Everyone who has colorectal cancer diagnosed should be tested for an inherited genetic condition called Lynch syndrome, new guidance states | BMJ
The National Institute for Health and Care Excellence (NICE) recommends microsatellite instability testing or immunohistochemistry to detect abnormalities that may indicate the syndrome.
Lynch syndrome, the most common cause of hereditary bowel cancer, has also been linked to an increased risk of developing other cancers including womb, ovarian, and stomach. People with the condition who develop colorectal cancer generally do so at a younger age, usually 40-50.
Testing for the condition helps to identify whether the patient’s family are also at increased risk of cancer so that they can be monitored more closely if needed, says NICE. Where these tests show that a person has a risk of the syndrome, the guidance recommends further tests to confirm the diagnosis. Because it is an inherited condition, a positive test can also lead to testing of family members.
Diagnosing Lynch syndrome may also help with the choice of treatment for colorectal cancer—for example, to direct chemotherapy or surgery.
Read the full overview here
Read the full guidance recommendations here