BACKGROUND & AIMS: Colonoscopy is used widely for colorectal cancer (CRC) screening; however, its long-term impact on the incidence and mortality of CRC is not known. METHODS: We assessed CRC incidence and mortality in a group of asymptomatic average-risk patients who underwent screening colonoscopy between 1989 and 1993 at a university hospital. By using standardized incidence ratios and standardized mortality ratios, we compared our observed CRC rates with expected rates from the Surveillance, Epidemiology, and End Results (SEER) data. RESULTS: The cohort comprised 715 patients (mean age, 61 +/- 6.5 y; 59% male; 95% Caucasian) with 10,492 patient-years of follow-up. There were 12 cases of CRC: 5 found at baseline and 7 found after a median follow-up period of 8 years (range, 3-16 y). When the first 2 years of follow-up were excluded, there were 7 incident cases of CRC (95% confidence interval [CI], 2-13) over 9075 person-years of follow-up. The expected number based on SEER data was 21. The incidence rate was 0.77 cases per 1000 person-years, and the standardized incidence ratio was 0.33 (95% CI, 0.10-0.62), consistent with a relative risk reduction in CRC incidence of 67%. Three patients died from CRC (95% CI, 0-9). The expected number of deaths based on SEER data was 9. The mortality rate was 0.29 per 1000 person-years, and the standardized mortality ratio was 0.35 (95% CI, 0.0-1.06), consistent with a relative reduction in CRC death of 65%. CONCLUSIONS: In this average-risk cohort, CRC incidence and mortality were reduced after screening colonoscopy. These results provide additional evidence for the effectiveness of colonoscopy as a primary CRC screening modality.
BACKGROUND & AIMS: Colonoscopy is used widely for colorectal cancer (CRC) screening; however, its long-term impact on the incidence and mortality of CRC is not known. METHODS: We assessed CRC incidence and mortality in a group of asymptomatic average-risk patients who underwent screening colonoscopy between 1989 and 1993 at a university hospital. By using standardized incidence ratios and standardized mortality ratios, we compared our observed CRC rates with expected rates from the Surveillance, Epidemiology, and End Results (SEER) data. RESULTS: The cohort comprised 715 patients (mean age, 61 +/- 6.5 y; 59% male; 95% Caucasian) with 10,492 patient-years of follow-up. There were 12 cases of CRC: 5 found at baseline and 7 found after a median follow-up period of 8 years (range, 3-16 y). When the first 2 years of follow-up were excluded, there were 7 incident cases of CRC (95% confidence interval [CI], 2-13) over 9075 person-years of follow-up. The expected number based on SEER data was 21. The incidence rate was 0.77 cases per 1000 person-years, and the standardized incidence ratio was 0.33 (95% CI, 0.10-0.62), consistent with a relative risk reduction in CRC incidence of 67%. Three patients died from CRC (95% CI, 0-9). The expected number of deaths based on SEER data was 9. The mortality rate was 0.29 per 1000 person-years, and the standardized mortality ratio was 0.35 (95% CI, 0.0-1.06), consistent with a relative reduction in CRC death of 65%. CONCLUSIONS: In this average-risk cohort, CRC incidence and mortality were reduced after screening colonoscopy. These results provide additional evidence for the effectiveness of colonoscopy as a primary CRC screening modality.
Authors: Nancy N Baxter; Joan L Warren; Michael J Barrett; Therese A Stukel; V Paul Doria-Rose Journal: J Clin Oncol Date: 2012-06-11 Impact factor: 44.544
Authors: M F Kaminski; M Bretthauer; A G Zauber; E J Kuipers; H-O Adami; M van Ballegooijen; J Regula; M van Leerdam; T Stefansson; L Påhlman; E Dekker; M A Hernán; K Garborg; G Hoff Journal: Endoscopy Date: 2012-06-21 Impact factor: 10.093
Authors: Michael Sai Lai Sey; Jamie Gregor; Paul Adams; Nitin Khanna; Chris Vinden; David Driman; Nilesh Chande Journal: Can J Gastroenterol Date: 2012-12 Impact factor: 3.522