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                <term xml:lang="en">hepatitis C virus DAAs</term>
                <term xml:lang="en">direct-acting antiviral agents SVR</term>
                <term xml:lang="en">sustained virological response</term>
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                <term xml:lang="en">Viral kinetics</term>
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                <term xml:lang="en">SVR</term>
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                <term xml:lang="en">hepatitis C virus</term>
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                <term xml:lang="en">direct-acting antiviral agents</term>
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              <p>Background &amp;amp; Aims: Recent clinical trials of direct-acting-antiviral agents (DAAs) against hepatitis C virus (HCV) achieved &amp;gt;90% sustained virological response (SVR) rates, suggesting that cure often took place before the end of treatment (EOT). We sought to evaluate retrospectively whether early response kinetics can provide the basis to individualize therapy to achieve optimal results while reducing duration and cost.Methods: 58 chronic HCV patients were treated with 12-week sofosbuvir + simeprevir (n = 19), sofosbuvir + daclatasvir (n = 19), or sofosbuvir + ledipasvir in three French referral centers. HCV was measured at baseline, day 2, every other week, EOT and 12 weeks post EOT. Mathematical modeling was used to predict the time to cure, i.e., &amp;lt;1 virus copy in the entire extracellular body fluid.Results: All but one patient who relapsed achieved SVR. Mean age was 60 ± 11 years, 53% were male, 86% HCV genotype-1, 9% HIV coinfected, 43% advanced fibrosis (F3), and 57% had cirrhosis. At weeks 2, 4 and 6, 48%, 88% and 100% of patients had HCV &amp;lt;15 IU/ml, with 27%, 74% and 91% of observations having target not detected, respectively. Modeling results predicted that 23 (43%), 16 (30%), 7 (13%), 5 (9%) and 3 (5%) subjects were predicted to reach cure within 6, 8, 10, 12 and 13 weeks of therapy, respectively. The modeling suggested that the patient who relapsed would have benefitted from an additional week of sofosbuvir + ledipasvir. Adjusting duration of treatment according to the modeling predicts reduced medication costs of 43–45% and 17–30% in subjects who had HCV &amp;lt;15 IU/ml at weeks 2 and 4, respectively.Conclusions: The use of early viral kinetic analysis has the potential to individualize duration of DAA therapy with a projected average cost saving of 16–20% per 100-treated persons</p>
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          <idno type="ROR">https://ror.org/002cp4060</idno>
          <orgName>Assistance Publique - Hôpitaux de Marseille</orgName>
          <orgName type="acronym">APHM</orgName>
          <desc>
            <address>
              <addrLine>Direction générale AP-HM80, rue Brochier13 354 Marseille Cedex 5</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">http://fr.ap-hm.fr/</ref>
          </desc>
        </org>
      </listOrg>
    </back>
  </text>
</TEI>