A joint initiative of the Dutch CAA Foundation and the HCHWA-D Association

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cAPPricorn-1

Finally! After years of preparation, the first drug trial in (Dutchtype) CAA will finally take place. The study is called cAPPricorn-1 and focuses on the RNA therapy Mivelsiran that Alnylam is developing. The first drug study into a therapy that may slow down (D)CAA, and therefore a milestone in the research into the disease. Thanks to everyone who has participated so far and made this possible!

This therapy might slow down the production of Amyloid Precursor Protein, which is responsible for the development of the toxic amyloid beta that causes (D)CAA. The study we can participate in, cAPPricorn-1, is a “phase 2” study.

In this news item you will find a link to a newsletter that explains everything about the drug and what a phase II entails. You’ll also find practical information about the study, such as choices made in the study design, who can participate and why, and what participation practically looks like.

cAPPricorn-1 will run for 2 years, with a voluntary extension of 18 months. You can participate from the age of 30 and only when you have been tested for the gene and are a carrier. There is no maximum age, but there is a limit to how far the disease may have progressed in order to participate. There are a number of other criteria for participation, such as BMI and pregnancy. That is why a screening is done before you can participate, which must show whether or not you are suitable to participate. This screening is done by the research team in Perth.

If you are eligible to participate, you will be asked to come to the hospital every three months. Most visits 2 to 3 days. During some visits you will be given the drug via a lumbar puncture, other visits are to investigate whether the drug runs through your system safely and whether early effects can be detected.

Half of the participants will receive Mivelsiran, the other half will receive a placebo. After 24 months, participants can choose to participate in the "open label extension", in which all participants will receive Mivelsiran.

Want to learn more? The Alzheimer’s Research Australia team, together with the DCAA patient association, is organizing a DCAA family meeting July 5th 2025 (1.30pm – 5.30pm). During the meeting we will tell you more about cAPPricorn-1, what participation looks like and why this trial is such a milestone. We’d also like to hear your questions, thoughts, and input. Find more information and register here.

 

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Requirements for participation

You are eligible to participate in TRACK DCAA if:
 

  • You are between the age of 25 and 60 years old;
  • You are a genecarrier OR;
  • You do not know if you carry the gene, but one of your parents or grandparents is or was a DCAA genecarrier.

Sign up for research

We make sure that you will never find out your genetic status if you do not want to know! The research team will test your blood for the gene, but these results are blinded, so the research team does not know the genetic status of individuals. We want to be a 100% sure there is no way for you to find out by accident.

If need more information or have questions you want to talk through, our confidant Sanne van Rijn can speak to you first. She will take the time to answer your questions and talk you through what participation entails.

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Do you want to stay informed of the most important developments? Then sign up for the newsletter of Vereniging HCHWA-D.

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