En Bloc Resection Versus Separation Surgery Combined With Radiotherapy for the Treatment of Spinal Oligometastatic Tumor.

Inclusion Criteria: * 1\) Be able to sign written informed consent. * 2\) Age range from 18 to 75 years old, regardless of gender. * 3\) Within conservative treatment, the patient still has uncontrollable pain, metastatic cancer lesions that still progress, spinal instability/potential instability, or symptoms of spinal cord/nerve compression. * 4\) After the patient underwent Positron Emission Tomography-Computed Tomography (PET-CT) examination, it was indicated that there were no more than 3 metastatic organs and no more than 5 metastatic lesions in the whole body of cancer. Among them, there was at least 1 spinal metastasis and at most 5 spinal metastases. * 5\) Imaging examinations (enhanced MRI, enhanced CT, X-ray) indicate the presence of spinal metastasis. * 6\) The expected survival period is ≥ 6 months. * 7)No other surgical contraindications Exclusion Criteria: * 1\) Primary tumors of the spine or multiple tumors of the body, with\>3 metastatic organs and\>5 metastatic sites. * 2\) Previously underwent spinal surgery, or received radiotherapy for the responsible segment of this treatment. * 3\) Severe heart, lung, liver, kidney or other diseases affecting the surgery. * 4\) Having cognitive impairment, sensory aphasia, and inability to understand basic instructions. * 5\) Participated in clinical trials of other drugs or medical devices within 3 months prior to enrollment. * 6\) Infectious diseases. * 7\) Refuse to follow up or participate. * 8\) The researchers determine that the patients are not suitable for enrollment this clinical trail.