Table 2. Preoperational serological test results of the MTC patients.

Case	Serum calcitonin (2.93-34.8ng/l)	Carcinoembryonic antigen (CEA) (<5.0ng/ml)
1	>1535	198.2
2	no	66.28
3	no	5.62
4	no	40
5	>1535	37.55
6	no	3.61
7	69.4	72.55
8	865.02	4.90
9	55.65	5.70
10	71.17	9.74
11	no	143.0
12	296.65	283.56
13	33.13	27.9
14	33.94	36.5
15	no	56.44
16	521.28	59.78
17	1460	52.37
18	1251.75	12.28
19	1375.8	19.5
20	494.4	5.55

MTC, medullary thyroid carcinoma; no, data missing.