Table 2.

Potential biomarkers of exosomal miRNAs in different types of TC.

Origin	Potential biomarker	Expression level	Reference
PTC plasma exosomes	miR-346, miR10a-5p, and miR34a-5p	Up	[44]
PTC- and ATC-derived exosomes	miR-145	Down	[52]
PTC-derived exosomes	miRNA-146b and miRNA-222	Up	[41, 81]
FTC-derived exosomes	miR-21-5p and miR-221-3p	Up	[42]
PTC-derived exosomes	miR-181a	Up	[42]