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Study identifier: NCT06941272 Synced from ClinicalTrials.gov · July 28, 2026
● Recruiting

A Study of Patritumab Deruxtecan in Pediatric Participants With Relapsed or Refractory Solid Tumors (MK-9999-01C/LIGHTBEAM-U01)

Condition: Malignant Neoplasm  ·  Sponsor: Merck Sharp & Dohme LLC

PhasePhase 1/Phase 2
Planned participants50
Who can joinAll sexes, 1 Month to 17 Years
Healthy volunteersNo

About this study

Researchers are looking for new ways to treat children with hepatoblastoma or rhabdomyosarcoma (RMS) that has relapsed or is refractory: * Hepatoblastoma is a common liver cancer in babies and very young children * RMS is a cancer that starts in muscle cells, often in a child's head and neck, bladder, arms, or legs * Relapsed means the cancer came back after treatment * Refractory means the cancer did not respond (get smaller or go away) to treatment The study treatment HER3-DXd (also known as MK-1022 or patritumab deruxtecan) is an antibody-drug conjugate (ADC). An ADC attaches to a protein on cancer cells and delivers treatment to destroy those cells. The goals of this study are to learn: * About the safety of HER3-DXd in children and if they tolerate it * What happens to HER3-DXd in children's bodies over time * If children who receive HER3-DXd have the cancer get smaller or go away

This description comes directly from the study's public registry record.

Talk to the study team

Toll Free Number  ·  1-888-577-8839  ·  Trialsites@msd.com

Always discuss trial participation with your own doctor first.

Locations (63)

Childrens Hospital Los Angeles ( Site 3006)Los Angeles, California, United StatesRecruiting
Children's Hospital Colorado-Center for Cancer and Blood Disorders ( Site 3016)Aurora, Colorado, United StatesRecruiting
Yale New Haven Hospital ( Site 3012)New Haven, Connecticut, United StatesRecruiting
Johns Hopkins All Children's Hospital ( Site 3025)St. Petersburg, Florida, United StatesRecruiting
University of Iowa Health Care Holden Comprehensive Cancer Center ( Site 3017)Iowa City, Iowa, United StatesRecruiting
Dana-Farber Cancer Institute ( Site 3013)Boston, Massachusetts, United StatesRecruiting
Corewell Health ( Site 3001)Grand Rapids, Michigan, United StatesRecruiting
Children's Mercy Hospital ( Site 3024)Kansas City, Missouri, United StatesRecruiting
Rutgers Cancer Institute of New Jersey ( Site 3008)New Brunswick, New Jersey, United StatesRecruiting
Memorial Sloan Kettering Cancer Center ( Site 3010)New York, New York, United StatesRecruiting
New York Medical College ( Site 3023)Valhalla, New York, United StatesRecruiting
Sanford Fargo Medical Center-Roger Maris Cancer Center ( Site 3003)Fargo, North Dakota, United StatesRecruiting

+ 51 more locations — full list on the registry record.

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Source record: clinicaltrials.gov/study/NCT06941272