SummaryAt least subjective results are obtained in patients with epithelial tumors by Use of thiodiglycol, a product of hydrolysis of dichlorethyl sulfur.In some cases a decrease of the size of the tumor has been observed.Thiodiglycol does not have the toxic properties of Nitrogen mustard. It does not act as a poison of the cell nor as a mitotic poison and does not influence systemic tumors such as lymphona, leukemia.The mode of action of thiodiglycol is rather hypothetical. May be it increases the sensitivity of neoplasic tissue to some other therapeutic agents or to some hormonal component concerned in anticancerous defense.