The author experienced 8 cases of renal allograft in HLA-identical sibling pairs, out of which rejection was noted on 2 cases (25 %), but 5 years' actuarial graft survival rate was 100%.
According to the records the first year's graft survival rate is rainged from 85% to 100%, and in many cases rejection have occorred at a frequency of 40 % or over. Upon studies of these reports, an analysis revealed that there is a possibility of including rejections caused by mistypings and low-dose immunosuppressions.