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Metastatic Colorectal Cancer (mCRC) of the Liver
When colorectal cancer (CRC) has metastasised (spread) to the liver, it can also be referred to as ‘hepatic mCRC’. The liver is the most common site of metastasis in people with CRC; over 50% of people diagnosed with colorectal cancer will develop mCRC to the liver.38,39 This section will discuss how CRC can lead to metastasis, what happens when it spreads to the liver, and how to obtain more information about the various types of treatment available.
How CRC Spreads to the Liver
As the CRC tumour grows, some tumour cells may break away, spreading to other parts of the body through the blood stream or lymph vessels. As these cancerous cells spread to other tissues or organs they may begin to grow and form new, secondary tumours.22 The hepatic portal vein provides a direct blood supply between the colon and the liver; as a result, the liver is the most common site of CRC metastases.39
Regardless of the location of a secondary tumour, it is always named according to its place of origin. When CRC metastasises to the liver, it is regarded as CRC that has spread to the liver, not as liver cancer. As such, it is treated as colorectal cancer.22
Staging of CRC
Staging is the process of determining how far the cancer has spread within the body.40,41 For CRC, the stage is based on how far the cancer has grown into the bowel wall, if it has extended to nearby structures, and if it has reached the lymph nodes or distant organs.41 Staging is important as it helps doctors decide the most appropriate treatment for each patient.40,41 One staging system used by doctors is the tumour-node-metastasis (TNM) system.40
The ‘T’ component can be staged as:
The ‘N’ component can be staged as:40
The ‘M’ component can be staged as:40
There is also a number-based approach for staging tumours, from I–IV. CRC with liver metastases is stage IV.40
Symptoms of mCRC of the Liver
If CRC has spread to the liver, a patient may experience little to no symptoms, or may notice new vague symptoms, including the following:39,42
Testing for mCRC of the Liver
Liver metastases are often detected as part of routine tests and scans given during or following treatment for primary CRC. In some cases, the presence of metastatic cancer may be diagnosed at the same time as primary CRC.43
To test for mCRC of the liver, doctors may order any of the following tests: 43