Soft tissue sarcoma (STS) is cancer that forms in the soft tissue of the body. Soft tissue connects, supports, or surrounds other body parts. In adults, STS is rare.
There are many different types of soft tissue cancers. The type of sarcoma depends on the tissue it forms in:
- Blood vessels
- Lymph vessels
- Tissues in and around joints
The cancer can form almost anywhere, but is most common in the:
STS; Leiomyosarcoma; Hemangiosarcoma; Kaposi's sarcoma; Lymphangiosarcoma; Synovial sarcoma; Neurofibrosarcoma; Liposarcoma; Fibrosarcoma; Malignant fibrous histiocytoma; Dermatofibrosarcoma; Angiosarcoma
It is not known what causes most sarcomas. But there are certain risk factors:
In early stages, there are often no symptoms. As the cancer grows, it may cause a lump or swelling that keeps growing over time. Most lumps are not due to cancer.
Other symptoms include:
- Pain, if it presses on a nerve, organ, blood vessel, or muscle
- Blockage or bleeding in the stomach or intestines
- Breathing problems
Exams and Tests
Your health care provider will ask you about your medical history and do a physical exam. Other tests may include:
If your provider suspects cancer, you might have a biopsy to check for cancer. In a biopsy, your provider collects a tissue sample to examine in the lab.
The biopsy will show if cancer is present and help show how quickly it is growing. Your provider may ask for more tests to stage the cancer. Staging can tell how much cancer is present and whether it has spread.
Surgery is the most common treatment for STS.
- In early stages, the tumor and some healthy tissue around it is removed.
- Sometimes, just a small amount of tissue needs to be removed. Other times, a wider area of tissue must be removed.
- With advanced cancers that form in an arm or leg, surgery may be followed by radiation or chemotherapy. Rarely, the limb may need to be amputated.
- Used before surgery to help shrink the tumor to make it easier to remove the cancer
- Used after surgery to kill any remaining cancer cells
Chemotherapy may be used to help kill cancer that has metastasized. This means it has spread to different areas of the body.
Cancer affects how you feel about yourself and your life. You can ease the stress of illness by joining a cancer support group. Sharing with others who have had the same experiences and problems can help you feel less alone.
Ask your provider to help you find a support group for people who have been diagnosed with STS.
The outlook for people whose cancer is treated early is very good. Most people who survive 5 years can expect to be cancer-free at 10 years.
Complications include side effects from surgery, chemotherapy, or radiation.
When to Contact a Medical Professional
See your provider about any lump that grows in size or is painful.
The cause of most STSs isn't known and there is no way to prevent it. Knowing your risk factors and telling your provider when you first notice symptoms can increase your chance of surviving this type of cancer.
Contreras CM, Heslin MJ. Soft tissue sarcoma. In: Townsend CM Jr, Beauchamp RD, Evers BM, Mattox KL, eds. Sabiston Textbook of Surgery. 21st ed. St Louis, MO: Elsevier; 2022:chap 32.
National Cancer Institute website. Adult soft tissue sarcoma treatment (PDQ) - health professional version. www.cancer.gov/types/soft-tissue-sarcoma/hp/adult-soft-tissue-treatment-pdq#section/all. Updated December 16, 2022. Accessed February 14, 2023.
Van Tine BA. Sarcomas of soft tissue. In: Niederhuber JE, Armitage JO, Kastan MB, Doroshow JH, Tepper JE, eds. Abeloff's Clinical Oncology. 6th ed. Philadelphia, PA: Elsevier; 2020:chap 90.