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Learning About Soft Tissue Sarcomas

Types of soft tissue, including nerves, muscle and connective tissue, lymph vessels, blood vessels, and fat

What is a soft tissue sarcoma?

A soft tissue sarcoma is a growth of abnormal cells in the body's soft tissues. These tissues include the muscles, lymph and blood vessels, nerves, and fat. It can also include cartilage and other connective tissue. When cancer cells are found in the tissue, the tumour is called malignant.

Sarcoma is another name for a malignant soft tissue tumour. Sarcomas can spread to other parts of the body, like the lungs.

What are some common types?

Some common types of soft tissue sarcomas include:

Undifferentiated and unclassified sarcomas.

These tumours are more common in older adults. They often appear in the arms, legs, or pelvis.

Gastrointestinal stromal tumours (GIST).

This cancer forms in the gastrointestinal (GI) tract. It's usually in the stomach or small intestine.


This type of soft tissue tumour is made up of fat cells. It can be found anywhere on the body. It's sometimes found in more than one spot.


These tumours are often found in the muscles in the belly and in the uterus, the stomach, and the small intestine.

Other types of soft tissue tumours may appear on the skin, nerves, belly, and limbs. Examples include Ewing, Kaposi, and epithelioid sarcomas.

What are the symptoms?

You may feel a swelling or lump near the tumour. Or you may feel pain or have trouble breathing if the tumour grows large enough to press against nerves or organs inside your body.

How are they diagnosed?

Your doctor will ask you about your symptoms and past health and will examine you. If your doctor can feel a lump or mass in the soft tissue, or if you have other symptoms, you will get some tests. The tests can find out if it's cancer. They can also help your doctor figure out the best treatment for the tumour.

Your doctor may also find a tumour when taking X-rays or other images for another problem.

  • You may have one or more imaging tests to get a better look at the tumour. These may include:
    • X-rays.
    • Ultrasound.
    • CT scan.
    • MRI scan.
    • PET or other nuclear scan.
  • You may need blood tests and other lab work.
  • You may need a biopsy so that a sample of the tumour can be looked at under a microscope. This sample may also be used to test for biomarkers, which will help with planning treatment.
  • Doctors may also examine other parts of your body to make sure that the tumour hasn't spread.

The doctor may talk to you about what "stage" your cancer is. The stage refers to how large the tumour is and how far it has spread. It also includes the tumour grade, which describes what the cancer cells look like and how likely they are to grow and spread.

These can help the doctor find out what type of treatment you may need. And they may help to find a clinical trial that has treatments for your type of cancer.

How are they treated?

Your doctor will give you a detailed treatment plan. Your plan will depend on the type of cancer you have, how far it has spread, and how quickly it is growing.

You may need surgery to remove cancer from the tissue.

Radiation therapy is often used for soft tissue cancers. It uses high-energy rays, such as X-rays, to destroy cancer cells and shrink tumours in the body. It may be used before, during, or after surgery.

You may have chemotherapy (chemo). Chemo is medicine that destroys cancer cells. For advanced sarcomas, you may also have targeted therapy. It uses medicines that target the cancer cells. And immunotherapy can help your immune system fight the cancer.

What are some other things to think about?

  • Some tumours are aggressive and need treatment right away. But most cancer grows slowly enough that you can take a little time to find out more about your cancer as you decide about treatment.
  • Think about getting a second opinion from another doctor. Before you start major treatment, it's a good idea to check with another doctor about the type of cancer you have and the stage of your cancer. Your doctor can recommend someone for a second opinion.
  • Ask any questions you might have. You can talk to your doctor, nurses, counsellors, and other advisors.
  • Talk to family, friends, and supporters. Get the kinds of help you need.

Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and call your doctor or nurse call line if you are having problems. It's also a good idea to know your test results and keep a list of the medicines you take.

Where can you learn more?

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