The results of this study will make it possible, thanks to better understanding of the natural history of colorectal cancer, to define new treatment and surveillance strategies for colorectal cancers resected with curative intent, so as to improve management and thus improve patient survival.

These data will also make it possible to calculate the prevalence of patients who require treatment or surveillance because of their disease.

Inclusion Criteria:

• with adenocarcinoma of the colon or rectum (ICD-O: C18, C19 and C20)
• residing in the département of Côte-d'Or (501,000 inhabitants according to the 1999 census) or Calvados (511, 012 inhabitants) at the moment of diagnosis
• recorded by either Registry between January 1985 and December 2000
• treated by resection with a curative intent.

Exclusion Criteria:

Will be excluded other morphologic tumours and initially metastatic colorectal cancers, anal cancers.

patients with adenocarcinoma of the colon or rectum