Skip to content

Cancer Health Center

Font Size
A
A
A

Kidney Cancer on the Rise

Improved Detection, Obesity Epidemic May Play Role, Researchers Say
By
WebMD Health News
Reviewed by Laura J. Martin, MD

Feb. 23, 2011 (Orlando) -- The number of people with kidney cancer in the U.S. has risen steadily since 1975 and, since 1991, the greatest increase has been among younger people, researchers report.

From 1975 to 1990, the number of new cases increased on average by 3.6% annually, says study leader Kenneth G. Nepple, MD, a fellow in urologic oncology at Washington University in St. Louis.

From 1991 to 2006, cases rose on average by 2.9% per year, he says.

Cases increased in all age groups from 1975 to 2006, Nepple tells WebMD. But the proportion of patients diagnosed when they were younger than age 65 increased from 45.9% in 1991 to 55.3% in 2006, he says.

Some of the rise comes from increased detection on CT scans, says Christopher G. Wood, MD, professor of urology at the University of Texas M.D. Anderson Cancer Center in Houston.

"A person comes to the emergency department with a [general] complaint such as belly ache and is given a CT scan. A small kidney cancer that might have gone unnoticed is detected," he tells WebMD.

But that can't explain the trend entirely, because the rise in cases began before use of CT scans started skyrocketing in the 1980s, Wood says.

Kidney Cancer on Rise: Why?

"Some of the increase in cases is real. We're not yet sure why the numbers continue to go up, but we think exposures to environmental factors such as smoking and other carcinogens add up and play a causative role," he says. Wood was not involved with the study.

Nepple says he suspects the epidemic of obesity is also helping to fuel the increase.

The researchers used data from the National Cancer Institute's Surveillance, Epidemiology, and End Results cancer registry database to look at renal cancer trends from 1975 to 2006. The database covers about one-fourth of the U.S. population, Nepple says.

Other findings:

  • In people aged 20 to 39, new kidney cancer cases rose on average from 4.5% annually during 1975-1990 to 5.2% during 1991-2006.
  • In contrast, among people older than 79, annual new cases dropped on average from 6.7% in 1975 to 1990 to 0.9% in 1991 to 2006.
  • Overall, there were 7.4 new cases of kidney cancer per 100,000 adults in 1975 vs. 17.6 per 100,000 adults in 2006.

The study was presented at the Genitourinary Cancers Symposium.

These findings were presented at a medical conference. They should be considered preliminary as they have not yet undergone the "peer review" process, in which outside experts scrutinize the data prior to publication in a medical journal.

Today on WebMD

Colorectal cancer cells
A common one in both men and women.
Lung cancer xray
See it in pictures, plus read the facts.
 
sauteed cherry tomatoes
Fight cancer one plate at a time.
Ovarian cancer illustration
Do you know the symptoms?
 
Jennifer Goodman Linn self-portrait
Blog
what is your cancer risk
HEALTH CHECK
 
colorectal cancer treatment advances
Video
breast cancer overview slideshow
SLIDESHOW
 
prostate cancer overview
SLIDESHOW
lung cancer overview slideshow
SLIDESHOW
 
ovarian cancer overview slideshow
SLIDESHOW
Actor Michael Douglas
Article