Table 5. Tumor proportion scores of primary tumors and lymph nodes by Dako PD-L1 IHC 22C3 PharmDx.

Primary tumor	Lymph node (%)
	No	Low	High
No expression (<1%)	4 (11.4)	3 (8.6)	0 (0)
Low expression (1–49%)	12 (34.3)	6 (17.1)	4 (11.4)
High expression (>50%)	2 (5.7)	4 (11.4)	0 (0)

Pearson’s chi-square test: P=0.300.