Evaluation of the Clinical Utility of Circulating Biomarkers in Advanced Thyroid Carcinomas

For each patient enrolled in the present study, 4 EDTA tubes of peripheral blood will be collected to be used to obtain molecular profiling during scheduled laboratory controls as per normal clinical practice according to the following time schedule: * T0 = basal collection before initiation of systemic treatment; * T1 = sampling at 1 month after the start of systemic treatment; * T2 = sampling at 3 months (+/- 1 month) after the start of systemic treatment at the first instrumental re-evaluation of disease; * T3 = sampling at 6 months (+/- 1 month) from the start of systemic treatment at the time of instrumental disease reassessment; * T4 = sampling at the time of evidence of instrumental disease progression within 24 months of treatment initiation. The following analyses will be conducted on the samples thus collected: * multigenic analysis on ccf-DNA and ccf-RNA at baseline, i.e., before the initiation of systemic treatment; * isolation, counting and analysis of CTCs at baseline vi