Context Clinical surveys have revealed that incidental
detection of renal cell carcinoma is rising because of increased use of
imaging procedures.Objective To examine incidence, mortality, and survival trends of
renal cell and renal pelvis cancers by age, sex, race, and tumor stage
at diagnosis.Design Calculation of age-adjusted incidence and mortality rates,
along with 5-year relative survival rates, using data from the National
Cancer Institute's Surveillance, Epidemiology, and End Results (SEER)
program.Setting and Participants Patients diagnosed as having kidney
cancer from 1975 through 1995 in the 9 geographic areas covered by
tumor registries in the SEER program, which represent about 10% of the
US population.Main Outcome Measures Incidence, mortality, and 5-year relative
survival rates by time periods.Results The age-adjusted incidence rates for renal cell carcinoma
between 1975 and 1995 for white men, white women, black men, and black
women were 9.6, 4.4, 11.1, and 4.9 per 100,000 person-years,
respectively. The corresponding rates for renal pelvis cancer were 1.5,
0.7, 0.8, and 0.5 per 100,000 person-years. Renal cell cancer
incidence rates increased steadily between 1975 and 1995, by 2.3%
annually among white men, 3.1% among white women, 3.9% among black
men, and 4.3% among black women. Increases were greatest for localized
tumors but were also seen for more advanced and unstaged tumors. In
contrast, the incidence rates for renal pelvis cancer declined among
white men and remained stable among white women and blacks. Although
5-year relative survival rates for patients with renal cell cancer
improved among whites but not among blacks, kidney cancer mortality
rates increased in all race and sex groups.Conclusions Increasing detection of presymptomatic tumors by
imaging procedures, such as ultrasonography, computed tomography, and
magnetic resonance imaging, does not fully explain the upward incidence
trends of renal cell carcinoma. Other factors may be contributing to
the rapidly increasing incidence of renal cell cancer in the United
States, particularly among blacks.