Understanding HCV Treatment Failures with Sofusbuvir

While the new treatments for hepatitis C have improved dramatically in terms of cure rates and side effects (and pharmaceutical companies bottom-line), there are still patients who do not respond, especially those with genotype 3.  A recent study (Hepatology 2015; 61: 56-65) has provided some information into why this is happening.

A division of the FDA looked into five sofosbuvir (SOF) trials and performed sequencing to characterize potential resistance-associated substitutions.

Key findings:

  • Nonstructural protein 5B (NS5B) substitutions, L159F and V321A, emerged in 2.2%-4.4% of subjects who failed SOF treatment.
  • Baseline substitutions in 316 were associated with a reduced response in HCV genotype 1b subjects.
  • This study identified only 11 patients with genotype 3 with potentially relevant substitutions.

Bottomline: In the vast majority of patients, no resistance-associated substitution could be identified, indicating that we have a lot to learn why some patients are not responding.

Related blog posts:

Theses Eggs Contain Eggs!

Theses Eggs Contain Eggs!  Is the “allergen information” really necessary in this case?

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One thought on “Understanding HCV Treatment Failures with Sofusbuvir

  1. Pingback: An “Ally” For Hepatitis C Genotype 3 | gutsandgrowth

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