Table 1 Clinicopathological features of 31 primary cutaneous neuroendocrine or Merkel cell carcinomas

No.	Merkel cell carcinoma	Age	Sex	Site	Status	DFI (months)	Follow-up (months)
1	Primary	54	F	Back	NED	—	323
2	Primary	91	M	Neck	DOD	4	5
3	Primary	65	F	Leg	NED	—	214
4	Primary	84	M	Leg	DOD	3	16
5	Primary	91	F	Cheek	DOD	3	22
6	Primary	81	M	Leg	NED	—	138
7	Primary	68	M	Front	DOD	2	10
8	Primary	81	M	Leg	NED	—	94
9	Primary	57	F	Thigh	DOD	2	4
10	Primary	85	F	Thigh	DOD	4	24
11	Primary	80	F	Cheek	NED	—	90
12	Metastatic	78	F	Leg	DOD	16	49
13	Primary	89	F	Knee	DOD	6	10
14	Primary	73	F	Cheek	NED	—	87
15	Primary	78	F	Cheek	NED	—	56
16	Primary	89	F	Front	NED	—	24
17	Primary	87	F	Lip	DOC	—	2
18	Primary	67	F	Knee	NED	—	80
19	Primary	78	M	Thigh	NED	—	79
20	Primary	82	F	Arm	LOST	—	—
21	Primary	92	F	Leg	LOST	—	—
22	Primary	85	M	Thigh	DOD	6	9
23	Primary	79	F	Leg	NED	—	35
24	Primary	80	F	Forearm	LOST	—	—
25	Primary^a	74	M	Eyebrow	AWD	3	54
26	Metastatic^a	75	M	Neck	AWD	3	54
27	Primary	86	F	Eyelid	LOST	—	—
28	Primary	42	M	Arm	NED	—	46
29	Primary	77	F	Cheek	NED	—	39
30	Primary	76	F	Forearm	NED	—	35
31	Primary	63	M	Hand	NED	—	31

M: male; F: female; NED: no evidence of disease; AWD: alive with disease; DOD: dead of disease; DOC: dead of other causes; DFI: disease-free interval.
^aPrimary and metastatic Merkel cell carcinomas belong to the same patient.

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