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Table 1 Patient characteristics

From: Better survival in right-sided versus left-sided stage I - III colon cancer patients

  Patient characteristics
   Total Right-sided carcinoma Left-sided carcinoma Pa
N = 91,416 N = 51,937 N = 39,479
Tumor stage Stage I 25,482 (27.9 %) 13,864 (26.7 %) 11,618 (29.4 %) <0.001
(AJCC 6th ed.) Stage II 33,323 (36.5 %) 19,965 (38.4 %) 13,358 (33.8 %)  
  Stage III 32,611 (35.7 %) 18,108 (34.9 %) 14,503 (36.7 %)  
T-stage T1 14,110 (15.4 %) 6415 (12.4 %) 7695 (19.5 %) <0.001
  T2 15,873 (17.4 %) 9580 (18.4 %) 6293 (15.9 %)  
  T3 51,416 (56.2 %) 29,980 (57.7 %) 21,436 (54.3 %)  
  T4 10,017 (11.0 %) 5962 (11.5 %) 4055 (10.3 %)  
Number of positive 0 58,805 (64.3 %) 33,829 (65.1 %) 24,976 (63.3 %) <0.001
regional lymph nodes 1 10,557 (11.5 %) 5627 (10.8 %) 4930 (12.5 %)  
  2–3 10,531 (11.5 %) 5672 (10.9 %) 4859 (12.3 %)  
  4–6 6560 (7.2 %) 3692 (7.1 %) 2868 (7.3 %)  
  7+ 4963 (5.4 %) 3117 (6.0 %) 1846 (4.7 %)  
Number of retrieved <12 lymph nodes 24,256 (26.5 %) 10,243 (19.7 %) 14,013 (35.5 %) <0.001
regional lymph nodes 12–16 lymph nodes 26,123 (28.6 %) 14,917 (28.7 %) 11,206 (28.4 %)  
  17+ lymph nodes 41,037 (44.9 %) 26,777 (51.6 %) 14,260 (36.1 %)  
Grading G1 8568 (9.4 %) 4721 (9.1 %) 3847 (9.7 %) <0.001
  G2 64,221 (70.3 %) 34,812 (67.0 %) 29,409 (74.5 %)  
  G3 14,228 (15.6 %) 9886 (19.0 %) 4342 (11.0 %)  
  G4 1490 (1.6 %) 1099 (2.1 %) 391 (1.0 %)  
  Unknown 2909 (3.2 %) 1419 (2.7 %) 1490 (3.8 %)  
Histology Adenocarcinoma 64,760 (70.8 %) 35,637 (68.6 %) 29,123 (73.8 %) <0.001
  Adeno-Ca in adenomatous polyp 6791 (7.4 %) 2885 (5.6 %) 3906 (9.9 %)  
  Adeno-Ca in villous adenoma 2646 (2.9 %) 1721 (3.3 %) 925 (2.3 %)  
  Adeno-Ca in tubulovillous adenoma 8142 (8.9 %) 4897 (9.4 %) 3245 (8.2 %)  
  Mucinous carcinoma 9077 (9.9 %) 6797 (13.1 %) 2280 (5.8 %)  
CEA C0-stage 32,999 (36.1 %) 18,679 (36.0 %) 14,320 (36.3 %) 0.185
  C1-stage 17,232 (18.9 %) 9896 (19.1 %) 7336 (18.6 %)  
  Unknown/Borderline 41,185 (45.1 %) 23,362 (45.0 %) 17,823 (45.1 %)  
Operation Segmental resection 36,201 (39.6 %) 7750 (14.9 %) 28,451 (72.1 %) <0.001
  Hemi/subtotal colectomy 54,241 (59.3 %) 43,777 (84.3 %) 10,464 (26.5 %)  
  Other 974 (1.1 %) 410 (0.8 %) 564 (1.4 %)  
Year 2004 to 2006 31,514 (34.5 %) 17,703 (34.1 %) 13,811 (35.0 %) 0.005
  2007 to 2009 31,314 (34.3 %) 17,798 (34.3 %) 13,516 (34.2 %)  
  2010 to 2012 28,588 (31.3 %) 16,436 (31.6 %) 12,152 (30.8 %)  
Age Up to 49 years 8015 (8.8 %) 3175 (6.1 %) 4840 (12.3 %) <0.001
  50 to 64 years 26,347 (28.8 %) 12,344 (23.8 %) 14,003 (35.5 %)  
  65 to 79 years 35,693 (39.0 %) 21,435 (41.3 %) 14,258 (36.1 %)  
  80+ years 21,361 (23.4 %) 14,983 (28.8 %) 6378 (16.2 %)  
Gender Male 43,981 (48.1 %) 23,053 (44.4 %) 20,928 (53.0 %) <0.001
  Female 47,435 (51.9 %) 28,884 (55.6 %) 18,551 (47.0 %)  
Ethnicity Caucasian 72,937 (79.8 %) 42,296 (81.4 %) 30,641 (77.6 %) <0.001
  African-American 10,572 (11.6 %) 6286 (12.1 %) 4286 (10.9 %)  
  Other/Unknown 7907 (8.6 %) 3355 (6.5 %) 4552 (11.5 %)  
Marital status Married 49,901 (54.6 %) 27,219 (52.4 %) 22,682 (57.5 %) <0.001
  Single 11,581 (12.7 %) 6120 (11.8 %) 5461 (13.8 %)  
  Widowed 17,770 (19.4 %) 11,835 (22.8 %) 5935 (15.0 %)  
  Other/Unknown 12,164 (13.3 %) 6763 (13.0 %) 5401 (13.7 %)  
  1. All data shown as n (%)
  2. AJCC, American Joint Committee on Cancer, T-stage tumor stage, CEA Carcinoembryonic antigen
  3. aChi-Square test