Table 4.

PD-L1 expression of the primary tumors and paired distant metastatic lesions in NSCLC patients.

primary	metastases
	<1%	1%-49%	≥50%	total
<1%	32	15	2	49
1%-49%	9	17	4	30
≥50%	2	8	14	24
total	43	40	20	103