Question

Colorectal cancer is one of the most preventable forms of cancer. Colonoscopies after age 50 are recommended. This is because:

	a.	Cancer in the colon typically only occurs in individuals with a predisposition to cancer since it is an inherited disease
	b.	Colon cancer does not metastasize typically so when it is detected it can be removed
	c.	Cancer is a multi-step process and only the late stages of cancer are detectable, such as polyps resulting from mutations in APC
	d.	Cancer is a multi-step process and early steps in the progression to cancer such as mutations in APC can be detected as polyps and removed

Answer 1

Colorectal cancer is one of the most preventable forms of cancer. Colonoscopies after age 50 are recommended. This is because colon cancer risk increases with age, and more than 90% of cases occur in people ages 50 and over.Colorectal cancer may occurs due to mutation in APC gene .Most colorectal cancers arises from adenomatous polyps. A colonoscopy allows clinicians to remove polyps before they become cancerous and to identify cancer itself early, when it's most treatable.

So correct option is (d). All other options are not correct according to the given explanation.