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Study details
Enrolling now

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

Merck Sharp & Dohme LLC
NCT IDNCT06941272ClinicalTrials.gov data as of Apr 2026
Phase

Phase 1/2

Target enrollment

50

Study length

about 5.6 years

Ages

0.0833333333333333–17

Locations

17 sites in CA, CO, CT +13

What this study is about

This trial is testing a treatment called patritumab deruxtecan, an antibody-drug conjugate, in children with relapsed or refractory solid tumors like hepatoblastoma or rhabdomyosarcoma. The goal is to learn about the safety and how the treatment works in these young patients.

Simplified from trial records by PatientMatch.

What you may be asked to do

  • 1.Receive Patritumab Deruxtecan

Participation Burden

What's physically and logistically required of participants.

Logistics & Travel
In-person visits

Requires travel to a study site

Physical Intervention
Standard

How treatment is administered

Treatment Assignment
All receive treatment

Everyone gets the investigational treatment.

Extracted study details

Pulled from the trial record to show what is being tested and what the study is measuring.

Endpoints

Primary: Part 1 and Part 2: Objective Response Rate (ORR), Part 1: AUC of DXd in plasma, Part 1: AUC of anti-HER3 antibody-conjugated DXd (anti-HER3-ac-DXd) in plasma, Part 1: Area Under the Curve (AUC) of total anti-HER3 antibody liquid chromatography-mass spectrometry (LC-MS) in plasma, Part 1: Cmax of DXd in plasma, Part 1: Cmax of anti-HER3-ac-DXd in plasma, Part 1: Maximum Concentration (Cmax) of anti-HER3 antibody LC-MS in plasma, Part 1: Percentage of Participants Who Discontinue Study Treatment Due to an AE

Secondary: Part 1 and Part 2: Disease Control Rate (DCR), Part 1 and Part 2: Duration of Response (DOR), Part 1 and Part 2: Overall Survival (OS), Part 1 and Part 2: Progression-free Survival (PFS), Part 2: AUC of DXd in plasma, Part 2: AUC of anti-HER3-ac-DXd in plasma, Part 2: AUC of total anti-HER3 antibody LC-MS in plasma, Part 2: Cmax of DXd in plasma

Body systems

Oncology