Tc-HYNIC-TOC (TOC for short) in the detection of recurrent
or metastatic medullary thyroid carcinoma (MTC).
Methods:
From Jul. 2013 to Oct. 2016
24 patients with suspicious recurrent or postoperative metastatic MTC
who underwent both DMSA and TOC imaging in our hospital
were enrolled in this retrospective study. The surgical pathology or clinical follow-up data were collected in order to compare the diagnostic values of these two methods.
Results:
In the patient-based analysis
the sensitivity of DMSA and TOC were 62.5% and 37.5%
respectively
the difference was statistically significant (
P
=0.031). In the lesion-based analysis (
n
=44)
the sensitivity of DMSA (93.2%) was statistically higher than TOC (43.2%) (
P
0.000 1). Using a cut-off calcitonin value of 500 pg/mL: lesions in patients with calcitonin lower than this value (
n
=11)
the sensitivity of DMSA and TOC were 81.8% and 18.2%
respectively (
P
=0.016)
lesions in patients with calcitonin exceeding this value (
n
=33)
they raised to 97.0% and 51.5%
respectively (
P
0.000 1). In detecting soft tissue lesions (
n
=36)
DMSA had higher sensitivity than TOC (
P
0.000 1). Whereas
there was no statistical difference in the sensitivity for bone lesions (
n
=8) between two methods (
P
=0.219).
Conclusion:
DMSA has higher sensitivity than TOC in detecting the recurrence or metastatic medullary thyroid carcinoma.