NCT05588648

Study to Assess Safety and Efficacy of Vactosertib in Adolescents and Adults With Recurrent, Refractory or Progressive Osteosarcoma

A Phase I/II, Open-label, Multicenter Study to Assess the Safety, Tolerability, Pharmacokinetics, and Antitumor Activity of Vactosertib as a Single Agent in Adolescents and Adults With Recurrent, Refractory or Progressive Osteosarcoma

• Status: Recruiting
• Phase: Phase 1 / Phase 2
• Study type: Interventional
• Enrollment: 48 (estimated)
• Sponsor: MedPacto, Inc. · Industry
• Sex: All
• Age: 12 Years
• Healthy volunteers: Not accepted

Summary

MP-VAC-209 is a Phase I/II, open label, single arm, multi-center study to assess safety, tolerability, and antitumor activity of vactosertib as a single agent in adolescents and adults with recurrent, refractory, or progressive osteosarcoma. Vactosertib is given orally, twice a day, to people 12 years of age and older who meet the criteria for study enrollment.

Detailed description

This is a Phase I/II, open label, single arm, proof of concept, multi-center (global) study to assess safety, tolerability, pharmacokinetics and antitumor activity of vactosertib as a Single Agent in Adolescents and Adults with Recurrent, Refractory or Progressive Osteosarcoma or bone lesions that have progressed, relapsed or are refractory to standard systemic therapy. Adolescents are defined as subjects aged 12 to \<18-year-old. During the Phase I part of the trial, dose limiting toxicity will be used to decide dose escalation according to the standard 3+3 rules to determine the maximum tolerated dose (MTD) and the recommended phase II dose (RP2D) in adults and adolescents. Dose escalation will be conducted sequentially and independently in adults and adolescents, respectively. Dose escalation in adolescents will not start before dose escalation in adults is completed. Data from the Phase I part of the trail in adults will be reviewed by the DSMB before opening the Phase II part. Data from the Phase I in adolescents will be reviewed by the DSMB before each dose (de-)escalation. As soon as the RP2D in adolescents is established, adolescents will be enrolled in Phase II. During Phase II, subjects will be enrolled at the RP2D determined independently for adults and adolescents. Data of the subjects enrolled in the Phase II will be pooled with data of subjects enrolled at the same dose level during Phase I to evaluate the efficacy in a total of 42 adult and adolescent subjects. In all parts of the study, the DSMB will convene upon occurrence of a grade 5 or any two sequentially occurring grade 4 drug related adverse events. In such case, accrual may not resume unless the DSMB has conducted a review and offered a recommendation to continue the study.

Conditions

• Osteosarcoma

Interventions

Type	Name	Description
DRUG	Vactosertib	Vactosertib is given twice a day, five days on and two days off in four-week cycles. Vactosertib is a transforming growth factor-beta (TGF-β) type 1 receptor inhibitor.

Timeline

• Start date: 2023-05-01
• Primary completion: 2025-09-01
• Completion: 2025-12-01
• First posted: 2022-10-20
• Last updated: 2025-04-10

Locations

3 sites across 2 countries: United States, South Korea

Regulatory

• FDA-regulated drug study