Study of bb21217 in Multiple Myeloma

Inclusion Criteria:

≥18 years of age at the time of signing informed consent
Eastern Cooperative Oncology Group (ECOG) performance status 0 or 1
Diagnosis of MM with relapsed or refractory disease and have had at least 3 different prior lines of therapy with previous exposure to PI, IMiDs, and a CD38 antibody. Have undergone at least 2 consecutive cycles of treatment for each therapy, unless PD was the best response to the therapy. Refractory to their last line of therapy.
Subjects must have measurable disease

Exclusion Criteria:

Subjects with known central nervous system disease
Inadequate hepatic function
Inadequate renal function
Inadequate bone marrow function
Presence of active infection within 72 hours
Subjects with a history of stroke, unstable angina, myocardial infarction, or ventricular arrhythmia requiring medication or mechanical control
Significant co-morbid condition or disease which in the judgment of the Investigator would place the subject at undue risk or interfere with the study; examples include, but are not limited to, cirrhotic liver disease, sepsis, recent significant traumatic injury, and other conditions
Known human immunodeficiency virus (HIV) positivity
Known hepatitis A virus (HAV), hepatitis B virus (HBV) or hepatitis C virus (HCV) positivity with evidence of ongoing infection.
Pregnant or lactating women
Previous history of an allogeneic bone marrow transplantation, treatment with any gene therapy based therapeutic for cancer, or BCMA-targeted therapy
Inadequate pulmonary function defined as oxygen saturation (SaO2) <92% on room air
Subjects who have a history of plasma cell leukemia, active plasma cell leukemia, Waldenstrom's macroglobulinemia, POEMS, or clinically significant amyloidosis