Table 21.

Histological classification

Histological classification	Cases (%)
Squamous cell carcinoma	3045 (86.0%)
Squamous cell carcinoma	584 (16.5%)
Well differentiated	566 (16.0%)
Moderately differentiated	1445 (40.8%)
Poorly differentiated	450 (12.7%)
Adenocarcinoma	161 (4.5%)
Barrett’s adenocarcinoma	71 (2.0%)
Adenosquamous cell carcinoma	20 (0.6%)
Mucoepidermoid carcinoma	3 (0.1%)
Adenoid cystic carcinoma	2 (0.1%)
Basaloid carcinoma	71 (2.0%)
Endocrine cell carcinoma	15 (0.4%)
Undifferentiated carcinoma	6 (0.2%)
Other carcinoma	14 (0.4%)
Carcinosarcoma	18 (0.5%)
Malignant melanoma	16 (0.5%)
GIST	1 (0.0%)
Other	33 (0.9%)
Unknown	66 (1.9%)
Total	3542