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Number of Adenomas Removed and Colorectal Cancers Prevented in Randomized Trials of Flexible Sigmoidoscopy Screening.

Abstract：

BACKGROUND & AIMS:Screening for colorectal cancer (CRC) with sigmoidoscopy reduces CRC incidence by detecting and removing adenomas. The number needed to screen is a measure of screening efficiency, but is not directly associated with adenoma removal. We propose the following 2 new metrics for quantifying the relationship between adenoma removal and CRC prevented: number of adenomas needed to remove (NNR) and adenoma dwell time avoided (DTA). METHODS:We collected data from 4 randomized trials of sigmoidoscopy screening (1 in the United States and 3 in Europe) to assess NNR and DTA. For each trial, NNR was computed as the number of adenomas removed from subjects in the intervention group, divided by the number of CRCs prevented. DTA was computed similarly but taking into account the timing of adenoma removal. Combined results across trials were assessed using standard meta-analytic techniques. RESULTS:The estimated NNR for the PLCO (Prostate, Lung, Colorectal and Ovarian) trial was 74 (95% confidence interval [CI], 56-110), for the NORCCAP (Norwegian Colorectal Cancer Prevention) trial was 71 (95% CI, 44-174), for the SCORE (Screening for Colon Rectum) trial was 27 (95% CI, 14-135), and for the UKFSST (UK Flexible Sigmoidoscopy Screening Trial) was 36 (95% CI, 28-52). The combined estimate (meta-analysis) of NNR was 52 (95% CI, 36-93) assuming heterogeneity (P for heterogeneity = .014). DTA estimates among trials ranged from 278 to 730 years, with a combined estimate of 500 (95% CI, 344-833) years assuming heterogeneity (P for heterogeneity = .035), or 2 CRC cases prevented per 1000 adenoma dwell years avoided. The combined estimates of NNR and DTA restricted to advanced adenomas were 13 (95% CI, 9-22) and 122 (95% CI, 90-190) years, respectively. CONCLUSIONS:We collected data from 4 randomized trials of sigmoidoscopy screening for CRC to develop metrics of endoscopic efficiency, NNR and DTA, which are directly linked to adenoma detection and removal. They can be used to compare screening among endoscopic modalities and to more precisely measure adenoma to carcinoma transition rates.

journal_name

Gastroenterology

journal_title

Gastroenterology

authors

Pinsky PF,Loberg M,Senore C,Wooldrage K,Atkin W,Bretthauer M,Cross AJ,Hoff G,Holme O,Kalager M,Segnan N,Schoen RE

doi

10.1053/j.gastro.2018.06.040

subject

Has Abstract

pub_date

2018-10-01 00:00:00

pages

1059-1068.e2

issue

eissn

0016-5085

issn

1528-0012

pii

S0016-5085(18)34667-5

journal_volume

155

pub_type

杂志文章,meta分析

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Number of Adenomas Removed and Colorectal Cancers Prevented in Randomized Trials of Flexible Sigmoidoscopy Screening.