Approximately one-third of patients with normal results on their first and second colonoscopies after undergoing curative resection for colorectal cancer undergo subsequent surveillance colonoscopies within two years, which is earlier than recommended by current guidelines, according to research published in the January issue of Clinical Gastroenterology and Hepatology. UTMB’s Dr. Amanpal Singh and colleagues used data from the Surveillance, Epidemiology, and End Results-Medicare linked database for 1992 to 2005 to analyze the timing for the first three colonoscopies after patients underwent curative surgery for colorectal cancer.