| Edinburgh | Cambridge | Total | |
| Total cases | 23 | 25 | 48 |
| Total cases with cell blocks containing tumour cells | 14 | 25 | 39 |
| Cases correctly classified when no cell block with tumour cells available | 4/9 | NA | 4/9 |
| Cases correctly classified on morphology alone (cytological + cell block) | 9/14 | 16/25 | 25/39 |
| Cases correctly classified on morphology (cytology + cell block) with additional immunohistochemical staining | 12/14 | 21/25 | 33/39 |
Data are presented as n or n/N. Summary of accuracy of classification of nonsmall cell carcinoma in fine-needle aspirate samples in comparison with histology, stratified for the availability of cell blocks with tumour cells and immunohistochemistry. NA: not applicable.