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Major variation in bladder cancer subtype trends highlights need for focused research
Date:1/4/2012

Researchers are being urged to differentiate between two types of bladder cancer when they carry out studies, after a detailed trends analysis revealed significant differences between the main subtypes of the disease.

A major study of nearly 128,000 American bladder cancer cases, published in the January edition of the urology journal BJUI, shows that bladder cancer rates showed a 9% overall decrease between 1973 and 2007.

However, when the researchers looked at the two main subtypes, which accounted for 94% of the bladder tumours, they found that papillary transitional cell carcinoma (PTCC) increased by 56% over that period and non-papillary transitional cell carcinoma (NPTCC) fell by 53%.

"These two subtypes of bladder cancer are normally categorised as a single disease called transitional cell carcinoma in research studies, but our findings highlight major trend differences over more than three decades" says lead author Dr Yawei Zhang, from the School of Public Health and School of Medicine at Yale University, USA.

"This is a significant finding that underlines the importance of future research differentiating between these two subtypes."

Bladder cancer is the fifth most common cancer in the USA and is responsible for approximately 70,000 new cases and 15,000 deaths a year. Cigarette smoking and occupational exposure to arylamines organic chemicals is thought to account for more than half of the cases in the USA.

The research team used the National Cancer Institute's Surveillance and Epidemiology and End Results data for 1973-2007 to analyse trends in bladder cancer by subtype, disease stage and grade. This revealed the different trends between papillary tumours, that grow on the outside surface of the bladder, and non-papillary tumours, that grow on the inside of the bladder.

Key findings of the study included:

  • The statistics covered 127,614 first primary bladder c
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Contact: Annette Whibley
annette.wizard@gmail.com
Wiley-Blackwell
Source:Eurekalert

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