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A Dose-escalation Trial of Stereotactic Ablative Body Radiotherapy for Non-spine Bone & Lymph Node Oligometastates

NCT03486431 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 90

Last updated 2024-02-08

No results posted yet for this study

Summary

Stereotactic ablative body radiotherapy (SABR) can be considered for patients with so-called "oligometastatic" disease. However, since this is a relatively new technique, information on the optimal scheduling is lacking. Even prospective randomized trials on SABR for oligometastases typically allow different fractionation schedules to be used. This is especially true for non-spine bone and lymph node metastases, where the literature is scarce to non-existent.

There is also emerging evidence that SABR can stimulate the immune response, by a variety of mechanisms such as increasing TLR4 expression on dendritic cells, increasing priming of T cells in draining lymph nodes, and increasing tumor cell antigen presentation by dendritic cells. Again, it is not clear which fractionation schedule elicits the most robust immune response.

Therefore, it is opportune to compare the most commonly used stereotactic regimens regarding toxicity, efficacy, and immune priming.

This trial is a non-randomized prospective phase I trial determining a regimen of choice for patients with non-spine bone and lymph node oligometastases (≤ 3 lesions). The metastatic lesion(s) must be visible on CT and \< 5 cm in largest diameter. A total of ninety patients will be consecutively included in three different fractionation regimens. They will be offered stereotactic ablative radiotherapy to all metastatic lesions in 5, 3 or 1 fractions. Dose-limiting toxicity (DLT), defined as any acute grade 3 or 4 toxicity, will be recorded as the primary endpoint. Overall acute and late toxicity, quality of life, local control, and progression-free survival are secondary endpoints.

Liquid biopsies will be collected throughout the course of this trial, i.e. at simulation, after each fraction and at 6 months after the end of the radiotherapy. Translational research will focus on assessment of circulating cytokines and flow cytometry analysis of immune cells.

Conditions

Interventions

RADIATION

Stereotactic Ablative Radiotherapy (SABR)

A minimum of thirty patients will be included for each dose level. An interval of at least 24 weeks from the first patient treatment to the next patient treatment at each dose level will be respected. In the meantime, more patients will be included in the previous dose level, in an effort to establish the secondary endpoints. In case 1-5 patients present with dose-limiting toxicity (DLT) at 6 months after SABR, thirty additional patients will be included at the same dose level. The maximal tolerated dose will be defined as the dose level below which at least 10 patients present with a dose-limiting toxicity at 6 months after SABR.

Sponsors & Collaborators

  • Cancer Research Antwerp

    lead OTHER

Principal Investigators

  • Piet Dirix, MD · Cancer Research Antwerp

Study Design

Allocation
NON_RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Model
SEQUENTIAL

Eligibility

Min Age
18 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2017-07-05
Primary Completion
2019-06-30
Completion
2019-12-31

Countries

  • Belgium

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 NCT03486431 on ClinicalTrials.gov