Ablative Radiosurgery vs Stereotactic RT in 5 Fractions With SIB for Oligometastatic Bone Lesions

Study Overview
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Brief Summary
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This is a randomised prospective monoinstitutional study comparing radiosurgery at a total dose up to 24 Gy to five fraction stereotactic radiotherapy with simultaneous integrated boost (SIB) up to 50 Gy for the treatment of bone metastases in oligometastatic cancer treated with radical intent. At the end of the first 12 months from the start of the study an interim analysis will be performed taking into account all major endpoints for an initial evaluation of the study , with only an observational purpose, without subsequent protocol changes.

Detailed Description
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The study is interventional, homogeneous (performed in a single institution). Patient recruitment Patients who meet the inclusion criteria will be enrolled during the initial Radiation Oncology examination in our institution or during the multidisciplinary meeting. Recruitment and selection The patients will be informed of the possibility to participate in the study. I pazienti verranno informati ella possibilità di accedere allo studio. After a careful verification of the inclusion and exclusion criteria, and precise description of the benefits, risks and procedure of the current study, the patient will be asked to sign the informed consent and subsequently randomised. The following information will be collected for each patient, as is standard practice in our department: demographic data, clinical history, concomitant medical treatments, physical exam, blood exam, tumoral markers, diagnoses CT / Bone scintigraphy/ MRI/ PET and any other staging exam or post tumoral treatment re-evaluation performed. Randomisation A centralized randomization, with closed envelopes, will be performed by a secretary not involved in the study. Pre-treatment phase Each patient will undergo the simulation CT, in line with routine clinical practice, with immobilisation devices within 15 (+/- 5) days from the randomisation. The simulation CT will be performed in the Radiotherapy department, the MRI in the Radiology department. Treatment phase The protocol treatment uses two radiotherapy regimens with ablative doses, which are already included in the daily clinical practice at San Raffaele Scientific Institute and many other national centers equipped with High Technology. The treatment machine will be randomly assigned, depending on the availability of slots for the timing required by the protocol. The patients will be randomized at a 1:1 ratio between: Arm A: radiosurgery ( in one fraction) to the bone metastases ( 21-24 Gy in 1 fraction) Arm B: Multifractionated ablative stereotactic radiotherapy (5 fractions, one fraction per day, 5 consecutive weekdays) with SIB to the bone metastases (up to 40-50 Gy). The treatment should be completed within 1 month from the CT simulation and within 45 (+/- 5) days from randomization (first visit). Post-treatment phase: Patients will be evaluated according to departmental clinical practice: at the first visit, at the end of the treatment and at follow-up visits at 3, 6, 12, 18, 24, 36 months from the end of radiotherapy with CT and/or Bone Scan and/or MRI and/or PET/CT based on the treated sites, on the histology of primary tumor, and by means of laboratory exams. Subsequent radiological images of laboratory analyses will be performed at the discretion of the radiation oncologist, based on symptoms or clinical findings. At every visit the anamnesis, physical examination, the CTCAE(Common Terminology Criteria for Adverse Events) toxicity evaluation will be performed and registered, together with any skeletal events, re-irradiation, other systemic therapy lines, or palliative treatment. The patient will fill in the Pain Diary and the quality of life questionnaires (EORTC QLQ-C30, QLQBM22, and EQ-5D-3L). The follow-up visits will be performed in the dedicated rooms of the Radiation Oncology department.

Official Title
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A Randomised, Prospective, Monoinstitutional Study of Ablative Radiosurgery vs Stereotactic Radiotherapy in 5 Fractions, With Simultaneous Integrated Boost, for the Treatment of Bone Lesions in Oligometastatic Disease

Conditions
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Oligometastatic Disease

Intervention / Treatment
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* Radiation: radiosurgery and stereotactic ablative radiotherapy with simultaneous integrated boost, respectively


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Performance status ECOG ≤2 Life expectancy > 6 months according to Mizumoto criteria* Oligometastatic disease (Total number of metastases from 1 to 5: both synchronous and metachronous with maximum involvement of three organs in total - lymph nodes, bones, lungs, liver, adrenal gland, brain- with known histology At least one bone metastasis treatable with SABR or SRS Each secondary localization (synchronous, metachronous or oligoprogressive) must be treated with radical intent. Patients may have received other anticancer treatments (surgery for initial site of disease or other metastases, chemotherapy, radiotherapy for other metastatic sites) Exclusion Criteria: Sites of disease not eligible for stereotactic radiotherapy Serious medical comorbidities that preclude RT Overlap with a previously treated volume of radiotherapy Dimension greater than 5 cm for extra-cranial lesions. Size greater than 3 cm for brain lesions More than 1 brain metastases Clinical or radiological evidence of spinal cord compression or epidural tumor within 2mm of the spinal cord Radiological evidence of vertebral body fracture or involvement of more than 40% of the vertebral body Radiological evidence of cortical involvement in long bones Pregnant or breastfeeding women

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 85 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Interventional Model Description: The sample size calculation is based on the Kaplan-Meier estimator and uses a log-rank test (Freedman, 1982; Machin et al., 2018). Assuming for the two groups a two-year LRFS of 95% and 85%, respectively, with alpha=0.05 and power of 80%, the total number needed to identify a significant difference between the two curves is 292 (test at 2 queues, 146 patients per group). Calculations were performed with software (PASS 2021, v21.0.3). Assuming a 5% dropout, we expect to enroll 15 more patients in total, thus reaching a final number of 307.
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Arm A<br>Single fraction radiosurgery on bone metastases (21-24Gy x 1 fraction) | Radiation: radiosurgery and stereotactic ablative radiotherapy with simultaneous integrated boost, respectively<br>* Two protocols of stereotactic ablative radiotherapy, in one vs five fractions ( the later with SIB) are compared<br>|
| Active Comparator: Arm B<br>Multi-fractioned stereotactic ablative radiotherapy (5 fractions delivered in 5 consecutive working days) with SIB on bone metastases (5Gy x 5 fractions + SIB up to 40-50Gy) | Radiation: radiosurgery and stereotactic ablative radiotherapy with simultaneous integrated boost, respectively<br>* Two protocols of stereotactic ablative radiotherapy, in one vs five fractions ( the later with SIB) are compared<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Local recurrence-free surival | evaluation of the impact of stereotactic radiotherapy (one fraction versus fractionated) on local control of disease in terms of local recurrence free survival (LRFS) in patients with oligometastastic disease and at least one bone metastasis. | 3 years from the end of treatment | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Acute and late local toxicity | Impact of the two treatments on the local radioinduced toxicity in terms of incidence in skeletal events and acute and late toxicity measured with the Common Terminology Criteria for Adverse Events v5.0 scale | Changes form baseline at 3 years from the end of treatment | 
| Pain control | Pain control of symptomatic bone lesions measured through the variation of pain diary | Changes form baseline at 3 years from the end of treatment | 
| Overall survival | Overall-surival | 3 years from the end of treatment | 
| Cancer Specific Survival | Cancer Specific Survival | 3 years from the end of treatment | 
| Progression to polymetastatic disease | Impact of the two treatments on the rate of progression to polymethastatic disease | 3 years from the end of treatment | 
| Adjusted disease-free survival | defined as the time between the end of radiotherapy and the date of disease progression (local or distant) or the start of therapy (systemic or palliative) | 3 years from the end of treatment | 
| Incidence of Treatment-Emergent Adverse Events as assessed by EORTC-QLQ-C30 | Quality-of-life assessed by EORTC-QLQ-C30 questionnaire | Changes from baseline at 3 years after the treatment | 
| Incidence of Treatment-Emergent Adverse Events as assessed by EORTC-QLQ-BM22 | Quality-of-life assessed by EORTC-QLQ-BM22 questionnaire | Changes from baseline at 3 years after the treatment | 
| Satisfaction assessed by EQ-5D-3L | Quality-of-life assessed by EQ-5D-3L questionnaire | Changes from baseline at 3 years after the treatment | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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SBRT, Simultaneous Integrated Boost, Oligometastatic Disease, Bone Metastases