Clinical trial No longer in our active list Phase 3 Interventional Ages 18 and up

Combination treatment for newly diagnosed glioblastoma using Optune, Temozolomide, and Pembrolizumab

Official title: A Phase 3, Randomized, Double-Blind, Placebo-Controlled Study of Optune® (TTFields, 200 kHz) Concomitant With Maintenance Temozolomide and Pembrolizumab Versus Optune® Concomitant With Maintenance Temozolomide and Placebo for the Treatment of Newly Diagnosed Glioblastoma (EF-41/KEYNOTE D58).

Run by NovoCure Ltd. · NCT06556563 · Data updated 2026-05-14

This study is no longer in our active list. It may have stopped recruiting or finished. The details below are as of 2026-05-14 and are kept for reference. Check ClinicalTrials.gov for its current status, or see similar studies below.

This study is testing a new combination of treatments using a special device and two medications to see if it helps people with newly diagnosed glioblastoma live longer.

Quick facts

PhasePhase 3
Study typeInterventional
Ages18 Years and up
SexAll
Enrollment741 (estimated)
SponsorNovoCure Ltd.
Industry-sponsored
Drugs / interventionschemotherapy, prednisone, pembrolizumab
Locations93 sites (Phoenix, Arizona and 92 other locations)
Trial IDNCT06556563 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are adults aged 18 and older with a new diagnosis of glioblastoma who have completed initial treatment and are stable on corticosteroids.

Probably not a fit

Patients with advanced disease or those who have not recovered from surgery may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This phase 3 clinical trial evaluates the effectiveness of the Optune® device, which delivers Tumor Treating Fields, in combination with the chemotherapy agent Temozolomide and the immunotherapy Pembrolizumab in patients with newly diagnosed glioblastoma. The study is multicenter, randomized, and double-blind, comparing the active treatment group to a placebo group receiving the same regimen without Pembrolizumab. The primary goal is to assess overall survival among participants. Eligible patients must have recovered from surgery and completed standard adjuvant chemoradiotherapy.

Why it matters

Potential benefit: If successful, this treatment approach could significantly improve survival rates for patients with newly diagnosed glioblastoma.

How similar studies have gone: Previous studies have shown promise with similar combinations of immunotherapy and chemotherapy in glioblastoma, but this specific approach is novel.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

1. The participant (or legally acceptable representative) has provided documented informed consent for the study.
2. Be ≥ 18 years of age on day of providing informed consent.
3. Participant with new diagnosis of GBM according to World Health Organization (WHO) 2021 Classification.
4. Recovered from maximal debulking surgery (gross total resection, partial resection and biopsy-only patients are all acceptable), Gliadel wafers placement at the time of surgical resection is not allowed.
5. Have completed standard adjuvant chemoradiotherapy of radiotherapy (RT) according to local practice (56-64 Gy), and concomitant TMZ chemotherapy.
6. Amenable to treatment with Optune concomitant with maintenance TMZ (150-200 mg/m\^2 daily x 5, Q28 days).
7. Have an Eastern Cooperative Oncology Group (ECOG) Performance Status of 0 to 1 assessed within 7 days before randomization.
8. Stable or decreasing dose of corticosteroids (dexamethasone ≤ 2mg or equivalent) for the last 7 days prior to randomization, if applicable.

Exclusion Criteria:

1. Has received prior therapy with an anti-Programmed Cell Death 1 (PD-1), anti- Programmed Cell Death-Ligand 1(PD-L1), or anti Programmed Cell Death-Ligand 2 (PD-L2) agent or with an agent directed to another stimulatory or co-inhibitory T-cell receptor (e.g.Cytotoxic T-Lymphocyte-Associated protein 4 (CTLA-4), OX 40, CD137).
2. Ongoing requirement for \>2 mg dexamethasone (or equivalent), due to intracranial mass effect.
3. Has received prior systemic anti-cancer therapy including investigational agents within 4 weeks prior to randomization.
4. Received a live or live-attenuated vaccine within 30 days before the first dose of study intervention. Administration of killed vaccines are allowed.
5. Is currently participating in or has participated in a study of an investigational agent or has used an investigational device within 4 weeks prior to the first study treatment.
6. Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior the first dose of study medication. Has a known additional malignancy that is progressing or has required active treatment within the past 3 years.
7. Has a history of (noninfectious) pneumonitis/interstitial lung disease that required steroids or has current pneumonitis/interstitial lung disease.
8. Early progressive disease after the end of TMZ/RT. If pseudo progression is suspected, additional imaging studies should be performed to rule out true progression.
9. Infratentorial or leptomeningeal disease.

Where it's running

  • Mayo Clinic Hospital
    Phoenix, Arizona, United States
    Recruiting
  • University of Southern California
    Los Angeles, California, United States
    Recruiting
  • Hoag Memorial Hospital Presbyterian
    Newport Beach, California, United States
    Recruiting
  • Stanford Cancer Institute
    Palo Alto, California, United States
    Recruiting
  • University of California
    San Francisco, California, United States
    Recruiting
  • UF Health Neuromedicine
    Gainesville, Florida, United States
    Recruiting
Show 44 more locations
  • Mayo Clinic - Florida
    Jacksonville, Florida, United States
    Recruiting
  • Miami Cancer Institute
    Miami, Florida, United States
    Recruiting
  • Moffitt Cancer Center
    Tampa, Florida, United States
    Recruiting
  • Northwestern Memorial Hospital
    Chicago, Illinois, United States
    Recruiting
  • University of Kentucky Medical Center
    Lexington, Kentucky, United States
    Recruiting
  • University of Maryland
    Baltimore, Maryland, United States
    Recruiting
  • Tufts Medical Center
    Boston, Massachusetts, United States
    Recruiting
  • Masonic Cancer Center, University of Minnesota
    Minneapolis, Minnesota, United States
    Recruiting
  • Mayo Clinic - Rochester
    Rochester, Minnesota, United States
    Recruiting
  • Washington University
    St Louis, Missouri, United States
    Recruiting
  • Renown Regional Medical Center
    Reno, Nevada, United States
    Recruiting
  • John Theurer Cancer Center/ Hackensack Meridian Health
    Hackensack, New Jersey, United States
    Recruiting
  • Northwell Health
    Lake Success, New York, United States
    Recruiting
  • Columbia University Irving Medical Center
    New York, New York, United States
    Recruiting
  • Montefiore Medical Center- Montefiore Medical Park
    The Bronx, New York, United States
    Recruiting
  • Duke University Medical Center
    Durham, North Carolina, United States
    Recruiting
  • University Hospitals Cleveland Medical Center
    Cleveland, Ohio, United States
    Recruiting
  • The Cleveland Clinic
    Cleveland, Ohio, United States
    Recruiting
  • Thomas Jefferson University, Sidney Kimmel Comprehensive Cancer Center, Clinical Trials Organization
    Philadelphia, Pennsylvania, United States
    Recruiting
  • UPMC Hillman Cancer Center
    Pittsburgh, Pennsylvania, United States
    Recruiting
  • Rhode Island Hospital
    Providence, Rhode Island, United States
    Recruiting
  • The University of Texas
    Houston, Texas, United States
    Recruiting
  • University of Texas, MD Anderson Cancer Center
    Houston, Texas, United States
    Recruiting
  • Huntsman Cancer Institute, University of Utah
    Salt Lake City, Utah, United States
    Recruiting
  • Inova Schar Cancer Institute
    Fairfax, Virginia, United States
    Recruiting
  • Swedish Medical Center
    Seattle, Washington, United States
    Recruiting
  • The Ottawa Hospital Cancer Centre
    Ottawa, Ontario, Canada
    Recruiting
  • Chum
    Montreal, Quebec, Canada
    Recruiting
  • Montreal Neurological Institute-Hospital, Clinical Research Unit
    Montreal, Quebec, Canada
    Recruiting
  • Centre intégré universitaire de santé et de services sociaux de l'Estrie - Centre hospitalier universitaire de Sherbrooke (CIUSSS de l'Estrie-CHUS)
    Sherbrooke, Quebec, Canada
    Recruiting
  • Nemocnice Na Homolce
    Prague, Czechia
    Recruiting
  • Centre Hospitalier Universitaire de Lyon
    Bron, France
    Recruiting
  • Hopital de la Timone
    Marseille, France
    Recruiting
  • Hopital Saint-Louis
    Paris, France
    Recruiting
  • Groupe Hospitalier Pitie - Salpetriere
    Paris, France
    Recruiting
  • Institut Claudius Regaud
    Toulouse, France
    Recruiting
  • Charité Campus Virchow-Klinikum
    Berlin, Germany
    Recruiting
  • Universitätsklinikum Essen
    Essen, Germany
    Recruiting
  • University Hospital Frankfurt
    Frankfurt, Germany
    Recruiting
  • Rambam Medical Center
    Haifa, Israel
    Recruiting
  • Rabin Medical Center- Beilinson Hospital
    Petah Tikva, Israel
    Recruiting
  • Chaim Sheba Medical Center
    Ramat Gan, Israel
    Recruiting
  • Tel-Aviv Sourasky Medical Center
    Tel Aviv, Israel
    Recruiting
  • Neuro-Oncologia Clinica Ospedale Molinette - AOU Città della Salute e della Scienza di Torino
    Torino, Torino, Italy
    Recruiting

+43 more sites. See ClinicalTrials.gov for the full list.

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.