Linear Relation Between Age and Survival in Papillary Thyroid Cancer

Linear reduction in cancer-specific survival with increasing age, with no evidence of a cut point
Linear reduction in cancer-specific survival with increasing age, with no evidence of a cut point

HealthDay News — For patients with papillary thyroid cancer (PTC), patient age is associated with death in a linear fashion, with no apparent age cut point demarcating survival difference, according to a study published online October 28 in the Journal of Clinical Oncology.

Mohamed Abdelgadir Adam, MD, from the Duke University Medical Center in Durham, NC, and colleagues identified patients with PTC from the Surveillance, Epidemiology, and End Results database from 1998 to 2012. Using several flexible smoothing approaches, they examined the correlation between age and cancer-specific survival (CSS). 

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Data were included for 31,802 patients with PTC (median age, 45 years). The researchers found that 10-year CSS was 99.8% for ages 2 to 19 years; 99.9% for ages 20 to 29 years; 99.8% for ages 30 to 39 years; 99.5% for ages 40 to 49 years; 98.1% for ages 50 to 59 years; 94.8% for ages 60 to 69 years; 91.5% for ages 70 to 79 years; 79.2% for ages 80 to 89 years; and 73.9% for ages 90 years and older. Increasing age correlated with increased disease-related mortality in a dose-dependent manner after adjustment for patient demographics and clinicopathologic characteristics, without an apparent cut point.

"These results challenge the appropriateness of a patient age cut point in current staging systems for PTC and argue for considering a revision in how we anticipate prognosis for patients with PTC," the authors write.

One author disclosed financial ties to the pharmaceutical industry.

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