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Interval Colorectal Cancer 2006–2015: Novel Observations

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Abstract

Background

Screening for colorectal cancer (CRC) with colonoscopy has been credited for the majority of the decline in mortality over the past 40 years. However, colonoscopy is hampered by frequent interval cancers (ICs) occurring within 36 months after the last examination. Risk factors for IC imply that most misses are amenable to improved colonoscopic techniques. This study had two primary objectives: (1) to determine whether the proportion of persons with ICs has declined in association with improved approaches to the quality of colonoscopy and (2) to determine unrecognized causes for missed diagnoses.

Methods

This is a retrospective, single-center study of persons with CRC having been diagnosed within 6–36 months since the most recent colonoscopy between 2006 and 2015. Participants, ages 50 and 89 years, were evaluated specifically for technical features and findings of the most recent colonoscopy.

Results

Thirty-nine persons met the inclusion criteria for IC. Mean age was 69.3 years, range 50–86 years, women were 58%, races included 95% Caucasian, 2.5% Asian, and 2.5% African-American, and history of a first-degree relative with CRC was 26%. Symptoms led to the interval diagnosis in 83%, including iron-deficient anemia (38%), bleeding (25%), abdominal/pelvic pain (18%), and change in bowel habit (2.5%). Preexisting neoplasia was present in 72%. The CRC was located in the proximal colon in 51%. Late-stage disease was present in 45%. When compared to persons with an initial diagnosis of screen-detected late-onset CRC, differences were noted for older age, more women, more with a family history of CRC, and more with late-stage disease. The ratio of interval cancers to new cancers ranged between 6 and 11.5%. Findings indicating a “difficult examination” were observed in 14 cases (36%) compared to “easy or no difficulty” examinations in 25 (65%) cases. In a biennial analysis of IC rates between 2006 and 2015, the percentage of IC remained stable between 6 and 11.5%.

Conclusions

ICs have been stable constituting 6–11.5% of all CRCs. A “difficult examination” was often associated with IC, may be a risk factor for this problem, and may be an important clue warranting further study.

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Acknowledgments

We thank Dr. Emma Du for assistance with the pathology data, Julie McCauley for expert statistical assistance, Alina So for assistance with preparation of the data, and Karen Wheeler, Kylie Newman, and Clarence E. Sandbakken for research assistance.

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Authors and Affiliations

  1. Division of Gastroenterology, Scripps Clinic Medical Group, La Jolla, USA

    Willamson B. Strum

  2. Division of Gastroenterology, Department of Medicine, University of California San Diego, La Jolla, CA, USA

    C. Richard Boland

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  1. Willamson B. Strum
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Correspondence to C. Richard Boland.

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WBS has none. CRB consults for Ambry Genetics.

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Strum, W.B., Boland, C.R. Interval Colorectal Cancer 2006–2015: Novel Observations. Dig Dis Sci 66, 855–860 (2021). https://doi.org/10.1007/s10620-020-06242-1

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