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Sensitivity of biopsy forceps in extrinsic neoplasms
| n | Sensitivity | |
| Pancreatic cancer | 55/86 | 64.0% |
| Site of stricture | ||
| Middle bile duct | 5/11 | 45.5% |
| Lower bile duct | 50/75 | 66.7% |
| Localization of tumor | ||
| Head | 52/76 | 68.4% |
| Body | 3/10 | 30.0% |
| Gallbladder cancer | 11/18 | 61.1% |
| Site of stricture | ||
| Perihilar bile duct | 6/11 | 54.5% |
| Distal bile duct | 5/7 | 71.4% |
| Metastasis | 8/14 | 57.1% |
| Site of stricture | ||
| Perihilar bile duct | 4/6 | 66.7% |
| Distal bile duct | 4/8 | 50.0% |
