Spatially Fractionated Radiotherapy for Tumor Treatment

August 17, 2026 updated by: Xu Zhi-yuan

Spatially Fractionated Radiotherapy for Bulky or Refractory Solid Tumors: Efficacy and Toxicity

To explore the efficacy and toxicity of spatially fractionated radiotherapy in the treatment of tumors.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Detailed Description

Spatially fractionated radiotherapy (SFRT) is a next-generation technology for precision cancer treatment. It delivers a highly inhomogeneous dose distribution in three-dimensional space, demonstrating high clinical response rates and minimal toxicity in bulky primary or metastatic malignancies. Conventional radiotherapy, which uniformly irradiates the entire tumor volume, often causes radiation damage to normal tissues, thereby limiting clinical efficacy. In contrast, spatially fractionated radiotherapy divides the treatment volume into sub-volumes, alternating high-dose and low-dose regions among these sub-volumes. Lattice radiotherapy is an advanced technique that integrates the technological advantages of radiosurgery and grid radiotherapy, achieving both biological and physical precision, and represents a novel radiotherapy approach for managing bulky and refractory tumors.

Study Type

Interventional

Enrollment (Estimated)

126

Phase

  • Phase 2
  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

  • China
    • Guangdong
      • Shenzhen, Guangdong, China, 518053
        • Recruiting
        • The University of Hong Kong - Shenzhen Hospital
        • Contact:
        • Contact:
        • Principal Investigator:
          • Zhiyuan Xu, MD

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Patients with a bulky solid tumor with a maximum diameter >4 cm or a refractory solid tumor.

Exclusion Criteria:

  • Tumors involving hollow viscera that are considered to have a clinically significant risk of bleeding or perforation.
  • Patients with impaired consciousness or who are unable to care for themselves.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: SFRT arm
Adding spatially fractionated radiotherapy (SFRT) to standard-of-care treatment.
Radiation: spatially fractionated radiotherapy
spatially fractionated radiotherapy

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Number and percentage of participants with treatment-related grade ≥3 adverse events as assessed by CTCAE v5.0
Time Frame: From initiation of spatially fractionated radiation therapy through 90 days after completion of radiotherapy
Safety will be assessed by the incidence of treatment-related adverse events graded according to the National Cancer Institute Common Terminology Criteria for Adverse Events (CTCAE), version 5.0. The number and percentage of participants experiencing at least one treatment-related grade ≥3 adverse event during the specified assessment period will be reported. Treatment-related serious adverse events and grade 5 adverse events will also be summarized descriptively.Whether this study can be successfully executed and implemented.
From initiation of spatially fractionated radiation therapy through 90 days after completion of radiotherapy
Percentage of participants who successfully complete the planned spatially fractionated radiation therapy without treatment discontinuation due to treatment-related toxicity or technical inability to deliver the planned treatment
Time Frame: From initiation through completion of the planned spatially fractionated radiation therapy
Feasibility will be assessed by the proportion of enrolled participants who successfully complete the protocol-specified spatially fractionated radiation therapy (SFRT). Successful completion is defined as delivery of the planned SFRT according to the protocol without premature discontinuation due to treatment-related toxicity or technical inability to deliver the planned treatment. The number and percentage of participants meeting this definition will be reported.
From initiation through completion of the planned spatially fractionated radiation therapy

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Objective response rate (ORR) as assessed by RECIST version 1.1
Time Frame: From initiation of spatially fractionated radiation therapy until documented disease progression, initiation of subsequent anticancer therapy, death, or the end of follow-up, up to 2 years
Objective response rate (ORR) is defined as the percentage of participants who achieve a best overall response of complete response (CR) or partial response (PR) in the irradiated target lesion(s), as assessed according to Response Evaluation Criteria in Solid Tumors (RECIST), version 1.1. The number and percentage of participants achieving CR or PR will be reported.
From initiation of spatially fractionated radiation therapy until documented disease progression, initiation of subsequent anticancer therapy, death, or the end of follow-up, up to 2 years
Local progression-free survival (LPFS) as assessed by RECIST version 1.1
Time Frame: From initiation of spatially fractionated radiation therapy until local disease progression or death from any cause, up to 2 years
Local progression-free survival (LPFS) is defined as the time from initiation of spatially fractionated radiation therapy to the first documented local progression of the irradiated target lesion(s), as assessed according to RECIST version 1.1, or death from any cause, whichever occurs first. Participants who are alive without documented local progression at the time of analysis will be censored at the date of their last evaluable tumor assessment. LPFS will be estimated using the Kaplan-Meier method.
From initiation of spatially fractionated radiation therapy until local disease progression or death from any cause, up to 2 years

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Xu Zhi-yuan

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

December 19, 2024

Primary Completion (Estimated)

December 1, 2028

Study Completion (Estimated)

December 1, 2028

Study Registration Dates

First Submitted

July 11, 2026

First Submitted That Met QC Criteria

August 17, 2026

First Posted (Actual)

August 19, 2026

Study Record Updates

Last Update Posted (Actual)

August 19, 2026

Last Update Submitted That Met QC Criteria

August 17, 2026

Last Verified

August 1, 2026

More Information

Terms related to this study

Keywords

Other Study ID Numbers

  • hkuszhCAMT2024078

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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