Fig. 1
From: Better survival in right-sided versus left-sided stage I - III colon cancer patients
Flow chart of patients’ cohort definition. Data from the Surveillance, Epidemiology, and End Results (SEER) Program of the National Cancer Institute in the United States, covering approximately 28 % of cancer cases in the United States were used for the present population-based analysis. Primary cancer site and histology were coded according to criteria in the third edition of the International Classification of Diseases for Oncology (ICD-O-3) and used to identify 246,390 patients with colon cancer diagnosed between 2004 and 2012. The figure shows the selection process leaving 51,937 patients with right-sided and 39,479 patients with left-sided colon cancer for analysis