👉 Osteosarcoma is a type of cancer that occurs in the bone tissue, specifically in the bones. It's usually caused by abnormal growths called tumors, and they can grow very quickly. The cells in these tumors are called osteoblasts, which means "bone-forming cells" - they help build new bone. When these cells start to divide too quickly, they build up a mass of bone that can cause problems with the bones. Osteosarcoma is one type
