Policy & Regulation
Levo Therapeutics Releases Disappointing Top-line Results from Phase 3 CARE-PWS Study of LV-101 (Intranasal Carbetocin) for the Treatment of Prader-Willi Syndrome
7 August 2020 - - US-based biotechnology company Levo Therapeutics, Inc has released top-line results from the Phase 3 CARE-PWS clinical study evaluating LV-101 (intranasal carbetocin) for the treatment of PWS.

This syndrome is a complex, neurodevelopmental disorder that occurs in approximately 1 in 16,000 birthsi and is characterized by a false state of starvation and associated hyperphagia (unrelenting hunger), to which a deficiency in oxytocin is believed to be contributoryii.

LV-101 is a selective oxytocin-receptor agonist. CARE-PWS tested two doses of LV-101 versus placebo with an even randomization (1: 1: 1), specifying the 9.6 mg dose as the primary endpoint and the 3.2 mg dose as the first secondary endpoint.

After consultation with the US Food and Drug Administration, enrollment was closed early due to COVID-19 with 119 evaluable patients in the Primary Analysis Set.

While the study did not meet its primary outcome measurements evaluating the 9.6 mg dose of LV-101 (intranasal carbetocin), statistical significance was achieved with the 3.2 mg dose as evaluated by the Hyperphagia Questionnaire for Clinical Trials (HQ-CT) score (p=0.016) as the first secondary endpoint.

When pooling the two dose arms of LV-101, per a pre-specified analysis, the change in HQ-CT score from baseline to week eight resulted in a p-value of 0.055.

Consistency in benefit/response was observed in the 3.2 mg dose arm across other key secondary endpoints, including clinical global impression of change (CGI-C; p=0.027) and anxiety and distress behaviors, as evaluated by the PWS Anxiety and Distress Behaviors Questionnaire (PADQ; p=0.027).

Neither dose demonstrated a statistically significant effect on the Children's Yale-Brown Obsessive Compulsive Scale (CY-BOCS). LV-101 was generally well-tolerated in the study.

Upon completion of the placebo-controlled period (i.e., after week eight), all patients were transitioned into the long-term follow-up period and received intranasal carbetocin.

Greater than 98% of patients enrolled in CARE-PWS elected to enter the long-term follow-up period. Of note, further improvements in scores were observed and subsequently maintained after week eight in both dose arms.

Safety data show that LV-101 (intranasal carbetocin) was generally well-tolerated. Treatment emergent adverse events (TEAEs) occurring in 5% or more of participants during the placebo-controlled period (TEAEs ≥ 5%) at the 3.2 mg dose include headache (16.3% vs. 7.0% for placebo), flushing (14.0% vs. 0.0% for placebo), diarrhea (9.3% vs. 2.3% for placebo), nasal discomfort (7.0% vs. 2.3% for placebo), pyrexia (7.0% vs. 0.0% for placebo), and upper respiratory tract infection (7.0% vs. 4.7% for placebo), all of which were considered mild or moderate.

TEAEs ≥ 5% at the 9.6 mg dose include flushing (20.5% vs. 0.0% for placebo), epistaxis (13.6% vs. 2.3% for placebo), and headache (9.1% vs. 7.0% for placebo), all of which were also mild to moderate in severity.

With these results in hand, all patients actively participating in CARE-PWS will be transitioned to receive the 3.2 mg dose of LV-101 for the remainder of their long-term follow-up and extension periods.

CARE-PWS (CARbetocin Efficacy and Safety Study in PWS; study NCT03649477) is a multi-center, randomized, double-blind, eight-week placebo-controlled study designed to test the effectiveness, safety, and tolerability of LV-101 (intranasal carbetocin) in participants age 7-18 with PWS.

Effectiveness is measured using both caregiver-reported and clinician-reported measures of hyperphagia (extreme hunger), obsessive and compulsive behaviors, and anxiety. Safety and tolerability are measured by adverse events, laboratory tests, and physical exams.

All participants received active treatment with LV-101 after the eight-week placebo-controlled period, during a long-term follow-up period of 56 weeks.

At week eight, participants who were randomized to placebo in the placebo-controlled period were transitioned to one of the two LV-101 doses, while the participants in the active treatment arms remained on their originally assigned dose.

The two primary efficacy measures of the study are the changes from baseline to week eight in either HQ-CT scores or CY-BOCS scores (9.6 mg versus placebo).

Secondary efficacy measures include changes in HQ-CT or CY-BOCS scores from baseline to week eight for patients receiving the 3.2 mg dose versus placebo, changes in PADQ scores from baseline to week eight, and CGI-C scores through week eight.

CARE-PWS includes an optional extension period, where subjects participating in the long-term follow-up period have an opportunity to continue receiving intranasal carbetocin.

Of the patients who have completed CARE-PWS's 56-week long-term follow up period, 100% have elected to participate in the extension program.

Carbetocin is an analog of the naturally-occurring neuroendocrine hormone oxytocin. Carbetocin was designed to have an improved receptor binding profile compared to oxytocin, with greater affinity for the oxytocin receptor and lower affinity for related vasopressin receptors.

Through our licensor, Ferring Pharmaceuticals, carbetocin is approved in over 90 countries outside the United States for the prevention of uterine atony and excessive bleeding during cesarean section delivery, as well as newly approved in the EU following vaginal birth, with an estimated cumulative exposure of over 10 m patients.

LV-101 is an investigational intranasal form of carbetocin, intended to be administered to patients with PWS three times each day before meals.

For additional background information, the results of the Phase 2 study of intranasal carbetocin (LV-101) in patients with genetically confirmed PWS can be found online at JCI Insight.

LV-101 has been granted orphan drug and Fast Track designations from the US Food and Drug Administration.

Prader-Willi syndrome is a complex, multisystem neurodevelopmental disorder that occurs in approximately 1 in 16,000 births.

The underlying cause of PWS is the lack of expression of paternally-inherited imprinted genes on chromosome 15q11-q13.

These genetic anomalies lead to a distinctive phenotype that includes mild to moderate levels of intellectual disability, compulsivity, growth hormone deficiency, life-threatening hyperphagia, and anxiety.

Levo Therapeutics is a biotechnology company dedicated to using genetic insights to advance treatments for Prader-Willi syndrome and related disorders.
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