Table 2.

Comparison of immunohistochemistry variables between negative and positive groups.

Variable	Serum calcitonin level		p
	Positive (n = 288)	Negative (n = 24)
Calcitonin
Positive	221	14
Negative	67	10	0.052
Carcino-Embryonic Antigen
Positive	167	10
Negative	121	14	0.121
Chromogranin A
Positive	139	7
Negative	149	17	0.072
Ki-67
≤10%	110	21
>10%	178	3	<0.001