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Overall cancer-specific survival. Kaplan–Meier causes for cancer-related mortality in Sicily (The Sicilian Regional Register for Thyroid Cancers, red) and USA (Surveillance Epidemiology and End Results, blue). Anaplastic thyroid cancer patients are subdivided according to age (<70 or ≥70 years) at diagnosis. The log-rank p-value is significant (0.02) for the difference in younger patients (<70 years) but not older ones (0.28).
