Relationship between Tg mRNA levels, Tg protein, and radioactive iodine uptake for thyroidectomized patients with persistent PTC. The whole blood Tg mRNA levels for the five patients with PTC are presented as pg Eq/μg total thyroid RNA. A, Tg mRNA levels are significantly correlated with the serum Tg protein level. (r = 0.90, p = 0.037). B, Tg mRNA levels are significantly correlated with total body 131I uptake (r = 0.92, p = 0.026). The two patients with negative 5-mCi scans are entered as 0% uptake.