Tumor Extracellular Vesicles lncOSLMT Drives Lung Inflammatory Premetastatic Niche Formation in Osteosarcoma via m&lt;sup&gt;6&lt;/sup&gt;A-Dependent hnRNPA2B1/COX-2 Axis. This evidence concerns the gene HNRNPA2B1 and osteosarcoma.