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Table 1 Definition of Immunostaining scores for egfr protein expression in ESCC cases from Tehran (total examined numbers=34)

From: Epidermal growth factor receptor (EGFR) mutations and expression in squamous cell carcinoma of the esophagus in central Asia

Score Definition Number (%)
 0 No staining or background-type staining 3 (8.8)
 1+ Definite cytoplasmic staining and/or equivocal discontinuous membranous staining 9 (26.5)
 2+ Unequivocal membrane staining with moderate intensity in over 10%of the cells 16 (47.0)
 3+ Strong, continuous membrane staining in over 10% of the cells 6 (17.7)