Table 1.
Demographic data of all patients in squamous high grade dysplasia, carcinoma in situ United Kingdom radiofrequency ablation registry n (%)
| Variable | Value |
| No. of patients completed protocol | 20 |
| Age, yr | |
| mean ± SD | 71.6 ± 9.4 |
| Range | 38-88 |
| Sex, | |
| Female | 16 (80) |
| Male | 4 (20) |
| Caucasian ethnicity, | 20 (100) |
| Grade of esophageal neoplasia at study entry | |
| High grade dysplasia (Tis) | 12 (60) |
| ESCC (T1a) | 8 (40) |
| 1Focal squamous dysplasia | 4 (20) |
| 2Multi-focal squamous dysplasia | 16 (80) |
| Length of non-focal squamous dysplasia, cm | |
| mean ± SD | 6.1 ± 4.2 |
| Number of centers recruiting | 8 |
| Previous endoscopic mucosal resection | 5 (25) |
1Focal dysplasia refers to single plaques of dysplasia 1 cm or less in length; 2Multi-focal dysplasia refers to multiple plaques of dysplasia > 1 cm in length. ESCC: Early squamous cell carcinoma.