TABLE 2

Summary of malignancy and programmed cell death protein ligand 1 (PD-L1) status

Pleural effusion nPleural biopsy n
Cases5050
Malignancy (+/−/○)36/7/740/10/0
PD-L1 ≥1% of tumour cells (+/−/nd)19/6/2521/14/15
PD-L1 ≥50% of tumour cells (+/−/nd)13/12/258/27/15

+: positive; −: negative; ○: inconclusive; nd: not done.