I’ve cut and pasted some info here which may be of interest.
Synovial sarcoma refers to a rare soft tissue sarcoma, or cancer, that occurs mainly in young adults. Generally, soft tissue sarcomas occur in muscles, fibrous tissue, and fat. Synovial tissue is the tissue that lines joint cavities such as the elbow, knee, and tendons. Typically, synovial sarcoma is rare and occurs more often in males than in females.
Treatment usually involves:
1) Surgery, to remove the tumor and a safety margin of healthy tissue. This is the mainstay of synovial sarcoma treatment.
2) Conventional chemotherapy to reduce the number of remaining microscopic cancer cells.
3) Radiotherapy to reduce the chance of local recurrence. The benefit of radiotherapy in this disease is less clear than for chemotherapy.