A clinical trial in France left one volunteer brain-dead and five others hospitalized, French officials said Friday, NBC News reported.
All volunteers participating in the trial at the privately-licensed laboratory in Rennes have been recalled and the country's Ministry of Health said an investigation has been launched into the incident.
French Health Minister Marisol Touraine was en route to Rennes on Friday and pledged to shed light on the circumstances of the tragedy, tthe ministry said in a statement.
It did not name the lab, saying only that the accident affected a Phase 1 trial of an oral drug.
France-based Biotrial later confirmed that "serious adverse events" related to a test drug had occurred "in some subjects" during a study for a sponsor, saying in a statement the company was in "close and regular contact" with French authorities.