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Invasive Bladder Cancer

  Large-scale screening of people at high risk for developing invasive bladder cancer could result in earlier diagnosis and improved survival rates. Bladder cancer is the fourth most common cancer in men and the fifth most common cancer overall. In the early stages of the disease, it's common to have no signs or symptoms. Smoking has been proven to increase the risk of the disease. A new study by UT Southwestern Medical Center researchers sheds light on the challenges involved in identifying which high-risk population would benefit most from bladder-cancer screening.

Patients for the study were recruited from well-patient clinics at UT Southwestern and the Dallas Veterans Affairs Health Care System from March 2006 to November 2007. Those selected were over 50 years old, had smoked for 10 years or more, or had worked for 15 years or more in a high-risk occupation, such as in the dye, petroleum or chemical industries. Participants with other conditions that might lead to false-positive tests were excluded from the study.

Of the 1,502 participants, 85 tested positive for proteins that indicate the possible presence of a bladder tumor; 69 of those agreed to undergo cystoscopy. Only 2, however, were found to have noninvasive bladder cancer. The majority of these participants had undergone urinalysis within three years of screening. At the one-year follow-up, two more were found to have cancer, and these patients were over 60 and had more than 42 pack-years of smoking.

"We did expect to find more cases," Dr. Lotan said. "The significance is that even with high-risk patients, only a few had cancer. What that means is we need to find a higher-risk group either by increasing screening to over the age of 60 instead of 50 or looking at individuals with a longer smoking history." Dr. Lotan said that abstaining from or quitting smoking is the most effective way to prevent bladder cancer and that people should see a urologist immediately if they see blood in their urine.

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