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Palliative Spatially Fractionated (GRID) Radiotherapy Using Intensity Modulated Proton Therapy

NCT05831579 · Status: RECRUITING · Phase: NA · Type: INTERVENTIONAL · Enrollment: 24

Last updated 2026-03-06

No results posted yet for this study

Summary

Spatially fractionated radiotherapy (SFRT or GRID) addresses some limitations of traditional stereotactic body radiation therapy by relying on beam collimation to create high-dose "peaks" and intervening low-dose "valleys" throughout the target volume. Standard palliative radiotherapy regimens provide limited durability of response, and there are challenges with delivery to large tumors or in previously irradiated fields. In this study, Proton GRID radiotherapy will be used to deliver three-fraction palliative radiotherapy to patients with tumors needing palliative radiation. The safety and efficacy of this approach will be assessed. It is hypothesized that GRID is highly effective, immunogenic, and associated with low rates of toxicity.

Conditions

Interventions

RADIATION

Proton GRID Radiotherapy

The proton GRID radiotherapy prescription dose is 20 Gy x 3 fractions to the tumor, with an integrated dose of 6 Gy x 3 fractions to the PTV. Treatment to multiple lesions within the PTV is allowed (ex. a dominant lesion plus satellites). Multiple proton GRID radiotherapy plans may be delivered on the same day or different days, but they cannot overlap.

Sponsors & Collaborators

  • Washington University School of Medicine

    lead OTHER

Principal Investigators

  • Anthony Apicelli, M.D. · Washington University School of Medicine

Study Design

Allocation
NON_RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Model
SEQUENTIAL

Eligibility

Min Age
18 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2023-05-12
Primary Completion
2027-06-30
Completion
2027-06-30
FDA Device
Yes

Countries

  • United States

Study Locations

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Entities

Diseases

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT05831579 on ClinicalTrials.gov