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CT colonography most effective non-invasive screening test for CRC

Fri, 03/12/2021 - 10:13
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CT colonography (CTC) with 10mm threshold most effectively targets advanced neoplasia (AN) preserving detection while decreasing unnecessary colonoscopies, compared with Multi-target stool-DNA (mt-sDNA) and faecal immunochemical tests (FIT).

"CTC performed with a polyp size threshold for colonoscopy referral set at 10 mm represents the most effective and efficient non-invasive screening test for colorectal cancer (CRC) prevention and detection," clarified first author, Dr Perry J Pickhardt from the department of radiology at the University of Wisconsin School of Medicine & Public Health.

Because the relative performance characteristics of available noninvasive tests had not yet been adequately compared, in their paper, ‘PPV and Detection Rate of mt-sDNA, FIT, and CT Colonography for Advanced Neoplasia: A Hierarchical Bayesian Meta-Analysis of the Noninvasive Colorectal Screening Tests’, published in the American Journal of Roentgenology, Pickhardt's team systematically searched PubMed and Google Scholar, including 10 mt-sDNA, 27 CTC, and 88 FIT published screening studies involving 25,132, 33,4932, and 2,355,958 asymptomatic adults, respectively. To determine test-positivity rates (TPR) leading to optical colonoscopy (OC), as well as positive predictive value (PPV) and detection rate (DR) for both AN and CRC, meta-analysis with hierarchical Bayesian modelling was conducted, in accordance with Cochrane Collaboration and PRISMA guidelines.

The results showed that CRC prevention via screen detection of AN was highest with CTC, followed by mt- sDNA, and lowest with FIT due to the differing TPR and PPV, although overlap existed in the 95% CIs when accounting for uncertainty. Compared with mt-sDNA and CTC6, FIT and CTC10 strategies yielded substantially lower colonoscopy resource utilisation, while mt-sDNA performance appeared to be similar to FIT at low positivity thresholds.

Acknowledging that each CRC screening option has relative advantages and disadvantages that should be carefully considered and tailored to the individual, "in the end," the authors concluded, "the 'best' test may be the one that the patient is willing to undergo."

To access this paper, please click here