Colorectal cancer incidence and survival among Alaska Natives, 1969-1993

Maureen O. Brown, Anne P. Lanier, Thomas Becker

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Background. Although colorectal cancer rates are low among most groups of Native Americans in North America, rates for Alaska Natives have been substantially elevated compared with US rates for all races combined. Methods. To better describe the epidemiology of colorectal cancer incidence and survival among Alaska Natives, stratified by gender and tribal/ethnic affiliation, we examined data collected by the Alaska Native Cancer Registry 1969-1993. We calculated age-adjusted and age-specific incidence as well as actuarial survival rates, and examined histological type, site, stage at diagnosis, and treatment. We compared these data to colorectal cancer data from whites living in western Washington. Results. In all, 587 colorectal cancer cases were identified among Alaska Natives over the 25-year period, for an age-adjusted annual incidence rate of 71.4/100,000 in women, and 69.3/100,000 in men. Compared to Alaska Indians, colon cancer rates were significantly higher in Aleuts (relative risk [RR] = 1.6, 95% CI:1.2-2.2) and in Eskimos (RR = 1.5, 95% CI:1.2-1.8), while rectal cancer rates did not differ by race/ethnicity. Alaska Natives experienced a 50% higher incidence rate of colorectal cancer overall compared to western Washington whites (RR = 1.5, 95% CI:1.3-1.6), although rectal cancer rates were similar in the two populations. The highest RR were seen among Alaska Native women; Aleuts and Eskimos had colon cancer rates more than twice that of western Washington white women. No unusual qualitative features were found in the cancers occurring in Alaska Natives. Actuarial colorectal cancer survival rates for Alaska Natives overall were 74% at one year and 42% at 5 years: these rates were very similar to those observed for the western Washington population. Both one and 5-year survival rates showed a significant trend towards improvement over time. Conclusions. Alaska Natives had substantially higher colorectal cancer incidence rates compared to western Washington whites. Rates were particularly high for Aleut and Eskimo women. These data suggest a need for intensified secondary prevention strategies for this high-risk population, while further research is needed to identify modifiable risk factors.

Original languageEnglish (US)
Pages (from-to)388-396
Number of pages9
JournalInternational Journal of Epidemiology
Volume27
Issue number3
DOIs
StatePublished - Jun 1998
Externally publishedYes

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Inuits
Colorectal Neoplasms
Survival
Incidence
Survival Rate
Rectal Neoplasms
Colonic Neoplasms
Population
Alaska Natives
North American Indians
North America
Secondary Prevention
Registries
Neoplasms
Epidemiology
Research

Keywords

  • Alaska Native
  • Colorectal neoplasms
  • Cross-cultural comparison

ASJC Scopus subject areas

  • Epidemiology

Cite this

Colorectal cancer incidence and survival among Alaska Natives, 1969-1993. / Brown, Maureen O.; Lanier, Anne P.; Becker, Thomas.

In: International Journal of Epidemiology, Vol. 27, No. 3, 06.1998, p. 388-396.

Research output: Contribution to journalArticle

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