Table 1.

Patient characteristics in the training and the independent extra validation cohorts.

Training cohort				Extra validation cohort
Characteristics		Number of cases	% (percentage)	Characteristics		Number of cases	% (percentage)
Age at initial diagnosis (years)		329 (16–90)		Age at initial diagnosis (years)		232 (31–89)
Age				Age
	>65	119	36.17		>65	142	61.21
	≤65	210	63.83		≤65	90	38.79
Gender				Gender
	Men	226	68.69		Men	171	73.71
	Women	103	31.31		Women	61	26.29
Tumor stage				Tumor stage
	I	155	47.11		I	36	15.52
	II	74	22.49		II	106	45.69
	III	76	23.10		III	71	30.60
	IV	3	0.91		IV	19	8.19
	Unknown	21	6.38
Grade				Prior malignancy
	1	50	15.20		Yes	30	12.93
	2	155	47.11		No	202	87.07
	3	107	32.52
	4	12	3.65
	Unknown	5	1.52