Racial differences in ill defined cancer mortality in the United States and in the District of Columbia.
OBJECTIVE
The aim was to examine the epidemiology of unknown primary cancer mortality in the USA during 1979 to 1988 by age, sex, race, year, and geographical area.


METHODS
National (US) and state data were abstracted for deaths due to ill defined cancer (ICD-9 195.0 to 199.1) and all cancers combined (ICD-9 140.0-209.9). Age adjusted mortality rates were calculated using the 1980 USA population as the standard, and standardised rate ratios were derived. National total cancer incidence data were obtained from the surveillance, epidemiology and end results (SEER) program, and age and sex specific relative (black/white) cancer incidence rates were derived and compared to relative (black/white) mortality rates for ill defined cancer. State and regional median family income levels were obtained from the 1980 census and compared to corresponding mortality rates.


METHODS
This study used data for the US population, the 50 states, and the District of Columbia.


RESULTS
During 1984-1988, ill defined cancers accounted for an average of 34,921 deaths each year in the USA (13.7 per 100,000 population). The mortality rate due to ill defined cancers is greater among blacks (19.3 per 100,000) than whites (13.2 per 100,000) (RR = 1.5) and has not declined since 1979. There is considerable geographical variation in the ill defined cancer mortality rate. Thus among blacks the highest rates were clustered in the central states (23 per 100,000) and the lowest rates were seen in the mountain and western states (17 per 100,000). The District of Columbia had the highest overall rate (21.7 per 100,000) when compared to all other states. The black/white relative mortality rate due to ill defined cancer was consistently greater than the black/white relative incidence of all cancers.


CONCLUSIONS
Ill defined cancer mortality is the fourth leading site of cancer mortality in the USA, and accounts for 7.4% of cancer deaths annually. The large proportion of ill defined cancer deaths may have biased the accuracy of national and local cancer incidence and mortality statistics. The higher mortality of ill defined cancer among blacks is not explained by the higher overall cancer incidence among blacks and suggests the influence of socioeconomic or cultural barriers that may result in underutilisation of health services or substandard health care. Ill defined cancer mortality may be a sentinel indicator of deficiencies in the health care delivery system as well as a measure of progress against cancer.
Schwartz
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Commission of Public Health, Bureau of Cancer Control, Washington, DC 20001.
Kofie
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VY
Sturgeon
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D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D044383:Black People; D004219:District of Columbia / Q000453:epidemiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009382:Neoplasms, Unknown Primary / Q000208:ethnology* / Q000401:mortality*; D014481:United States / Q000453:epidemiology; D044465:White People; D001741:Black or African American