A Nomogram-Based Risk Classification System Predicting the Overall Survival of Childhood with Clear Cell Sarcoma of the Kidney Based on the SEER Database
Table 1
Baseline characteristics of CCSK patients.
Characteristic
Frequency (n, %)
Training cohort (n, %)
Validation cohort (n, %)
value
Age (years)
0.1694
Median (IQR)
3 (0–19)
<3.44
1582 (61.1)
1122 (61.9)
460 (59.3)
>3.44
1006 (38.9)
690 (38.1)
316 (40.7)
Gender
0.9718
Male
1222 (47.2)
856 (47.2)
366 (47.2)
Female
1366 (52.8)
956 (52.8)
410 (52.8)
Race
0.8253
White
1955 (75.5)
1369 (75.6)
586 (75.5)
Black
448 (17.3)
312 (17.2)
136 (17.5)
Asian or Pacific Islander
121 (4.7)
87 (4.8)
34 (4.4)
American Indian/Alaska native
34 (1.3)
24 (1.3)
10 (1.3)
Origin
0.9231
Spanish-Hispanic-Latino
687 (26.5)
482 (26.6)
205 (26.4)
Non-Spanish-Hispanic-Latino
1901 (73.5)
1330 (73.4)
571 (73.6)
Laterality
0.793
Right
1173 (45.3)
823 (45.4)
350 (45.1)
Left
1216 (47.0)
852 (47.0)
364 (46.9)
Bilateral
183 (7.1)
126 (4.9)
57 (7.3)
Combined stage
0.08337
Distant
459 (17.7)
311 (17.2)
148 (19.1)
Localized
816 (31.5)
567 (31.3)
249 (32.1)
Regional
605 (23.4)
439 (17.0)
166 (21.4)
Radiation
0.8683
Beam
1201 (46.4)
840 (46.4)
361 (46.5)
None
1361 (52.6)
956 (52.8)
405 (52.2)
Chemotherapy
0.658
Yes
2348 (90.7)
1641 (90.6)
707 (91.1)
No
240 (9.3)
171 (9.4)
69 (8.9)
CCSK, clear cell sarcoma of the kidney; IQR, interquartile range.
