title: Changes in colorectal cancer over a 15-year period in a single United States city.
abstract: OBJECTIVE
  The aim of this study was to identify colorectal cancer trends in different patient groups in one region.
  
  
  METHODS
  We reviewed the records of all patients with colorectal cancer who were seen at two hospitals in Columbia, SC, between 1981 and 1995. Patients were divided into three 5-yr cohorts (cohort 1, 1981-1985; cohort 2, 1986-1990; and cohort 3, 1991-1995). We recorded demographic data, histological type, tumor stage, grade, and survival.
  
  
  RESULTS
  A total of 1395 patients were diagnosed, of whom 1252 had adenocarcinoma. Mean age of diagnosis was 64.5 yr in black and 66 in white patients (p = 0.036). Adenocarcinoma proximal to the splenic flexure was found in 62% of women and 49% of men (p < 0.001), and in 51% of black and 44% of white patients (p = 0.08). Proximal cancers accounted for 61%, 48%, and 32% of cohorts 1, 2, and 3, respectively. The proportions of patients with advanced stage (III and IV) adenocarcinoma in the three cohorts were 54%, 47%, and 40%, respectively (p = 0.001). Median survival for adenocarcinoma was 23.7, 23.5, and 23.1 months in cohorts 1, 2, and 3 (p = 0.9).
  
  
  CONCLUSIONS
  The prevalence and demographics of colorectal cancer have been fairly stable at this center. There has been a significant decrease in proximal cancers. Although adenocarcinoma is being diagnosed at an earlier stage, this has not affected survival. Colonoscopy may be the most appropriate screening method in women and in black patients, in whom proximal cancers are more often found.
authors.affiliation: University of Arkansas for Medical Sciences, Little Rock 72205-7199, USA.
authors.forename: V K
authors.initials: VK
authors.lastname: Sharma
authors.forename: R
authors.initials: R
authors.lastname: Vasudeva
authors.forename: C W
authors.initials: CW
authors.lastname: Howden
mesh_terms: D000230:Adenocarcinoma / Q000453:epidemiology*; D001741:Black or African American / Q000706:statistics & numerical data; D000368:Aged; D015331:Cohort Studies; D015179:Colorectal Neoplasms / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D012042:Registries / Q000706:statistics & numerical data; D013022:South Carolina / Q000453:epidemiology; D016019:Survival Analysis; D013997:Time Factors; D044465:White People / Q000706:statistics & numerical data