AI Article Synopsis

  • - mt-sDNA testing is a stool-based method for screening colorectal cancer (CRC), showing that in an initial test, 16% were positive with a positive predictive value (PPV) of 27.3% for cancer or advanced lesions
  • - A study reviewed data from 2758 patients who took a second test after a negative first result, finding a 15% positivity rate and PPV of 0.25% for CRC, 24% for advanced lesions, and 67% for any colorectal growth
  • - The findings indicate that the test's performance was consistent between the first and second screenings, supporting the relevance of conducting a second mt-sDNA test for CRC detection effectiveness

Article Abstract

Background & Aims: Multitarget stool DNA (mt-sDNA) testing is a stool-based screening test for colorectal cancer (CRC). In a single instance of testing, the pivotal Food and Drug Administration-approval study (NCT01397747) found that 16% of mt-sDNA tests were positive, and the positive predictive value (PPV) for CRC or advanced precursor lesions (APL) was 27.3%. We aimed to examine real-world longitudinal performance by determining the test-positive rate and PPV of mt-sDNA on the second round of testing.

Methods: Colonoscopy and pathology reports were reviewed retrospectively for patients with a negative mt-sDNA on the first round of screening and a positive mt-sDNA on the second round. The test-positivity rate and PPV for CRC, APL, and any colorectal neoplasia were calculated for the second mt-sDNA and compared with baseline PPVs from a previously published cohort of patients from our institution who tested positive on the first round of screening.

Results: A total of 2758 patients completed a second test at a median of 3.2 years after the first test. Of these, 422 (15%) had a positive second mt-sDNA. The PPV was 0.25% for CRC, 24% for APL, and 67% for any colorectal neoplasia. There was no significant difference in PPV on the second mt-sDNA test compared with the first round (24% vs 28% for APL; P = .12).

Conclusions: mt-sDNA test positive rate and PPV were similar between the first and second rounds of screening. These observations confirm the utility of a second round of mt-sDNA screening and may inform estimates of mt-sDNA effectiveness for CRC screening.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10323033PMC
http://dx.doi.org/10.1016/j.cgh.2022.12.026DOI Listing

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