Table 2.

Results of EGFR immunostaining

Primary	Distant Recurrence			Total
	Negative	1+	2+
Negative	8	4	0	12
1+	6	5	1	12
2+	2	1	6	9
Total	16	10	7	33

Negative No staining above the background

1+ Immunopositivity in < 50% of cells

2+ Immunopositivity in > 50% of cells