UK researchers believe they have explained why some families are incredibly vulnerable to bowel cancer.They have found two genes, which are passed from parent to child, that greatly increase the risk of a tumour forming.
The study, published in Nature Genetics, analysed DNA from 20 people with a strong family history.
The findings could be used to develop a test to judge someone's risk of the disease.
One of the people who took part in the study, Joe Wiegand from Hampshire, was diagnosed with bowel cancer when he was 28. Most of his colon had to be removed.
"There's a very strong history of bowel cancer in my family - my dad's mother and sister both had it, my dad was diagnosed with it at 43 and a few cousins have had bowel cancers and brain tumours.
Read More - http://www.bbc.co.uk/news/world-20810849