Since Liposomal Vincristine may prevent the body from making and/or keeping new blood cells, prior to treatment patients will also have a Human Immunodeficiency Virus (AIDS virus) test, a blood test to detect the presence of antibodies to the AIDS virus. A separate informed consent will be given to be signed, in order to obtain permission for this test. Female patients may also be required to have a urine pregnancy test before treatment may begin, as it is not known how the drug may affect the unborn child.