Patterns of Sociodemographic and Clinicopathologic Characteristics of Stages II and III Colorectal Cancer Patients by Age: Examining Potential Mechanisms of Young-Onset Disease
Table 4
Receipt of chemotherapy and radiation therapy among 6,862 patients diagnosed with stages II and III colorectal cancer, 1990–2010, by age and stage at diagnosis.
Stage II ( = 3,329)
Stage III ( = 3,533)
Age < 50
Age 50–69
Age ≥ 70
Age < 50
Age 50–69
Age ≥ 70
(wt.%)
(wt.%)
(wt.%)
(wt.%)
(wt.%)
(wt.%)
Received chemotherapy1
Colon cancer
No
71 (29.2)
465 (57.4)
809 (86.0)
43 (18.0)
156 (17.9)
439 (50.9)
Yes
121 (70.8)
281 (42.6)
131 (14.0)
180 (82.0)
621 (82.1)
390 (49.1)
Rectal cancer
No
28 (17.6)
216 (34.3)
323 (52.3)
24 (6.0)
101 (9.1)
264 (42.3)
Yes
128 (82.4)
444 (65.7)
225 (47.7)
248 (94.0)
674 (90.9)
307 (57.7)
Received radiation therapy2
Rectal cancer
No
45 (28.5)
241 (39.0)
342 (57.1)
67 (23.3)
253 (30.1)
357 (57.8)
Yes
112 (71.5)
431 (61.0)
214 (42.9)
209 (76.7)
531 (69.9)
227 (42.2)
. Note. Proportions weighted by sampling fraction. wt.: weighted. 1Receipt of chemotherapy includes both neoadjuvant and adjuvant (or both) chemotherapy. 2Receipt of radiation therapy includes postoperative and preoperative radiation.