Breast Cancer, MetastaticAVATARIINCT06882499
Stereotactic Ablative Body Radiotherapy (SABR) With Maintenance of Systemic Therapy Versus Physicians' Choice of Systemic Therapy for Oligoprogressive ER-positive, Her-2 Negative Breast Cancer II
A study testing Stereotactic Ablative Radiotherapy and Physician's choice of systemic treatment in people with Breast Cancer, Metastatic and Metastatic Breast Cancer, run by Peter MacCallum Cancer Centre, Australia.
Trial summary
The goal of this clinical trial is to assess Stereotactic Ablative Radiotherapy (SABR) as a method to delay a change in systemic therapy in patients with oligoprogressive ER-positive, HER2-negative advanced breast cancer. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Breast Cancer, Metastatic, Metastatic Breast Cancer
- What is being tested?
- Stereotactic Ablative Radiotherapy and Physician's choice of systemic treatment
- Type of treatment
- Surgery or procedure
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 74 participants
- Where
- No sites listed yet
- Study dates
- 1 Nov 2026to 1 Nov 2032
- 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
- Patients will be eligible for inclusion in this trial if all the following criteria apply:
- Patient has signed the AVATAR-II Patient Information and Consent Form (PICF)
- Male or female, ≥ 18 years of age at the time signing consent
- Patients with histologically proven ER-positive, HER2-negative advanced breast cancer receiving an ET in combination with a CDK 4/6 inhibitor. Biopsy of metastatic disease if technically feasible but not mandatory
- Patients must have evidence of extracranial metastatic disease, with no evidence of uncontrolled intracranial metastases. (Controlled intracranial metastases are defined as stable disease on repeat CT imaging performed at least one month apart.)
- Patients must have evidence of radiological response to ET and CDK 4/6 inhibitor for a minimum of six months prior to randomisation.
Show all 16Show fewer
- Note: Patient must have ongoing stability/response in at least one lesion at the time of randomisation.
- Evidence of new or existing OPD, as determined by the Investigator and defined according to RECIST1.1, via CT on a per-lesion basis (between 1-5 metastases, including the primary) as follows:
- At least a 20% increase in the diameter of a lesion, taking as reference the smallest diameter on a previous CT scan with an absolute increase of at least 5mm
- Appearance of a new lesion(s) Note: A new lesion can be identified using various imaging modalities, such as PET-CT or WBBS, as long as the lesion is visible on serial CT scans.
- For patients with liver or lung metastases, maximum of 3 oligoprogressive lesions in single organ
- All OPD must be amenable to SABR, as per the radiotherapy guidelines in section 11.1 and Appendix 4 and 5 of Protocol v2.3 dated 20Feb2026
- ECOG performance status 0-2
- Life expectancy ≥ 6 months
- Clinician and patient are willing to continue current line of therapy if randomised to Arm A
- Patient is able to complete QoL questionnaires, and other assessments required as part of the study
Who cannot join
- Patients will not be eligible for inclusion in this trial if any of the following criteria apply:
- Is pregnant or lactating at the time of randomisation
- Evidence of more than one clone of metastatic disease e.g., a patient with both ER-positive and triple negative clones of disease and ER-negative and/or HER2-positive disease would be excluded from the study
- Evidence of leptomeningeal disease
- Evidence of malignant cord compression
- Evidence of lesion within femoral bone requiring surgical fixation
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- Patients with risk of bone fracture are not candidate for SABR (Appendix 4 and 5 of Protocol v2.3 dated 20Feb2026)
- Previous chemotherapy for metastatic disease. Note: chemotherapy for primary breast cancer is allowed
- Contraindications to radiotherapy
- Any condition deeming the patient unsuitable to comply with the study
- Substantial overlap with previously treated area. Reirradiation is permitted with the condition that the combined plan adheres to the specific dose constraints outlined in this protocol. It is advised to use biological effective dose (BED) calculations to correlate previous doses with the tolerance doses documented in the protocol
- Evidence of progression in more than 5 lesions
- Prior SABR delivered for oligoprogressive disease with the intent of delaying a change in systemic therapy.
Trial locations and contacts
No sites are listed yet. Contact the study team or a site near you to ask about taking part.
About this study
The goal of this clinical trial is to assess Stereotactic Ablative Radiotherapy (SABR) as a method to delay a change in systemic therapy in patients with oligoprogressive ER-positive, HER2-negative advanced breast cancer. The main question it aims to answer is to assess whether the addition of SABR to continuation of first line endocrine therapy and CDK 4/6 inhibitor (Arm A) to patients with oligoprogressive ER-positive, HER2-negative advanced breast cancer could have longer time to treatment failure (TTF) in comparison to physician choice of systemic treatment (Arm B) in patients who had progressed first line.
The treatment strategy in Arm A is to maintain patients on current endocrine therapy and CDK 4/6 inhibitor, controlling localised progressing sites of disease with SABR. Treatment strategy in Arm B is to maintain disease control with physician's choice of systemic therapy alone.
Read the detailed description
AVATAR II is a phase II multicentre open label, randomised trial. Following informed consent, eligible patients with ER-positive, HER2-negative advanced breast cancer receiving an ET (either AI or selective estrogen receptor degrader in combination with a CDK 4/6 inhibitor with newly diagnosed OPD amenable to SABR will be randomised to either:
Arm A: SABR to all known sites of OPD with continuation of first line therapy ET and CDK 4/6 inhibitor Arm B: Physician's choice of systemic treatment
Patients must have evidence of radiological response to ET and CDK 4/6 inhibitor for a minimum of six months prior to randomisation.
All patients will be followed up for 3 years after the last patient has been randomised.
- Being tested
- Stereotactic Ablative Radiotherapy, Physician's choice of systemic treatment
- Keywords
- ER-positive, HER2-negative, selective estrogen receptor degrader, endocrine therapy, aromatase inhibitor, CDK 4/6 inhibitor, SABR, oligoprogression, oligometastases, oligometastatic, sbrt
- Medical subject headings
- Breast Neoplasms, Neoplasm Metastasis
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Stereotactic Ablative RadiotherapyRadiation
Stereotactic Ablative Radiotherapy
Physician's choice of systemic treatmentOther
Physician's choice of systemic therapy does not mandate a change in systemic therapy, however, SABR is not permitted for management in this arm
| Study group | Role | What they receive |
|---|---|---|
| SABR to all known sites of oligoprogressive disease with continuation of first line therapy | Experimental | SABR to all known sites of oligoprogressive disease with continuation of first line therapy ET + CDK4/6i Receives: Radiation: Stereotactic Ablative Radiotherapy |
| Physician's choice of systemic treatment | Active comparator | Physician's choice of systemic treatment does not mandate a change in systemic therapy, however, SABR is not permitted for management in this arm Receives: Other: Physician's choice of systemic treatment |
What is being measured
The primary outcome is the main question the study is designed to answer.
Primary Outcome Measure
The primary endpoint of this study is to measure the time to treatment failure between Arm A and Arm B.
Treatment failure is defined as time from randomisation to progression of disease resulting in a failure of treatment strategy or death by any cause.
Progression, will be determined by the Investigator, using the Response Evaluation Criteria in Solid Tumors, Version 1.1. (RECIST1.1; Appendix 2) (33) as a guide.
The treatment strategy in Arm A is to maintain patients on current ET and CDK 4/6 inhibitor, controlling localised progressing sites of disease with SABR. Treatment strategy in Arm B is to maintain disease control with physician's choice systemic therapy alone.
Measured: Time from randomisation to progression of disease resulting in a failure of treatment strategy or death by any cause assessed until withdrawal of consent, death, or 3 years after the last patient has been randomised, whichever is earlier.
Secondary outcomes (6)
Secondary Objective 1
To compare PFS; PFS is assessed from randomisation to the date of the first evidence of progression or death by any cause. Progression will be assessed by the treating clinician as part of standard-of-care practice, using RECIST 1.1 as a guide or based on clinical progression.
Measured: Time from randomisation to progression of disease resulting in a failure of treatment strategy or death by any cause assessed until withdrawal of consent, death, or 3 years after the last patient has been randomised, whichever is earlier.
Secondary Objective 2
To compare progression-free survival 2 (PFS-2); PFS-2 is assessed from randomisation to the date of progression on next line of systemic anti-cancer treatment or death by any cause.
Measured: Time from randomisation to progression of disease resulting in a failure of treatment strategy or death by any cause assessed until withdrawal of consent, death, or 3 years after the last patient has been randomised, whichever is earlier.
Secondary Objective 3
To compare PFS of next line of treatment (2nd PFS); 2nd PFS is assessed from failure of treatment strategy to progression on next line of systemic anti-cancer treatment or date of death by any cause.
Measured: Time from randomisation to progression of disease resulting in a failure of treatment strategy or death by any cause assessed until withdrawal of consent, death, or 3 years after the last patient has been randomised, whichever is earlier.
Secondary Objective 4
To compare OS; OS is assessed from randomisation to the date of death by any cause.
Measured: Time from randomisation to progression of disease resulting in a failure of treatment strategy or death by any cause assessed until withdrawal of consent, death, or 3 years after the last patient has been randomised, whichever is earlier.
Secondary Objective 5
To compare treatment related adverse events (TRAEs); TRAEs are adverse events assessed using the Common Terminology for Adverse Events Version 5.0 (CTCAE v5.0) considered possibly, probably, or definitely related to treatment (systemic therapy or SABR)
Measured: Time from randomisation to progression of disease resulting in a failure of treatment strategy or death by any cause assessed until withdrawal of consent, death, or 3 years after the last patient has been randomised, whichever is earlier.
Secondary Objective 6
To compare the QoL using the FACT-B total score: Area under the curve (AUC) of the FACT-B Total score from baseline to 48 weeks
Measured: Time from randomisation to progression of disease resulting in a failure of treatment strategy or death by any cause assessed until withdrawal of consent, death, or 3 years after the last patient has been randomised, whichever is earlier.
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted18 Mar 2025
- Study start1 Nov 2026 (estimated)
- Primary completion1 Nov 2032 (estimated)
- Study completion1 Nov 2032 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (33)Papers the sponsor has linked to this study.
- Other trials for Breast Cancer, MetastaticStudies 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
- Parallel groups
- Masking
- None (open label)
- Enrolment
- 74 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Peter MacCallum Cancer Centre, Australia
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
- Investigators
- A/Prof Steven David, Principal investigator, Peter MacCallum Cancer Centre, Australia
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT06882499
- Sponsor's protocol ID
- PMC105165 (24/143)
- Acronym
- AVATARII
- Status last verified
- Sep 2026
- First submitted
- 8 Dec 2024
- Last updated
- 18 Sep 2026
- Results posted
- No
- Data monitoring committee
- Yes
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No: Not contractually obliged but it may be considered
Publications
Alomran R, White M, Bruce M, Bressel M, Roache S, Karroum L, Hanna GG, Siva S, Goel S, David S. Stereotactic radiotherapy for oligoprogressive ER-positive breast cancer (AVATAR). BMC Cancer. 2021 Mar 23;21(1):303. doi: 10.1186/s12885-021-08042-w.
PubMed 33757458David SP, Siva S, Bressel M, Tan J, Hanna GG, Alomran RK, et al. Stereotactic Ablative Body Radiotherapy (SABR) for Oligoprogressive ER-Positive Breast Cancer (AVATAR): A Phase II Prospective Multicenter Trial. International journal of radiation oncology, biology, physics. 2023;117(4):e6-e.
Kelly P, Ma Z, Baidas S, Moroose R, Shah N, Dagan R, Mamounas E, Rineer J. Patterns of Progression in Metastatic Estrogen Receptor Positive Breast Cancer: An Argument for Local Therapy. Int J Breast Cancer. 2017;2017:1367159. doi: 10.1155/2017/1367159. Epub 2017 Sep 25.
PubMed 29147583Patel 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 31182289Cheung P. Stereotactic body radiotherapy for oligoprogressive cancer. Br J Radiol. 2016 Oct;89(1066):20160251. doi: 10.1259/bjr.20160251. Epub 2016 Aug 24.
PubMed 27556349Chan OSH, Lee VHF, Mok TSK, Mo F, Chang ATY, Yeung RMW. The Role of Radiotherapy in Epidermal Growth Factor Receptor Mutation-positive Patients with Oligoprogression: A Matched-cohort Analysis. Clin Oncol (R Coll Radiol). 2017 Sep;29(9):568-575. doi: 10.1016/j.clon.2017.04.035. Epub 2017 May 9.
PubMed 28499791Weickhardt AJ, Scheier B, Burke JM, Gan G, Lu X, Bunn PA Jr, Aisner DL, Gaspar LE, Kavanagh BD, Doebele RC, Camidge DR. Local ablative therapy of oligoprogressive disease prolongs disease control by tyrosine kinase inhibitors in oncogene-addicted non-small-cell lung cancer. J Thorac Oncol. 2012 Dec;7(12):1807-1814. doi: 10.1097/JTO.0b013e3182745948.
PubMed 23154552Xu Q, Liu H, Meng S, Jiang T, Li X, Liang S, Ren S, Zhou C. First-line continual EGFR-TKI plus local ablative therapy demonstrated survival benefit in EGFR-mutant NSCLC patients with oligoprogressive disease. J Cancer. 2019 Jan 1;10(2):522-529. doi: 10.7150/jca.26494. eCollection 2019.
PubMed 30719148Qiu B, Liang Y, Li Q, Liu G, Wang F, Chen Z, Liu M, Zhao M, Liu H. Local Therapy for Oligoprogressive Disease in Patients With Advanced Stage Non-small-cell Lung Cancer Harboring Epidermal Growth Factor Receptor Mutation. Clin Lung Cancer. 2017 Nov;18(6):e369-e373. doi: 10.1016/j.cllc.2017.04.002. Epub 2017 Apr 12.
PubMed 28465010Iyengar P, Kavanagh BD, Wardak Z, Smith I, Ahn C, Gerber DE, Dowell J, Hughes R, Abdulrahman R, Camidge DR, Gaspar LE, Doebele RC, Bunn PA, Choy H, Timmerman R. Phase II trial of stereotactic body radiation therapy combined with erlotinib for patients with limited but progressive metastatic non-small-cell lung cancer. J Clin Oncol. 2014 Dec 1;32(34):3824-30. doi: 10.1200/JCO.2014.56.7412. Epub 2014 Oct 27.
PubMed 25349291Hortobagyi GN, Stemmer SM, Burris HA, Yap YS, Sonke GS, Paluch-Shimon S, Campone M, Petrakova K, Blackwell KL, Winer EP, Janni W, Verma S, Conte P, Arteaga CL, Cameron DA, Mondal S, Su F, Miller M, Elmeliegy M, Germa C, O'Shaughnessy J. Updated results from MONALEESA-2, a phase III trial of first-line ribociclib plus letrozole versus placebo plus letrozole in hormone receptor-positive, HER2-negative advanced breast cancer. Ann Oncol. 2018 Jul 1;29(7):1541-1547. doi: 10.1093/annonc/mdy155.
PubMed 29718092Tripathy D, Im SA, Colleoni M, Franke F, Bardia A, Harbeck N, Hurvitz SA, Chow L, Sohn J, Lee KS, Campos-Gomez S, Villanueva Vazquez R, Jung KH, Babu KG, Wheatley-Price P, De Laurentiis M, Im YH, Kuemmel S, El-Saghir N, Liu MC, Carlson G, Hughes G, Diaz-Padilla I, Germa C, Hirawat S, Lu YS. Ribociclib plus endocrine therapy for premenopausal women with hormone-receptor-positive, advanced breast cancer (MONALEESA-7): a randomised phase 3 trial. Lancet Oncol. 2018 Jul;19(7):904-915. doi: 10.1016/S1470-2045(18)30292-4. Epub 2018 May 24.
PubMed 29804902Goetz MP, Toi M, Campone M, Sohn J, Paluch-Shimon S, Huober J, Park IH, Tredan O, Chen SC, Manso L, Freedman OC, Garnica Jaliffe G, Forrester T, Frenzel M, Barriga S, Smith IC, Bourayou N, Di Leo A. MONARCH 3: Abemaciclib As Initial Therapy for Advanced Breast Cancer. J Clin Oncol. 2017 Nov 10;35(32):3638-3646. doi: 10.1200/JCO.2017.75.6155. Epub 2017 Oct 2.
PubMed 28968163Johnston S, Martin M, Di Leo A, Im SA, Awada A, Forrester T, Frenzel M, Hardebeck MC, Cox J, Barriga S, Toi M, Iwata H, Goetz MP. MONARCH 3 final PFS: a randomized study of abemaciclib as initial therapy for advanced breast cancer. NPJ Breast Cancer. 2019 Jan 17;5:5. doi: 10.1038/s41523-018-0097-z. eCollection 2019.
PubMed 30675515Turner NC, Slamon DJ, Ro J, Bondarenko I, Im SA, Masuda N, Colleoni M, DeMichele A, Loi S, Verma S, Iwata H, Harbeck N, Loibl S, Andre F, Puyana Theall K, Huang X, Giorgetti C, Huang Bartlett C, Cristofanilli M. Overall Survival with Palbociclib and Fulvestrant in Advanced Breast Cancer. N Engl J Med. 2018 Nov 15;379(20):1926-1936. doi: 10.1056/NEJMoa1810527. Epub 2018 Oct 20.
PubMed 30345905
Study at a glance
From the registry record, last updated by the sponsor on 18 Sep 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Stereotactic Ablative Body Radiotherapy (SABR) With Maintenance of Systemic Therapy Versus Physicians' Choice of Systemic Therapy for Oligoprogressive ER-positive, Her-2 Negative Breast Cancer II
- ClinicalTrials.gov ID
- NCT06882499
- Acronym / sponsor ID
- AVATARII / PMC105165 (24/143)
- Keywords
- ER-positive, HER2-negative, selective estrogen receptor degrader, endocrine therapy, aromatase inhibitor, CDK 4/6 inhibitor, SABR, oligoprogression, oligometastases
- Study type
- Interventional
- Recruitment status
- Not yet recruiting
- Enrolment
- 74 participants (estimated)
- Lead sponsor
- Peter MacCallum Cancer Centre, AustraliaUniversity, hospital or other
- Study start
- 1 Nov 2026 (estimated)
- Primary completion
- 1 Nov 2032 (estimated)
- Study completion
- 1 Nov 2032 (estimated)
- First posted
- 18 Mar 2025 (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.
The goal of this clinical trial is to assess Stereotactic Ablative Radiotherapy (SABR) as a method to delay a change in systemic therapy in patients with oligoprogressive ER-positive, HER2-negative advanced breast cancer. The main question it aims to answer is to assess whether the addition of SABR to continuation of first line endocrine therapy and CDK 4/6 inhibitor (Arm A) to patients with oligoprogressive ER-positive, HER2-negative advanced breast cancer could have longer time to treatment failure (TTF) in comparison to physician choice of systemic treatment (Arm B) in patients who had progressed first line.
The treatment strategy in Arm A is to maintain patients on current endocrine therapy and CDK 4/6 inhibitor, controlling localised progressing sites of disease with SABR. Treatment strategy in Arm B is to maintain disease control with physician's choice of systemic therapy alone.
Detailed description
AVATAR II is a phase II multicentre open label, randomised trial. Following informed consent, eligible patients with ER-positive, HER2-negative advanced breast cancer receiving an ET (either AI or selective estrogen receptor degrader in combination with a CDK 4/6 inhibitor with newly diagnosed OPD amenable to SABR will be randomised to either:
Arm A: SABR to all known sites of OPD with continuation of first line therapy ET and CDK 4/6 inhibitor Arm B: Physician's choice of systemic treatment
Patients must have evidence of radiological response to ET and CDK 4/6 inhibitor for a minimum of six months prior to randomisation.
All patients will be followed up for 3 years after the last patient has been randomised.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| SABR to all known sites of oligoprogressive disease with continuation of first line therapy | Experimental | Radiation: Stereotactic Ablative RadiotherapySABR to all known sites of oligoprogressive disease with continuation of first line therapy ET + CDK4/6i |
| Physician's choice of systemic treatment | Active comparator | Other: Physician's choice of systemic treatmentPhysician's choice of systemic treatment does not mandate a change in systemic therapy, however, SABR is not permitted for management in this arm |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (16 listed)
- Patients will be eligible for inclusion in this trial if all the following criteria apply:
- Patient has signed the AVATAR-II Patient Information and Consent Form (PICF)
- Male or female, ≥ 18 years of age at the time signing consent
- Patients with histologically proven ER-positive, HER2-negative advanced breast cancer receiving an ET in combination with a CDK 4/6 inhibitor. Biopsy of metastatic disease if technically feasible but not mandatory
- Patients must have evidence of extracranial metastatic disease, with no evidence of uncontrolled intracranial metastases. (Controlled intracranial metastases are defined as stable disease on repeat CT imaging performed at least one month apart.)
Key exclusion criteria (13 listed)
- Patients will not be eligible for inclusion in this trial if any of the following criteria apply:
- Is pregnant or lactating at the time of randomisation
- Evidence of more than one clone of metastatic disease e.g., a patient with both ER-positive and triple negative clones of disease and ER-negative and/or HER2-positive disease would be excluded from the study
- Evidence of leptomeningeal disease
- Evidence of malignant cord compression
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 |
|---|---|---|
| Stereotactic Ablative RadiotherapyStereotactic Ablative Radiotherapy | Radiation | SABR to all known sites of oligoprogressive disease with continuation of first line therapy |
| Physician's choice of systemic treatmentPhysician's choice of systemic therapy does not mandate a change in systemic therapy, however, SABR is not permitted for management in this arm | Other | Physician's choice of systemic treatment |
Primary outcome
Primary Outcome Measure
Time frame: Time from randomisation to progression of disease resulting in a failure of treatment strategy or death by any cause assessed until withdrawal of consent, death, or 3 years after the last patient has been randomised, whichever is earlier.
The primary endpoint of this study is to measure the time to treatment failure between Arm A and Arm B. Treatment failure is defined as time from randomisation to progression of disease resulting in a failure of treatment strategy or death by any cause. Progression, will be determined by the Investigator, using the Response Evaluation Criteria in Solid Tumors, Version 1.1. (RECIST1.1; Appendix 2) (33) as a guide. The treatment strategy in Arm A is to maintain patients on current ET and CDK 4/6 inhibitor, controlling localised progressing sites of disease with SABR. Treatment strategy in Arm B is to maintain disease control with physician's choice systemic therapy alone.
6 secondary outcomes
Secondary Objective 1
Time frame: Time from randomisation to progression of disease resulting in a failure of treatment strategy or death by any cause assessed until withdrawal of consent, death, or 3 years after the last patient has been randomised, whichever is earlier.
Secondary Objective 2
Time frame: Time from randomisation to progression of disease resulting in a failure of treatment strategy or death by any cause assessed until withdrawal of consent, death, or 3 years after the last patient has been randomised, whichever is earlier.
Secondary Objective 3
Time frame: Time from randomisation to progression of disease resulting in a failure of treatment strategy or death by any cause assessed until withdrawal of consent, death, or 3 years after the last patient has been randomised, whichever is earlier.
Secondary Objective 4
Time frame: Time from randomisation to progression of disease resulting in a failure of treatment strategy or death by any cause assessed until withdrawal of consent, death, or 3 years after the last patient has been randomised, whichever is earlier.
Secondary Objective 5
Time frame: Time from randomisation to progression of disease resulting in a failure of treatment strategy or death by any cause assessed until withdrawal of consent, death, or 3 years after the last patient has been randomised, whichever is earlier.
Secondary Objective 6
Time frame: Time from randomisation to progression of disease resulting in a failure of treatment strategy or death by any cause assessed until withdrawal of consent, death, or 3 years after the last patient has been randomised, whichever is earlier.
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 18 Sep 2026.
- Background: PubMed 33757458Alomran R, White M, Bruce M, Bressel M, Roache S, Karroum L, Hanna GG, Siva S, Goel S, David S. Stereotactic radiotherapy for oligoprogressive ER-positive breast cancer (AVATAR). BMC Cancer. 2021 Mar 23;21(1):303. doi: 10.1186/s12885-021-08042-w.
- BackgroundDavid SP, Siva S, Bressel M, Tan J, Hanna GG, Alomran RK, et al. Stereotactic Ablative Body Radiotherapy (SABR) for Oligoprogressive ER-Positive Breast Cancer (AVATAR): A Phase II Prospective Multicenter Trial. International journal of radiation oncology, biology, physics. 2023;117(4):e6-e.
- Background: PubMed 29147583Kelly P, Ma Z, Baidas S, Moroose R, Shah N, Dagan R, Mamounas E, Rineer J. Patterns of Progression in Metastatic Estrogen Receptor Positive Breast Cancer: An Argument for Local Therapy. Int J Breast Cancer. 2017;2017:1367159. doi: 10.1155/2017/1367159. Epub 2017 Sep 25.
- 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 27556349Cheung P. Stereotactic body radiotherapy for oligoprogressive cancer. Br J Radiol. 2016 Oct;89(1066):20160251. doi: 10.1259/bjr.20160251. Epub 2016 Aug 24.
- Background: PubMed 28499791Chan OSH, Lee VHF, Mok TSK, Mo F, Chang ATY, Yeung RMW. The Role of Radiotherapy in Epidermal Growth Factor Receptor Mutation-positive Patients with Oligoprogression: A Matched-cohort Analysis. Clin Oncol (R Coll Radiol). 2017 Sep;29(9):568-575. doi: 10.1016/j.clon.2017.04.035. Epub 2017 May 9.
- Background: PubMed 23154552Weickhardt AJ, Scheier B, Burke JM, Gan G, Lu X, Bunn PA Jr, Aisner DL, Gaspar LE, Kavanagh BD, Doebele RC, Camidge DR. Local ablative therapy of oligoprogressive disease prolongs disease control by tyrosine kinase inhibitors in oncogene-addicted non-small-cell lung cancer. J Thorac Oncol. 2012 Dec;7(12):1807-1814. doi: 10.1097/JTO.0b013e3182745948.
- Background: PubMed 30719148Xu Q, Liu H, Meng S, Jiang T, Li X, Liang S, Ren S, Zhou C. First-line continual EGFR-TKI plus local ablative therapy demonstrated survival benefit in EGFR-mutant NSCLC patients with oligoprogressive disease. J Cancer. 2019 Jan 1;10(2):522-529. doi: 10.7150/jca.26494. eCollection 2019.
- Background: PubMed 28465010Qiu B, Liang Y, Li Q, Liu G, Wang F, Chen Z, Liu M, Zhao M, Liu H. Local Therapy for Oligoprogressive Disease in Patients With Advanced Stage Non-small-cell Lung Cancer Harboring Epidermal Growth Factor Receptor Mutation. Clin Lung Cancer. 2017 Nov;18(6):e369-e373. doi: 10.1016/j.cllc.2017.04.002. Epub 2017 Apr 12.
- Background: PubMed 25349291Iyengar P, Kavanagh BD, Wardak Z, Smith I, Ahn C, Gerber DE, Dowell J, Hughes R, Abdulrahman R, Camidge DR, Gaspar LE, Doebele RC, Bunn PA, Choy H, Timmerman R. Phase II trial of stereotactic body radiation therapy combined with erlotinib for patients with limited but progressive metastatic non-small-cell lung cancer. J Clin Oncol. 2014 Dec 1;32(34):3824-30. doi: 10.1200/JCO.2014.56.7412. Epub 2014 Oct 27.
- Background: PubMed 29718092Hortobagyi GN, Stemmer SM, Burris HA, Yap YS, Sonke GS, Paluch-Shimon S, Campone M, Petrakova K, Blackwell KL, Winer EP, Janni W, Verma S, Conte P, Arteaga CL, Cameron DA, Mondal S, Su F, Miller M, Elmeliegy M, Germa C, O'Shaughnessy J. Updated results from MONALEESA-2, a phase III trial of first-line ribociclib plus letrozole versus placebo plus letrozole in hormone receptor-positive, HER2-negative advanced breast cancer. Ann Oncol. 2018 Jul 1;29(7):1541-1547. doi: 10.1093/annonc/mdy155.
- Background: PubMed 29804902Tripathy D, Im SA, Colleoni M, Franke F, Bardia A, Harbeck N, Hurvitz SA, Chow L, Sohn J, Lee KS, Campos-Gomez S, Villanueva Vazquez R, Jung KH, Babu KG, Wheatley-Price P, De Laurentiis M, Im YH, Kuemmel S, El-Saghir N, Liu MC, Carlson G, Hughes G, Diaz-Padilla I, Germa C, Hirawat S, Lu YS. Ribociclib plus endocrine therapy for premenopausal women with hormone-receptor-positive, advanced breast cancer (MONALEESA-7): a randomised phase 3 trial. Lancet Oncol. 2018 Jul;19(7):904-915. doi: 10.1016/S1470-2045(18)30292-4. Epub 2018 May 24.
- Individual participant dataSharing planned: No. Not contractually obliged but it may be considered
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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.
A/Prof Steven David principal investigator
Peter MacCallum Cancer Centre, Australia
Questions about this trial
What is this clinical trial studying?
A study testing Stereotactic Ablative Radiotherapy and Physician's choice of systemic treatment in people with Breast Cancer, Metastatic and Metastatic Breast Cancer, run by Peter MacCallum Cancer Centre, Australia.
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 16 inclusion and 13 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: opening soon, as of the sponsor's last update on 18 Sep 2026. Status can change between updates, so confirm with the study contact before making plans.
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 A/Prof Steven David (+61 3 9928 9801, steven.david@petermac.org), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Primary Outcome Measure (time frame: Time from randomisation to progression of disease resulting in a failure of treatment strategy or death by any cause assessed until withdrawal of consent, death, or 3 years after the last patient has been randomised, whichever is earlier.). 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 NCT06882499, which also lists 33 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 18 Sep 2026.