Skip to content
My WebMD Sign In, Sign Up

Colorectal Cancer Health Center

Font Size

Colon Cancer Genetic Testing - What Do the Results Mean?

Colon cancer genetic testing is a blood test that looks for the changed (mutated) genes that cause colon cancer. Although most people who get colon cancer do not have one of these mutated genes, having them greatly increases your chance of getting colon cancer.

A positive result means that you may have one of the changed genes that causes FAP or HNPCC. It also means that, without treatment, your chances of getting colon cancer are very high.

Recommended Related to Colorectal Cancer

Rectal Carcinoids

In general, rectal carcinoids smaller than 1 cm can be safely removed by endoscopic excision.[1] Excised specimens should be examined histologically to exclude muscularis invasion.[2,3,4,5] Tumors measuring 1 cm to 2 cm should be investigated by transanal endosonography or magnetic resonance imaging. Absence of muscularis invasion or regional metastases may justify local excision.[1] The outcome from treating a lesion between 1 cm and 2 cm is unclear. The metastatic risk is between 10% and 15%.[6]...

Read the Rectal Carcinoids article > >

If you have a positive result, you will be able to take action that may help you and your family members live longer. This includes starting screening at a younger age and having screening tests more often.

A negative result means that none of these genes were found in your blood sample.

1

WebMD Medical Reference from Healthwise

Last Updated: August 27, 2012
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
Next Article:

Today on WebMD

Colorectal cancer cells
The right diagnosis is the most important factor.
man with a doctor
Our health check will steer you in the right direction.
 
sauteed cherry tomatoes
Fight cancer one plate at a time.
bladder cancer x-ray
Do you know the warning signs?
 
bread
ARTICLE
Colon vs Rectal Cancer
VIDEO
 
New Colorectal Treatments
VIDEO
can lack of sleep affect your immune system
FEATURE
 
Cancer Facts Quiz
QUIZ
Virtual Colonoscopy
VIDEO
 
Picture of the Colon
ANATOMY
Vitamin D
SLIDESHOW
 

WebMD Special Sections