FDA Raises Sabizabulin ‘Uncertainties’

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In advance of an 11/9 meeting of the FDA Pulmonary-Allergy Drugs Advisory Committee, FDA medical reviewers are raising several “uncertainties” about a Veru request for an emergency use authorization for its investigational prostate cancer drug VERU-111 (sabizabulin) as a treatment for hospitalized adults with moderate to severe Covid-19 who are at high risk for acute respiratory distress syndrome. The reviewers aired their concerns in a briefing document released before the meeting.

The paper says the reviewers acknowledge that the single study submitted by Veru met its prespecified primary endpoint of all-cause mortality at Day 60. They also noted that the study was quite small in size (204 patients) compared to other therapeutic programs for patients hospitalized with Covid-19.

The reviewers say the uncertainties with the trial data include:

  • high placebo group mortality rate;
  • potential for unblinding events with enteral tube administration;
  • baseline imbalances in standard-of-care therapies;
  • differences in hospitalization duration before trial enrollment;
  • uncertain effects of goals of care decisions on all-cause mortality;
  • negative studies with other microtubule disruptors in Covid-19; and
  • uncertainty in the identification of a clinically relevant patient population.

The agency is asking the advisory committee to:

  • discuss the all-cause mortality data and specifically address the extent to which the data could have been affected by the uncertainties raised by the reviewers;
  • discuss the level of concern with the limited size of the safety database for this new molecular entity; and
  • consider whether the known and potential benefits of VERU-111 when used to treat specific Covid-10 adult patients outweigh the known and potential risks.

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