Patterns of Sociodemographic and Clinicopathologic Characteristics of Stages II and III Colorectal Cancer Patients by Age: Examining Potential Mechanisms of Young-Onset Disease

Table 2

Characteristics of 706 younger (age < 50 years) patients diagnosed with stages II and III colorectal cancer, 1990–2010, by race/ethnicity.

	⁢NH white		⁢NH black ()		⁢Hispanic ()
		Weighted^1%		Weighted^1%		Weighted^1%
Sex
Male	184	54.8	109	52.1	94	52.7
Female	133	45.2	91	47.9	95	47.3
Insurance
Private/HMO/VA/other	275	86.1	129	60.7	114	67.7
Medicaid (any)	22	10.8	48	26.1	35	19.6
None	11	3.0	16	10.5	29	9.8
Tumor site
Right colon	49	19.4	62	38.5	42	26.3
Left colon	28	13.8	29	19.9	29	16.4
Sigmoid colon	44	25.9	29	17.8	33	24.3
Rectum	193	40.9	80	23.8	83	32.9
Mucinous histology	30	10.4	36	17.7	29	11.8
Histologic grade
Well/moderately differentiated	246	80.7	146	81.7	140	79.2
Poorly/undifferentiated	57	19.3	39	18.3	40	20.8
Stage at diagnosis
Stage II	118	42.7	86	47.4	87	38.0
Stage III	199	57.3	114	52.6	102	62.0
MSI testing performed^3
Yes	14	25.4	20	31.6	18	23.5
No	36	74.6	32	68.4	42	76.5
Unknown	9		1		6
SES index
Quintile 1	11	7.7	46	37.9	45	28.0
Quintile 2	30	22.5	26	24.2	34	20.9
Quintile 3	26	16.3	18	16.3	30	27.4
Quintile 4	37	21.8	20	16.1	25	17.0
Quintile 5	43	31.7	12	5.4	8	6.7

.
NH: non-Hispanic; VA: Veterans Affairs; MSI: microsatellite instability; SES: socioeconomic status.
¹Proportions weighted by sampling fraction.
²Percentages do not add to 100 because some younger patients were insured through Medicare; cell sizes too small (<5) to report.
³MSI testing collected in 2010 only.
⁴Socioeconomic status based on composite census-tract-level indicators from Census 2000 and American Community Survey 2005–2009; limited to study years 2000, 2005, and 2010 and not including Louisiana.