The role of various risk factors in living related donor renal transplant success.

Assessment of living related donor (LRD) survival statistics offers the opportunity to gauge the effects of recipient characteristics without the perturbations of viability, function, and antigen sharing that are inherent in cadaveric organ grafting. From January 1, 1969 to January 1, 1979, 167 LRD grafts were performed. Crude patient survival at one year is 92% and 84% at five years. Graft function at one year is 79%, and at five years it is 64%. One year patient survival has steadily improved: 1969-73: 83%, 1973-75: 91%, 1975-79: 98%. Graft survival improved during the first two periods and has since remained unchanged. HLA identical grafts showed the expected advantage compared with single haplotype grafts (93 vs 74%). Recipient age was without effect until 50 years, all younger subgroups having one-year patient survival of 92-95%, while those older than 50 had a one-year survival of 60%. Juvenile diabetes was associated with a one-year patient survival of 85% and graft survival of 74%. Glomerulonephritis did not affect early graft survival statistics, but there was a greater frequency of graft loss after 2.5 years, with function at five years of 51 versus 68% for recipients with all other diagnoses. Cadaveric graft statistics vary with recipient race when adjusted to exclude older patients and diabetics, white recipient one-year graft survival 74%, black 38%. No meaningful difference exists among LRD recipients as to graft function, but there is a trend toward improved black patient survival. This suggests that there is not an inherent difference in immune response to genetically similar grafts, but that the disparate results with racially mixed donor-recipient combinations rests with other factors.