RNF2 Promotes Chondrosarcoma Progression by Regulating Ubiquitination of CBX7 Academic Background Chondrosarcoma (CHS) is a malignant tumor composed of hyaline cartilage matrix and chondrocytes, ranking as the second most common primary bone tumor after osteosarcoma, accounting for 20%-27% of all primary malignant bone tumors. Although the 5-year s...