Longterm Follow-up of Subjects Treated With bb2121

Study Overview
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Brief Summary
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This is a multi-center, non-randomized, open label, longterm safety and efficacy follow-up study for subjects who have been treated with bb2121 in the Phase 1 clinical parent study, that evaluated the safety and efficacy of bb2121 in subjects with relapsed or refractory B cell maturation antigen (BCMA)-expressing multiple myeloma. bb2121 is defined as autologous T lymphocytes (T cells) transduced ex vivo with anti-BCMA02 CAR lentiviral vector encoding the chimeric antigen receptor (CAR) targeted to human BCMA suspended in cryopreservative solution. bb2121 is administered in subjects 1 time (or retreated if retreatment criteria are met) in parent clinical study. No investigational treatment will be administered in this study. After completing the parent study, eligible subjects will be followed for up to 15 years after their last bb2121 infusion in the parent study.

Detailed Description
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The LTF-305 study has completed enrollment and is scheduled to be closed. All patients participating in this study have discontinued from follow-up or have been transferred into the GC-LTFU-001 study for further observation (similar to time frames established in the LTF-305).

Official Title
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Longterm Follow-up of Subjects Treated With bb2121

Conditions
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Multiple Myeloma

Intervention / Treatment
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* Drug: Safety and efficacy assessments


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Provision of written informed consent for this study by subjects Were administered bb2121 in the parent clinical study Able to comply with the study requirements Exclusion Criteria: Subject has disease progression AND subject has undetectable VCN (<0.0003 vector copies per diploid genome) in peripheral blood cells for 2 consecutive measurements at least 1 month apart, at least 12 months after drug product infusion

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Subjects with multiple myeloma<br>Subjects treated with ex vivo gene therapy in a bluebird bio sponsored trial who agree to participate in this study. | Drug: Safety and efficacy assessments<br>* Vector copy number (VCN) measurement, safety evaluations, disease-specific assessments, and assessments to monitor for long-term implications of autologous transplant<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Overall survival |  | 15 years post-drug product infusion | 
| Monitoring for all Adverse Events, including Serious Adverse Events, related to the drug product |  | 15 years post-drug product infusion | 
| Monitoring for all Serious Adverse Events including any new malignancy or new diagnosis of a neurologic, rheumatologic, or hematologic disorder that is clinically significant |  | 5 years post-drug product infusion | 
| Monitoring for Multiple Myeloma-specific response according to the International Myeloma Working Group (IMWG) Uniform Response Criteria for Multiple Myeloma | Subjects without disease progression will be evaluated for at least 5 years post-drug product infusion if VCN is undetectable, and up to 15 years post-drug product infusion if VCN remains detectable. | 5-15 years post-drug product infusion | 
| Progression Free Survival | Subjects without disease progression will be evaluated for at least 5 years post-drug product infusion if VCN is undetectable, and up to 15 years post-drug product infusion if VCN remains detectable. | 5-15 years post-drug product infusion | 
| Monitoring for Vector Copy Number (VCN) | Subjects without disease progression will be evaluated for at least 5 years post-drug product infusion if VCN is undetectable, and up to 15 years post-drug product infusion if VCN remains detectable. | 5-15 years post-drug product infusion |