Osteosarcoma

Osteosarcoma refers to a malignant connective tissue tumor that tumor cells can directly produce tumor bone and bone-like tissue. Its incidence rate ranks first among primary malignant tumors. The malignancy of the tumor is very high, the prognosis is very poor, and lung metastasis can occur within months. The survival rate of 3 to 5 years after amputation is only 5 to 20%. About three-quarters of all osteosarcomas occur in the lower end of the femur and the upper end of the tibia. Other places such as the humerus, the upper end of the femur, the fibula, the spine, and the sacrum can also occur. Most are osteolytic, and a few are osteogenic. Age of onset: It can occur at any age, but most of them are 10 to 25 years old. There are more males. Tumors are mostly at the bony ends and occasionally occur in the backbone or callus.