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

Overview

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.

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.