What causes non-rhabdomyosarcoma soft tissue sarcoma (NRSTS)?
A. Most of the time, the cause of an individual patient’s non-rhabdomyosarcoma soft tissue sarcoma (NRSTS) is not known. Certain types of NRSTS are thought to occur at a site where radiation therapy was previously given. Certain types of NRSTS can also develop in children or young adults who have an inherited risk to developing cancer.