Radiation therapy secondary malignancies from

Benign tnmonrs are nsnally only a problem when they impair the fnnction of organs or canse metabolic stress. They can be removed by snrgery or radiation therapy. Malignant tnmonrs are mnch more of a problem, since the cells can escape from the primary tnmonr to other sites in the body, where they settle and develop into secondary tumours (metastases). Then, chemotherapy is the only treatment available. The process is known as metastasis. 

---