From all my reading i would disagree with that Dr. as it appears most colon cancer as well as most other cancers acquired the genetic mutations during ones life most likely from their lifestyle. And heredity seems to make up a small %.
"Most gene mutations that lead to cancer are
acquired mutations. They happen during a person’s lifetime and are not passed on to their children. These DNA changes affect only cells that come from the original mutated cell.
In most cases of colorectal cancer, the DNA mutations that lead to cancer are acquired during a person’s life rather than having been inherited. Certain
risk factors probably play a role in causing these acquired mutations, but so far it’s not known what causes most of them."
Learn about possible causes of colorectal cancer, such as inherited syndromes that run in families and acquired gene mutations that happen over a person’s lifetime.
www.cancer.org