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Table 1 Baseline patient characteristics of the colorectal cancer cohort (n = 550,325)

From: Impact of prior malignancies on outcome of colorectal cancer; revisiting clinical trial eligibility criteria

Patient Characteristics All patients No. Prior malignancy No. (%)+ No prior malignancy No. (%)+
Age
 < 20 319 2 (0.6) 317 (99.4)
 20–65 190507 5091 (2.7) 185416 (97.3)
 > 65 359499 26570 (7.4) 332929 (92.6)
Sex
 Male 271959 17535 (6.4) 254424 (93.6)
 Female 278366 14128 (5.1) 264238 (94.9)
Site
 Rectum 161326 8224 (5.1) 153102 (94.9)
 Colon 388999 23439 (6) 365560 (94.0)
Race
 White 458185 27267 (6) 430918 (94.0)
 Black 52918 2845 (5.4) 50073 (94.6)
 Others 36920 1538 (4.2) 35382 (95.8)
Marital Status
 Single 57126 2470 (4.3) 54656 (95.7)
 Married 299526 17787 (5.9) 281739 (94.1)
 Separated 8217 282 (3.4) 7935 (96.6)
 Divorced 37197 1891 (5.1) 35306 (94.9)
 Widowed 126147 8086 (6.4) 118061 (93.6)
Stage
 Localized 199159 12848 (6.5) 186311 (93.5)
 Regional 197018 10884 (5.5) 186134 (94.5)
 Distant 119763 5980 (5) 113783 (95.0)
Grade
 Well differentiated 53999 3032 (5.6) 50967 (94.4)
 Moderately differentiated 288514 17377 (6) 271137 (94.0)
 Poorly differentiated 88748 5470 (6.2) 83278 (93.8)
 Undifferentiated, Anaplastic 5936 374 (6.3) 5562 (93.7)
Histology recode broad groupings
 Adenomas and adenocarcinomas 465847 26782 (5.7) 439065 (94.3)
 Cystic, mucinous and serous neoplasms 55884 3426 (6.1) 52458 (93.9)
 Epithelial neoplasms, NOS 18108 925 (5.1) 17183 (94.9)
 Squamous cell neoplasms 1815 118 (6.5) 1697 (93.5)
Radiation
 Yes 61226 2381 (3.9) 58845 (96.1)
 No 482430 29039 (6) 453391 (94.0)
Surgery
 Yes 467713 26940 (5.8) 440773 (94.2)
 No 60051 4020 (6.7) 56031 (93.3)
 Ablation 807 61 (7.6) 746 (92.4)
  1. +This number represents the percentage of patients with a prior malignancy within each characteristic
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