SEC Filings

AVEXIS, INC. filed this Form 424B5 on 06/19/2017
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          This summary highlights information contained in other parts of this prospectus supplement or incorporated by reference from our Annual Report on Form 10-K for the year ended December 31, 2016, our Quarterly Report on Form 10-Q for the quarter ended March 31, 2017 and our other filings with the Securities and Exchange Commission listed in the section of this prospectus supplement entitled "Incorporation of Certain Information by Reference." This summary does not contain all of the information you should consider in making your investment decision. Before deciding to invest in our common stock, you should read this prospectus supplement, the accompanying prospectus, any related free writing prospectus and the information incorporated by reference herein and therein in their entirety. You should carefully consider, among other things, the matters discussed in the section entitled "Risk Factors" contained in this prospectus supplement and any related free writing prospectus, and under similar headings in the other documents that are incorporated by reference in this prospectus supplement and the accompanying prospectus. Some of the statements in this prospectus supplement constitute forward-looking statements that involve risks and uncertainties. See "Special Note Regarding Forward-Looking Statements."

AveXis, Inc.

Company Overview

          We are a clinical-stage gene therapy company dedicated to developing and commercializing novel treatments for patients suffering from rare and life-threatening neurological genetic diseases. Our initial product candidate, AVXS-101, is our proprietary gene therapy product candidate. We recently completed our Phase 1 clinical trial for AVXS-101 for the treatment of spinal muscular atrophy Type 1, or SMA Type 1, the leading genetic cause of infant mortality. SMA Type 1 is a lethal genetic disorder characterized by motor neuron loss and associated muscle deterioration, resulting in mortality or the need for permanent ventilation support before the age of two for greater than 90% of patients. The survival motor neuron protein, or SMN, is a critical protein for normal motor neuron signaling and function. Patients with SMA Type 1 either have experienced a deletion of their SMN1 genes, which prevents them from producing adequate levels of functional SMN protein, or carry a mutation in their SMN1 gene. AVXS-101 is designed to deliver a fully functional human SMN gene into the nuclei of motor neurons that then generates an increase in SMN protein levels and we believe this will result in improved motor neuron function and patient outcomes.

          In our fully enrolled Phase 1 clinical trial, we treated 15 SMA Type 1 patients, divided into two dosing cohorts, and observed a favorable safety profile and that AVXS-101 is generally well-tolerated. As of January 20, 2017, the trial evaluation date for which we reported top-line results, all patients in the study have survived, in contrast to the independent, peer-reviewed natural history study for patients with SMA Type 1. Additionally, we have observed improved motor function, including the attainment of motor milestones such as the ability to sit unassisted, crawl, stand and walk — motor milestone achievements that are essentially never seen among untreated patients suffering from SMA Type 1. The open-label, dose-escalating study was designed to evaluate the safety and tolerability of AVXS-101 in patients with SMA Type 1. The key measures of efficacy were the time from birth to an "event," which was defined as either death or at least 16 hours per day of required ventilation support for breathing for 14 consecutive days in the absence of acute reversible illness or perioperatively, and video confirmed achievement of ability to sit unassisted. Additionally, several exploratory objective measures were assessed, including a standard motor milestone development survey and Children's Hospital of Philadelphia Infant Test of Neuromuscular Disorders, or CHOP INTEND.

    Event-free Survival and Safety:  Data as of January 20, 2017, showed no new events, and 15 of 15 patients (100%) were event-free at 13.6 months. The expected event-free survival


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