Table 1. Clinical characteristics of training set and validation set.
| Characteristics | Total 4,146(100%) | Training set 2,904(70.0%) | Validation set 1,242(30.0%) | p-value | |
|---|---|---|---|---|---|
| Race | 0.005 | ||||
| White | 3,073(74.1%) | 2,192(75.5%) | 881(70.9%) | ||
| Black | 666(16.1%) | 450(15.5%) | 216(17.4%) | ||
| Others | 407(9.8%) | 262(9.0%) | 145(11.7%) | ||
| Gender | 0.761 | ||||
| Male | 2,225(53.7%) | 1,554(53.5%) | 671(54.0%) | ||
| Female | 1,921(46.3%) | 1,350(46.5%) | 571(46.0%) | ||
| Primary site | 0.205 | ||||
| Head | 1,911(46.1%) | 1,355(46.7%) | 556(44.8%) | ||
| Body | 473(11.4%) | 327(11.3%) | 146(11.8%) | ||
| Tail | 791(19.1%) | 566(19.5%) | 225(18.1%) | ||
| Others | 971(23.4%) | 656(22.6%) | 315(25.4%) | ||
| Grade | 0.393 | ||||
| High differentiated | 1,272(30.7%) | 909(31.3%) | 363(29.2%) | ||
| Low differentiated | 744(17.9%) | 520(17.9%) | 224(18.0%) | ||
| Unknown | 2,130(51.4%) | 1,475(50.8%) | 655(52.7%) | ||
| Pathological types | 0.251 | ||||
| Ductal adenocarcinoma | 2,820(68.0%) | 1,991(68.6%) | 829(66.7%) | ||
| Non-ductal adenocarcinoma | 1,326(32.0%) | 913(31.4%) | 413(33.3%) | ||
| AJCC | 0.833 | ||||
| I | 418(10.1%) | 297(10.2%) | 121(9.7%) | ||
| II | 1,098(26.5%) | 775(26.7%) | 323(26.0%) | ||
| III | 321(7.7%) | 228(7.9%) | 93(7.5%) | ||
| IV | 2,309(55.7%) | 1,604(55.2%) | 705(56.8%) | ||
| Surgery | 0.256 | ||||
| No | 2,593(62.5%) | 1,800(62.0%) | 793(63.8%) | ||
| Yes | 1,553(37.5%) | 1,104(38.0%) | 449(36.2%) |