 - Patients receiving the following medications at study entry or within the preceding 4 weeks are excluded: Agents with putative immunomodulating activity with the exception of non-steroidal anti-inflammatory agents, Allergy desensitization injections, Corticosteroids, administered parenterally or orally. Topical corticosteroids are acceptable. Any growth factors, Interleukin-2 or other interleukins. 