The present invention refers to a system for inducing an immune response against transformed, infected, or diseased tissue comprising a device for removing only components present in blood or plasma having a molecular weight of 120,000 daltons or less, having an inlet and outlet for connection to a pump and tubing to recirculate the blood or plasma of a patient through the device. Further, the present invention refers to methods of inducing an immune response against transformed, infected, or diseased tissue comprising administering to a patient blood, plasma, or a blood fraction from which only components having a molecular weight of 120,000 daltons or less have been removed, whereby administration of said blood, plasma, or blood fraction induces an immune response against transformed, infected, or diseased tissue in the patient until the transformed, infected, or diseased tissue is reduced in amount.
