Clene针对ALS的候选药物CNM-Au8获FDA书面指导以加速批准

SALT LAKE CITY, Dec. 10, 2024 (GLOBE NEWSWIRE) -- Clene Inc. (Nasdaq: CLNN) (along with its subsidiaries, “Clene”) and its wholly owned subsidiary Clene Nanomedicine Inc., a late clinical-stage biopharmaceutical company focused on revolutionizing the treatment of neurodegenerative diseases, including amyotrophic lateral sclerosis (ALS) and multiple sclerosis (MS), today announced that it recently received written guidance from the Division of Neurology 1 (DN1), of the U.S. Food and Drug Administration (FDA) regarding a potential accelerated approval pathway for CNM-Au8® in ALS.

As announced previously on September 16, 2024, Clene was initially advised that the data presented in its briefing package for CNM-Au8 was not adequate to support an NDA submission under the accelerated approval pathway. However, following Clene’s November 1, 2024 meeting with DN1 and presentation of additional data and analyses, the FDA has provided guidance on a potential path to meet the regulatory standard for substantial evidence of effectiveness supporting accelerated approval. The FDA recommended that Clene investigate whether additional data from the ongoing compassionate use EAPs could be leveraged to substantiate the effect of CNM-Au8 on NfL decline.

Clene intends to follow the FDA’s recommendation to provide data from the ongoing EAPs and believes that it can address the FDA’s requests. This additional NfL biomarker collection and analyses to support NDA submission is planned to be completed during second quarter of 2025, as summarized below:

• NfL Biomarker Analyses: Provide supportive evidence of NfL declines in participants from the three ongoing FDA-authorized compassionate use EAPs. Clene will meet with the FDA in early 2025 to review and finalize its statistical analysis plan for the EAP NfL biomarker analyses.

• Survival Pharmacometric Modeling: Provide analyses of NfL and related disease-specific biomarkers linked to clinical survival benefit and clinical changes from the Phase 2 trial data.

• Additional ALS-specific biomarkers: Provide analyses of additional ALS-disease specific biomarkers to support the pharmacodynamic activity of CNM-Au8 for treatment of ALS.

The FDA noted that whether NfL can serve as a reasonably likely surrogate endpoint for the effects of CNM-Au8 in ALS and whether the magnitude of change observed on NfL in patients treated with CNM-Au8 is reasonably likely to predict clinical benefit for ALS would be a matter of review.

Clene plans to commence the confirmatory Phase 3 RESTORE-ALS trial with participant enrollment beginning prior to the submission of the NDA. The study is designed to investigate the effects of CNM-Au8 on improved survival (primary endpoint) and delayed time to ALS clinical worsening events (secondary efficacy endpoint).

“We are incredibly grateful for the FDA’s willingness to consider how the available data from our expanded access programs may be able to support the existing clinical study data to allow for the review of an application for approval of CNM-Au8 for ALS via an accelerated regulatory pathway, and for the valuable feedback we have received to date,” said Rob Etherington, President and CEO of Clene. “Together with the survival and supportive biomarker data generated thus far, the drug’s benign safety profile, and the emerging EAP NfL data, we look forward to continued discussions with the Agency. Clene plans to include the additional data in an NDA submission under the accelerated approval pathway in mid-2025. We remain dedicated to the ALS community and honored to help critically ill patients and their families.”

Jinsy A. Andrews, MD, MSc, FAAN, Associate Professor of Neurology and the Director of Neuromuscular Clinical Trials at Columbia University, and Primary Investigator of the CNM-Au8 Clene NIH EAP Compassionate Use Protocol, said, “Having seen first-hand the potential benefits of CNM-Au8 in both its clinical and compassionate use EAP programs, I am grateful that the FDA has recognized the power of real-world experience for a drug in ALS, and is willing to consider how EAP data can help ALS drugs advance on regulatory pathways.”

Merit Cudkowicz, MD, Chair, Neurology Department, Massachusetts General Hospital, Director, Sean M Healey & AMG Center for ALS, and the Principal Investigator of the HEALEY ALS Platform Trial, said, “It was my pleasure to assist Clene in these varied supportive analyses, including NfL biomarker data from participants in our trials. Given the limited therapeutic options for ALS and a high sense of urgency, I am grateful to participate in considering multiple paths forward in ALS.”

Presentation at the November 1, 2024 FDA In-person Meeting: As previous noted, at the FDA in-person meeting on November 1, 2024, Clene and recognized ALS experts presented new supportive prespecified and post hoc analyses of its Phase 2 data, which included:

• 78% Risk Reduction in Time to Death (Improved Survival) during the Open Label Extension to Month 12 from the HEALEY ALS Platform Trial (CNM-Au8 30 mg vs. original placebo randomization; covariate adjusted Cox Hazard Ratio (HR) = 0.224, 95% CI: 0.053 – 0.949, p-value = 0.042)

• Evidence Linking Baseline NfL Burden with a CNM-Au8 Survival Benefit (post hoc) included:

83% Risk Reduction of Time to Death or PAV (Permanently Assisted Ventilation) observed in CNM-Au8 participants with the highest baseline Upper NfL Tertile from the HEALEY ALS Platform Trial through Month 12 (CNM-Au8 30 mg vs. original placebo randomization; covariate adjusted Cox HR = 0.174, 95% CI: 0.036 – 0.830, p-value = 0.0283)

84% Risk Reduction of Time to Death or PAV seen in CNM-Au8 Participants with baseline NfL > Median from the HEALEY ALS Platform Trial through Month 12 (CNM-Au8 30 mg vs. original placebo randomization; covariate adjusted Cox HR = 0.155, 95% CI: 0.035 – 0.693, p-value = 0.0147)

• Evidence Linking NfL Decline with a CNM-Au8 Survival Benefit (post hoc) included:

57% of CNM-Au8 30 mg treated participants demonstrated NfL decline at week 24 (the end of the HEALEY-ALS Platform double-blind trial)

91% Risk Reduction in Time to Death or PAV observed in participants with any level of NfL decline (or missing NfL data) at week 24 in the HEALEY ALS Platform Trial with follow-up through Month 12; (CNM-Au8 30 mg vs. original placebo randomization; covariate adjusted Cox HR = 0.0925, 95% CI: 0.22 – 0.382, p-value = 0.001)

• Long-Term Survival from Real-World Expanded Access Compassionate-use Protocols showing a 31% risk reduction in CNM-Au8 participants who were unable to enter other ALS clinical trials due to advanced disease severity, when compared to propensity matched controls pooled from three different natural history and clinical trial datasets (covariate adjusted Cox HR = 0.689, 95% CI: 0.529 – 0.898, p-value = 0.0059)

In over 700 patient years of use of CNM-Au8, no significant safety concerns or safety trends have been identified. No serious adverse events (SAEs) have been identified as related to CNM-Au8 treatment by any investigator to date.