TY - JOUR

T1 - A Validated Register-Based Algorithm to Identify Patients Diagnosed with Recurrence of Surgically Treated Stage I Lung Cancer in Denmark

AU - Rasmussen, Linda Aagaard

AU - Christensen, Niels Lyhne

AU - Winther-Larsen, Anne

AU - Dalton, Susanne Oksbjerg

AU - Virgilsen, Line Flytkjær

AU - Jensen, Henry

AU - Vedsted, Peter

N1 - Publisher Copyright: © 2023 Rasmussen et al.

PY - 2023

Y1 - 2023

N2 - Introduction: Recurrence of cancer is not routinely registered in Danish national health registers. This study aimed to develop and validate a register-based algorithm to identify patients diagnosed with recurrent lung cancer and to estimate the accuracy of the identified diagnosis date. Material and Methods: Patients with early-stage lung cancer treated with surgery were included in the study. Recurrence indicators were diagnosis and procedure codes recorded in the Danish National Patient Register and pathology results recorded in the Danish National Pathology Register. Information from CT scans and medical records served as the gold standard to assess the accuracy of the algorithm. Results: The final population consisted of 217 patients; 72 (33%) had recurrence according to the gold standard. The median follow-up time since primary lung cancer diagnosis was 29 months (interquartile interval: 18–46). The algorithm for identifying a recurrence reached a sensitivity of 83.3% (95% CI: 72.7–91.1), a specificity of 93.8% (95% CI: 88.5–97.1), and a positive predictive value of 87.0% (95% CI: 76.7–93.9). The algorithm identified 70% of the recurrences within 60 days of the recurrence date registered by the gold standard method. The positive predictive value of the algorithm decreased to 70% when the algorithm was simulated in a population with a recurrence rate of 15%. Conclusion: The proposed algorithm demonstrated good performance in a population with 33% recurrences over a median of 29 months. It can be used to identify patients diagnosed with recurrent lung cancer, and it may be a valuable tool for future research in this field. However, a lower positive predictive value is seen when applying the algorithm in populations with low recurrence rates.

AB - Introduction: Recurrence of cancer is not routinely registered in Danish national health registers. This study aimed to develop and validate a register-based algorithm to identify patients diagnosed with recurrent lung cancer and to estimate the accuracy of the identified diagnosis date. Material and Methods: Patients with early-stage lung cancer treated with surgery were included in the study. Recurrence indicators were diagnosis and procedure codes recorded in the Danish National Patient Register and pathology results recorded in the Danish National Pathology Register. Information from CT scans and medical records served as the gold standard to assess the accuracy of the algorithm. Results: The final population consisted of 217 patients; 72 (33%) had recurrence according to the gold standard. The median follow-up time since primary lung cancer diagnosis was 29 months (interquartile interval: 18–46). The algorithm for identifying a recurrence reached a sensitivity of 83.3% (95% CI: 72.7–91.1), a specificity of 93.8% (95% CI: 88.5–97.1), and a positive predictive value of 87.0% (95% CI: 76.7–93.9). The algorithm identified 70% of the recurrences within 60 days of the recurrence date registered by the gold standard method. The positive predictive value of the algorithm decreased to 70% when the algorithm was simulated in a population with a recurrence rate of 15%. Conclusion: The proposed algorithm demonstrated good performance in a population with 33% recurrences over a median of 29 months. It can be used to identify patients diagnosed with recurrent lung cancer, and it may be a valuable tool for future research in this field. However, a lower positive predictive value is seen when applying the algorithm in populations with low recurrence rates.

KW - algorithms

KW - Denmark

KW - lung neoplasms

KW - recurrence

KW - registries

KW - validation study

U2 - 10.2147/CLEP.S396738

DO - 10.2147/CLEP.S396738

M3 - Journal article

C2 - 36890800

AN - SCOPUS:85149645758

VL - 15

SP - 251

EP - 261

JO - Clinical Epidemiology

JF - Clinical Epidemiology

SN - 1179-1349

ER -