AC Immune Doses First Participant in ACI-19764 Clinical Trial
AC Immune announced that the first participant has been dosed in a Phase 1 clinical trial of ACI-19764, an orally administered small molecule inhibitor of the NLRP3 inflammasome. Targeting the NLRP3 inflammasome provides an opportunity to reduce the chronic inflammation thought to be associated with disease progression in multiple inflammatory disorders, metabolic diseases, and neurological diseases, including Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis and frontotemporal dementia.
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- Trial Suspension: AC Immune's mid-stage trial ReTain for the Alzheimer's candidate ACI-35.030/JNJ-2056 has temporarily paused enrollment as partner Johnson & Johnson evaluates various aspects of the trial, including recruitment, which may impact the drug's market entry timeline.
- Financial Stability: Despite the trial's pause, AC Immune has stated that J&J's decision will not affect its liquidity position, as existing capital resources are sufficient to fund operational needs into Q3 2027, ensuring stability in its R&D efforts.
- Collaboration Background: The drug's development stems from a licensing and commercialization agreement signed in 2015, allowing AC Immune to initially receive up to $509 million from J&J, highlighting the long-term collaborative potential in Alzheimer's treatment.
- Market Reaction: AC Immune's stock price may be affected by the trial suspension news; although the company has confirmed liquidity is secure, investor concerns regarding the drug's development progress could lead to short-term market volatility.

Interim Results from VacSYn Trial: AC Immune SA reported promising interim safety and efficacy results from its Phase 2 VacSYn trial for the anti-alpha-synuclein immunotherapy ACI-7104.056, indicating potential slowing of Parkinson's disease progression through stabilization of disease-related biomarkers.
Robust Antibody Response: The treatment induced a strong antibody response against the target antigen, with a 100% responder rate and significantly higher antibody levels in both serum and cerebrospinal fluid compared to the placebo group.
Clinical Measures of Stabilization: Clinical assessments showed that the ACI-7104.056 group did not experience meaningful progression in motor symptoms, contrasting with the expected increase in the placebo group, suggesting a trend toward disease stabilization.
Future Expectations: The trial results are generally safe and well-tolerated, with final data from Part 1 of the VacSYn trial anticipated in mid-2026, while AC Immune's stock saw a notable increase following the announcement.

- Clinical Trial Success: AC Immune's Phase 2 VacSYn trial of ACI-7104.056 demonstrates, for the first time, that targeting alpha-synuclein pathology with active immunotherapy may slow the progression of Parkinson's disease, marking a significant breakthrough in treatment.
- Strong Safety Profile: The therapy was administered to 34 patients, all treated for at least 12 months, with no clinically relevant adverse events reported, indicating a favorable safety and tolerability profile.
- Robust Immune Response: By week 76, the ACI-7104.056 group exhibited antibody titers over 500 times higher than the placebo group, achieving a 100% responder rate, showcasing the therapy's potential to induce a strong immune response and laying the groundwork for future treatments.
- Stabilization of Biomarkers: The treatment group showed stable levels of neurofilament light chain (NfL), a marker of neuronal damage, while levels increased in the placebo group, suggesting that the therapy may effectively slow neuronal damage, which has significant clinical implications.

- Clinical Trial Results: AC Immune's Phase 2 VacSYn trial demonstrates for the first time that the active immunotherapy ACI-7104.056 may slow the progression of Parkinson's disease by targeting alpha-synuclein pathology, marking a significant breakthrough in treatment options.
- Safety and Immunogenicity: The therapy achieved a 100% responder rate in a cohort of 34 patients with no clinically relevant safety issues reported, indicating a strong safety profile and tolerability that supports further development.
- Biomarker Stability: In the treatment group, levels of alpha-synuclein in cerebrospinal fluid remained stable, contrasting with a decline in the placebo group, suggesting that ACI-7104.056 may stabilize pathology through antibody binding, indicating potential disease-modifying effects.
- Future Development Plans: Following these promising interim results, AC Immune aims to engage with regulators to discuss a clinical development plan for ACI-7104.056, with the goal of accelerating the registration process, and final data from the trial are expected in mid-2026.
Positive Trial Results: AC Immune SA announced positive interim results from the Phase 2 VacSYn trial of ACI-7104.056, showing a 100% responder rate in antibody response against alpha-synuclein in early Parkinson's disease.
Potential Disease Modification: The trial indicated stabilization of disease-relevant biomarkers, suggesting a potential slowing of Parkinson's disease pathology and highlighting the treatment's efficacy and safety.
Regulatory Plans: Following these findings, AC Immune plans to seek regulatory feedback on the clinical development plan for ACI-7104.056.
Market Impact: AC Immune's stock closed at $2.54, reflecting an 8.63% decline on the Nasdaq following the announcement.

Positive Trial Results: AC Immune's stock rose ~30% after announcing positive initial results from a mid-stage trial for ACI-7104.056, an immunotherapy for early Parkinson’s disease, which met all target criteria for immunogenicity in a placebo-controlled study.
Safety and Efficacy: The therapy was reported to be generally safe and well-tolerated, with interim data suggesting it could slow the progression of Parkinson's disease by targeting alpha-synuclein pathology.
Regulatory Plans: AC Immune plans to meet with regulatory authorities to discuss accelerating the drug's development towards registration, with final data from the trial expected in mid-2026.
Trial Details: The Phase 2 VacSYn trial involved 34 patients who received at least 12 months of treatment, marking a significant step in the development of immunotherapy for Parkinson's disease.





