. Author manuscript; available in PMC: 2014 Jul 1.

Published in final edited form as: Cancer Immunol Res. 2013 Jul;1:10.1158/2326-6066.CIR-13-0034. doi: 10.1158/2326-6066.CIR-13-0034

Table 2B.

Correlation of PD-L1 expression by tumor cells with PD-L1 expression by adjacent immune infiltrates in 67 MCC specimens

Tumor site	n	Tumor PD-L1(−), n (%)		Tumor PD-L1+, n (%)^a		p-value^b
Tumor site	n	TIL PD-L1(−)	TIL PD-L1+^a	TIL PD-L1(−)	TIL PD-L1+	p-value^b
Primary	29	12 (75)	4 (25)	0 (0)	13 (100)	< 0.001
Metastasis	38	21 (95)	1 (5)	0 (0)	16 (100)	< 0.001
All	67	33 (87)	5 (13)	0 (0)	29 (100)	< 0.001

Tumor cells or associated infiltrating immune cells were considered PD-L1+ if ≥5% of cells had membranous (cell surface) PD-L1 expression.

Fisher's exact test