Variations in participation to the colorectal cancer screening seems to reveal social and geographical inequalities. Our study will investigate whether patient navigation could increase the participation to the colorectal cancer screening and in the same time, reduce the social inequalities.

Inclusion Criteria:

• Insured people invited to the national french colorectal screening program are from 50 to 74 years old.
• We select people who never do the screening test or are not compliant with it
• Among these people we select those living in the randomized geographical areas.

Exclusion Criteria:

• people who have already done the screening test at the two previous campaigns.
• people who have done a colonoscopy in the previous five years or people with a family history with colorectal cancer and people who are following outside of the screening program.
• people with other severe disease or in incapacity to realize the screening test
• people who have another exclusion criteria to realize the screening test.