Switch Therapeutics Inc. has announced its first development candidate, a liver-sparing APOE (apolipoprotein E) RNAi therapy for treatment of Alzheimer’s disease in APOE4 carriers. Switch’s conditionally activated siRNA (CASi)-APOE program is designed to knock down APOE in the CNS without affecting APOE in the liver, where it plays a vital role in systemic lipid homeostasis.