Association between expanded criteria for living kidney donors and renal biopsy findings

Background There are certain criteria for selecting living kidney donors. However, the association between clinical characteristics of these criteria and kidney biopsy findings in living kidney donors have not yet been elucidated. Thus, we investigated the association between kidney biopsy findings and clinical characteristics defined in the Japanese guidelines for living kidney donors. Methods A retrospective multicentre study was conducted on donors and their recipients who underwent kidney transplantation between July 2014 and June 2017. Multiple linear regression analysis and multiple logistic regression analysis were performed to investigate the association between biopsy findings and clinical characteristics. Results A total of 240 donors and 240 recipients were included. Age was significantly correlated with global glomerulosclerosis and intimal thickening in multiple linear regression analysis and multiple logistic regression analysis, whereas diabetes was correlated with tubular atrophy in multiple linear regression analysis after multiple imputation and multiple logistic regression analysis. Conclusions Amongst the clinical factors investigated in our study, age was positively correlated and diabetes was possibly correlated with kidney tissue injury in living kidney donors. Age and diabetes may be more important for selecting suitable living kidney donors than other clinical factors. Graphical Abstract