Plasma Cell Dyscrasias

The investigators are researching patients with diseases of their plasma cells in order to improve their quality and length of life. The investigators have created a database of patient information, blood samples, and bone marrow tissue in order to achieve the following three goals: * Surveillance: The investigators want to track what treatments patients get or don't get, how effective they are, how they feel, what complications they suffer, how long they stay in remission, and how long they live. * Contact: Because myeloma and amyloidosis are rare, less than 700 patients are diagnosed in the state of Ohio each year, patients often feel they don't have accurate information. The investigators want to provide them access to our clinical team (both phone and email consultations, even office visits for patients that can come to Columbus) as well as information regarding informational events pertaining to your disease and local support groups. * Research: Because nearly all myeloma and amyloid patients relapse and treatment is eventually unsuccessful, our focus is to develop more effective treatments that not only prolong life, but cure the disease. Periodically the investigators will inform them about clinical trials studying new drugs or treatment paradigms.

This study is an open-label, single-arm, dose-escalation and expansion, prospective clinical trial. It enrolls patients with relapsed/refractory plasma cell disorders, administers GPRC5D CAR-T cell therapy, follows up to observe adverse reactions after medication, collects relevant data on treatment efficacy, evaluates the safety and efficacy of CAR-T cells, and simultaneously investigates the cellular kinetic characteristics of CAR-T cells.

This is a prospective, non-interventional, observational study. The purpose of this study is to collect data and bio-specimens that will support future research