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A Bayesian Prevalence-Incidence Mixture Model for Screening Outcomes With Misclassification.

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This study introduces a new statistical model to accurately estimate adenoma incidence from colorectal cancer (CRC) screening data. The model addresses challenges like interval-censored data and potential missed diagnoses, improving surveillance accuracy.

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Area of Science:

  • Epidemiology
  • Biostatistics
  • Medical Informatics

Background:

  • Colorectal cancer (CRC) surveillance relies on electronic health records (EHR) from screening programs.
  • Individuals with a family history of CRC undergo regular colonoscopies to detect precursor adenomas.
  • Existing EHR data present challenges including interval-censored event times and potential adenoma underdetection.

Purpose of the Study:

  • To develop a novel statistical model for estimating time to adenoma incidence in CRC surveillance.
  • To address interval-censoring, misclassification due to missed adenomas, and unobserved prevalent cases in EHR data.
  • To explore associations between adenoma incidence and relevant covariates.

Main Methods:

  • Development of a new prevalence-incidence mixture model (PIM).
  • Utilized a Bayesian estimation approach with data augmentation and regularization priors.
  • Implementation in the R package BayesPIM for practical application.

Main Results:

  • The PIM model effectively handles interval-censored data and misclassification inherent in screening EHR.
  • Demonstrated good model performance in simulations, particularly with informative priors on test sensitivity.
  • Provided methods for fitting the model, estimating cumulative incidence, and evaluating model fit.

Conclusions:

  • The developed PIM model offers a robust solution for analyzing CRC surveillance data.
  • Accurate estimation of adenoma incidence is crucial for effective cancer prevention strategies.
  • The BayesPIM R package facilitates the application of this advanced statistical methodology.