Oligometastatic DiseaseNCT05784428
Single vs. Multiple Fraction Trial of Stereotactic Ablative Radiotherapy for Comprehensive Treatment of Oligometastases/Progression
A study testing Single fraction SABR, Multiple fraction SABR and QoL reporting alone in people with Oligometastatic Disease and Oligoprogression, run by Robert Olson at 14 sites in 2 countries.
Trial summary
Stereotactic Ablative Radiotherapy (SABR) is a modern RT technique that delivers high doses of radiation to small tumor targets using highly conformal techniques, while trying to avoid healthy tissues and organs. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Oligometastatic Disease, Oligoprogression, Toxicity Due to Radiotherapy
- What is being tested?
- Single fraction SABR, Multiple fraction SABR and QoL reporting alone
- Type of treatment
- Surgery or procedure
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 598 participants
- Where
- 14 sitesin 2 countries
- Study dates
- 16 Apr 2025to 30 May 2035
- Phase
- Interventional
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- 1-5 current oligometastatic or oligo-progressive lesions
- Age 18 years or older
- Able to provide informed consent
- Able to complete electronic entry of patient reported outcomes and questionnaires independently or with assistance from a caregiver/family/friend/research staff using electronic methods after providing consent to email use.
- Life expectancy > 6 months
- Histologically confirmed malignancy with metastatic disease detected on imaging. Biopsy of metastasis is preferred, but not required.
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- Eastern Cooperative Oncology Group (ECOG) performance status 0-2
- Controlled primary tumor: defined as at least 3 months since original tumor treated radically, with no progression at primary site (can be considered controlled if no evidence of the primary tumour on imaging [e.g. primary unknown])
- A history including ECOG performance status, performed within 6 weeks prior to enrollment
- Patient has had a CT chest, abdomen and pelvis or PET-CT within 10 weeks prior to enrollment, and within 13 weeks prior to treatment
- Patient has had a nuclear bone scan (if no positron emission tomography-computed tomography [PET-CT]) within 10 weeks prior to enrollment, and within 13 weeks prior to treatment
- Patient has had CT or MRI brain imaging if primary has a propensity for central nervous system metastases (if deemed appropriate by the treating investigator) within 10 weeks prior to enrollment, and within 13 weeks prior to treatment.
- For patients with known spine metastases, patient has had MRI spine imaging within 10 weeks prior to enrollment, and with 13 weeks prior to treatment.
- If solitary lung nodule for which biopsy is unsuccessful or not possible, patient has had an FDG (fluorodeoxyglucose) PET scan or CT (chest, abdomen, pelvis) and bone scan within 10 weeks prior to enrollment, and within 13 weeks prior to treatment
- If colorectal primary with rising Carcinoembryonic antigen (CEA), but equivocal imaging, patient has had an FDG PET scan within 10 weeks prior to enrollment, and within 13 weeks prior to treatment
- Patient is judged able to:
- Maintain a stable position during therapy
- Tolerate immobilization device(s) that may be required to deliver SABR safely
- Negative pregnancy test for People of Child-Bearing Potential (POCBP) within 4 weeks of RT start date
Who cannot join
- Uncontrolled concurrent malignant cancer
- Lesion in femoral bone requiring surgical fixation
- No chemotherapy agents (cytotoxic, or molecularly targeted agents) will be used within the period of time commencing 1 week prior to radiation, lasting until 1 week after the last fraction. See section 5.3.3 regarding this criterion.
- Serious medical comorbidities precluding radiotherapy. These include interstitial lung disease in patients requiring thoracic radiation, Crohn's disease in patients where the gastrointestinal (GI) tract will receive radiotherapy, and connective tissue disorders such as lupus or scleroderma.
- 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, similar biological effective dose calculations should be used to equate previous doses to the tolerance doses listed below. All such cases should be discussed with the local and study principal investigators (PIs).
- Current malignant pleural effusion
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- Liver metastases located in the "Biliary no fly zone" defined for this trial as common biliary track, cystic duct and distal branches (1 cm) + 5 mm.
- Inability to treat all sites of oligometastatic or oligoprogressive disease (all lesions must be suitable for both single- and multi-fraction SABR)
- Presence of brain metastases as the sole site of disease
- Maximum size of 5 cm for lesions outside the brain, except:
- Bone metastases over 5 cm may be included, if in the opinion of the local PI it can be treated safely (e.g. rib, scapula, pelvis)
- Any brain metastasis > 3.5 cm in size or a total volume of brain metastases greater than 30 cc is excluded
- Clinical or radiologic evidence of spinal cord compression. Patients can be eligible if surgical resection has been performed
- Patients with spine instability as judged by a Spinal Instability Neoplastic Score (SINS) of >12
- Dominant brain metastasis requiring surgical decompression
- Surgical resection of all metastases (i.e. no lesion available to be treated with SABR)
- Complete response to systemic therapy, defined as the absence of visible disease on imaging
- Pregnant or breast feeding
Trial locations and contacts
14 sites in 2 countries. Contact the study team or a site near you to ask about taking part.
14 sites in 2 countries
Canada7 sites, 7 recruiting
- Recruiting
Health Sciences North Research Institute
Greater Sudbury, Ontario, P3E 5J1
Jessica Richer, 705.522.6237 ext. 1922, jricher@hsnri.ca
Andrew Pearce
- Recruiting
BC Cancer
Kelowna, British Columbia
Benjamin Mou, MD, 250-712-3900, benjamin.mou@bccancer.bc.ca
- Recruiting
BC Cancer
Prince George, British Columbia, V2M 7E9
Robert A Olson, MD, 2506457300, rolson2@bccancer.bc.ca
Hadassah Abraham, 2506457300, hadassah.abraham@bccancer.bc.ca
- Recruiting
BC Cancer
Surrey, British Columbia
Devin Schellenberg, MD, 604-930-2098, dschellenberg@bccancer.bc.ca
- Recruiting
Princess Margaret Cancer Centre | University Health Network
Toronto, Ontario, M5G 1X6
Yoona Shin, 416-946-4558, yoona.shin@uhn.ca
Chiaojung Jillian Tsai
- Recruiting
BC Cancer
Vancouver, British Columbia
Mitchell Liu, MD, 6048776000, mliu@bccancer.bc.ca
- Not yet recruiting
BC Cancer - Victoria
Victoria, British Columbia
Boris Valev, MD, 250-519-5500, boris.valev@bccancer.bc.ca
Ireland7 sites, 7 recruiting
- Recruiting
Cork University Hospital
Cork, Munster, T12 DC4A
Murtaza Gangardiwala, 021 4234807, murtaza.gangardiwala@hse.ie
Aisling Barry
- Recruiting
Bon Secours Radiotherapy Cork in Partnership with UPMC Hillman Cancer Centre
Cork, Munster, T12 DV56
Erica Bennett, +353 21-486-11, bennette10@upmc.ie
Paul Kelly
- Recruiting
St. Luke's Radiation Oncology Network
Dublin, Dublin, D06 E1C9
Roisin O'Maolalai, 0035314065458, roisin.omaolalai@slh.ie
Lorna Keenan
- Recruiting
Mater Private Hospital
Dublin, Leinster, D07 WKW8
Lisa Scahill, +353 (1) 8034831, lscahill@mater.ie
Daniel Cagney
- Recruiting
Beacon Hospital
Dublin, Leinster, D18 AK68
Roisin Conaty, 353 1 293 6600, roisin.conaty@beaconhospital.ie
Alina Mihai
- Recruiting
University Hospital Galway
Galway, Connacht, H91 YR71
Helen McLoughlin, 091 542600, Helen.McLoughlin6@hse.ie
Ronan McDermott
- Recruiting
UPMC Whitfield Hospital - Waterford
Waterford, Munster, X91 DH9W
Erica Bennett, bennette10@upmc.ie
Ciara Lyons
About this study
Official title: Single vs. Multiple Fraction Non-Inferiority Trial of Stereotactic Ablative Radiotherapy for the Comprehensive Treatment of Oligo-metastases/Progression: SIMPLIFY-SABR-COMET
Stereotactic Ablative Radiotherapy (SABR) is a modern RT technique that delivers high doses of radiation to small tumor targets using highly conformal techniques, while trying to avoid healthy tissues and organs. However, SABR treatment requires increased planning, treatment time, cost and potential for higher toxicity due to the higher dose. The purpose of this study is to compare single fraction (SF) SABR vs. multiple fraction (MF) SABR in regards to toxicities, progression-free survival, quality of life (QoL), and cost-effectiveness. In a subset of patients, we will also compare patient QoL, hospitalization rates, and cost-effectiveness between patients who complete QoL questionnaires, record symptoms and receive healthcare provider-guided intervention vs. patients who complete QoL questionnaires only.
Read the detailed description
Radiation can be delivered in multiple fractions, or doses, and can take up to several weeks or months of treatment depending on the type of cancer. Radiation can also be offered in a single fraction. Both techniques have evidence for use in clinical care. Multiple fraction is offered to reduce the amount of radiation given at a single time that could reduce late toxicities. However, single fraction radiotherapy is more cost-effective and saves patient time. With this trial, we will compare single fraction vs. multiple fraction in regards to their impact on toxicity, progression-free survival: time from randomization to disease progression at any site or death, lesional control rate: lesion size post-SABR, quality of life and cost-effectiveness.
In a subset of sites, we will also investigate the impact of healthcare-provider guided intervention on quality of life. Questionnaires capture various symptoms such as pain, fatigue and information relating to physical, social, and mental wellbeing. This information can help shed light on patient experience and provide a better understanding of the effects of radiation therapy. In this trial, we will compare quality of life questionnaire completion, symptom reporting and healthcare-provider guided intervention vs. quality of life questionnaire completion alone, in regards to patient quality of life. Hospitalization rates and frequency of emergency department visits will also be investigated.
Sample size: The total sample size of 598 for this trial was calculated based on the primary endpoint of toxicity for the single vs. multiple fraction SABR randomization. Calculations were performed based on the results of the SABR-5 trial and our clinical judgement.
Quality Assurance: Radiation treatments are based on the current phase III SABR-COMET-3 trial and as per recent clinical evidence. All treatments will be planned as per protocol including computed tomography (CT) simulation, organs at risk contouring and undergo a quality assurance process.
For the subset of sites involved in the second randomization, training will be provided to patients on the use of Noona, a patient-reported outcome platform.
- Being tested
- Single fraction SABR, Multiple fraction SABR, QoL reporting alone, QoL reporting, symptom screen and healthcare provider intervention
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Single fraction SABRRadiation
Participants randomized to this arm will receive SF SABR
Treatment recommendations are as follows:
Lung: Greater than 2 cm from mediastinum or brachial plexus or if mandatory OAR constraints are met: 30 Gy in 1 fraction
Lung: Within 2 cm of mediastinum or brachial plexus 20 Gy in 1 fraction
Bone, Spine, Adrenal, lymph node/soft tissue: 20 Gy in 1 fraction
Liver: 30 Gy in 1 fraction
Brain: dose as per institutional policy
Multiple fraction SABRRadiation
Participants randomized to this arm will receive MF SABR:
Dose/Fractionation are as follows:
Lung: Greater than 2 cm from mediastinum or brachial plexus or if mandatory organ-at-risk (OAR) constraints are met: 48 Gy in 4 fractions (12 Gy/#), 54 Gy in 3 fractions (18 Gy/#), daily or every second day
Lung: Within 2 cm of mediastinum or brachial plexus 60 Gy in 8 fractions (7.5 Gy/#), 50 Gy in 5 fractions (10 Gy/#), daily
Bone: Any bone except spine: 35 Gy in 5 fractions (7 Gy/#), daily
Liver: 54 Gy in 3 fractions (18 Gy/#) or 5 fractions (10.8 Gy/#), daily or every second day
Spine: 24 Gy in 2 fractions (12 Gy/#) or 35 Gy in 5 fractions (7 Gy/#), daily
Adrenal: 40 Gy in 5 fractions (8 Gy/#) or 35 Gy in 5 fractions (7 Gy/#), daily
Lymph node/soft tissue: 40 Gy in 5 fractions (8 Gy/#) or 35 Gy in 5 fractions (7 Gy/#), daily
Brain - dose per institutional policy for stereotactic lesions (no whole brain RT).
QoL reporting aloneOther
Participants randomized to this arm will complete the EQ-5D-5L and FACT-G at baseline and each follow-up visit
QoL reporting, symptom screen and healthcare provider interventionOther
Participants randomized to this arm will complete the FACT,G, EQ-5D-5L, radiation-symptom screen and receive healthcare provider-guided intervention based on their symptom reports.
| Study group | Role | What they receive |
|---|---|---|
| Multiple fraction SABR (Arm 1) | Active comparator | Participants randomized to this arm will receive multiple fraction SABR Receives: Radiation: Multiple fraction SABR |
| Single fraction SABR (Arm 2) | Experimental | Participants randomized to this arm will receive single fraction SABR Receives: Radiation: Single fraction SABR |
| Patient-reported outcome (PRO) collection : QoL reporting alone (Arm A) | Active comparator | Participants will complete the EuroQoL-5Dimensions-5levels (EQ-5D-5L) and Functional Assessment of Cancer Therapy-General (FACT-G) prior to each scheduled follow-up (FU). Receives: Other: QoL reporting alone |
| QoL reporting and healthcare provider (HCP) intervention guided by symptom screen (Arm B) | Experimental | * Patients complete EQ-5D-5L and FACT-G prior to each scheduled FU
* Patient complete online adaptive symptom screen with HCP intervention, prior to each scheduled appointment Receives: Other: QoL reporting, symptom screen and healthcare provider intervention |
What is being measured
The primary outcome is the main question the study is designed to answer.
Adverse events
Occurrences and changes in grade 3 or higher adverse events related to treatment, according to CTCAE v5.0
Measured: At 6 weeks, 3 months, 6 months, 12 months, 18 months, 24 months, 36 months, 48 months, 60 months
Change in patient-reported quality of life
As measured by the EQ-5D-5L. This questionnaire provides measures for mobility, self-care, usual activities, pain/discomfort, and anxiety/depression. It also includes a numbered scale from 0 to 100 where 100 means the best health one can imagine, and 0 means the worst health one can imagine.
Measured: At 6 weeks, 3 months, 6 months, 12 months, 18 months, 24 months, 36 months, 48 months, 60 months
Secondary outcomes (4)
Lesional control rate
Rate is determined based on lesion size post-SABR using Response Evaluation Criteria in Solid Tumors (RECIST) 1.1
Measured: At 6 weeks, 3 months, 6 months, 12 months, 18 months, 24 months, 36 months, 48 months, 60 months
Progression-free survival
Time from randomization to disease progression at any site or death
Measured: At 6 weeks, 3 months, 6 months, 12 months, 18 months, 24 months, 36 months, 48 months, 60 months
Overall survival
Time from randomization to death from any cause (exploratory)
Measured: Approximately at the end of year 5 of follow-up, at study completion
Resource utilization
Assessed via patient- and provider-reported hospitalization rates, frequency of emergency department visits, number of patients with systemic or radiation therapy post SABR treatment on trial
Measured: At 3 months, 6 months, 12 months, 18 months, 24 months, 36 months, 48 months, 60 months
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted24 Mar 2023
- Study start16 Apr 2025
- Primary completion30 Apr 2035 (estimated)
- Study completion30 May 2035 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (13)Papers the sponsor has linked to this study.
- Other trials for Oligometastatic DiseaseStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Factorial
- Model description
- This study is a phase III multicentre randomized trial. All participants will be randomized in a 1:1 ratio between multiple fraction SABR (Arm 1) vs. single fraction SABR (Arm 2). Patients will be stratified by systemic therapy within the last 2 weeks (yes/no); number of sites to be treated (1 vs. multiple) and SABR to the abdominal/pelvic site (yes/no). BC Cancer sites will also participate in the second randomization. Participants will be randomized in a 1:1 ratio to QoL reporting alone via FACT-G and EQ-5D-5L (Arm A) vs. QoL reporting and patient-reported outcome (PRO) symptom screen with healthcare provider intervention (Arm B). Patients will be further stratified by the criteria for the 1st randomization as as well as sex.
- Masking
- None (open label)
- Enrolment
- 598 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Robert Olson
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor-investigator, Robert Olson, British Columbia Cancer Agency
- Investigators
- Robert Olson, MD, MSc, FRCPC, Principal investigator, BC Cancer - Prince George
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05784428
- Sponsor's protocol ID
- SIMPLIFY-SABR-COMET
- Status last verified
- Sep 2026
- First submitted
- 28 Feb 2023
- Last updated
- 24 Sep 2026
- Results posted
- No
- Data monitoring committee
- Yes
- FDA-regulated drug
- No
- FDA-regulated device
- No
Publications
Hellman S, Weichselbaum RR. Oligometastases. J Clin Oncol. 1995 Jan;13(1):8-10. doi: 10.1200/JCO.1995.13.1.8. No abstract available.
PubMed 7799047Patel PH, Palma D, McDonald F, Tree AC. The Dandelion Dilemma Revisited for Oligoprogression: Treat the Whole Lawn or Weed Selectively? Clin Oncol (R Coll Radiol). 2019 Dec;31(12):824-833. doi: 10.1016/j.clon.2019.05.015. Epub 2019 Jun 8.
PubMed 31182289Nguyen TK, Chin L, Sahgal A, Dagan R, Eppinga W, Guckenberger M, Kim JH, Lo SS, Redmond KJ, Siva S, Stish BJ, Chan R, Lawrence L, Lau A, Tseng CL. International Multi-institutional Patterns of Contouring Practice and Clinical Target Volume Recommendations for Stereotactic Body Radiation Therapy for Non-Spine Bone Metastases. Int J Radiat Oncol Biol Phys. 2022 Feb 1;112(2):351-360. doi: 10.1016/j.ijrobp.2021.09.004. Epub 2021 Sep 9.
PubMed 34509549Cox BW, Spratt DE, Lovelock M, Bilsky MH, Lis E, Ryu S, Sheehan J, Gerszten PC, Chang E, Gibbs I, Soltys S, Sahgal A, Deasy J, Flickinger J, Quader M, Mindea S, Yamada Y. International Spine Radiosurgery Consortium consensus guidelines for target volume definition in spinal stereotactic radiosurgery. Int J Radiat Oncol Biol Phys. 2012 Aug 1;83(5):e597-605. doi: 10.1016/j.ijrobp.2012.03.009. Epub 2012 May 19.
PubMed 22608954Redmond KJ, Robertson S, Lo SS, Soltys SG, Ryu S, McNutt T, Chao ST, Yamada Y, Ghia A, Chang EL, Sheehan J, Sahgal A. Consensus Contouring Guidelines for Postoperative Stereotactic Body Radiation Therapy for Metastatic Solid Tumor Malignancies to the Spine. Int J Radiat Oncol Biol Phys. 2017 Jan 1;97(1):64-74. doi: 10.1016/j.ijrobp.2016.09.014. Epub 2016 Sep 17.
PubMed 27843035Dunne EM, Sahgal A, Lo SS, Bergman A, Kosztyla R, Dea N, Chang EL, Chang UK, Chao ST, Faruqi S, Ghia AJ, Redmond KJ, Soltys SG, Liu MC. International consensus recommendations for target volume delineation specific to sacral metastases and spinal stereotactic body radiation therapy (SBRT). Radiother Oncol. 2020 Apr;145:21-29. doi: 10.1016/j.radonc.2019.11.026. Epub 2019 Dec 23.
PubMed 31874346Herdman M, Gudex C, Lloyd A, Janssen M, Kind P, Parkin D, Bonsel G, Badia X. Development and preliminary testing of the new five-level version of EQ-5D (EQ-5D-5L). Qual Life Res. 2011 Dec;20(10):1727-36. doi: 10.1007/s11136-011-9903-x. Epub 2011 Apr 9.
PubMed 21479777Common Terminology Criteria for Adverse Events (CTCAE) Common Terminology Criteria for Adverse Events (CTCAE) v5.0. 2017
Cella DF, Tulsky DS, Gray G, Sarafian B, Linn E, Bonomi A, Silberman M, Yellen SB, Winicour P, Brannon J, et al. The Functional Assessment of Cancer Therapy scale: development and validation of the general measure. J Clin Oncol. 1993 Mar;11(3):570-9. doi: 10.1200/JCO.1993.11.3.570.
PubMed 8445433Basch E, Reeve BB, Mitchell SA, Clauser SB, Minasian LM, Dueck AC, Mendoza TR, Hay J, Atkinson TM, Abernethy AP, Bruner DW, Cleeland CS, Sloan JA, Chilukuri R, Baumgartner P, Denicoff A, St Germain D, O'Mara AM, Chen A, Kelaghan J, Bennett AV, Sit L, Rogak L, Barz A, Paul DB, Schrag D. Development of the National Cancer Institute's patient-reported outcomes version of the common terminology criteria for adverse events (PRO-CTCAE). J Natl Cancer Inst. 2014 Sep 29;106(9):dju244. doi: 10.1093/jnci/dju244. Print 2014 Sep.
PubMed 25265940Basch E, Deal AM, Kris MG, Scher HI, Hudis CA, Sabbatini P, Rogak L, Bennett AV, Dueck AC, Atkinson TM, Chou JF, Dulko D, Sit L, Barz A, Novotny P, Fruscione M, Sloan JA, Schrag D. Symptom Monitoring With Patient-Reported Outcomes During Routine Cancer Treatment: A Randomized Controlled Trial. J Clin Oncol. 2016 Feb 20;34(6):557-65. doi: 10.1200/JCO.2015.63.0830. Epub 2015 Dec 7.
PubMed 26644527Olson R, Mathews L, Liu M, Schellenberg D, Mou B, Berrang T, Harrow S, Correa RJM, Bhat V, Pai H, Mohamed I, Miller S, Schneiders F, Laba J, Wilke D, Senthi S, Louie AV, Swaminath A, Chalmers A, Gaede S, Warner A, de Gruijl TD, Allan A, Palma DA. Stereotactic ablative radiotherapy for the comprehensive treatment of 1-3 Oligometastatic tumors (SABR-COMET-3): study protocol for a randomized phase III trial. BMC Cancer. 2020 May 5;20(1):380. doi: 10.1186/s12885-020-06876-4.
PubMed 32370765Olson R, Abraham H, Leclerc C, Benny A, Baker S, Matthews Q, Chng N, Bergman A, Mou B, Dunne EM, Schellenberg D, Jiang W, Chan E, Atrchian S, Lefresne S, Carolan H, Valev B, Tyldesley S, Bang A, Berrang T, Clark H, Hsu F, Louie AV, Warner A, Palma DA, Howell D, Barry A, Dawson L, Grendarova P, Walker D, Sinha R, Tsai J, Bahig H, Thibault I, Koul R, Senthi S, Phillips I, Grose D, Kelly P, Armstrong J, McDermott R, Johnstone C, Vasan S, Aherne N, Harrow S, Liu M. Single vs. multiple fraction non-inferiority trial of stereotactic ablative radiotherapy for the comprehensive treatment of oligo-metastases/progression: SIMPLIFY-SABR-COMET. BMC Cancer. 2024 Feb 3;24(1):171. doi: 10.1186/s12885-024-11905-7.
PubMed 38310262
Study at a glance
From the registry record, last updated by the sponsor on 24 Sep 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Single vs. Multiple Fraction Non-Inferiority Trial of Stereotactic Ablative Radiotherapy for the Comprehensive Treatment of Oligo-metastases/Progression: SIMPLIFY-SABR-COMET
- ClinicalTrials.gov ID
- NCT05784428
- Acronym / sponsor ID
- SIMPLIFY-SABR-COMET
- Study type
- Interventional
- Recruitment status
- Recruiting
- Enrolment
- 598 participants (estimated)
- Lead sponsor
- Robert OlsonUniversity, hospital or other
- Study start
- 16 Apr 2025 (actual)
- Primary completion
- 30 Apr 2035 (estimated)
- Study completion
- 30 May 2035 (estimated)
- First posted
- 24 Mar 2023 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Stereotactic Ablative Radiotherapy (SABR) is a modern RT technique that delivers high doses of radiation to small tumor targets using highly conformal techniques, while trying to avoid healthy tissues and organs. However, SABR treatment requires increased planning, treatment time, cost and potential for higher toxicity due to the higher dose. The purpose of this study is to compare single fraction (SF) SABR vs. multiple fraction (MF) SABR in regards to toxicities, progression-free survival, quality of life (QoL), and cost-effectiveness. In a subset of patients, we will also compare patient QoL, hospitalization rates, and cost-effectiveness between patients who complete QoL questionnaires, record symptoms and receive healthcare provider-guided intervention vs. patients who complete QoL questionnaires only.
Detailed description
Radiation can be delivered in multiple fractions, or doses, and can take up to several weeks or months of treatment depending on the type of cancer. Radiation can also be offered in a single fraction. Both techniques have evidence for use in clinical care. Multiple fraction is offered to reduce the amount of radiation given at a single time that could reduce late toxicities. However, single fraction radiotherapy is more cost-effective and saves patient time. With this trial, we will compare single fraction vs. multiple fraction in regards to their impact on toxicity, progression-free survival: time from randomization to disease progression at any site or death, lesional control rate: lesion size post-SABR, quality of life and cost-effectiveness.
In a subset of sites, we will also investigate the impact of healthcare-provider guided intervention on quality of life. Questionnaires capture various symptoms such as pain, fatigue and information relating to physical, social, and mental wellbeing. This information can help shed light on patient experience and provide a better understanding of the effects of radiation therapy. In this trial, we will compare quality of life questionnaire completion, symptom reporting and healthcare-provider guided intervention vs. quality of life questionnaire completion alone, in regards to patient quality of life. Hospitalization rates and frequency of emergency department visits will also be investigated.
Sample size: The total sample size of 598 for this trial was calculated based on the primary endpoint of toxicity for the single vs. multiple fraction SABR randomization. Calculations were performed based on the results of the SABR-5 trial and our clinical judgement.
Quality Assurance: Radiation treatments are based on the current phase III SABR-COMET-3 trial and as per recent clinical evidence. All treatments will be planned as per protocol including computed tomography (CT) simulation, organs at risk contouring and undergo a quality assurance process.
For the subset of sites involved in the second randomization, training will be provided to patients on the use of Noona, a patient-reported outcome platform.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Factorial
- Masking
- None (open label)
- Number of arms
- 4
- Model description
- This study is a phase III multicentre randomized trial. All participants will be randomized in a 1:1 ratio between multiple fraction SABR (Arm 1) vs. single fraction SABR (Arm 2). Patients will be stratified by systemic therapy within the last 2 weeks (yes/no); number of sites to be treated (1 vs. multiple) and SABR to the abdominal/pelvic site (yes/no). BC Cancer sites will also participate in the second randomization. Participants will be randomized in a 1:1 ratio to QoL reporting alone via FACT-G and EQ-5D-5L (Arm A) vs. QoL reporting and patient-reported outcome (PRO) symptom screen with healthcare provider intervention (Arm B). Patients will be further stratified by the criteria for the 1st randomization as as well as sex.
| Arm | Type | Receives |
|---|---|---|
| Multiple fraction SABR (Arm 1) | Active comparator | Radiation: Multiple fraction SABRParticipants randomized to this arm will receive multiple fraction SABR |
| Single fraction SABR (Arm 2) | Experimental | Radiation: Single fraction SABRParticipants randomized to this arm will receive single fraction SABR |
| Patient-reported outcome (PRO) collection : QoL reporting alone (Arm A) | Active comparator | Other: QoL reporting aloneParticipants will complete the EuroQoL-5Dimensions-5levels (EQ-5D-5L) and Functional Assessment of Cancer Therapy-General (FACT-G) prior to each scheduled follow-up (FU). |
| QoL reporting and healthcare provider (HCP) intervention guided by symptom screen (Arm B) | Experimental | Other: QoL reporting, symptom screen and healthcare provider intervention* Patients complete EQ-5D-5L and FACT-G prior to each scheduled FU * Patient complete online adaptive symptom screen with HCP intervention, prior to each scheduled appointment |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (19 listed)
- 1-5 current oligometastatic or oligo-progressive lesions
- Age 18 years or older
- Able to provide informed consent
- Able to complete electronic entry of patient reported outcomes and questionnaires independently or with assistance from a caregiver/family/friend/research staff using electronic methods after providing consent to email use.
- Life expectancy > 6 months
Key exclusion criteria (18 listed)
- Uncontrolled concurrent malignant cancer
- Lesion in femoral bone requiring surgical fixation
- No chemotherapy agents (cytotoxic, or molecularly targeted agents) will be used within the period of time commencing 1 week prior to radiation, lasting until 1 week after the last fraction. See section 5.3.3 regarding this criterion.
- Serious medical comorbidities precluding radiotherapy. These include interstitial lung disease in patients requiring thoracic radiation, Crohn's disease in patients where the gastrointestinal (GI) tract will receive radiotherapy, and connective tissue disorders such as lupus or scleroderma.
- 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, similar biological effective dose calculations should be used to equate previous doses to the tolerance doses listed below. All such cases should be discussed with the local and study principal investigators (PIs).
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Single fraction SABRParticipants randomized to this arm will receive SF SABR Treatment recommendations are as follows: Lung: Greater than 2 cm from mediastinum or brachial plexus or if mandatory OAR constraints are met: 30 Gy in 1 fraction Lung: Within 2 cm of mediastinum or brachial plexus 20 Gy in 1 fraction Bone, Spine, Adrenal, lymph node/soft tissue: 20 Gy in 1 fraction Liver: 30 Gy in 1 fraction Brain: dose as per institutional policy | Radiation | Single fraction SABR (Arm 2) |
| Multiple fraction SABRParticipants randomized to this arm will receive MF SABR: Dose/Fractionation are as follows: Lung: Greater than 2 cm from mediastinum or brachial plexus or if mandatory organ-at-risk (OAR) constraints are met: 48 Gy in 4 fractions (12 Gy/#), 54 Gy in 3 fractions (18 Gy/#), daily or every second day Lung: Within 2 cm of mediastinum or brachial plexus 60 Gy in 8 fractions (7.5 Gy/#), 50 Gy in 5 fractions (10 Gy/#), daily Bone: Any bone except spine: 35 Gy in 5 fractions (7 Gy/#), daily Liver: 54 Gy in 3 fractions (18 Gy/#) or 5 fractions (10.8 Gy/#), daily or every second day Spine: 24 Gy in 2 fractions (12 Gy/#) or 35 Gy in 5 fractions (7 Gy/#), daily Adrenal: 40 Gy in 5 fractions (8 Gy/#) or 35 Gy in 5 fractions (7 Gy/#), daily Lymph node/soft tissue: 40 Gy in 5 fractions (8 Gy/#) or 35 Gy in 5 fractions (7 Gy/#), daily Brain - dose per institutional policy for stereotactic lesions (no whole brain RT). | Radiation | Multiple fraction SABR (Arm 1) |
| QoL reporting aloneParticipants randomized to this arm will complete the EQ-5D-5L and FACT-G at baseline and each follow-up visit | Other | Patient-reported outcome (PRO) collection : QoL reporting alone (Arm A) |
| QoL reporting, symptom screen and healthcare provider interventionParticipants randomized to this arm will complete the FACT,G, EQ-5D-5L, radiation-symptom screen and receive healthcare provider-guided intervention based on their symptom reports. | Other | QoL reporting and healthcare provider (HCP) intervention guided by symptom screen (Arm B) |
Primary outcome
Adverse events
Time frame: At 6 weeks, 3 months, 6 months, 12 months, 18 months, 24 months, 36 months, 48 months, 60 months
Occurrences and changes in grade 3 or higher adverse events related to treatment, according to CTCAE v5.0
Change in patient-reported quality of life
Time frame: At 6 weeks, 3 months, 6 months, 12 months, 18 months, 24 months, 36 months, 48 months, 60 months
As measured by the EQ-5D-5L. This questionnaire provides measures for mobility, self-care, usual activities, pain/discomfort, and anxiety/depression. It also includes a numbered scale from 0 to 100 where 100 means the best health one can imagine, and 0 means the worst health one can imagine.
4 secondary outcomes
Lesional control rate
Time frame: At 6 weeks, 3 months, 6 months, 12 months, 18 months, 24 months, 36 months, 48 months, 60 months
Progression-free survival
Time frame: At 6 weeks, 3 months, 6 months, 12 months, 18 months, 24 months, 36 months, 48 months, 60 months
Overall survival
Time frame: Approximately at the end of year 5 of follow-up, at study completion
Resource utilization
Time frame: At 3 months, 6 months, 12 months, 18 months, 24 months, 36 months, 48 months, 60 months
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 24 Sep 2026.
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- Background: PubMed 31182289Patel PH, Palma D, McDonald F, Tree AC. The Dandelion Dilemma Revisited for Oligoprogression: Treat the Whole Lawn or Weed Selectively? Clin Oncol (R Coll Radiol). 2019 Dec;31(12):824-833. doi: 10.1016/j.clon.2019.05.015. Epub 2019 Jun 8.
- Background: PubMed 34509549Nguyen TK, Chin L, Sahgal A, Dagan R, Eppinga W, Guckenberger M, Kim JH, Lo SS, Redmond KJ, Siva S, Stish BJ, Chan R, Lawrence L, Lau A, Tseng CL. International Multi-institutional Patterns of Contouring Practice and Clinical Target Volume Recommendations for Stereotactic Body Radiation Therapy for Non-Spine Bone Metastases. Int J Radiat Oncol Biol Phys. 2022 Feb 1;112(2):351-360. doi: 10.1016/j.ijrobp.2021.09.004. Epub 2021 Sep 9.
- Background: PubMed 22608954Cox BW, Spratt DE, Lovelock M, Bilsky MH, Lis E, Ryu S, Sheehan J, Gerszten PC, Chang E, Gibbs I, Soltys S, Sahgal A, Deasy J, Flickinger J, Quader M, Mindea S, Yamada Y. International Spine Radiosurgery Consortium consensus guidelines for target volume definition in spinal stereotactic radiosurgery. Int J Radiat Oncol Biol Phys. 2012 Aug 1;83(5):e597-605. doi: 10.1016/j.ijrobp.2012.03.009. Epub 2012 May 19.
- Background: PubMed 27843035Redmond KJ, Robertson S, Lo SS, Soltys SG, Ryu S, McNutt T, Chao ST, Yamada Y, Ghia A, Chang EL, Sheehan J, Sahgal A. Consensus Contouring Guidelines for Postoperative Stereotactic Body Radiation Therapy for Metastatic Solid Tumor Malignancies to the Spine. Int J Radiat Oncol Biol Phys. 2017 Jan 1;97(1):64-74. doi: 10.1016/j.ijrobp.2016.09.014. Epub 2016 Sep 17.
- Background: PubMed 31874346Dunne EM, Sahgal A, Lo SS, Bergman A, Kosztyla R, Dea N, Chang EL, Chang UK, Chao ST, Faruqi S, Ghia AJ, Redmond KJ, Soltys SG, Liu MC. International consensus recommendations for target volume delineation specific to sacral metastases and spinal stereotactic body radiation therapy (SBRT). Radiother Oncol. 2020 Apr;145:21-29. doi: 10.1016/j.radonc.2019.11.026. Epub 2019 Dec 23.
- Background: PubMed 21479777Herdman M, Gudex C, Lloyd A, Janssen M, Kind P, Parkin D, Bonsel G, Badia X. Development and preliminary testing of the new five-level version of EQ-5D (EQ-5D-5L). Qual Life Res. 2011 Dec;20(10):1727-36. doi: 10.1007/s11136-011-9903-x. Epub 2011 Apr 9.
- BackgroundCommon Terminology Criteria for Adverse Events (CTCAE) Common Terminology Criteria for Adverse Events (CTCAE) v5.0. 2017
- Background: PubMed 8445433Cella DF, Tulsky DS, Gray G, Sarafian B, Linn E, Bonomi A, Silberman M, Yellen SB, Winicour P, Brannon J, et al. The Functional Assessment of Cancer Therapy scale: development and validation of the general measure. J Clin Oncol. 1993 Mar;11(3):570-9. doi: 10.1200/JCO.1993.11.3.570.
- Background: PubMed 25265940Basch E, Reeve BB, Mitchell SA, Clauser SB, Minasian LM, Dueck AC, Mendoza TR, Hay J, Atkinson TM, Abernethy AP, Bruner DW, Cleeland CS, Sloan JA, Chilukuri R, Baumgartner P, Denicoff A, St Germain D, O'Mara AM, Chen A, Kelaghan J, Bennett AV, Sit L, Rogak L, Barz A, Paul DB, Schrag D. Development of the National Cancer Institute's patient-reported outcomes version of the common terminology criteria for adverse events (PRO-CTCAE). J Natl Cancer Inst. 2014 Sep 29;106(9):dju244. doi: 10.1093/jnci/dju244. Print 2014 Sep.
- Background: PubMed 26644527Basch E, Deal AM, Kris MG, Scher HI, Hudis CA, Sabbatini P, Rogak L, Bennett AV, Dueck AC, Atkinson TM, Chou JF, Dulko D, Sit L, Barz A, Novotny P, Fruscione M, Sloan JA, Schrag D. Symptom Monitoring With Patient-Reported Outcomes During Routine Cancer Treatment: A Randomized Controlled Trial. J Clin Oncol. 2016 Feb 20;34(6):557-65. doi: 10.1200/JCO.2015.63.0830. Epub 2015 Dec 7.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
Robert Olson, MD, MSc, FRCPC principal investigator
BC Cancer - Prince George
14 sites in 2 countries: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Single fraction SABR, Multiple fraction SABR and QoL reporting alone in people with Oligometastatic Disease and Oligoprogression, run by Robert Olson at 14 sites in 2 countries.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 19 inclusion and 18 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: looking for participants now, as of the sponsor's last update on 24 Sep 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 14 sites in Canada, Ireland. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Robert Olson, MD, MSC, FRCPC (250-645-7300, rolson2@bccancer.bc.ca), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Adverse events (time frame: At 6 weeks, 3 months, 6 months, 12 months, 18 months, 24 months, 36 months, 48 months, 60 months). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT05784428, which also lists 13 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 24 Sep 2026.