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Active, not recruitingNCT03721341SABR-COMET 10Updated Sep 30, 2026

Stereotactic Ablative Radiotherapy for Comprehensive Treatment of 4-10 Oligometastatic Tumors

A Phase 3 interventional study of Palliative Radiation and Chemotherapy in Metastatic Tumors, sponsored by David Palma. Active, not recruiting at 14 sites in 5 countries. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-09-30.

Sponsored by David Palma · Phase 3, Interventional, and Treatment

Phase
Phase 3
Study type
Interventional
Enrollment
204
Allocation
Randomized
Ages
18 Years and older
Sex
All
01

Study summary

In patients with a limited oligometastatic burden (cancer has spread but is not yet considered metastatic), emerging evidence suggests that treatment of all sites of disease with ablative therapies can improve patient outcomes, including overall- and progression-free survival. The application of Stereotactic Ablative Radiotherapy (SABR) for patients with 4-10 metastatic deposits appears promising, yet it is unclear if all patients with greater than 3 oligometastatic lesions benefit from ablative therapies in terms of improved Overall Survival (OS), Progression Free Survival (PFS), or quality of life. The purpose of this study is to assess the impact of SABR, compared to standard of care treatment, on overall survival, oncologic outcomes, and quality of life in patients with a controlled primary tumor and 4-10 metastatic lesions.

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Conditions studied

  • Metastatic Tumors

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03

In context

Neoplasm Metastasis

3,517 studies on the registry are indexed under Neoplasm Metastasis; 885 are open to participants now.

This study's enrollment of 204 is above the median of 54 across 2,767 interventional studies indexed under Neoplasm Metastasis.

Browse Neoplasm Metastasis studies →

Lead sponsor

David Palma is the lead sponsor of 6 studies on the registry; 5 are open to participants now.

Counted across the registry records on this site, refreshed daily.

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Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

Inclusion criteria

  • Age 18 or older
  • Willing to provide informed consent
  • Karnofsky performance score greater than 60
  • Life expectancy greater than 6 months
  • Histologically confirmed malignancy with metastatic disease detected on imaging. Biopsy of metastasis is preferred, but not required.
  • Controlled primary tumor defined as: at least 3 months since original tumor treated definitively, with no progression at primary site
  • Total number of metastases 4-10
  • All sites of disease can be safely treated based on a pre-plan

Exclusion criteria

Exclusion Criteria:

  • Serious medical comorbidities precluding radiotherapy. These include interstitial lung disease in patients requiring thoracic radiation, Crohn's disease in patients where the GI tract will receive radiotherapy, and connective tissue disorders such as lupus or scleroderma.
  • For patients with liver metastases, moderate/severe liver dysfunction (Child Pugh B or C)
  • Substantial overlap with a previously treated radiation volume. Prior radiotherapy in general is allowed, as long as the composite plan meets dose constraints herein. For patients treated with radiation previously, biological effective dose calculations should be used to equate previous doses to the tolerance doses listed below. All such cases must be discussed with one of the study PIs.
  • Malignant pleural effusion
  • Inability to treat all sites of disease
  • Any single metastasis greater than 5 cm in size.
  • Any brain metastasis greater than 3 cm in size or a total volume of brain metastases greater than 30 cc.
  • Metastasis in the brainstem
  • Clinical or radiologic evidence of spinal cord compression
  • Dominant brain metastasis requiring surgical decompression
  • Metastatic disease that invades any of the following: GI tract (including esophagus, stomach, small or large bowel), mesenteric lymph nodes, or skin
  • Pregnant or lactating women
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Study design

Phase
Phase 3
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
None (open label)
Enrollment
204 participants (actual)

Study arms

  • Active comparator
    Standard arm

    Standard of care treatment: palliative radiotherapy, chemotherapy, immunotherapy, hormones, or observation, is at the discretion of the treating oncologist.

    Radiation: Palliative Radiation · Drug: Chemotherapy · Drug: Immunotherapy · Drug: Hormones · Other: Observation

  • Experimental
    Stereotactic Arm

    Stereotactic ablative radiotherapy, plus standard of care treatment: chemotherapy, immunotherapy, hormones, or observation given at the discretion of the treating oncologist.

    Drug: Chemotherapy · Drug: Immunotherapy · Drug: Hormones · Other: Observation · Radiation: Stereotactic Ablative Radiotherapy

Interventions

  • RadiationPalliative Radiation

    Investigators should follow the principles of palliative radiotherapy as per the individual institution in order to alleviate symptoms or prevent complications. If radiotherapy is indicated, recommended doses are 8 Gy in 1 fraction, 20 Gy in 5 fractions, and 30 Gy in 10 fractions.

    Also known as: Palliative Radiotherapy

  • DrugChemotherapy

    Chemotherapy may be given as indicated.

  • DrugImmunotherapy

    Immunotherapy may be given as indicated.

  • DrugHormones

    Hormones may be given as indicated.

  • OtherObservation

    Observation only is acceptable if this is the standard practice.

  • RadiationStereotactic Ablative Radiotherapy

    Total dose of radiation and number of fractions will depend on the site of disease. Doses are 20 Gy in 1 fraction, 30 Gy in 3 fractions (every 2 days), or 35 Gy in 5 fractions (daily).

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What researchers measure

Primary outcomes

  1. Overall Survival at Study Completion

    Time from randomization to death from any cause.

    Time frame: At approximately end of year 6 (study completion)

Secondary outcomes

  1. Progression-free Survival

    Time from randomization to disease progression at any site or death.

    Time frame: At approximately year 3, and end of year 6 (study completion)

  2. Time from randomization to development of new metastatic lesions

    New metastatic lesions will be detected using computed tomography, magnetic resonance imaging, and/or bone scans.

    Time frame: At approximately end of year 6 (study completion)

  3. Quality of Life as measured by the Functional Assessment of Cancer Therapy- General (FACT-G) questionnaire

    Time frame: At approximately end of year 6 (study completion)

  4. Quality of Life as measured by the EuroQOL Group EQ-5D-5L questionnaire

    Time frame: At approximately end of year 6 (study completion)

  5. Toxicity as measured by the Common Terminology Criteria for Adverse Events (CTCAE) version 4.0

    Time frame: End of years 1, 2, 3, 4, 5, and 6 (study completion)

  6. Overall Survival at midpoint of Study

    Time frame: At approximately year 3 (midpoint)

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Study locations

14 sites
  • Alfred Health
    Melbourne, Victoria 3181, Australia
  • BC Cancer Agency, Vancouver Island Centre
    Victoria, British Columbia V8R 4X1, Canada
  • Nova Scotia Health Authortiy
    Halifax, Nova Scotia B3S 0H6, Canada
  • Health Sciences North
    Greater Sudbury, Ontario P3E 5J1, Canada
  • Grand River Hospital
    Kitchener, Ontario N2G 1G3, Canada
  • London Regional Cancer Program of the Lawson Health Research Institute
    London, Ontario N6A 5W9, Canada
  • Trillium Health Partners-Credit Valley Hospital
    Mississauga, Ontario L5M 2N1, Canada
  • Niagra Health System
    St. Catharines, Ontario L2S 0A9, Canada
  • University Health Network
    Toronto, Ontario M5G 2C4, Canada
  • Centre hospitalier de l'Université de Montréal-CHUM
    Montreal, Quebec H2X 0C1, Canada
  • VU University Medical Centre
    Amsterdam, Netherlands
  • University Hospital of Zürich
    Zurich, 8091, Switzerland
  • Western General Hospital
    Edinburgh, EH4 2XU, United Kingdom
  • Beatson West of Scotland Cancer Centre
    Glasgow, G12 0YN, United Kingdom
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References and documents

Publications

  • Mattes MD, Eubank TD, Almubarak M, Wen S, Marano GD, Jacobson GM, Ma PC. A Prospective Trial Evaluating the Safety and Systemic Response From the Concurrent Use of Radiation Therapy with Checkpoint Inhibitor Immunotherapy in Metastatic Non-Small Cell Lung Cancer. Clin Lung Cancer. 2021 Jul;22(4):268-273. doi: 10.1016/j.cllc.2021.01.012. Epub 2021 Jan 25. PubMed 33608212 ↗
  • Palma DA, Olson R, Harrow S, Correa RJM, Schneiders F, Haasbeek CJA, Rodrigues GB, Lock M, Yaremko BP, Bauman GS, Ahmad B, Schellenberg D, Liu M, Gaede S, Laba J, Mulroy L, Senthi S, Louie AV, Swaminath A, Chalmers A, Warner A, Slotman BJ, de Gruijl TD, Allan A, Senan S. Stereotactic ablative radiotherapy for the comprehensive treatment of 4-10 oligometastatic tumors (SABR-COMET-10): study protocol for a randomized phase III trial. BMC Cancer. 2019 Aug 19;19(1):816. doi: 10.1186/s12885-019-5977-6. PubMed 31426760 ↗

Individual participant data

Plan to share: No

09

Updates

1 registry update since Sep 25, 2026
Minor edits
Nothing that changes what the study is or who can join. Edited: verification date and oversight details
1 update, last Sep 30, 2026
Show all 1 update
  1. Sep 30, 2026
    Minor edits only
    + 2 other changes: verification date and oversight details

From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗

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Registry details

Key details

Study ID
NCT03721341
Lead sponsor
David Palma
Collaborators
Academisch Medisch Centrum - Universiteit van Amsterdam (AMC-UvA), British Columbia Cancer - Centre for the North, Beatson West of Scotland Cancer Centre, London Health Sciences Centre
Responsible party
David Palma (Principal Investigator, London Health Sciences Centre Research Institute OR Lawson Research Institute of St. Joseph's) — Sponsor-investigator
First posted
Oct 26, 2018
Start date
Feb 22, 2019
Primary completion
Jan 2029 (estimated)
Completion
Jan 2029 (estimated)
Last update
Sep 30, 2026

Study contacts

David Palma, MD
principal investigator · London Health Sciences Centre, Lawson Health Research Institute
Suresh Senan, MRCP, FRCR
principal investigator · Academisch Medisch Centrum - Universiteit van Amsterdam (AMC-UvA)
Robert Olson, MD
principal investigator · British Columbia Cancer - Centre for the North
Stephen Harrow, MB ChB
principal investigator · Beatson West of Scotland Cancer Centre

Oversight

Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is active, not recruiting, as verified in Sep 2026. You cannot join it, but the record below documents what was studied.

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