Osteosarcoma is the most common type of cancer that develops in bone. Like the osteoblasts in normal bone, the cells that form this cancer make bone matrix. But the bone matrix of an osteosarcoma is not as strong as that of normal bones. Most osteosarcomas occur in children and young adults. Teens are the most commonly affected age group, but osteosarcoma can occur at any age. In children and young adults, osteosarcoma usually develops in areas where the bone is growing quickly, such as near the ends of the long bones.Most tumors develop in the bones around the knee, either in the distal femur (the lower part of the thigh bone) or the proximal tibia
Targeted therapy drugs: Researchers are also studying new medicines that target specific molecules on the cancer cells. These are known as targeted therapies. Some of these are man-made versions of immune system proteins, known as monoclonal antibodies. These antibodies attach to certain proteins on the cancer cell and help to stop the growth or kill the cancer cells. Examples now being studied include antibodies against the insulin-like growth factor receptor 1 (IGF-1R), a protein that may help cancer cells grow.