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Ongoing colorectal cancer risk despite surveillance colonoscopy: the Polyp Prevention Trial Continued Follow-up Study.

Abstract：

BACKGROUND:Despite regular colonoscopy, interval colorectal cancer (CRC) may occur. Long-term studies examining CRC rates in patients with previous colonoscopy are lacking. OBJECTIVE:We examined the rate of interval CRC in the Polyp Prevention Trial Continued Follow-up Study (PPT-CFS), an observational study of PPT participants that began after the PPT ended. DESIGN:Prospective. SETTING:A national U.S. community-based polyp prevention trial. MAIN OUTCOME MEASUREMENTS:Medical records of patients with CRC were collected, reviewed, and abstracted in a standardized fashion. RESULTS:Among 2079 PPT participants, 1297 (62.4%) agreed to participate in the PPT-CFS. They were followed for a median of 6.2 years after 4.3 years of median follow-up in the main PPT. Nine cases of CRC were diagnosed over 7626 person-years of observation (PYO), for an incidence rate of 1.2/1000 PYO. The ratio of CRCs observed compared with that expected by Surveillance, Epidemiology, and End Results was 0.64 (95% CI, 0.28-1.06). Including all CRCs (N = 22) since the beginning of the PPT, the observed compared with expected rate by Surveillance, Epidemiology, and End Results was 0.74 (95% CI, 0.47-1.05). Of patients in whom CRC developed in the PPT-CFS, 78% had a history of an advanced adenoma compared with only 43% of patients who remained cancer free (P = .04). LIMITATION:A relatively small number of interval cancers were detected. CONCLUSIONS:Despite frequent colonoscopy during the PPT, in the years after the trial, there was a persistent ongoing risk of cancer. Subjects with a history of advanced adenoma are at increased risk of subsequent cancer and should be followed closely with continued surveillance.

journal_name

Gastrointest Endosc

journal_title

Gastrointestinal endoscopy

authors

Leung K,Pinsky P,Laiyemo AO,Lanza E,Schatzkin A,Schoen RE

doi

10.1016/j.gie.2009.05.010

subject

Has Abstract

pub_date

2010-01-01 00:00:00

pages

111-7

issue

1

eissn

0016-5107

issn

1097-6779

pii

S0016-5107(09)01912-9

journal_volume

71

pub_type

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