Sensitivity, specificity, and positive and negative predictive values per biopsies for detection of dysplastic lesions in Barrett's oesophagus after different sensitisations using 5-aminolaevulinic acid (5-ALA)
| 5-ALA application mode | Examinations (biopsies) (n) | Sensitivity (%) | Specificity (%) | Pos. predictive value (%) | Neg. predictive value (%) |
| 500 mg locally | 22 (96) | 60 | 69 | 18 | 94 |
| 5 mg/kg orally | 4 (20) | — | 70 | 0 | 100 |
| 10 mg/kg orally | 13 (56) | 80 | 56 | 40 | 88 |
| 20 mg/kg orally | 13 (44) | 100 | 51 | 13 | 100 |
| 30 mg/kg orally | 6 (27) | 100 | 27 | 23 | 100 |