How does the Ewings sarcoma spread through the body?
Ewing’s sarcoma spreads when tumour cells enter the blood supply and are circulated to other parts of the body where they may form secondary tumours (“metastases”). Chemotherapy is given to kill these circulating tumour cells. The most common sites for secondary tumours are the lungs and other bones. Tumour cells may also spread via the lymphatic system (this is a network of lymph glands around the body). Also, tumours can spread by direct growth of the primary tumour to form “skip metastases”, though these are rare.
