Table 1 Patient and sample characteristics.

Age (years)

   Median

   Range

Gender (number)

   Male

   Female

Specimens (number)

   Biopsies

   Resection

Histological findings (number)

   Well differentiated SCC

   Moderately differentiated SCC

   Poorly differentiated SCC

Evaluable cases (number) for

   EGFR immunostaining

   EGFR FISH

   EGFR mutation analysis

exon18

exon19

exon20

exon21

   K-RAS mutation analysis