Table 1.

Baseline characteristics at the initial diagnosis of metastasis (N = 48)

			a, b, c, ¶
Variable	n	%
Sex
Male	34	70.8
Female	14	29.2
Age [median: 43 years (26–72)]
< 45	26	54.2
≥ 45 years	22	45.8
Time to metastasisa [median: 13.2 months (0–140.1)]
at primary diagnosis (M1)	14	29.2
during follow up (M0) [median: 27.5 m]	34	70.8
< 24 months	16	33.3
≥ 24	12	25.0
≥ 60	6	12.5
Number of metastasis at the initial diagnosis of metastasis
single	25	52.1
multiple	23	47.9
Location of metastasisb (number of patients)
lung	9	18.8
extrapulmonary metastasis	45	93.8
bone	15	31.3
abdomen or retroperitoneum	11	22.9
liver	9	18.8
other soft tissuesc	23	47.9
Size of the largest metastasis [median: 5 cm (1–20)]
< 10 cm	37	82.2
≥ 10	8	17.8
Diagnostic modality for the first metastasis
CT with contrast enhancement	22	45.8
CT without contrast enhancement	13	27.1
MRI	11	22.9
PET-CT	1	2.1
Others	1	2.1

^a Interval from primary diagnosis to the first metastasis

It was defined as 0 month in M1 patients

^b Presence of metastasis in indicated organ with or without that in another location

^c including lymph node metastasis

Abbreviations: CT computed tomography; MRI magnetic resonance imaging; PET-CT positron emission tomography