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Study details
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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

About this study

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.

Based on ClinicalTrials.gov records.

What participants do

  • 1.Receive Patritumab Deruxtecan
PhasePhase 1/Phase 2
Primary goalPart 1 and Part 2: Objective Response Rate (ORR)

Participation effort

Estimated from trial records. Details can vary by site.

Time + visits
Low10%
Logistics
Moderate50%

Logistics difficulty varies by site location and availability.

Trial highlights

Treatment details

Auto-extracted from trial records to preview treatments and outcomes.

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