AveXis (AVXS) Gains After Annoucning Single-Arm Design of AVXS-101 Study
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AveXis, Inc. (NASDAQ: AVXS) is gaining 15.6% after-hours after the company announced that the planned pivotal study of AVXS-101 in spinal muscular atrophy (SMA) Type 1 will reflect a single-arm design, using natural history of the disease as a comparator, and enroll approximately 20 patients. This update is based on the receipt of the minutes following the Type B meeting with the U.S. Food and Drug Administration (FDA) held on September 30, 2016.
In addition to evaluating safety, the planned program is expected to evaluate achievement of motor milestones, specifically patients’ ability to sit unassisted, as well as an efficacy measure defined by the time from birth to an “event,” defined as death or requiring at least 16 hours per day of ventilation support for breathing for greater than two weeks in the absence of an acute reversible illness, or perioperatively.
At the Type B meeting and in the meeting minutes, the FDA acknowledged the company’s rationale for a single-arm pivotal study and provided a number of constructive suggestions to help optimize such a trial design. The FDA also indicated its preference for a design with co-primary endpoints consisting of a measure of developmental milestone achievement (such as sitting unassisted) along with a clinically meaningful measure of survival (such as time to an “event” as described above). Based on FDA’s suggestions as well as other expert input, AveXis continues to evaluate a number of the details of the trial design. More specific information will be made available at the time the study is initiated, which is expected in the first half of 2017.
“We believe the Type B meeting had a positive tone, with FDA offering a number of constructive suggestions which we believe will better enable implementation of a pivotal study design that is most appropriate for the patients suffering from this devastating disease,” said Sean Nolan, President and Chief Executive Officer of AveXis. “With the feedback needed from the FDA to move forward with our pivotal trial, we plan to proceed as expeditiously as possible to begin the study in the first half of 2017.”
With regard to the ongoing Phase 1 trial of AVXS-101, the FDA stated the following in the meeting minutes: “We strongly recommend that at the completion of the study, you request an end-of-Phase 1 meeting to evaluate the adequacy of data to support future product development, including a discussion of whether the data from the Phase 1 study might provide the substantial evidence necessary to support a marketing application.”
The company’s strategy with the SMA Type 1 program is to complete the ongoing Phase 1 trial and, in parallel, execute on the single-arm pivotal trial, while continuing collaborative discussions with the FDA regarding the most expeditious pathways for FDA approval of AVXS-101.
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