Patients 13 years of age or older who are on other primary NIH protocols with an invasive fungal infection 1) that does not respond to standard antifungal therapies; 2) for which there is no effective therapy; 3) who develop serious side effects from their current treatment; or 4) who have organ dysfunction that does not permit use of standard antifungal treatments may be eligible for this study. Candidates will be screened with a medical history, including a review of current and previous antifungal treatments, pregnancy test for women of childbearing potential, electrocardiogram (EKG), and detailed neurologic examination.