Sarcomas are cancers of connective tissue. They are divided into groups based on if they arise in soft tissue or bone.
- Soft tissue sarcomas are more common and mostly occur in the elderly. They can originate from cells of muscle, fat, nerve, or blood vessels. However, in most cases, the cell of origin is unknown. Soft tissue sarcomas most frequently are found in the muscles of the thigh, but can occur anywhere in the body.
- Bone sarcomas more commonly occur in adolescents and young adults. The most common types are osteosarcoma and Ewing sarcoma. Osteosarcoma, a cancer of the part of the bone that gives bone its strength, is found most often in the bones around the knee. Ewing sarcoma most often occurs in the bones of the pelvis or the middle of long bones, but can also presents in the muscles.
These tumors are different from other “cancers of the bone,” such as breast cancer which spreads to bone or multiple myeloma which arises from blood cells in the bone marrow.
- Sarcomas account for about 1 percent of adult cancers and about 15 percent of childhood cancers.
- In the U.S., about 12,310 new cases of soft tissue sarcoma are expected in 2016, resulting in approximately 4,990 deaths.
- There are approximately 3,300 new cases of bone and joint cancer in the U.S. every year.
Of the new cases of bone sarcoma, about half occur in children and teenagers.
There are no concrete reasons for developing sarcomas, but certain risk factors have been identified based on common characteristics in individuals who developed the disease, including:
- High doses of radiation exposure from treatments for other cancers; however, radiation treatment techniques have improved to ensure the targeted area is treated more precisely so effects on surrounding tissues and organs are minimized.
- Individuals exposed to herbicides with phenoxyacetic acid and wood preservatives with chlorophenols have a higher risk.
- Individuals with certain inherited diseases, including Li-Fraumeni syndrome, Rothmund-Thomson syndrome, retinoblastoma, Gardner syndrome, Werner syndrome, Gorlin syndrome, von Recklinghausen disease, or tuberous sclerosis have an increased risk of developing a soft-tissue or bone sarcoma.
- Damage to a person’s lymph system, through surgery or radiation therapy, is a risk factor for soft-tissue sarcoma.
Signs and Symptoms
In the early stages, it can be difficult to determine if a sarcoma is present and can go undetected for a long period of time. Suspicious lumps or swollen areas of the body should be evaluated by a physician, who may conduct a biopsy to determine if the lump is a malignant tumor or benign. Over time, tumors will grow, become sore and eventually cause pain, swelling, numbness, tingling, or weakness because the tumor presses against nerves or muscles.
Tips for Prevention
There are no known ways to prevent the development of a bone or soft-tissue sarcoma. Maintaining a healthy lifestyle and getting regular check-ups are the best ways to reduce the risk for developing all forms of cancer.
Once a sarcoma is diagnosed, the treatment plan will be based on type, location, stage, and the patient’s overall health. Depending on the cancer’s location, as well as its stage of development, surgery is an option for treatment. For a soft-tissue sarcoma, tissue in distant sites is sometimes removed if the disease has spread to other areas. Chemotherapy or radiation therapy may also be used to shrink the tumor before surgery. Following the surgery, patients may need radiation therapy or chemotherapy to improve the chances of eliminating all tumor cells.
Source: American Cancer Society, American Society of Clinical Oncology, Sarcoma Foundation of America