Creatinine no greater than the institutional upper limits of normalXx_NEWLINE_xXSerum sodium and potassium within the institutional limits of normal, within 14 days of registration and within 7 days of the start of treatmentXx_NEWLINE_xXCreatinine =< 2 x institutional upper limits of normalXx_NEWLINE_xXPatients must have serum creatinine =< 2 x institutional upper limits of normal (IULN) within 7 days prior to registrationXx_NEWLINE_xXCreatinine within normal institutional limits ORXx_NEWLINE_xXCardiac function within institutional normal limits on echocardiogramXx_NEWLINE_xXBilirubin =< 2.0 x upper limits of normal (ULN)Xx_NEWLINE_xXWithin 14 days of registration: Bilirubin =< 1.5 x upper limits of normal (ULN)Xx_NEWLINE_xXCreatinine within normal institutional limits ORXx_NEWLINE_xXSerum bilirubin =< 1.5 x institutional upper limits of normal (ULN); must be obtained within 28 days prior to registrationXx_NEWLINE_xXThyroid stimulating hormone (TSH) within institutional limits (ie: normal); if TSH is greater or less than institutional limits patients may participate if their T4 is within normal limits (WNL); patients may be on a stable dose of replacement thyroid medication; dose adjustments are allowed if neededXx_NEWLINE_xXCreatinine within normal institutional limitsXx_NEWLINE_xX