Could less radiation be just as good for bone cancer pain?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Patient with bone pain related to at least 1 or more bone metastases of spinal location, contiguous or not, cervical (excluding C1), thoracic, lumbar or sacral up to and including S2; a patient can be included even if he or she is irradiated concomitantly or not for analgesic purposes on another non-spinal bone metastatic site. Bone lesions are objective on an imaging examination less than 3 months old: CT and/or MRI and/or PET and/or bone scintigraphy; * Patient with at least moderate pain with EN ≥ 5; * Patient on analgesic drug treatment for at least 7 days or poor tolerance of analgesics; * Patient irradiated for palliative analgesic purposes. Post-cementoplasty irradiation is possible; an extension to the soft tissues is not a contraindication to inclusion; * Patient with a validated palliative bone irradiation plan: 8 Gy / 1 fr or 20 Gy / 5 fr; * Patient with planning only in static IMRT, arc therapy or helical tomotherapy; * Patient with a primary cancer or a haemopathy; * Patient currently undergoing or not a specific oncological systemic treatment, left to the discretion of the investigating physician; * Patient currently undergoing or not a treatment with bisphosphonates and denosumab, left to the discretion of the investigating physician; * WHO ≤ 2; * Patient with a life expectancy ≥ 3 months; * Patient able and agreeing to follow all study procedures in accordance with the protocol; * Patient having understood, signed and dated the consent form; * Patient affiliated to the social security system. Exclusion Criteria: * Pediatric patient; * Patient undergoing stereotaxic irradiation; * Patient undergoing oligometastatic disease; * Patient undergoing re-irradiation unless the dose is not limiting to OARs; * Patient treated with RT2D (conventional 2-dimensional radiotherapy) or RT3D (conventional 3-dimensional radiotherapy); * Patient with MESCC (metastatic epidural spinal cord compression) except for a Bilsky grade \< 1b; * Patient who does not have a means of responding to online questionnaires; * Patient and their entourage who cannot read or express themselves in French; * Visually impaired patient; * Patient already included in another therapeutic trial with an experimental molecule; * Persons deprived of liberty or under guardianship (including curatorship). * Pregnant woman, likely to be pregnant, or breastfeeding