7. Serum creatinine of 1.5mg or less; creatinine clearance of 60ml/min or greater no more than 8 weeks prior to enrollment (Note: calculated creatinine clearance is permissible, using Cockcroft-Gault formula. If the creatinine clearance is greater than 60ml/min, then a serum creatinine of up to 1.8mg is allowable at the discretion of the principal investigator.)