Don’t License Mesoblast’s Ryoncil: Petition
An unnamed client represented by Lassman Law & Policy is asking FDA not to issue a BLA to Mesoblast for its Ryoncil (remestemcel-L) (ex-vivo culture-expanded adult human mesenchymal stromal cells suspension for intravenous infusion) to treat pediatric patients with steroid-refractory acute graft-versus-host disease (aGVHD). The petition expresses concern that the data submitted in the BLA to establish effectiveness fails to meet the rigorous standards necessary to qualify as “substantial evidence” of effectiveness under the Public Health Service Act and FDA policies.
It asks FDA to:
- refuse to issue a license to Ryoncil until the sponsor provides “substantial evidence” of effectiveness that consists of, at a minimum, at least one successful pivotal clinical trial that is prospective, randomized, blinded, and uses an appropriate concurrent control; and
- provide a copy of the petition to members of any advisory committee scheduled to discuss the BLA.
Lassman said it “believes that remestemcel-L’s ill-defined mechanism of action in combination with a pair of prior, failed, Phase 3 trials and a third trial featuring a confounded and uncontrolled historical control arm does not constitute ‘substantial evidence’ of Ryoncil’s effectiveness. It is particularly important for FDA to be confident in remestemcel-L’s efficacy given alternative, approved therapies on the market and potential development-stage therapies that could be delayed or passed over altogether, possibly causing harm to patients who have potentially life-threatening aGVHD.”