1Current status and prospects of immunotherapy for osteosarcomaCAI LinEditorial1-42Synchronous multifocal otesosarcoma: a case report and literature reviewHAN Qi-xiu, ZHU Yan, FAN Gen-tao, ZHU Jie, CAI Meng, ZHOU Guang-xinOsteosarcoma5-113Construction of a nomogram of lung metastasis risk based on seer database for patients with osteosarcoma of the extremitiesYE Xu-hao, LI Wen-leOsteosarcoma12-184Establishment and assessment of a predictive model of lung metastasis from chondrosarcoma by machine learning and columnar line graphsLIN Yue-wei, HUANG Yong-ming, LI Wen-le, LIU QiangOsteosarcoma19-265Efficacy of thalidomide in alleviating adverse reactions induced by apatinib in bone and soft-tissue carcinoma: a retrospective cohort studyQING Yan-wei, HU Hai-yan, LIU Yuan, ZHANG Lin, YANG Cheng, WANG QiongOsteosarcoma27-316Investigation of perioperative quality of life in patients with primary liver cancer and spinal metastasisCHEN Feng-mei, LIU Li, WANG Yi, JIANG ShuaiOriginal article32-357Design concept and initial clinical application of a double-motion hemipelvic prosthesis for pelvic tumor resection and reconstructionWANG Miao, XU Chang-li, WANG Bin-xuan, LIU Chang, LI Bo, QI Ke, LIU Tian-ze, LI Cheng, WANG Zhi-weiOriginal article36-438The application of Mast Quadrant-assisted curettage plus cementoplasty in the management of metastatic acetabular tumorsYAN Qiong, SU Jia-jia, HE Si-yuan, LEI Jun, CAI Lin, DENG Zhou-mingClinical research and practice44-499Decortication combined with locking plate fixation for the treatment of bone shaft nonunion in extremitiesWU Zuo-pei, WANG Yan, MENG Xiang-sheng, CHEN Jia-cheng, JING Sheng, SUN XiaoClinical research and practice50-5310The influence of bone cement distribution on clinical efficacy of PKP in treatment of OVCF and recurrence of adjacent vertebral fracturesTANG Guang-man, TANG Ke, ZHANG YeClinical research and practice54-5711Advances in the study of microrna-related non-coding long RNA in osteosarcomaLIU Hao-yang, XU Ning, TIAN Ji-chao, SHAO Shuai-ming, LIU Wei-yu, YANG Wei-liangReview58-6312The role of histone deacetylase and its inhibitors in the molecular mechanism of osteosarcomaXU Hong, SUN Hong, YANG kun, XIANG YangReview64-6813Common complications of percutaneous endoscopic lumbar discectomy and its prevention and treatmentZHANG Wen-tao, YANG Ming, SUN Tian-ze, LI Zhong-haiReview69-7514A case of brown tumor misdiagnosed as giant cell tumor of boneMA Ru-lan, YE Hai-xia, JIA Rui, GONG Mei-jun, ZHANG Yun, LI KangCase report76-79 