Study of Eque-cel CAR-T Therapy in Newly Diagnosed Severe AL Amyloidosis

The goal of this clinical trial is to learn if Equecabtagene Autoleucel(Eque-cel), a Chimeric Antigen Receptor T-cell (CAR-T) therapy, works to treat severe Light Chain (AL) Amyloidosis in newly diagnosed adults with Mayo Stage IIIb. It will also learn about the safety and effects of Eque-cel. The main questions it aims to answer are: Does Eque-cel lead to hematologic remission (achieving a very good partial response or better) in AL amyloidosis? How safe is Eque-cel for these patients, and what side effects might occur? Participants will: Undergo blood cell collection to create personalized Eque-cel therapy. Receive pre-treatment to prepare their body for the therapy (lymphodepletion). Receive a single infusion of Eque-cel. Be monitored closely for 24 weeks after infusion, followed by long-term checkups for up to 15 years.