© 2003 by the American Diabetes Association, Inc.
Mortality From Site-Specific Malignancies in Type 2 Diabetic Patients From Verona
1 Unit of Epidemiology and Medical Statistics, University of Verona, Verona, Italy OBJECTIVE The aim of the present work was to compare mortality from site-specific malignancies in type 2 diabetic patients with those in the general population. RESEARCH DESIGN AND METHODS Mortality from site-specific cancers was assessed in a population-based cohort of 7,148 type 2 diabetic patients from Verona (Northern Italy) during a 10-year follow-up (19871996) by reviewing death certificates. Standardized mortality ratio (SMR) data were computed using as reference mortality rates in the general population of Verona. RESULTS During follow-up, 641 patients (378 men and 263 women) died of malignancies. The most common causes of death among site-specific malignancies were digestive tumors both in men (140 of 378, 37.0%) and women (105 of 263, 39.9%), respiratory tumors in men (103 of 378, 27.2%), and tumors of the reproductive system in women (79 of 263, 30.0%). A slight increase in the overall mortality from malignancies was observed in diabetic patients and achieved statistical significance in women (observed/expected = 1.16, 95% CI 1.021.30; P = 0.019) but not in men (observed/expected = 1.07, 0.971.19; P = 0.163). Excess mortality from hepatic cancer (SMR = 1.86, 1.442.38) was observed in both men and women. In addition, women with diabetes experienced a higher mortality from pancreatic tumors (observed/expected = 1.78, 1.132.67) and breast tumors (observed/expected = 1.40, 1.061.81). Excess mortality from breast cancer was confined to obese women with diabetes. CONCLUSIONS Mortality from site-specific malignancies is different in type 2 diabetic patients than in the general population. Better control of body weight seems necessary to prevent the excess mortality from breast cancer in women.
Abbreviations: SMR, standardized mortality ratio
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