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Objective To explore the possible molecular regulation mechanism of COPB2 on human osteosarcoma cells based on the bioinformatics analysis of ingenuity pathway analysis (IPA). Methods RT-qPCR was used to detect the expression levels of COPB2 in human osteosarcoma cell lines U-2OS, MG-63, HOS and Saos-2. U-2OS was used as the research object and divided into silence group (KD) and control group (NC). U-2OS cells were infected by green fluorescent protein-labeled lentivirus and the KD group contained COPB2 silenced sequence. Human gene expression profiling microarray was used to detect the difference in gene expression profile of U-2OS cells after COPB2 silencing. The detection information was input into the IPA software for bioinformatics analysis, including classical pathway analysis, upstream regulation analysis, disease function analysis, regulatory effect analysis and interaction network analysis. Results COPB2 had a high expressive abundance in four human osteosarcoma cell lines. There were significant differences in the expression of 1393 genes between KD group and NC group; 831 genes were up-regulated and 562 genes were down-regulated. After COPB2 knockdown, the inhibition of angiogenesis by TSP1 pathway and acute phase response pathway were significantly activated, while cyclins and cell cycle regulation pathway were significantly inhibited. COPB2 mainly affected neoplasia, invasion and anoikis of osteosarcoma cells. Conclusion COPB2 is highly expressed in human osteosarcoma cell lines, and might be involved in the development of osteosarcoma through cyclins and cell cycle regulation pathway. In addition, COPB2 is associated with neoplasia, invasion and anoikis of osteosarcoma cells.

Objective To evaluate the safety and efficacy of percutaneous vertebroplasty(PVP) in the treatment of spinal metastases with incomplete posterior wall. Methods We retrospectively analyzed 106 spinal metastases patients with incomplete posterior wall treated with PVP. Demographic and pre- and post-operative clinical characteristics were reviewed. Pain relief and functional activities recovery, systemic complications and the local leakage of the bone cement were evaluated before and after operation. Results All patients successfully underwent surgery, VAS score was 3.0(2.0-5.0) after operation and decreased for 5.0(3.0-7.0). Among 70 patients who received the assessment, 10 patients had a better Barthel Index(BI) and 46 patients were with the same activity of daily living. None had systemic complications during the injection of bone cement. Among the 160 vertebrae with incomplete vertebral posterior wall, 39(24.4%) vertebrae showed bone cement leakage and 7(4.4%) vertebrae were intraspinal leakage. None had bone cement leakage-related neurological symptoms after operation. Conclusion Percutaneous vertebroplasty is effective and safe in the treatment of spinal metastases with incomplete posterior wall.

The spine is the most common site of bone metastases. Massive pain, spinal cord compression and neurological dysfunction are common manifestations of spine metastases, negatively impacting the patients' quality of life. Previously, treatment options for spinal metastases, including radiotherapy and surgical treatment, were based primarily on prognostic scores such as Tomita or Tokuhashi. We now have a better understanding of which factors influence survival and quality of life after surgery, and several new techniques have been developed over the past decade to make surgery for spinal metastases safer and more acceptable to patients by decreasing postoperative pain and length of hospital stay. Especially, stereotactic body radiation therapy, minimally invasive techniques and targeted therapy have revolutionized the management of metastatic spine tumors.