title: Quantitative survival model for short-term survival after adult-to-adult living donor liver transplantation.
abstract: Adult-to-adult living donor liver transplantation (ALDLT) has been accepted as an important option for end-stage liver disease, but information regarding the risk factors remains fragmentary. We aimed to establish a predictive model for 90-day survival. In the first step, a total of 286 cases who had received primary ALDLT using a right lobe graft between 1998 and 2004 were randomly divided into 2 cohorts at a ratio of 2:1 (191 vs. 95 recipients). The larger cohort of patients was used to develop a model. The outcome was defined as 90-day survival, and a total of 39 preoperative and operative variables, including the period of surgery (1998-2001 vs. 2002-2004), were included using Cox's proportional hazard regression model. Two mismatches of human leukocyte antigen (HLA) type DR (hazard ratio [HR] = 4.45; confidence interval [CI] = 1.96-10.1), log(e)[blood loss volume] (HR = 2.43; CI = 1.64-3.60), period of surgery (1998-2001 vs. 2002-2004) (HR = 2.41; CI = 1.04-5.57), and log(e)[serum C-reactive protein or CRP] (HR = 1.64; CI = 1.13-2.38) were found to be independent risk factors. In the second step, we tried to establish a realistic survival model. In this step, we created 2 models, 1 that used all 4 variables (model 1) and 1 (model 2) in which blood loss volume was replaced with the past history of upper abdominal surgery and Model for End-Stage Liver Disease (MELD) score (> or =25), both of which showed associations with blood loss volume. These models were applied to the smaller cohort of 95 patients. Receiver operating characteristic analyses demonstrated that both models showed similar significant c-statistics (0.63 and 0.62, respectively). In conclusion, model 2 can provide a rough estimation of the 90-day survival after ALDLT.
authors.affiliation: Department of Transplantation and Immunology, Kyoto University, Kyoto, Japan.
authors.forename: Ichiro
authors.initials: I
authors.lastname: Tsunematsu
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Ogura
authors.forename: Kayoko
authors.initials: K
authors.lastname: Inoue
authors.forename: Akio
authors.initials: A
authors.lastname: Koizumi
authors.forename: Nobuhiko
authors.initials: N
authors.lastname: Tanigawa
authors.forename: Koichi
authors.initials: K
authors.lastname: Tanaka
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D016031:Liver Transplantation; D019520:Living Donors; D008297:Male; D008875:Middle Aged; D008954:Models, Biological; D013534:Survival / Q000502:physiology*