According to results of a study, selenium intake is associated with decreased risk of bladder cancer.
Selenium is an essential micronutrient found in about 25 proteins. Most of these so-called selenoproteins are enzymes with antioxidant properties. The main dietary sources of selenium are plant foods grown in selenium-rich soils and animals who graze on such plants.
According to Eurekalert:
“The researchers noted a significant protective effect of selenium, mainly among women, which they believe may result from gender-specific differences in the mineral's accumulation and excretion in women.”