NCT05302570

Neoadjuvant Short-course Hypofractionated PBT for Non-metastatic RPS

PROTONS-RPS: a Phase II Non-Randomized Open-label Single-arm Trial Of Neoadjuvant Short-course Hypofractionated Proton Beam Therapy for Non-metastatic RetroPeritoneal Sarcoma

• Status: Withdrawn
• Phase: Phase 2
• Study type: Interventional
• Enrollment: 0 (actual)
• Sponsor: Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Not accepted

Summary

The investigators' study titled "PROTONS-RPS: a Phase II non-Randomized Open-label single-arm Trial Of Neoadjuvant Short-course hypofractionated proton beam therapy for non-metastatic RetroPeritoneal Sarcoma" is a phase II trial evaluating the safety and efficacy of hypofractionated proton beam therapy (H-PBT) in the neoadjuvant (NA) setting for patients with non-metastatic retroperitoneal sarcoma (RPS) planned for surgical resection. This trial will include adult patients with resectable RPS.

Detailed description

The investigators' primary outcome is overall complication rate after treatment with NA H-PBT and surgical resection based on National Cancer Institute (NCI) Common Terminology Criteria for Adverse Events (CTCAE) version 5.0.2 Secondary objectives include evaluating the acute toxicity of H-PBT prior to surgical resection, rate of progression between diagnosis and definitive resection, early post-operative complication rate after resection of RPS in patients who received NA H-PBT, and local recurrence-free survival at 1 and 2 years. A priori subset analyses will be conducted for patients with well-differentiated and dedifferentiated liposarcoma. The investigators plan to accrue a minimum of 44 patients to evaluate the investigators' primary outcome. Treatment will be 5 doses of H-PBT including a simultaneous integrated boost to at-risk margins followed by surgical resection after 4-6 weeks. Patients will be followed in the post-operative setting according to standard of care surveillance for RPS.

Conditions

• Retroperitoneal Sarcoma

Interventions

Type	Name	Description
RADIATION	Hypofractionated Proton Beam Therapy	5 fractions of 5 Gy of PBT to clinical tumor volume +/- an additional simultaneous 1 Gy per fraction to any pre-determined at-risk margin (for a total of 6 Gy per fraction x 5 fractions for at-risk margins as a simultaneous integrated boost (SIB)).

Timeline

• Start date: 2022-12-01
• Primary completion: 2025-12-01
• Completion: 2027-12-01
• First posted: 2022-03-31
• Last updated: 2022-12-15

Locations

2 sites across 1 country: United States