Table 1.

Patient characteristics and estimated levels of CTCs

Number	Stage	Site	Number of CTCs per ml	EGFR expression on the primary tumor	Cytokeratin expression on the primary tumor
P1	T4BN2CM0	Larynx	720	2+	2+
P2	T3N3M0	Tonsil	104	N/A	N/A
P3	T4N2CM0	BOT	163	1+	3+
P4	T4aN1M0	Maxilla	429	N/A	N/A
P5	T2N2bM1	Larynx	181	3+	1+
P6	T1N3M0	Tonsil	N/A		3+
P7	T4N2CM0	Maxilla	232	2+	2+
P8	T4N2CM0	Soft Palate	59	N/A	N/A
P9	T1N0M0	Oral Tongue	7	3+	1+
P10	T4bN2CM0	Pyriform Sinus	43	N/A	N/A
P11	Recurrent	Oral Tongue	84	3+	1~2+
P12	Recurrent	Larynx	2	1+	1+
P13	T4N1M0	Nasopharynx	34	2+	2+
P14	Recurrent	FOM	31	2+	3+
P15	T1N2bM0	BOT	40	1+	3+
P16	T2N2bM0	Oral Tongue	25	1+	3+
P17	Recurrent	Oral Tongue	1	2+	2+
P18	T3N2cM0	Supraglottic	55	N/A	N/A
P19	T3N0M0	Larynx	36	N/A	N/A
P20	Recurrent	BOT	11	1+	3+
Healthy subjects(n=3)	N/A	N/A	0	N/A	N/A