Sarcoma: what we know about this type of cancer ©Shutterstock Sarcoma is a type of cancer that can develop in either soft tissue or bones. It is essentially a malignant tumor that can affect anyone.

A bone sarcoma is a kind of tumor—a growth of abnormal cells in the bones. When the tumor grows out of control and destroys nearby tissue or spreads to other parts of the body, it's called malignant.