Programmed cell death protein ligand 1 (PD-L1) detection in pleural effusion based on all cases with successful PD-L1 analysis. Cross-classification of pleura biopsy and pleura effusion analysis results concerning PD-L1 detection
| PD-L1 expression ≥50% of tumour cells defined as positive | PD-L1 expression ≥1% of tumour cells defined as positive | |||||
| Pleural biopsy | Total | Pleural biopsy | Total | |||
| Positive | Negative | Positive | Negative | |||
| Pleural effusion | ||||||
| Positive | 5 | 6 | 11 | 12 | 4 | 16 |
| Negative | 0 | 10 | 10 | 2 | 3 | 5 |
| Total | 5 | 16 | 21 | 14 | 7 | 21 |