com

    businesswire.comFeb 27, 2026, 8:00 AM UTC
  • KEYTRUDA® (pembrolizumab) Plus Padcev® (enfortumab vedotin-ejfv) Reduced Risk of Event-Free Survival Events by 47% and Risk of Death by 35% for Cisplatin-Eligible Patients with Muscle-Invasive Bladder Cancer When Given Before and After Surgery - Business Wire

    Business WireFeb 26, 2026, 8:00 AM UTC
  • KEYTRUDA® (pembrolizumab) and KEYTRUDA QLEX™ (pembrolizumab and berahyaluronidase alfa-pmph), Plus Paclitaxel ± Bevacizumab, Approved for Certain Adults with PD-L1+ (CPS ≥1) Platinum-Resistant Ovarian Carcinoma as Second or Third Line - Business Wire

    Business WireFeb 11, 2026, 8:00 AM UTC
  • KEYTRUDA® (pembrolizumab) and KEYTRUDA QLEX™ (pembrolizumab and berahyaluronidase alfa-pmph), Plus Paclitaxel ± Bevacizumab, Approved for Certain Adults with PD-L1+ (CPS ≥1) Platinum-Resistant Ovarian Carcinoma as Second or Third Line - Business Wire

    Business WireFeb 11, 2026, 8:00 AM UTC
StudyPubMed
Detected Apr 28, 2026, 12:02 AM UTC

Real-world evidence of immune-related adverse events as predictive factor of response in non-small cell lung cancer.

Farmacia hospitalaria : organo oficial de expresion cientifica de la Sociedad Espanola de Farmacia Hospitalaria • Cercos-Lleti AC • PMID 42025527 • Journal Article.

Confidence 74%Published Apr 22, 2026, 12:00 AM UTCSource →
StudyPubMed
Detected Apr 28, 2026, 12:02 AM UTC

Unilateral Mosaic Pattern of Cutaneous Immune-Related Adverse Event Induced by Pembrolizumab: A Case Report.

The Journal of dermatology • Toichi E • PMID 42015501 • Letter.

Confidence 74%Published Apr 21, 2026, 12:00 AM UTCSource →
StudyPubMed
Detected Apr 28, 2026, 12:02 AM UTC

Immune-related adverse events as predictors of pathological complete response in early-stage triple-negative breast cancer treated with pembrolizumab.

Immunotherapy • Köstek O • PMID 42011533 • Journal Article.

Confidence 74%Published Apr 21, 2026, 12:00 AM UTCSource →
StudyPubMed
Detected Apr 28, 2026, 12:02 AM UTC

Drug-Associated Ketoacidosis: A Comprehensive Disproportionality Analysis Based on the FAERS Database.

Diabetes, obesity & metabolism • Gao H • PMID 42010884 • Journal Article.

Confidence 74%Published Apr 20, 2026, 12:00 AM UTCSource →
StudyPubMed
Detected Apr 28, 2026, 12:02 AM UTC

First-Line Pembrolizumab Monotherapy for Advanced Non-Small Cell Lung Cancer: A Multicenter Real-World Study from Vietnam.

Current oncology (Toronto, Ont.) • Nguyen KT • PMID 42041734 • Journal Article.

Confidence 74%Published Apr 14, 2026, 12:00 AM UTCSource →

No recent court filing signals. Monitoring is active — this section updates automatically.

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LexGenius Ranking

40Score

Fresh items are present but not yet surging

Evidence20 / 20
Momentum10 / 20
Exposure8 / 20
Regulatory8 / 20
Legal6 / 20

Monitoring

Live

monitoring

Last: Apr 28, 2026, 12:00 AM UTC

Next: 42:01

Source Monitoring

PACER

2m 01s

PACER

Pending

Google News

2m 01s

FDA

12m 01s

PubMed

12m 01s

Event feed

63

events detected

Google NewsFDAPubMed

AI Brief

Keytruda Organ Failure remains monitoring with 63 current signals in the accepted feed.

Overview

No active MDL or coordinated federal litigation exists for Keytruda organ failure claims as of March 2026. The search results contain no verified federal product liability dockets, JPML transfer orders, or MDL petitions for this specific theory. FDA label revisions through November 2025 continue to carry warnings for immune-mediated adverse reactions affecting multiple organ systems.

Key developments

Fierce Pharma news on Apr 21: In a Merck Litespark shocker, Welireg triplet misses the mark in first-line kidney cancer - Fierce Pharma. ‖ FAERS FDA alert on Dec 31: FAERS Filing 26216924: Encephalitis. ‖ PubMed research on Apr 22: Real-world evidence of immune-related adverse events as predictive factor of response in non-small cell lung cancer..

Generated Apr 28, 2026, 12:00 AM UTC

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