After reviewing this paper, I asked what influence genetic risk  factors 
played. The response indicated that genetic factors were not included in 
the analysis.
Without benefit of the full paper, this document's abstract was quoted 
in a number of health-related websites and yet, the results mean 
virtually nothing. 
Sandi

------------------------------------------------------------------------

' 2005 Wiley-Liss, Inc.
Int. J. Cancer: 117, 300-307 (2005)

Physical activity and the risk of ovarian cancer: A case-control study 
in Canada
Sai Yi Pan1*, Anne-Marie Ugnat1, Yang Mao1 and The Canadian Cancer 
Registries Epidemiology Research Group
Surveillance and Risk Assessment Division, Centre for Chronic Disease 
Prevention and Control,
Public Health Agency of Canada, Ottawa, Ontario, Canada


"Our questionnaire was not validated. Self-reported physical activity 
assessment is commonly used in large-scale epidemiologic studies due to 
its economy and easy administration. However, extensive validation of 
self-reported physical activity questionnaires has not been conducted, 
in part because of a lack of
acceptable criterion to determine the validity. Two studies suggested 
that self-administered physical activity questionnaires are reproducible 
and provide useful measure of physical activity with reasonable 
validity.55,56
In conclusion, our population-based study observed a reduced risk of 
ovarian cancer among women engaged in higher levels of moderate but not 
vigorous recreational physical activity. The reduction associated with 
recreational activity was similar among premenopausal and postmenopausal 
women; however, a significant
decrease in risk was observed for serous, endometrioid and other but not 
mucinous histologic types of ovarian tumors. The results from one 
province also suggested that occupational activity afforded protection 
again ovarian cancer across various life periods."


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