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210A AASLD ABSTRACTS HEPATOLOGY, October, 2015 sis, factors predicting treatment failure were pre-treatment AFP >1000 ng/mL (HR 3.3, p1000 ng/mL compared to 40% for AFP
HEPATOLOGY, VOLUME 62, NUMBER 1 (SUPPL) AASLD ABSTRACTS 211A and Status 1A FHF patients may be over-prioritized according to current allocation policies. Disclosures: W. Ray Kim - Advisory Committees or Review Panels: Bristol Myers Squibb, Gilead Sciences, Abbvie, Merck Patrick S. Kamath - Advisory Committees or Review Panels: Sequana Medical The following authors have nothing to disclose: Alina M. Allen, Julie Heimbach, Joseph J. Larson, Terry M. Therneau 7 End Stage Liver Disease Patients with MELD Scores Over 40 Have Significantly Higher Waitlist Mortality and Lower Probability of Receiving Liver Transplantation Compared to Status 1A Fulminant Hepatic Failure Patients Joseph C. Ahn 2 , Taft Bhuket 1 , Sasan Mosadeghi 1 , Catherine T. Frenette 3 , Benny Liu 1 , Robert J. Wong 1 ; 1 Gastroenterology and Hepatology, Alameda Health System - Highland Hospital, Oakland, CA; 2 School of Medicine, University of California, San Francisco, San Francisco, CA; 3 Organ Transplantation, Scripps Green Hospital, San Diego, CA Background: Current liver transplantation (LT) allocation systems prioritize Status 1A patients with fulminant hepatic failure (FHF) over end stage liver disease (ESLD) patients of all MELD scores. However, ESLD patients with the highest MELD scores may have higher waitlist mortality than Status 1A FHF patients, and thereby may require LT more urgently. Aim: Evaluate differences in LT waitlist mortality and probability of LT between Status1A FHF patients and ESLD patients with MELD>30. Methods: Using data from United Network for Organ Sharing registry, we retrospectively evaluated U.S. adults (age > 18) who were listed for LT from January 1, 2003 to December 31, 2013. ESLD patients were stratified into 3 groups of MELD scores (31- 35, 36-40, > 40). Overall waitlist mortality and probability of LT were stratified by ESLD vs. Status 1A FHF and evaluated with Kaplan Meier curves and multivariate logistic regression models. The final multivariate model included adjustments for age, sex, race/ethnicity, obesity, hepatic encephalopathy, and ascites. Results: From 2003-2013, 15,049 ESLD patients with MELD>30 and 3,049 Status 1A FHF patients were listed for LT. ESLD patients with MELD 31-35 and MELD 36-40 had significant higher 28-day waitlist survival than Status 1A FHF patients, whereas MELD >40 patients had similar 28-day survival. Compared to Status 1A FHF patients, overall probability of LT was similar among ESLD patients with MELD 36-40 and MELD>40. On multivariate regression, compared to Status 1A FHF, ESLD patients with MELD scores >40 had significantly higher 14-day waitlist mortality (OR 1.92; 95% CI 1.56-2.36; p40 have significantly higher waitlist mortality compared to Status 1A FHF patients. Despite the higher waitlist mortality, ESLD patients with MELD >40 had similar probability of receiving LT, suggesting that these patients may be under-prioritized Disclosures: Catherine T. Frenette - Speaking and Teaching: Bayer, Salix, Gilead; Stock Shareholder: Gilead The following authors have nothing to disclose: Joseph C. Ahn, Taft Bhuket, Sasan Mosadeghi, Benny Liu, Robert J. Wong 8 Enhancing hepatocyte function using an advanced microfluidic system for clinical and pharmaceutical applications Maria Navarro-Zornoza 1,2 , Xavi Illa 2 , Carmen Peralta 3 , Rosa Villa 2 , Jordi Gracia-Sancho 1 ; 1 Barcelona Hepatic Hemodynamic Lab, IDIBAPS - Hospital Clinic de Barcelona - CIBEREHD, Barcelona, Spain; 2 CNM-CSIC, Barcelona, Spain; 3 IDIBAPS - CIBEREHD, Barcelona, Spain Background and Aims: Development of an advanced liveron-a-chip to support liver function in patients with acute liver failure and for in vitro drug discovery is still challenging. We hypothesized that representation of the unique architectural and dynamic features of the hepatic sinusoid using a superior microfluidic bioreactor system for co-culture of primary liver sinusoidal endothelial cells (LSECs) and hepatocytes would mimic the in vivo hepatic metabolism significantly better than using conventional methods for hepatocytes mono-culture or co-cultures. Methods: Hepatocytes and LSECs freshly isolated from Wistar rats were co-cultured in a bioreactor recently developed by our team. LSECs were grown in the upper area of the bioreactor on a 1mm pore size membrane with homogeneous and continuous shear stress stimulation (3dyn/cm 2 ); whereas hepatocytes were plated in the lower area. After 48-72h of co-culture, hepatocyte function and phenotype were characterized as albumin synthesis (enzymatic method), urea production (BUN enzymatic method), CYP3A4 (luminescence assay) and HNF4a expression (qPCR), and compared to hepatocytes co-cultured with LSECs in the microfluidic system but under static conditions or in conventional transwells, and with hepatocytes cultured alone. Results: Hepatocytes co-cultured in the bioreactor exhibited markedly better phenotype than those cultured using conventional methods. Indeed, hepatocytes from the bioreactor maintained polygonal shape differentiation, had higher albumin and urea production (Albumin: 67-fold higher vs. transwells; 108-fold vs. mono-cultures; Urea: 79-fold superior vs. transwells; 108-fold vs. mono-cultures), exhibited markedly higher HNF4a expression (17-fold vs. transwells; 12-fold vs. mono-cultures), and superior CYP3A4 activity (28-fold vs. transwells; 17-fold vs. mono-cultures). All differences were p
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1000A AASLD ABSTRACTS HEPATOLOGY, O
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1312A AUTHOR INDEX HEPATOLOGY, Octo
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1366A CATEGORY INDEX HEPATOLOGY, Oc
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