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 chemotherapy^1
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 therapy^2
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.