Age-related risk of mortality from bladder cancer in diabetic patients: a 12-year follow-up of a national cohort in Taiwan.
BACKGROUND
To compare bladder cancer mortality between diabetic patients and the general population.


METHODS
Yearly sex-specific mortality rates for age 25-64, 65-74, and > or =75 years in Taiwanese general population for 1995-2006 were calculated; 113,347 diabetic men and 131,573 diabetic women aged > or =25 years recruited in 1995-1998 were followed prospectively.


RESULTS
In the general population, 4,943 men and 2,291 women died of bladder cancer, and aging was associated with increased risk. Although the trend of crude mortality was increasing in either sex, the trend of age-standardized rates had been steady. The average crude and age-standardized mortality rates were 5.35 and 5.98 (per 100,000 population), respectively, for men; and were 2.63 and 3.02 for women. A total of 224 diabetic men and 126 diabetic women died of bladder cancer with crude mortality of 26.0 and 11.9 per 100,000 person-years, respectively. The relative risk of bladder cancer mortality (95% confidence interval) for diabetic patients was 2.18 (1.75-2.72), 2.50 (2.06-3.04), and 5.95 (4.57-7.74), in men, and 1.34 (0.96-1.89), 2.48 (1.92-3.19), and 7.44 (5.46-10.15), in women, for ages > or =75, 65-74, and 25-64 years, respectively.


CONCLUSIONS
Diabetic patients had a higher risk of bladder cancer mortality, which is more remarkable in the younger population.
Tseng
Chin-Hsiao
CH
Department of Internal Medicine, National Taiwan University College of Medicine, No. 7 Chung-Shan South Road, Taipei, Taiwan. ccktsh@ms6.hinet.net
Chong
Choon-Khim
CK
Tseng
Ching-Ping
CP
Chan
Ting-Ting
TT
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003922:Diabetes Mellitus, Type 1 / Q000150:complications / Q000401:mortality*; D003924:Diabetes Mellitus, Type 2 / Q000150:complications / Q000401:mortality*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012307:Risk Factors; D015996:Survival Rate / Q000639:trends; D013624:Taiwan / Q000453:epidemiology; D013997:Time Factors; D001749:Urinary Bladder Neoplasms / Q000150:complications / Q000401:mortality*