Bone cancer is the result of the unregulated cell growth in bone cells, cartilage or tissue. There are trillions of cells that form our body and which work together for smooth functioning of the body. In , one of the cells does not pay attention to the normal signals that tell cells to grow, stop growing or to die. Bone cancer is a malignant tumor. It develops from the cells of the bone.  Bone cancer is generally classified as primary bone cancer