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benzinga Corporate Catalyst Impact 75/100 ● positive

AC Immune Announces Safety And Immunogenicity Results Through Week 100 In Part 1 Of VacSYn, Its Phase 2 Trial Of ACI-7104 In Patients With Early-Stage Parkinson’s Disease: All Primary Endpoints Were Met, Generally Safe And Well Tolerated; Strong Immunogenicity Demonstrated, With 100% Response Rate After Three Immunizations

Sep 23, 2026, 11:05 AM UTC · Primary ticker $ACIU

AC Immune announced positive safety and immunogenicity results for Part 1 of its Phase 2 trial of ACI-7104 for early-stage Parkinson's disease, meeting all primary endpoints. This positive data supports the drug's continued development and progression to Part 2, providing a significant de-risking event for the company's lead Parkinson's candidate.

AC Immune (ACIU) reported that Part 1 of its Phase 2 VacSYn trial for ACI-7104 in early-stage Parkinson's disease met all primary endpoints for safety, tolerability, and immunogenicity. This is a crucial de-risking event for the company's lead candidate, as it validates the drug's safety profile and its ability to generate a strong immune response. While Part 1 was not designed for clinical outcomes, exploratory analyses showed preliminary evidence of target engagement and trends suggesting an association between immunogenicity and disease activity, which is encouraging for future development. This news is a short-term positive catalyst for ACIU, as it paves the way for the initiation of Part 2 of the trial, which will focus on clinical activity. The long-term implication is the potential for ACI-7104 to become a significant treatment for Parkinson's disease, but significant development and regulatory hurdles remain. The key opportunity for traders is the potential for ACIU's stock to appreciate on this positive news and future progress.

$ACIU positive Positive Phase 2 trial results
Source: benzinga
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