Phase 1 trial using an autologous CAR-T cell therapy that targets the oncofetal antigen Claudin-6 (CLDN6) — and CARVac (BioNTech), a CLDN6-encoding mRNA-based vaccine designed to enhance CAR T-cell activity. Data show encouraging clinical activity for an investigational CAR T-cell therapy alone or in combination with an amplifying mRNA vaccine for patients with solid tumors.