Treatment of Chronic Lymphocytic B-Leukemia With IL-2 and CD-40 Autologous Tumor Cells

Overview

This is a research study to determine the safety and dosage of special cells that may make the patients own immune system fight the cancer. To do this, we will put a special gene into cancer cells that have been taken from the patient. This will be done in the laboratory. This gene will make the cells produce interleukin 2 (IL-2), which is a natural substance that may help the immune system kill cancer cells. Additionally, we will stimulate the cancer cells with another natural protein called CD40 ligand (CD40L), which preclinical human and animal studies suggest will help IL-2 perform better. Some of these cells will then be put back into the body. The cells are grown with normal embryonic fibroblasts. Studies of cancers in animals and in cancer cells that are grown in laboratories suggest that combining substances like IL-2 and CD40L helps the body kill cancer cells. The purpose of this study is to learn the side effects and the safest effective dose of these special cells on the disease

Before starting treatment some of the cancer cells will be taken from the patient and separated in the laboratory. A specially produced human virus (adenovirus) that carries the IL-2 gene will be put into the cells. The rest of the cancer cells will be stimulated to express on their surface a substance called the human CD40 ligand. These substances (IL-2 and CD40L), already naturally present in the body, are meant to help the immune system fight the cancer. In this study, the modified cancer cells will be injected under the skin. There will be up to six shots. We do not know the best amount of special cells to use, so different patients will get different numbers of cells. After the first three shots (if more modified cancer cells are available), patients may be able to have three additional shots. After they have received six shots, they may be able to have additional shots if the cancer has gotten smaller and more of the cells are available. A complete history and physical examination is necessary before a patient can be enrolled in the study. A physical examination will also be performed weekly for ten weeks after the injection, then on week twelve, then monthly for one year. Patients will then have yearly checkups for the next fifteen years. After the first and second shots, we will remove some of the modified cells that have been injected under the skin, to study them. We will do this by removing a section of skin (referred to as a skin biopsy) at the place where the cells were injected. These tests will help us to see whether or not the modified cells are killing cancer cells and whether or not the cancer cells are growing. If we suspect the cancer cells are growing, we may repeat this procedure after the third and fourth shots. To study how the immunity is working in the patients system, we will take blood samples before the first injection, then weekly for 10 weeks, on week 12, once a month for a year, and then eventually once a year for fifteen years. These blood samples must be taken at The Methodist Hospital. The total amount of blood that will be obtained is approximately two to three tablespoonfuls, which is considered a safe amount. If the patient has additional injections, blood will be drawn prior to each injection. Additional office visits may be necessary. If the patient decides to withdraw at any time during the study both samples and data collected during the study will be maintained with identifiers for safety reasons.