The present invention relates to the treatment of cancers. Specifically, the invention pertains to a method for the extracorporeal treatment of one or more body fluids (e.g., blood or cerebrospinal fluid, CSF) in two stages characterized by removing a body fluid (e.g., blood or CSF) from a living body diseased with a type of cancer, passing the body fluid through a first stage of applying a treatment to at least one antigen in the body fluid. More specifically, the treatment comprises creating an antibody-antigen moiety during passage thereof through said first stage, passing the treated body fluid through a second stage, removing antibody-antigen moiety from the body fluid during passage through the second stage, and returning the purified body fluid to the body.
