What is metastatic bowel cancer?

If the cancer in the bowel is not detected and removed at an early stage, part of the tumour can break off from the main bowel tumour and spread, usually via the lymphatic system or bloodstream, to nearby lymph nodes or other parts of the body.

Your cancer may be advanced when it is first diagnosed. Or it may come back some time after you are first treated.

Local spread

If the cancer has broken through the wall of the bowel and cancer cells have spread into surrounding tissues in the abdomen and pelvis, this is known as local spread.

Metastasis (secondary) spread 

If the cancer has spread to another part of the body (for example, the liver or lungs) it is called metastatic cancer or secondary (advanced) cancer.

The liver is second only to the lymph nodes as the most common part of the body for bowel cancer cells to spread to.

The liver is a common site for bowel cancer cells to spread to as the liver receives most of its blood supply from the portal vein (the vein that carries blood from the intestines and spleen to the liver).

If your bowel cancer has spread in this way, you have metastatic bowel cancer in your liver – not liver cancer.

Your treatment is dependent on where the cancer started and therefore the treatment you have must work on bowel cancer and not liver cancer cells.

The next most common part of the body for bowel cancer cells to spread to is the lungs.

Liver, lung & peritoneal metastases

Liver metastases
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Lung metastases
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Peritoneal metastases
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Metastatic Bowel Cancer

Bowel Cancer Australia’s comprehensive resource regarding possible surgery and treatment options for metastatic cancer in the liver, lungs or peritoneum.