PATIENT CHARACTERISTICS: Age: 13 and over Performance status: Not specified Hematopoietic: Not specified Hepatic: Not specified Renal: Creatinine no greater than 2.0 mg/dL Cardiovascular: No cardiac disease No clinically significant cardiac abnormality No ischemia No recent injury on EKG Other: No intolerance or unresponsiveness to rapamycin No hypersensitivity to macrolide antibiotics, e.g., erythromycin, azithromycin, clarithromycin No requirement for medications that may significantly affect rapamycin metabolism, i.e.: Carbamazepine Ketoconazole Primidone Cimetidine Nicardipine Rifampin Diltiazem Phenobarbital Valproic acid Erythromycin Phenytoin Verapamil No uncontrolled systemic infection No pregnant or nursing women Negative pregnancy test required of fertile women Effective contraception required of fertile patients during and for 3 months after study Able to tolerate less than 400 mL of liquid oral intake