This report extends the randomized, double-blind, multicenter trial at 14 c
enters in the United States that compared triple-therapy regimens containin
g mycophenolate mofetil (MMF), 2 or 3 g, with a similar regimen containing
azathioprine (AZA) in recipients of cadaveric renal allografts. We investig
ated the continued long-term use of MMF with respect to graft and patient s
urvival, graft function, and safety. All patients who received the study dr
ug (MMF, 2 g, n = 165; MMF, 3 g, n = 166; AZA, n = 164) were included in th
e 3-year intent-to-treat evaluation of graft and patient survival. At 3 yea
rs posttransplantation, the weighted pairwise difference was 6.5%, and 95%
confidence interval in graft and patient survival tie, patients alive with
a functioning graft) was -2.1 to 15.1 (P = 0.17) numerically in favor of MM
F, 2 g, compared with AZA. Similar to the 1-year data, the principal advers
e events were limited to the gastrointestinal and hematologic systems. Alth
ough cytomegalovirus (CMV) tissue-invasive disease occurred more often in t
he MMF-treated groups, most instances occurred during the first year posttr
ansplantation. One patient in the AZA group and one patient in the MMF 2-g
group developed lymphoma, whereas three patients in the MMF 3-g group devel
oped lymphoma at 3 years posttransplantation. In conclusion, although the d
esign of the study did not afford adequate statistical power to address sur
vival end points, at 3 years posttransplantation, graft survival, patient s
urvival, renal function, and safety were similar among the AZA, MMF 2-g, an
d MMF 3-g groups. There was an increased incidence of infection caused by i
nvasive CMV and Aspergillus spp and mucormycosis seen in the MMF groups, bu
t the long-term data confirm MMF is a safe and valuable addition to the ran
ge of drugs available to prevent rejection. (C) 1999 by the National Kidney
Foundation, Inc.