Table 4.
Concordance of PD-L1 expression within primary tumors, between primary tumors and lymph node or distant metastatic tumors.
| PD-L1 expression, No. (%) | Primary tumors | P value | Inconsistency probability | |
|---|---|---|---|---|
| Negative | Positive | |||
| Another location in primary tumors | < 0.001 | 17.8% | ||
| Negative | 175 (82.5) | 37 (17.5) | ||
| Positive | 31 (18.1) | 140 (81.9) | ||
| Lymph node metastatic tumors | < 0.001 | 31.4% | ||
| Negative | 42 (79.2) | 11 (20.8) | ||
| Positive | 22 (42.3) | 30 (57.7) | ||
| Distant metastatic tumors | 35.9 | 0.05 | ||
| Negative | 23 (76.7) | 7 (23.3) | 39.1% | |
| Positive | 18 (52.9) | 16 (47.1) | ||
Abbreviations: PD-L1, programmed death ligand 1.