Abstract: The present application relates to a method for enhancing the therapeutic index of a compound that is useful to treat tumors. More specifically, the present invention relates to a method for administering IL-2 to a tumor patient to maximize the therapeutic efficacy and minimize the toxicity.

Abstract: An optical interferometer system is described which precisely measures the angle of rotation of a mirrored surface about a desired axis of rotation without sensitivity to rotation of the surface about an axis perpendicular to the desired axis of measurement. Measurements of the angle or position of a surface are made without attaching any optical or other components to the surface. In operation, a laser beam is passed through a beam splitter which provides two secondary beams. Each of the beams is then passed through a respective optical assembly, each of which is essentially a mirror image of the other. Each of the optical assemblies comprises a unique combination and arrangement of optics which provides a folded optical path wherein the laser beam passes through the system optics and is reflected multiple times by the mirror being measured. Each of the beams then passes back through its respective optical section and is detected by optical means.