Results: 2

1.
Figure 2

Figure 2. Cumulative Mortality from Colorectal Cancer in the General Population, as Compared with the Adenoma and Nonadenoma Cohorts. From: Colonoscopic Polypectomy and Long-Term Prevention of Colorectal-Cancer Deaths.

We censored the curves at 20 years; the 12th death in the adenoma cohort was at 22 years and was included in the analysis. The numbers of deaths from colorectal cancer are given at the end of the curves for the general population (25.4 expected deaths) and the adenoma cohort (12 observed deaths). Expected deaths are based on data from Surveillance, Epidemiology, and End Results registries in nine areas (SEER9).

Ann G. Zauber, et al. N Engl J Med. ;366(8):687-696.
2.
Figure 1

Figure 1. Study Enrollment. From: Colonoscopic Polypectomy and Long-Term Prevention of Colorectal-Cancer Deaths.

Of the 9112 patients referred for this study, 2602 with adenomatous polyps and 773 with only nonadenomatous polyps were included in the analysis. Diagnosis was made according to pathological classification at the clinical center. Only patients who provided sufficient demographic information (at least first and last names and either Social Security number or the month and year of birth) were matched against data from the National Death Index. These identifiers were not retained for patients with no polyps or with gross cancer; consequently, none of these patients were included in the analysis of mortality. In addition, 30 patients with adenomas and 3 with nonadenomas did not have sufficient demographic information and were not included in the analysis.

Ann G. Zauber, et al. N Engl J Med. ;366(8):687-696.

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