The median dosing interval was 10 days for TAC, and 1 day for CsA. Simulations demonstrated that subjects with a stable prestudy TAC Ctrough of 6 ng/mL, while receiving the Erlotinib molecular weight 3D with TAC 0.5 mg every 7 days or 14 days, would have TAC Ctrough in the range of 6-9 ng/ml and 2-4 ng/ml, respectively. Conclusions: For LT recipients with GT1 HCV infection receiving

3D, the recommended CSA or TAC dose modifications yielded concentrations within the therapeutic range. Disclosures: Prajakta Badri – Employment: Abbvie; Stock Shareholder: Abbvie Apurvasena Parikh – Employment: AbbVie Eoin Coakley – Employment: AbbVie; Stock Shareholder: AbbVie Walid Awni – Employment: AbbVie Sandeep Dutta – Employment: AbbVie; Stock Shareholder: AbbVie Rajeev Menon – Employment: AbbVie; Stock Shareholder: AbbVie The following people have nothing to disclose: Bifeng Ding Background: Enrollment of a significant proportion of patients with fibrotic liver disease in the ledipasvir/sofosbuvir (LDV/ SOF) Phase 3 program allowed for post-hoc

analyses of the impact of fibrosis stage determined by various methods on treatment response. Methods: Patients with liver biopsy and an MK0683 interpretable laboratory biomarker (FibroTest/FibroSure) results were pooled across three LDV/SOF Phase 3 clinical trials (ION-1, ION-2, and ION-3). FibroTest results were then mapped to Metavir Fibrosis Score in the following manner: 0-0.21 (F0); >0.21-0.31 (F1); >0.31-0.58 (F2); >0.58-0.72 (F3); >0.72-1.00 (F4). Differences in SVR12 rates according to fibrosis stage as determined by liver biopsy and laboratory biomarker are reported. Results: Of 1952 patients treated with a LDV/SOF-containing regimen, 986 (51%) had documentation of fibrosis stage by both liver biopsy (9% F0; 31% F1; 30% F2; 20% F3; 10% F4) and laboratory biomarker (8% F0; 6% F1; 27% F2; 23% F3; 36% F4). No difference in SVR12 was observed between patients with fibrosis stage as determined by liver biopsy (98% F0-F2; 上海皓元 97% F3; 96% F4) and those with fibrosis

determined by laboratory biomarker (99% F0-F2; 96% F3; 97% F4) (Figure 1). Conclusion: Ledipasvir/ sofosbuvir-based regimens are effective in genotype 1 infected patients irrespective of the degree of fibrosis or the method of fibrosis determination. Disclosures: Stuart C. Gordon – Advisory Committees or Review Panels: Tibotec; Consulting: Merck, CVS Caremark, Gilead Sciences, BMS, Abbvie; Grant/Research Support: Roche/Genentech, Merck, Vertex Pharmaceuticals, Gilead Sciences, BMS, Abbott, Intercept Pharmaceuticals, Exalenz Sciences, Inc. Michael W. Fried – Consulting: Genentech, Merck, Abbvie, Vertex, Janssen, Bristol Myers Squibb, Gilead; Grant/Research Support: Genentech, Merck, AbbVie, Vertex, Janssen, Bristol Myers Squibb, Gilead; Patent Held/Filed: HCCPlex Paul Y.