Dictyophora dictyophora is the food with the highest selenium content. Dictyophora dictyophora 638μg selenium is recognized as an anti-cancer element, and it is called the "king of anti-cancer" among trace elements in human body by scientists. Scientific research has found that the level of blood selenium is closely related to the occurrence of cancer. A large number of survey data show that the selenium content in food and soil in a region is directly related to the incidence of cancer. For example, if the selenium content in food and soil in this region is high, the incidence and mortality of cancer will be low, on the contrary, the incidence and mortality of cancer in this region will be high. Facts show that selenium is closely related to the occurrence of cancer.