Table 1.

Patient and Tumor Characteristics

Characteristic	mRNA Array(n = 34)		Validation Set(n = 146)
	No.	%	No.	%
Age at diagnosis, years
Mean	68		66
Range	44-90		31-92
Male sex	25	74	96	66
Stage at MCC presentation*
I	10	29	47	33
II	3	9	31	22
III	18	53	60	42
IV	3	9	6	4
Lesion type studied*
Primary	9	31	113	80
Regional metastasis/rec	15	52	25	18
Distant metastasis	5	17	5	4
MCPyV DNA detectable?
Yes	19	70	40	75
No	8	30	13	25

NOTE. Patients represented in the validation set were entirely nonoverlapping with patients represented in the mRNA array set. Stage information was not available for seven patients; lesion type information was not available for eight patients; and MCPyV DNA status was not available for 100 patients. Patients with nodal presentation and unknown primary are represented in the regional metastasis category (n = 14).

Abbreviations: MCC, Merkel cell carcinoma; rec, recurrence; MCPyV, Merkel cell polyomavirus.

^*Significant differences (P < .05) between array and validation set.