Abstract
Background
Survival in pancreatic ductal adenocarcinoma (PDAC) remains poor due to late diagnosis. Electronic Health Records (EHRs) can be used to study this rare disease, but validated algorithms to identify PDAC in the United States EHRs do not currently exist.
Aims
To develop and validate an algorithm using Veterans Health Administration (VHA) EHR data for the identification of patients with PDAC.
Methods
We developed two algorithms to identify patients with PDAC in the VHA from 2002 to 2023. The algorithms required diagnosis of exocrine pancreatic cancer in either ≥ 1 or ≥ 2 of the following domains: (i) the VA national cancer registry, (ii) an inpatient encounter, or (iii) an outpatient encounter in an oncology setting. Among individuals identified with ≥ 1 of the above criteria, a random sample of 100 were reviewed by three gastroenterologists to adjudicate PDAC status. We also adjudicated fifty patients not qualifying for either algorithm. These patients died as inpatients and had alkaline phosphatase values within the interquartile range of patients who met ≥ 2 of the above criteria for PDAC. These expert adjudications allowed us to calculate the positive and negative predictive value of the algorithms.
Results
Of 10.8 million individuals, 25,533 met ≥ 1 criteria (PPV 83.0%, kappa statistic 0.93) and 13,693 individuals met ≥ 2 criteria (PPV 95.2%, kappa statistic 1.00). The NPV for PDAC was 100%.
Conclusions
An algorithm incorporating readily available EHR data elements to identify patients with PDAC achieved excellent PPV and NPV. This algorithm is likely to enable future epidemiologic studies of PDAC.
Graphic Abstract
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Abbreviations
- PDAC:
-
Pancreatic ductal adenocarcinoma
- EHR:
-
Electronic health record
- SEER:
-
Surveillance, epidemiology, and end results
- VHA:
-
Veterans health administration
- VACCR:
-
Veterans affairs central cancer registry
- ICD:
-
International classification of disease
- REDCap:
-
Research electronic data capture
- IPMN:
-
Intraductal papillary mucinous neoplasm
- UHDDS:
-
Uniform hospital discharge dataset
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Funding
This research was supposed by a VHA CS&RD CDA-2 IK2BX005891-01 and by an NIH T32 training grant T32DK007356.
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CM: data collection, writing—original draft, writing—review & editing. NRL: data curation, formal analysis, and visualization. MS: methodology. LP: methodology and supervision. CB: conceptualization, methodology, writing—review & editing, and supervision. RGH: methodology and data curation. AJ: conceptualization, methodology, writing—review & editing, and supervision. YXY: conceptualization, methodology, data curation, writing—review & editing, and supervision. LW: conceptualization, methodology, data collection, data curation, writing—review & editing, supervision, and project administration.
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Mezzacappa, C., Larki, N.R., Skanderson, M. et al. Development and Validation of Case-Finding Algorithms to Identify Pancreatic Cancer in the Veterans Health Administration. Dig Dis Sci 69, 1507–1513 (2024). https://doi.org/10.1007/s10620-024-08324-w
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DOI: https://doi.org/10.1007/s10620-024-08324-w