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ENHANCED ANTIVIRAL EFFICACY FOR VALOPICITABINE (NM283) PLUS PEG-INTERFERON IN HEPATITIS C PATIENTS WITH HCV GENOTYPE-1 INFECTION: RESULTS OF A PHASE IIA MULTICENTER TRIAL
N. Afdhal, M. Rodriguez-Torres, E. Lawitz, E. Godofsky, G. Chao, B. Fielman, S. Knox, N. Brown
Background
Only 40-50% of HCV-1 infected hepatitis C patients respond to pegylated interferon (peg-IFNα) plus ribavirin therapy. NM283 is a novel nucleoside analog that as monotherapy reduced serum HCV RNA by a mean 1.2 log10 (94%) in a recent 15-day trial in HCV-1 patients, most of whom had previously failed antiviral therapy for HCV infection. NM107, the parent compound of NM283, and interferon alfa exhibit synergistic antiviral effects against BVDV models in vitro, prompting the current investigation of NM283 combined with peg-IFNα in treatment naïve patients with chronic hepatitis C.
Methods
A multicenter, open-label phase IIa trial is evaluating whether NM283 plus peg-IFNα-2b has enhanced antiviral activity compared to NM283 alone in HCV-1 infected patients. Key entry criteria are: HCV RNA >5 log10 IU/mL, ALT <5 xULN, compensated liver disease, treatment naïve. Eligible patients are randomized 2:3 to NM283 or peg-IFNα + NM283 (combinationRx). NM283 is dosed orally QD for 24 weeks in both groups, escalating to 800 mg/day over the first week and then continuing at that dose. The group randomized to combinationRx receives peg-IFNα-2b (1.0 μg/kg weekly) starting on Day 8.
Results
Presently 19 of 30 planned patients (age 22-65, 68% males) are enrolled and have received 10 or 12 weeks of treatment. Tolerance of both treatments has been satisfactory. Mean HCV RNA reductions (log10 IU/mL) from baseline to the last patient visit are 1.0 for the NM283 monotherapy group and 3.2 for the combinationRx group. Eleven of twelve combinationRx patients treated for at least 10 weeks have had substantial HCV RNA reductions (range 1.2-6.2 log10), and 8 of 12 patients have achieved >2 log10 decrease in HCV RNA, which has been associated with sustained response to current standard Rx. Presently 4 patients are PCR-negative (<10 IU/mL). 12-week early virological response data will be presented at the meeting.
Conclusions
NM283 combined with peg-IFNα shows consistent, rapid and marked anti-HCV activity in patients with HCV-1 infection, a historically difficult-to-treat group. Initial EVR rates with combinationRx are encouraging and support continued investigation of NM283 and NM283 + peg-IFNα, which may offer improved efficacy and tolerability for patients with HCV-1 infection
My son has cystic fibrosis and we've watch gene therapy trials that correct the cellular problem but then reverse back. Also this is a Phase II clinical trial that is testing a slightly larger group of patients for effectiveness and doseage tolerance. If it goes to Phase III there will be a much larger patient population enrolled and the outcome will determine if it gets a nod from the FDA for approval.
Daily Infergen seems to be kicking people's a** and I'm not choosing this route unless pressed. If NM283 goes clinical, I'm on it with or without INF.
New EASL news on NM283 out today at http://www.hivandhepatitis.com/2005icr/easl/docs/042205_a.html
"Week 12, patients receiving combination therapy had a mean reduction in HCV RNA levels of -3.01 log10 compared to -0.87 log10 in the valopicitabine monotherapy arm. At week 24, the 9 patients receiving combined therapy had a mean reduction of -4.5 log10 IU/mL. By Amplicor (LLOQ 600 IU/mL) and TaqMan (LLOQ 10 IU/mL) 8/9 and 6/9 subjects, respectively had undetectable HCV RNA.Those patients allocated to the combo arm who had detectable HCV RNA at week 12 experienced subsequent drops in their HCV RNA levels by week 24. Breakthroughs have not occurred in any patient."
I am right behind you. I take my last 3 ribaviron tonight and am through after 48 weeks. I was also clear at 12 weeks. It feels good to be through, but also scary. I look forward to feeling good again--whatever that was like. Now onto the dreaded wait for the 3 month PCR. Good luck to you and me.
Wouldn't you know this last week of tx 3 of those stupid dry patches developed on my forehead? Hadn't had those in 4 or 5 months. I am sure I have something in the drawer of pills, elixirs, creams, oils.............LOL