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464A AASLD ABSTRACTS HEPATOLOGY, October, 2015<br />

ERK1/2 were more robustly activated in RA-primed regenerating<br />

livers than controls. Conclusion: Priming mice with RA<br />

resulted in a lean microbiota composition and hydrophilic bile<br />

acid profile, which are associated with facilitated metabolism<br />

and enhanced cell proliferation.<br />

Disclosures:<br />

The following authors have nothing to disclose: Hui-Xin Liu, Ying Hu, Lili Sheng,<br />

Yu-Jui Yvonne Wan<br />

509<br />

Pre-operative plasma glypican-3 levels detected by a<br />

novel ELISA system predict the risk of post-operative<br />

recurrence in patients with stage I hepatocellular carcinoma<br />

Kazuya Ofuji 1,2 , Keigo Saito 1 , Yasunari Nakamoto 2 , Tetsuya<br />

Nakatsura 1 ; 1 Division of Cancer Immunotherapy, Exploratory<br />

Oncology Research and Clinical Trial Center, National Cancer<br />

Center, Kashiwa, Japan; 2 Second Department of Internal Medicine,<br />

University of Fukui, Fukui, Japan<br />

Background: Prognosis of post-operative hepatocellular carcinoma<br />

(HCC) patients remains unsatisfactory due to the high<br />

risk of recurrence. Glypican-3 (GPC3) is specifically overexpressed<br />

in HCC and has been recognized as a novel prognostic<br />

factor after curative resection of HCC. Recent <strong>studies</strong><br />

have shown the usefulness of GPC3 as a biomarker for the<br />

diagnosis of early HCC. However, the diagnostic value of<br />

GPC3 as a predictive marker for recurrence of postoperative<br />

early-stage HCC remains unclear. Here, this study was undertaken<br />

to evaluate the detection of plasma GPC3 using a novel<br />

sandwich enzyme-linked immunosorbent assay (ELISA) system<br />

in early-stage HCC patients after surgical resection. Methods:<br />

Plasma samples were collected from 25 patients with stage<br />

I HCC who underwent for surgical resection between 2008<br />

and 2010. The ELISA system for detection of plasma GPC3<br />

levels was established, by use of a newly-generated anti-GPC3<br />

mouse monoclonal capture antibody and a biotinylated detection<br />

antibody and recognized with streptavidin-conjugated<br />

horseradish peroxidase. GPC3 expression of surgical specimens<br />

was analyzed by immunohistochemical staining. Results:<br />

HCC recurrence was observed in 14 cases after surgical resection<br />

(51.8%) during follow-up period (median, 738 days).<br />

In the immunohistochemical analysis, GPC3 positive rate of<br />

resected specimen was 53% (13/23). There was a tendency<br />

towards a shorter recurrence-free survival (RFS) in GPC3 positive<br />

cases than in GPC3 negative cases (p 0.233). In the ELISA<br />

system, the mean ± standard deviation (SD) of plasma GPC3<br />

concentrations was 110.12 ± 37.70 ng/ml in control subjects,<br />

and cut-off value was determined to be 132 ng/ml (mean +<br />

1.5 SD). In stage I HCC, the sensitivity and specificity were<br />

40.7% and 92%, respectively. GPC3-positive rate at the time<br />

of recurrence was 64.3%. In the recurrence group, pre-operative<br />

plasma GPC3 levels were significantly higher than in the<br />

non-recurrence group (median, 191.7 ng/ml vs 29.7 ng/ml,<br />

p = 0.029). There was a tendency of shorter RFS in the pre-operative<br />

plasma GPC3-positive patients group compared with<br />

the negative group (median RFS, 769 days vs. not reached,<br />

p = 0.147). However, there was no significant difference in<br />

overall survival. The recurrence rate of patients with post-operative<br />

plasma GPC3 positive was significantly higher than<br />

GPC3 negative patients (p = 0.012). Conclusions: We have<br />

established a novel ELISA system for detecting plasma GPC3<br />

levels and evaluated the utility of GPC3 as a diagnostic marker<br />

of HCC. This study suggests pre-operative plasma GPC3 levels<br />

may help in identification of stage I HCC patients at high risk<br />

of post-operative recurrence.<br />

Disclosures:<br />

Tetsuya Nakatsura - Consulting: Ono Pharmaceutical co.Ltd.; Grant/Research<br />

Support: Ono Pharmaceutical co.Ltd., MEDINET co.Ltd., Sysmex co. Ltd.<br />

The following authors have nothing to disclose: Kazuya Ofuji, Keigo Saito, Yasunari<br />

Nakamoto<br />

510<br />

Evaluation of Glyoxylate and Hydroxyproline Metabolic<br />

Pathways Through the Use of Dicer-Substrate Small<br />

Interfering RNA<br />

Nicole Avitahl-Curtis 1 , Benjamin Holmes 1 , Luciano Apponi 2 , Rohan<br />

Diwanji 1 , Marita S. Larsson Cohen 2 , Chaitali Dutta 1 , Natalie W.<br />

Pursell 1 , Dongyu Chen 2 , Xue Shui 2 , Purva Pandya 2 , Utsav H.<br />

Saxena 2 , Martin Koser 2 , Abrams Marc 2 , Weimin Wang 2 , Hank<br />

Dudek 2 , Chengjung Lai 1 , Bob D. Brown 2 ; 1 Translational Biology,<br />

Dicerna Pharmaceuticals, Inc., Cambridge, MA; 2 Dicerna Pharmaceuticals,<br />

Inc., Cambridge, MA<br />

Primary Hyperoxaluria (PH) results from genetic mutations<br />

which affect glyoxylate metabolism, causing overproduction<br />

of oxalate. Three types of Primary Hyperoxaluria have been<br />

described to date, and the genetic lesions underlying disease<br />

have been identified. PH1, PH2 and PH3 are caused by mutations<br />

in the genes, AGXT, GRHPR and HOGA1, respectively,<br />

which encode the metabolic enzymes alanine: glyoxylate<br />

aminotransferase (AGT), glyoxylate reductase (GRHPR), and<br />

4-hydroxy-2-oxoglutarate adolase (HOGA). The roles of AGT<br />

and GRHPR in glyoxylate metabolism have been explored utilizing<br />

mouse strains harboring a germline disruption of the<br />

Agxt or Grhpr gene. Agxt- and Grhpr-deficient mice develop<br />

hyperoxaluria, consistent with the proposed roles of AGT and<br />

GRHPR in glyoxylate metabolism. Dicer-substrate siRNAs (DsiR-<br />

NAs) are potent and specific RNAi triggers that inhibit the<br />

expression of disease-relevant targets at the mRNA level, and<br />

are currently in clinical development. In this work, we describe<br />

the use of DsiRNAs to silence the expression of Agxt and Grhpr<br />

in mice to generate PH1 and PH2 animal models that phenotypically<br />

mimic Agxt- and Grhpr-deficient mice. DsiRNA-induced<br />

PH disease models were further explored for their utility<br />

to identify effective therapeutics. This approach was also used<br />

to investigate the dysregulation of the glyoxylate and hydroxyproline<br />

metabolic pathways occurring in each type of primary<br />

hyperoxaluria. Finally, we describe the utility of siRNA as an<br />

efficient and powerful method for generating models of liver<br />

disease in rodents and, potentially, other species.<br />

Disclosures:<br />

Nicole Avitahl-Curtis - Employment: Dicerna Pharmaceuticals, Inc.<br />

Benjamin Holmes - Employment: Dicerna Pharmaceuticals; Stock Shareholder:<br />

Dicerna Pharmaceuticals<br />

Luciano Apponi - Employment: Dicerna Pharmaceuticals<br />

Rohan Diwanji - Employment: Dicerna Pharmceuticals; Stock Shareholder:<br />

Dicerna Pharmceuticals<br />

Chaitali Dutta - Employment: Dicerna Pharmaceuticals<br />

Utsav H. Saxena - Employment: Dicerna Pharmaceuticals<br />

Martin Koser - Employment: Dicerna Pharmaceuticals<br />

Abrams Marc - Employment: Dicerna Pharmaceuticals<br />

Hank Dudek - Employment: Dicerna<br />

Chengjung Lai - Employment: Dicerna Pharmaceuticals<br />

Bob D. Brown - Employment: Dicerna Pharmaceuticals<br />

The following authors have nothing to disclose: Marita S. Larsson Cohen, Natalie<br />

W. Pursell, Dongyu Chen, Xue Shui, Purva Pandya, Weimin Wang

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