This project has for objective to demonstrate that the increase of the distance "Patient home - center of treatment" may be associated with significant, other noticeable, noted events. This distance may also be available in the Rouen University Hospital. The study of the association in this distance and the delay in initiating chemotherapy after surgery in patients treated at the CHU correspond to a pilot study prior to the completion of the analysis at the regional scale.

Inclusion Criteria:

- Patients who had colectomy for colon cancer and at least one chemotherapy treatment at CHU Rouen, between 2009 and the first half of 2015.

Exclusion Criteria:

• Patients who died in hospital before receiving a chemotherapy treatment
• Patients with a CIM code of metastasis during the stay of the colectomy or the first chemotherapy treatment
• Patients who received a chemotherapy treatment before colectomy
• Patients who have undergone several colectomies.

Patient having a cancer colon and hospitalized for colectomy: malignant tumor colon, in situ colon carcinoma or tumor with unpredictable or unknown evolution of the colon