AC Immune reports interim results from Phase 2 trial of ACI-7104.056
Positive Clinical Trial Results: AC Immune reported encouraging interim safety and immunogenicity data from the Phase 2 VacSYn trial for ACI-7104.056, an anti-alpha-synuclein immunotherapy for early Parkinson's disease, showing significant antibody responses after treatment.
Future Developments: The company plans to provide further updates in H1 2025 regarding the expansion into Part 2 of the VacSYn study, highlighting the potential of their therapy as a leading option for treating Parkinson's disease.
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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.




