Table 2.

The immunohistochemical expression of RAF1 in clinical specimens of patients

Tissue	Number of patients	Expression of p-RAF1		P Value*
		Positive	Negative
Primary tumor in patients with lymphatic metastasis	82	66	16	P < 0.001
Primary tumor in patients without lymphatic metastasis	31	9	22
Metastatic lymph node in patients	95	71	24

^*P values are from χ2 test or Fisher’s exact test and were statistically significant when < 0.05