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The Impact of Second Primary Malignancies on Head and Neck Cancer Survivors: A Nationwide Cohort Study

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  • Li-Jen Liao
  • Hsu-Wen Chou
  • Chi-Te Wang
  • Chen-Shuan Chung
  • Mei-Shu Lai

Abstract

Background: Head and neck cancer (HNC) is associated with a high rate of developing second primary malignancies(SPMs). But the impact on survival remains poorly understood before. Therefore, we want to estimate the impact of SPMs on HNC survivors. Methods and Findings: Between 1986 and 2008, a total of 9,996 SPMs were recorded for 93,891 patients with an initial diagnosis of HNC by the Taiwan Cancer Registry. Patients were followed with national death registry database to 2011.Using the Kaplan–Meier method, a time-dependent covariate was employed to compare the survival rates between patients with and without SPMs. A Cox proportional hazards model that treated age and sex as confounders was used to examine the hazard ratios of SPMs. The relative survival rates were calculated using age- and sex-specific life tables for the population. Parametric mixture cure fraction models were then employed to estimate the percentage of cancer survivors who would be cured. Use of the Kaplan–Meier method showed that the crude survival rates differed significantly for patients with and patients without SPMs (log-rank test

Suggested Citation

  • Li-Jen Liao & Hsu-Wen Chou & Chi-Te Wang & Chen-Shuan Chung & Mei-Shu Lai, 2013. "The Impact of Second Primary Malignancies on Head and Neck Cancer Survivors: A Nationwide Cohort Study," PLOS ONE, Public Library of Science, vol. 8(4), pages 1-6, April.
  • Handle: RePEc:plo:pone00:0062116
    DOI: 10.1371/journal.pone.0062116
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    References listed on IDEAS

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    1. Paul C. Lambert, 2007. "Modeling of the cure fraction in survival studies," Stata Journal, StataCorp LP, vol. 7(3), pages 351-375, September.
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