Researchers found that a protein from a medicinal mushroom called Ganoderma microsporum can fight aggressive breast cancer by blocking a cellular pathway that helps cancer cells spread. The protein works by stopping the activation of key molecules (PI3K and Akt) that cancer cells use to invade surrounding tissues and migrate to other parts of the body. By blocking this pathway, the mushroom protein also prevents another molecule called β-catenin from entering the cell nucleus, where it would trigger genes that promote cancer growth and spread.