Thymoglobulin Induction Therapy in Kidney Transplantation (6mg/kg vs 4mg/kg)

Inclusion Criteria: * Male or female patients with renal failure from 18 to 70 years of age * Candidates for cadaveric or living donor kidney transplantation * Patients who are able and willing to consent the protocol of the study Exclusion Criteria: * Patients who have been receiving immunosuppressive therapy before transplantation * Patients who have received an investigational medication within the past 30 days * Patients who have a known contraindication to the administration of antithymocyte globulin * Patients who are suspected or known to have an infection or were seropositive for hepatitis B surface antigen (HBsAg), antibody against hepatitis B core antigen (anti-HBcAg), hepatitis C virus (HCV), or human immunodeficiency virus (HIV) * Patients who have had cancer (except non melanoma skin cancer) within the previous 2 years * Pregnant women, nursing mothers, and women of childbearing potential who were not using condoms or oral contraceptives