Dupixent & CTCL Lawsuits
Diagnosed with CTCL After Using Dupixent?
Patients across the country have filed lawsuits alleging that Dupixent contributed to their CTCL diagnoses and that its manufacturers failed to provide adequate warnings. MedLaw Group helps individuals and families explore potential legal claims and work with experienced litigation counsel.
Why Patients Are Pursuing Dupixent CTCL Claims
Patients who developed CTCL after receiving Dupixent are pursuing legal claims against Sanofi and Regeneron, alleging that the manufacturers failed to provide adequate warnings about potential risks.
One important issue is that early CTCL can resemble eczema and other inflammatory skin conditions. For some patients, the diagnosis only became clear after persistent symptoms, additional testing, or changes during treatment. Their medical histories may raise important questions about when the disease developed, how it progressed, and whether it could have been recognized earlier.
These concerns are not limited to patients who took Dupixent for eczema. Individuals who received Dupixent for asthma, nasal polyps, or other approved conditions and were later diagnosed with CTCL or a related T-cell lymphoma can also request a free initial case review.
Legal Experience Behind MedLaw Group
MedLaw Group brings pharmaceutical and biotechnology legal experience and a background in complex federal litigation to potential Dupixent CTCL claims. We help individuals and families understand their legal options, with access to experienced national litigation counsel when appropriate.
Keke Feng, Esq.
California attorney with federal complex litigation experience
Understand Your Legal Options
Dupixent & CTCL Medical Background
Understand CTCL, related diagnoses, and the medical questions underlying potential legal claims.
Read Dupixent & CTCLDupixent Lawsuits & MDL Developments
Follow Dupixent lawsuit allegations, JPML filings, and developments in MDL No. 3180.
Read Litigation UpdatesCould Your Case Qualify?
Learn how diagnosis, Dupixent treatment history, timing, and medical records inform a potential legal claim.
Understand Key Case FactorsInformation That Helps Assess Your Potential Claim
Helpful starting information includes approximate Dupixent treatment dates, the CTCL-related diagnosis name, dermatology or oncology records, pathology reports, symptom timeline notes, and whether biopsy, specialist review, or second opinion was involved.
Frequently Asked Questions
Who is this site for?
This site is for people who used Dupixent and were later diagnosed with CTCL, mycosis fungoides, Sézary syndrome, or another related T-cell lymphoma, and who want to explore their potential legal claims.
What diagnoses are the focus of this site?
This site is focused on CTCL and related T-cell lymphoma diagnoses, including mycosis fungoides and Sézary syndrome. Other cancers or unrelated lymphoma diagnoses may involve different medical and legal questions.
What do Dupixent CTCL lawsuits allege?
Plaintiffs allege that Dupixent contributed to CTCL diagnoses and that its manufacturers failed to provide adequate warnings. Court filings, medical literature, adverse-event data, and regulatory materials inform the litigation. Causation and liability remain disputed; each potential claim depends on individual facts.
What information helps attorneys assess a potential claim?
Helpful information includes Dupixent treatment dates, the diagnosis received, dermatology or oncology records, pathology reports, and a short timeline of symptoms, treatment, and diagnosis. You can request a free initial case review without having every record ready.
Does submitting a form create an attorney-client relationship?
No. Submitting information requests an initial review only and does not create an attorney-client relationship or mean a matter has been accepted.
About This Information
This page draws on court filings, medical literature, adverse-event data, and regulatory materials. Reported associations and safety signals do not establish causation. No court has made a final determination on the allegations discussed here.
Last reviewed by Keke Feng, Esq. — October 12, 2026
Start Free Case Review
If you used Dupixent and were later diagnosed with CTCL or another related T-cell lymphoma, request a free initial case review to explore your potential legal options. Legal deadlines may vary by state, and diagnosis timing can matter.