Table 1.

PCT, CT, and CEA levels in the study groups

	Mean PCT ng/ml	Median PCT ng/ml	PCT positive levels	Mean CT pg/ml	Median CT pg/ml	CT positive levels	Mean CEA ng/ml	Median CEA ng/ml	CEA positive levels
Active MTC
Newly diagnosed	13.8	5.2	8/8	1336.0	777.5	8/8	53.1	17.8	8/8
Recurrent/metastatic	241.7	13.1	42/43	20447.9	3403.0	42/43	435.5	32.7	26/30
Stable	3.3	0.6	33/40	334.7	78.0	40/40	19.2	3.7	18/32
Cured MTC	<0.1	<0.1	0/42	5.5	<5.0	1/42	3.5	1.3	3/30
Follicular cell-derived carcinomas	0.1	<0.1	3/55	<5.0	<5.0	0/55	NT	NT	NT
Benign thyroid illnesses	0.1	<0.1	1/57	<5.0	<5.0	0/57	NT	NT	NT
Athyroid	<0.1	<0.1	0/120	<5.0	<5.0	0/120	NT	NT	NT
Neuroendocrine tumors	0.17	<0.1	22/225	16.2	<5.0	8/225	NT	NT	NT
Mastocytosis	<0.1	<0.1	2/48	6.1	<5.0	2/48	NT	NT	NT
Healthy donors	<0.1	<0.1	1/197	5.2	<5.0	0/197	NT	NT	NT

NT, Not tested.