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Association Between Fecal Calprotectin Levels and Small-bowel Inflammation Score in Capsule Endoscopy: A Multicenter Retrospective Study

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Abstract

Background

Accurate inflammation reporting in capsule endoscopy (CE) is important for diagnosis and monitoring of treatment of inflammatory bowel disease (IBD). Fecal calprotectin (FC) is a highly specific biomarker of gut inflammation. Lewis score (LS) was developed to standardize quantification of inflammation in small-bowel (SB) CE images.

Goals

Multicenter retrospective study aiming to investigate correlation between LS and FC in a large group of patients undergoing CE for suspected or known small-bowel IBD, and to develop a model for prediction of CE results (LS) based on FC levels.

Study

Five academic centers and a district general hospital offering CE in UK, Finland, Sweden, Canada, and Israel. In total, 333 patients were recruited. They had small-bowel CE and FC done within 3 months.

Results

Overall, correlation between FC and LS was weak (r s: 0.232, P < 0.001). When two clinically significant FC thresholds (100 and 250 μg/g) were examined, the r s between FC and LS was 0.247 (weak) and 0.337 (moderate), respectively (P = 0.307). For clinically significant (LS ≥ 135) or negative (LS < 135) for SB inflammation, ROC curves gave an optimum cutoff point of FC 76 μg/g with sensitivity 0.59 and specificity 0.41. Limitations: Retrospective design.

Conclusions

LS appears to show low correlation with FC as well as other serology markers of inflammation. FC does not appear to be a reliable biomarker for significant small-bowel inflammation. Nevertheless, FC level ≥ 76 μg/g may be associated with appreciable visual inflammation on small-bowel CE in patients with negative prior diagnostic workup.

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Acknowledgments

The authors thank Pirkko Tuukkala and Virpi Pelkonen (both with Helsinki University Central Hospital, Finland) for their invaluable help with the data collection.

Authors’ contributions

All authors contributed to data collection. Dr. A Koulaouzidis created the first draft. All authors critically reviewed the document and provided changes. All authors approved the final version of the article, including the authorship list.

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Correspondence to Diana E. Yung.

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Conflict of interest

Dr. Koulaouzidis received an Given Imaging Ltd/ESGE Ltd research Grant in 2011. He has also accepted material support for research from SynMedUK Ltd. Dr. Seidman has received in-kind research support from Given Imaging/Medtronic Inc., 2011–2015. Rami Eliakim received consultation fees from Given Imaging. The rest of the authors have no disclosure to make.

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Clinical Audit Department at the Royal Infirmary of Edinburgh.

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Koulaouzidis, A., Sipponen, T., Nemeth, A. et al. Association Between Fecal Calprotectin Levels and Small-bowel Inflammation Score in Capsule Endoscopy: A Multicenter Retrospective Study. Dig Dis Sci 61, 2033–2040 (2016). https://doi.org/10.1007/s10620-016-4104-7

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