Colonoscopy screening in African Americans and Whites with affected first-degree relatives.
BACKGROUND
Family history is a risk factor for colon cancer, and guidelines recommend initiating screening at age 40 years in individuals with affected relatives. Racial differences in colon cancer mortality could be related to variations in screening of increased-risk individuals.


METHODS
Baseline data from 41 830 participants in the Southern Community Cohort Study were analyzed to determine the proportion of colonoscopy procedures in individuals with strong family histories of colon cancer, and whether differences existed based on race.


RESULTS
In participants with multiple affected first-degree relatives (FDRs) or relatives diagnosed before age 50 years, 27.3% (95% confidence interval [CI], 23.5%-31.1%) of African Americans reported having a colonoscopy within the past 5 years compared with 43.1% (95% CI, 37.0%-49.2%) of white participants (P<.001). African Americans in this group had an odds ratio of 0.51 (95% CI, 0.38-0.68) of having undergone recommended screening procedures compared with white participants after adjusting for age, sex, educational status, annual income, insurance status, total number of affected and unaffected FDRs, and time since last medical visit. African Americans with multiple affected FDRs or relatives diagnosed before age 50 years and who had ever undergone endoscopy were less likely to report a personal history of colon polyps (odds ratio, 0.29; 95% CI, 0.20-0.42) when compared with whites with similar family histories.


CONCLUSIONS
African Americans who have FDRs with colon cancer are less likely to undergo colonoscopy screening compared with whites who have affected relatives. Increased efforts need to be directed at identifying and managing underserved populations at increased risk for colon cancer based on their family histories.
Murff
Harvey J
HJ
Vanderbilt Epidemiology Center, Nashville, TN 37203-1738, USA. harvey.j.murff@vanderbilt.edu
Peterson
Neeraja B
NB
Fowke
Jay H
JH
Hargreaves
Margaret
M
Signorello
Lisa B
LB
Dittus
Robert S
RS
Zheng
Wei
W
Blot
William J
WJ
D000328:Adult; D001741:Black or African American; D003110:Colonic Neoplasms / Q000175:diagnosis* / Q000208:ethnology* / Q000235:genetics; D003113:Colonoscopy; D005190:Family; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D008297:Male; D008403:Mass Screening; D008875:Middle Aged; D012307:Risk Factors; D044465:White People