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Use of multiple imputation to correct for bias in lung cancer incidence trends by histologic subtype

. 2014 Aug;23(8):1546-58. doi: 10.1158/1055-9965.EPI-14-0130. Epub 2014 May 22. Use of multiple imputation to correct for bias in lung cancer incidence trends by histologic subtype

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Use of multiple imputation to correct for bias in lung cancer incidence trends by histologic subtype

Mandi Yu et al. Cancer Epidemiol Biomarkers Prev. 2014 Aug.

. 2014 Aug;23(8):1546-58. doi: 10.1158/1055-9965.EPI-14-0130. Epub 2014 May 22. Affiliations

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Abstract

Background: Over the past several decades, advances in lung cancer research and practice have led to refinements of histologic diagnosis of lung cancer. The differential use and subsequent alterations of nonspecific morphology codes, however, may have caused artifactual fluctuations in the incidence rates for histologic subtypes, thus biasing temporal trends.

Methods: We developed a multiple imputation (MI) method to correct lung cancer incidence for nonspecific histology using data from the Surveillance, Epidemiology, and End Results Program during 1975 to 2010.

Results: For adenocarcinoma in men and squamous in both genders, the change to an increasing trend around 2005, after more than 10 years of decreasing incidence, is apparently an artifact of the changes in histopathology practice and coding system. After imputation, the rates remained decreasing for adenocarcinoma and squamous in men, and became constant for squamous in women.

Conclusions: As molecular features of distinct histologies are increasingly identified by new technologies, accurate histologic distinctions are becoming increasingly relevant to more effective "targeted" therapies, and therefore, are important to track in patients. However, without incorporating the coding changes, the incidence trends estimated for histologic subtypes could be misleading.

Impact: The MI approach provides a valuable tool for bridging the different histology definitions, thus permitting meaningful inferences about the long-term trends of lung cancer by histologic subtype.

©2014 American Association for Cancer Research.

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Conflict of interest statement

The authors do not have any conflicts of interest.

Figures

Figure 1

Percentages of histologically confirmed lung…

Figure 1

Percentages of histologically confirmed lung cancer cases coded as 8010 and 8046, SEER…

Figure 1

Percentages of histologically confirmed lung cancer cases coded as 8010 and 8046, SEER 9, 1975–2010.

Figure 2

Imputed incidence rates by histologic…

Figure 2

Imputed incidence rates by histologic subtype and gender, histologically confirmed cases that were…

Figure 2

Imputed incidence rates by histologic subtype and gender, histologically confirmed cases that were originally coded as 8010 or 8046, SEER 9, 1975–2010.

Figure 3

Observed and imputed incidence rates…

Figure 3

Observed and imputed incidence rates by histologic subtype and gender, histologically confirmed malignant…

Figure 3

Observed and imputed incidence rates by histologic subtype and gender, histologically confirmed malignant cancer cases, SEER 9, 1975–2010.

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