Table 6. Tumor proportion scores of primary tumors and lymph nodes by Dako PD-L1 IHC 28-8 PharmDx assay.

Primary tumor	Lymph node (%)
	No	Low	High
No expression (<1%)	4 (11.4)	3 (8.6)	1 (2.9)
Low expression (1–49%)	11 (31.4)	6 (17.1)	4 (11.4)
High expression (>50%)	3 (8.6)	2 (5.7)	1 (2.9)

Pearson’s chi-square test: P=0.989.