Table 1.

Characteristics of 68 pre-treatment tumor specimens derived from 41 patients receiving anti-PD-1 therapy.

Characteristic	No. of Patients (N=41)
Patient response to treatment
Complete	2
Partial	8
Stable disease ≥6 months	2
No response	29
Patient diagnosis
Melanoma	16
Non-small cell lung cancera	12
Kidney cancer	6
Colorectal cancer	5
Castration-resistant prostate cancer	2
No. tumor specimens analyzed per patient
1	25
2	9
3	5
4	0
5	2
	No. of Specimens (N=68)
Primary vs. metastatic tumor
Primary	29
Metastasis	39
Anatomic location
lymph node (metastasis)	17
lung (primary or metastasis)	15
other	36

^aTwelve cases include 9 adenocarcinomas and 3 squamous cell carcinomas of the lung.