Abstract
Background
Longer time to surgery worsens survival in multiple malignancies, including lung, colorectal, and breast cancers, but limited data exist for well-differentiated thyroid cancer. We sought to investigate the impact of time to surgery on overall survival in patients with papillary thyroid cancer.
Methods
In a retrospective cohort study of the National Cancer Database, we used Cox proportional hazard models to investigate overall survival as a function of time between diagnosis and surgery for adults with papillary thyroid cancer, adjusting for demographic, patient, and cancer-related variables. Time to surgery was investigated both as a continuous variable and as intervals of 0–90 days, 90–180 days, and > 180 days. Subgroup analyses were conducted by T stage.
Results
Overall, 103,812 adults with papillary thyroid cancer were included from 2004 to 2016. Median follow-up was 55.2 months (interquartile range 28.4–89.5). Increasing time to surgery was associated with increased mortality: delaying by 91–180 days increased the risk by 30% (adjusted hazard ratio [aHR] 1.30, 95% CI 1.19–1.43) and delaying by over 180 days increased the risk by 94% (aHR 1.94, 95% CI 1.68–2.24). Five-year overall survival was 95.7% for 0–90 days, 93.0% for 91–180 days, and 87.9% for over 180 days. On subgroup analysis, increasing delay was associated with worse overall survival for T1, T2, and T3 tumors, but not T4 tumors.
Conclusions
Increasing time to surgery in papillary thyroid cancer is associated with reduced overall survival. Further research is necessary to assess the impact of surgical delay on disease-specific survival.
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Acknowledgment
The authors would like to thank Roger Davis, ScD, and Aaron Fleishman, MPH, for assistance with designing the biostatistical analysis.
Funding
This work was conducted with support from Harvard Catalyst | The Harvard Clinical and Translational Science Center (National Center for Research Resources and the National Center for Advancing Translational Sciences, National Institutes of Health Award UL1 TR002541) and financial contributions from Harvard University and its affiliated academic health care centers. The content is solely the responsibility of the authors and does not necessarily represent the official views of Harvard Catalyst, Harvard University and its affiliated academic health care centers, or the National Institutes of Health. Dr. Lubitz is also supported by the National Institutes of Health/National Cancer Institute Award R37 CA23195.
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Scott Fligor: Conceptualization, formal analysis, methodology, writing – original draft, writing – review and editing. Betzamel Lopez: Formal analysis, methodology, visualization, writing – original draft, writing – review and editing. Nishant Uppal: Methodology, writing – review and editing. Carrie Lubitz: Methodology, supervision, writing – review and editing. Benjamin James: Conceptualization, methodology, supervision, writing – review and editing.
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Scott C. Fligor, Betzamel Lopez, Nishant Uppal, Carrie C. Lubitz, and Benjamin C. James have no conflicts of interest to declare.
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Scott C. Fligor and Betzamel Lopez are considered as co-first authors on this work.
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Fligor, S.C., Lopez, B., Uppal, N. et al. Time to Surgery and Thyroid Cancer Survival in the United States. Ann Surg Oncol 28, 3556–3565 (2021). https://doi.org/10.1245/s10434-021-09797-z
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DOI: https://doi.org/10.1245/s10434-021-09797-z