Journal Article

A Methodological Issue in the Analysis of Second-Primary Cancer Incidence in Long-Term Survivors of Childhood Cancers

Yutaka Yasui, Yan Liu, Joseph P. Neglia, Debra L. Friedman, Smita Bhatia, Anna T. Meadows, Lisa R. Diller, Ann C. Mertens, John Whitton and Leslie L. Robison

in American Journal of Epidemiology

Published on behalf of Johns Hopkins Bloomberg School of Public Health

Volume 158, issue 11, pages 1108-1113
Published in print December 2003 | ISSN: 0002-9262
Published online December 2003 | e-ISSN: 1476-6256 | DOI:
A Methodological Issue in the Analysis of Second-Primary Cancer Incidence in Long-Term Survivors of Childhood Cancers

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Survival of childhood cancer patients has increased remarkably in the last several decades due to therapeutic improvements. Associated with this progress is the emerging need to accurately assess/minimize late effects of cancer therapy in long-term survivors. This paper considers a methodological issue in assessing the risk of second-primary malignant neoplasms, a major late effect of concern, using second-primary female breast cancer as an example. In the assessment of second-primary malignant neoplasm risk, attained age is a critical factor that must be taken into account. Even with follow-up of decades, childhood-cancer survivors are still at relatively young ages for developing adult-onset diseases. Attained ages at follow-up, however, modify cancer risk considerably; for example, in the general population, women aged 40 years have about fivefold increased breast cancer risk compared with women aged 30 years. A failure to account for the natural age-associated increase of risk could alter, or even reverse, analytical conclusions. This problem was studied empirically by both descriptive and regression analyses of two major studies of long-term childhood-cancer survivors, the Childhood Cancer Survivor Study (1975–1999) and the Late Effects Study Group (1955–1994). These showed appreciable differences in the analytical results by not accounting for the natural age-associated increase of risk, illustrating a significant impact of this methodological issue on study conclusions.

Keywords: age distribution; age factors; cohort studies; epidemiologic methods; incidence; models, statistical; neoplasms, second primary; proportional hazards models; Abbreviations: CCSS, Childhood Cancer Survivor Study; CI, confidence interval; LESG, Late Effects Study Group; SEER, Surveillance, Epidemiology, and End Results; SMN, second-primary malignant neoplasm.

Journal Article.  3641 words.  Illustrated.

Subjects: Public Health and Epidemiology

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