Different Anatomical Subsites of Colon Cancer and Mortality: A Population-Based Study
Table 1
Baseline patient and disease characteristics of patients by primary tumour location.
Characteristic
Right-sided tumours
Left-sided tumours
Year at diagnosis
<0.001
1973–1982
18,670 (10.3%)
26,094 (13.2%)
1983–1992
25,442 (14.1%)
33,380 (16.9%)
1993–2002
51,278 (28.3%)
54,272 (27.6%)
2003–2012
85,499 (47.3%)
83,214 (42.2%)
Age at diagnosis†
<0.001
<50 y
13,333 (7.4%)
22,511 (11.4%)
50–69 y
67,385 (37.3%)
93,511 (47.5%)
≥70 y
100,171 (55.4%)
80,938 (41.1%)
Gender
<0.001
Male
80,436 (44.5%)
103,612 (52.6%)
Female
100,453 (55.5%)
93,348 (47.4%)
Race
<0.001
White
149,172 (82.5%)
159,284 (80.9%)
Black
20,626 (11.4%)
18,880 (9.6%)
Other (AP, AI/AN)
10,545 (5.8%)
17,772 (9.0%)
Unknown
546 (0.3%)
1024 (0.5%)
Insurance status
<0.001
Insured
49,043 (27.1%)
45,911 (23.3%)
Uninsured
1520 (0.8%)
1991 (1.0%)
Unknown
130,326 (72.0%)
149,058 (75.7%)
Marital status
<0.001
Married
97,678 (54.0%)
115,912 (58.9%)
Unmarried
76,752 (42.4%)
73,159 (37.1%)
Unknown
6459 (3.6%)
7889 (4.0%)
Tumour stage
<0.001
Localized
65,978 (36.5%)
78,611 (39.9%)
Regional
76,694 (42.4%)
76,269 (38.7%)
Distant
38,217 (21.1%)
42,080 (21.4%)
Tumour grade‡
<0.001
I
16,562 (9.2%)
22,181 (11.3%)
II
104,036 (57.5%)
120,896 (61.4%)
III
38,575 (21.3%)
24,897 (12.6%)
IV
2790 (1.5%)
1546 (0.8%)
Unknown
18,926 (10.5%)
27,440 (13.9%)
Surgery
<0.001
Surgery
173,582 (96.0%)
187,853 (95.4%)
No surgery
7202 (4.0%)
8993 (4.6%)
Unknown
105 (0.1%)
114 (0.1%)
Radiation
<0.001
Radiation
3453 (1.9%)
15,658 (7.9%)
No radiation
175,810 (97.2%)
179,168 (91.0%)
Unknown
1626 (0.9%)
2134 (1.1%)
Chemotherapy
<0.001
Yes
50,568 (28.0%)
59,160 (30.0)
No
130,321 (72.0%)
137,800 (70.0%)
†Year; ‡I means well differentiated; II means moderately differentiated; III means poorly differentiated; IV means undifferentiated. AP: Asian or Pacific Islander; AI/AN: American Indian/Alaska Native.
