Establishment and Verification of Prognostic Nomograms for Patients with Gastrointestinal Stromal Tumors: A SEER-Based Study

Table 1

Characteristics of the training and validation cohorts.

Characteristic	All Patients (n = 6713)		Training Cohort (n = 4699)		Validation Cohort (n = 2014)
	No.	%	No.	%	No.	%
Age at diagnosis, years
Median	63.4±14.3		63.4±14.3		63.5±14.2
Range	10 - 101		10 - 101		14 - 101
Gender
Male	3522	52.5	2442	52.0	1080	53.6
Female	3191	47.5	2257	48.0	934	46.4
Race
White	4607	68.6	3266	69.5	1341	66.6
Black	1217	18.1	818	17.4	399	19.8
Others	846	12.6	588	12.5	258	12.8
Unknown	43	0.7	27	0.6	16	0.8
Tumor size
⩽ 5 cm	2459	36.6	1723	36.7	736	36.6
5.1-10 cm	2017	30.1	1424	30.3	593	29.4
> 10 cm	1503	22.4	1036	22.0	467	23.2
Unknown	734	10.9	516	11.0	218	10.8
Location
Stomach	4241	63.2	2974	63.3	1267	62.9
Small intestine	1910	28.5	1313	27.9	597	29.6
Colon/Rectum	334	5.0	242	5.2	92	4.6
Others	228	3.3	170	3.6	58	2.9
Surgery of primary
No surgery of primary tumor	1228	18.3	855	18.2	373	18.5
Surgery of primary tumor	5420	80.7	3804	81.0	1616	80.3
Unknown	65	1.0	40	0.8	25	1.2

Others includes American Indian/Alaskan Native and Asian/Pacific Islander; Others includes esophagus, appendix, and peritoneum.