The first 100 recipients of cadaveric renal allotransplants operated at our institution between 1964 and 1971 were retrospectively analyzed in terms of a long-term follow-up, complications and survival parameters. Patient and graft survival (indicated in parenthesis) after transplantation were 68% (58%) at 1 year, 50% (38%) at 5 years, 40% (27%) at 10 years, 32% (20%) at 15 years and 20% (13%) at 20 years. Half-life of graft survival was computed using two different mathematical models and was compared with the results of a control group operated in 1986. Half-life was 9.5 years for the study group and 13 years for the control group respectively.