Maitake, Shitake and oyster mushrooms  contains beta-glucan, which has been shown to possess antitumor activity. They have immunostimulant effects and activates natural killer cells, cytotoxic T-cells, interleukin-1, and superoxide anions. Preliminary research suggests that mushroom can prevent metastasis of experimentally induced tumors as well as prevent tumor occurrence in normal cells.
A unique recipe for mushroom soup that is thought to have beneficial effect in cancer care
is enclosed in the follwing link  -   Healthy Soup

Another recipe for Mushroom Soup

-Sun’s Soup
“Selected Vegetables” and “ Sun’s Soup ” are names given to several different mixtures of vegetables, mushrooms and herbs  that are being studied as treatments for cancer and other medical conditions