Soft Tissue Sarcoma: Stages

What does the stage of a cancer mean?

The stage of a cancer is how much and how far the cancer has spread in your body. Your healthcare provider uses exams and tests to find out the size of the cancer and where it is. He or she can also see if the cancer has spread to nearby areas, and if it has spread to other parts of your body. The stage of a cancer is one of the most important things to know when deciding how to treat the cancer.

The TNM system for staging soft tissue sarcoma

Soft tissue sarcomas are usually staged with the TNM staging system from the American Joint Committee of Cancer (AJCC). Be sure to ask your healthcare provider to explain the stage of your cancer to you in a way you can understand.

The first step in staging is to find the value for each part of the TNM system. Here's what the letters stand for in the TNM system:

• T describes the size of the main tumor.

• N describes whether or not the cancer has spread to nearby lymph nodes.

• M denotes if the cancer has spread (metastasized) to distant parts of the body.

Numbers or letters after T, N, and M provide more details about each of these factors. There are also two other values that can be assigned:

• X means the provider does not have enough information to tell the extent of the main tumor (TX), or if the lymph nodes have cancer cells in them (NX).

• 0 means no sign of cancer, such as no sign of lymph node spread (N0).

Grade

Grade is another key part of staging these cancers.

• G is the grade of the cancer. This is a measure on a scale of one to three (G1, G2, and G3) of how quickly the cancer is likely to grow and spread. It’s based on how the cancer cells look under the microscope. Higher grade cancers are more likely to grow and spread quickly.

The letter X may be used when the grade isn't known (GX).

Stage grouping

These four factors, T, N, M, and G, are combined to give an overall description of your cancer and an overall stage grouping.

A stage grouping is listed as a Roman numeral and can have a value of I through IV (1 to 4 ).The higher the number, the more advanced the cancer is. Letters and numbers can be used after the Roman numeral to give more details.

What are the stages of soft tissue sarcoma?

Soft tissue sarcomas start in cells that make up parts of the body like muscle, nerves, fat, vessels, and fibrous tissue. As the cancer grows, it can spread into nearby tissuess and vessels. Then, like all cancers, it can spread (metastasize) to other parts of the body. That's why you might hear cancer that has spread being called metastatic cancer.

The stages of soft tissue sarcoma depend on where the cancer is. There are two main groups: cancers that start in the trunk and limbs and cancers that start in the back of the abdomen (belly) in an area called the retroperitoneum. Both are covered here.

Trunk and limb sarcomas

 These are the stage groupings for soft tissue sarcomas that start in the trunk and limbs and what they mean:

 Stage IA. The main tumor is 5 centimeters (cm) across or less. It has not spread to nearby lymph nodes or to other parts of the body. It’s either low grade (G1) or (GX).

 Stage IB. The main tumor is more than 5 cm across. It has not spread to nearby lymph nodes or to other parts of the body. It’s either G1 or GX.

 Stage II. The main tumor is 5 cm across or less. It has not spread to nearby lymph nodes or to other parts of the body. It’s a higher grade (G2 or G3).

 Stage IIIA. The main tumor is 5 to 10 cm across. It has not spread to nearby lymph nodes or to other parts of the body. It's either G2 or G3.

 Stage IIIB. The main tumor is more than 10 cm across. It has not spread to nearby lymph nodes or to other parts of the body. It's either G2 or G3.

 Stage IV. The tumor is any size and has spread to nearby lymph nodes. It has not spread to other parts of the body. It can be any grade.

 Stage IV. The tumor is any size and has spread to nearby lymph nodes. It has also spread to other parts of the body, like the lungs. It can be any grade.

 Retroperitoneal sarcomas

 These are the stage groupings for soft tissue sarcomas that start in the the back of the belly (the retroperitoneum) and what they mean:

 Stage IA. The main tumor is 5 centimeters (cm) across or less. It has not spread to nearby lymph nodes or to other parts of the body. It’s either low grade (G1) or the grade isn’t known (GX).

 Stage IB. The main tumor is more than 5 cm across. It has not spread to nearby lymph nodes or to other parts of the body. It’s either G1 or GX.

 Stage II. The main tumor is 5 cm across or less. It has not spread to nearby lymph nodes or to other parts of the body. It’s a higher grade (G2 or G3).

 Stage IIIA. The main tumor is 5 to 10 cm across. It has not spread to nearby lymph nodes or to other parts of the body. It's either G2 or G3.

 Stage IIIB. This stage is either of these:

• The main tumor is more than 10 cm across. It has not spread to nearby lymph nodes or to other parts of the body. It's either G2 or G3.

• The tumor is any size and has spread to nearby lymph nodes. It has not spread to other parts of the body. It can be any grade.

Stage IV. The tumor is any size and has spread to nearby lymph nodes. It has also spread to other parts of the body, like the lungs. It can be any grade.

Talking with your healthcare provider

Once your cancer is staged,  talk with your healthcare provider about what the stage means for you. Make sure to ask questions and talk about your concerns.