Venetoclax-Dexamethasone in Relapsed and/or Refractory t(11;14) Amyloidosis

Inclusion Criteria: * Age ≥ 18 years at time of signing Informed Consent Form * Ability to comply with the study protocol, in the investigator's judgment * Confirmed diagnosis of systemic AL amyloidosis by mass spectrometry or immunohistochemistry (IHC) on a tissue biopsy * Has received ≥1 prior lines of therapy, including an anti-cluster of differentiation 38 (CD 38) monoclonal antibody * Participants with a history of autologous hematopoietic cell transplantation must have recovered from any transplant-related toxicities * Presence of t(11;14) on FISH at any time since diagnosis (Eligibility must confirmed by FISH testing at Columbia University Irving Medical Center (CUIMC) * Eastern Cooperative Oncology Group (ECOG) performance status of 0, 1, or 2 Exclusion Criteria: * Known hypersensitivity to any of the study drugs * History of other malignancy that could affect compliance with the protocol or interpretation of results (Patients with a history of curatively treated basal or squamous cell carcinoma of the skin, in situ carcinoma of the cervix, breast cancer, or Hodgkin's Lymphoma are generally eligible. Patients with a malignancy that has been treated, but not with curative intent, will be excluded, unless the malignancy has been in remission without treatment for ≥ 2 years prior to enrollment.) * Evidence of other clinically significant uncontrolled condition(s) including, but not limited to, uncontrolled systemic infection (viral, bacterial, or fungal) * Patients on…