Diabetes mellitus and kidney cancer risk: the results of Japan Collaborative Cohort Study for Evaluation of Cancer Risk (JACC Study).
BACKGROUND
Diabetes mellitus (DM) is reported as being a risk factor associated with kidney cancer in Western countries. The incidence of both kidney cancer and DM is lower in Japan than the other developed countries, albeit on the rise.


METHODS
We evaluated the risk factors for kidney cancer mortality using the database of the Japan Collaborative Cohort Study for Evaluation of Cancer Risk (JACC) study. The analytic cohort included 46 462 males and 64 326 females aged 40-79 years old. The Cox proportional hazards model was used to determine age- and sex-adjusted relative risk and its 95% confidence intervals.


RESULTS
DM showed an increased, age- and sex-adjusted hazard ratio for kidney cancer mortality, but it failed to achieve statistical significance after controlling for other factors.


CONCLUSIONS
The present study showed that DM increased the risk of kidney cancer death among the Japanese population. However, further studies may be needed to confirm the findings in the present study because DM failed to remain as a significant risk factor after controlling for other factors because of the small number of kidney cancer deaths in the present study.
Washio
Masakazu
M
Department of Public Health, Sapporo Medical University School of Medicine, Sapporo, Japan. washio@st-mary.ac.jp
Mori
Mitsuru
M
Khan
Mmh
M
Sakauchi
Fumio
F
Watanabe
Yoshiyuki
Y
Ozasa
Kotaro
K
Hayashi
Kyohei
K
Miki
Tsuneharu
T
Nakao
Masahiro
M
Mikami
Kazuya
K
Ito
Yoshinori
Y
Kubo
Tatsuhiko
T
Wakai
Kenji
K
Tamakoshi
Akiko
A
D048909:Diabetes Complications / Q000209:etiology*; D005260:Female; D006801:Humans; D007680:Kidney Neoplasms / Q000209:etiology*; D008297:Male; D018570:Risk Assessment; D012307:Risk Factors