A Follow-up Colonoscopy Examination in Patients Who Had Previously Undergone Screening Colonoscopy

A Follow-up Colonoscopy Examination in Patients Who Had Previously Undergone Screening Colonoscopy

• To determine the prevalence of colonic neoplasm in patients who had previously undergone screening colonoscopy
• To determine the optimal time interval for re-screening in average risk individuals
• To determine potential baseline characteristics that predicts adenoma recurrence

Colorectal cancer (CRC) is the second commonest cancer in Hong Kong, and tends to be increasing. Screening for colorectal cancer can reduce the cancer incidence and mortality by detecting early lesions. However, the best interval for a follow up colonoscopy, particularly for those with normal baseline colonoscopy, remains largely unknown.

This study aim to determine the prevalence of colonic neoplasm in average-risk patients who had previously undergone screening colonoscopy and the optimal time interval for re-screening.

Inclusion Criteria:

• Subjects who are previously participated in one of our two screening colonoscopy studies [Sung, Gastroenterol 2003; Leung, AJG 2004]
• Asymptomatic on first screening colonoscopy
• Age>50and <75
• No family history of CRC
• No other colonoscopy except the baseline screening colonoscopy

Exclusion Criteria:

• Subjects who refused consent
• Subjects who are not warrant follow up colonoscopy