关于咖啡与膀胱癌关系的两篇科学文献

第一篇
http://www.ncbi.nlm.nih.gov/pubmed/24677003
结论：
Our findings suggest that coffee consumption may reduce the risk of PCa. No associations were found with both bladder and kidney cancer. Further well-designed large-scaled cohort studies are warranted to provide more definitive conclusions.

第二篇
http://www.ncbi.nlm.nih.gov/pubmed/22564775
结论：
Although data from case-control studies suggested that coffee was a risk factor for bladder cancer, there was no conclusive evidence on this association because of inconsistencies between case-control and cohort studies.

顺便说一下，这两篇文章的作者似乎都是华人。