Fecha de publicación: 12/01/2023 Fuente: WIPO Rice The present invention relates to deoptimized Yellow Fever viruses and their uses for the treatment of various forms of malignant tumors, and as vaccines against Yellow Fever. The method of the present invention is particularly useful for the treatment of malignant tumors in various organs, such as: breast, skin, colon, bronchial passage, epithelial lining of the gastrointestinal, upper respiratory and genito-urinary tracts, liver, prostate and the brain.