Randomized, Double-blind Study Comparing Tremelimumab to Placebo in Subjects With Unresectable Malignant Mesothelioma


About this study

This is a Phase 2b, randomized, double-blind, parallel-group study. Subjects with unresectable pleural or peritoneal malignant mesothelioma will be randomized in a 2:1 ratio to receive either tremelimumab or placebo. Approximately 564 subjects will be enrolled at study centers in multiple countries. The study consists of a screening period, a treatment period, a 90-day follow-up period for safety, and a long-term survival follow-up period.

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. There is no guarantee that every individual who qualifies and wants to participate in a trial will be enrolled. Contact the study team to discuss study eligibility and potential participation.

Study closed to enrollment

Inclusion Criteria:

  • Histologically and/or cytologically confirmed pleural or peritoneal malignant mesothelioma. Disease not amenable to curative surgery;
  • Age 18 and over at the time of consent;
  • ECOG Performance status 0-1;
  • Progressed after previous receipt of 1-2 prior systemic treatment for advanced disease that included a first-line pemetrexed (or anti-folate)-based regimen in combination with platinum agent;
  • Recovered from all toxicities associated with prior treatment;
  • Measurable disease;
  • Adequate bone marrow, hepatic, and renal function

Exclusion Criteria:

  • Received any prior monoclonal antibody against CTLA-4, programmed cell death 1 (PD1) or programmed cell death 1 ligand 1 (PD-L1);
  • History of chronic inflammatory or autoimmune disease;
  • Active, untreated central nervous system (CNS) metastasis;
  • History of other malignancy unless the subject has been disease-free for at least 3 years;
  • Active or history of diverticulitis. Note that diverticulosis is permitted;
  • Active or history of inflammatory bowel disease (eg, colitis, Crohn's), irritable bowel disease, celiac disease or other serious gastrointestinal chronic conditions associated with diarrhea. Active or history of systemic lupus erythematosis or Wegener's granulomatosis;
  • History of sarcoidosis syndrome;
  • Currently receiving systemic corticosteroids or other immunosuppressive medications;
  • The last dose of prior chemotherapy or radiation therapy (with the exception of palliative radiotherapy) was received less than 2 weeks prior to randomization;
  • Any unresolved toxicity NCI CTCAE Grade ≥ 2 from previous anticancer therapy; with the exception of vitiligo and alopecia.

Participating Mayo Clinic locations

Study statuses change often. Please contact the study team for the most up-to-date information regarding possible participation.

Mayo Clinic Location Status Contact

Scottsdale/Phoenix, Ariz.

Mayo Clinic principal investigator

Helen Ross, M.D.

Closed for enrollment

Contact information:

Cancer Center Clinical Trials Referral Office


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