What to expect from genomic tumour profiling for bowel cancer

A laboratory tests tissue from a bowel tumour, often using material from a biopsy or operation. The report may describe changes involved in tumour growth, features that affect medicine selection, or findings that suggest an inherited-risk discussion. Not every change has a treatment attached to it.

Your oncologist combines the report with tumour location, stage, pathology, symptoms, previous treatment, and your health. Profiling is not a substitute for scans or a pathology diagnosis, and it does not predict your individual future on its own.

Ask whether stored tissue can be used and whether a fresh sample is needed. Find out what the test is designed to assess, how the report will be explained, and whether it could affect a discussion about targeted medicines or an inherited genetic test. Keep a list of treatments and side effects to share.

At the review appointment, ask which finding matters for your care now. Discuss expected benefits, possible harms, monitoring, and alternatives before making a treatment decision. A report without an actionable finding does not remove standard care options.

Contact your care team urgently for severe abdominal pain, repeated vomiting, a swollen abdomen, inability to pass stool or gas, heavy rectal bleeding, or fainting. These may need prompt assessment and should not be delayed while awaiting profiling.

Ask: Which bowel tumour sample will be tested? Which molecular findings could change treatment? Do I need inherited genetic counselling? What does a result with no treatment match mean? How will the report fit with my scans and pathology? When will we decide next steps?