NCT06395103 · Merck Sharp & Dohme LLC
Substudy 01A: Zilovertamab Vedotin in Pediatric and Young Adult Participants With Hematologic Malignancies or Solid Tumors (MK-9999-01A/LIGHTBEAM-U01)
What this study is about
Substudy 01A is part of a platform study. The purpose of this study is to assess the effectiveness and safety of zilovertamab vedotin in pediatric participants with relapsed or refractory B-cell acute lymphoblastic leukemia (B-ALL), diffuse large B-cell lymphoma (DLBCL)/Burkitt lymphoma, or neuroblastoma and in pediatric and young adult participants with Ewing sarcoma.
View original scientific description
Substudy 01A is part of a platform study. The purpose of this study is to assess the efficacy and safety of zilovertamab vedotin in pediatric participants with relapsed or refractory B-cell acute lymphoblastic leukemia (B-ALL), diffuse large B-cell lymphoma (DLBCL)/Burkitt lymphoma, or neuroblastoma and in pediatric and young adult participants with Ewing sarcoma.
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Exclusion criteria
- include but are not limited to the following: Inclusion Criteria:
- For hematological malignancies: Confirmed diagnosis of B-precursor B-ALL or DLBCL/Burkitt lymphoma according to World Health Organization (WHO) classification of neoplasms of the lymphoid tissues.
- For solid tumor malignancies: Histologically confirmed diagnosis of neuroblastoma or Ewing sarcoma. Exclusion Criteria:
- History of solid organ transplant.
- Clinically significant (ie, active) cardiovascular disease.
- Known history of liver cirrhosis.
- Ongoing Grade \>1 peripheral neuropathy.
- Demyelinating form of Charcot-Marie-Tooth disease.
- Diagnosed with Down syndrome.
- Ongoing graft-versus-host disease (GVHD) of any grade or receiving systemic GVHD treatment or prophylaxis.
- History of human immunodeficiency virus (HIV) infection.
- Contraindication or hypersensitivity to any of the study intervention components.
- Received prior radiotherapy within 4 weeks of star
Where
- Los Angeles, California
- Aurora, Colorado
- New Haven, Connecticut
- St. Petersburg, Florida
- Iowa City, Iowa
- Boston, Massachusetts
- Grand Rapids, Michigan
- Kansas City, Missouri
- New Brunswick, New Jersey
- New York, New York
- Valhalla, New York
- Fargo, North Dakota
And 5 more locations — see the full list below.
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Jun 8, 2026 · Source of record for eligibility and locations