BB2121 CAR T Results Described in New England Journal of Medicine
Posted: May 08, 2019
BB2121 CAR T Results Described in New England Journal of Medicine image

Last week the New England Journal of Medicine published results from the Phase I Celgene bb2121 CAR T clinical trial. 

In the Phase I study, 33 patients with relapsed or refractory myeloma were giving bb2121 as a single infusion of the CAR T product at different doses in the dose escalation phase (50×106, 150×106, 450×106, or 800×106 ). Two of of those doses (150×106 to 450×106) were used in the expansion phase. Patients who participated had received at least three prior lines of treatment and their myeloma had become resistant to both a proteasome inhibitor and an immunomodulator. As in all phase I studies, the goal is to assess safety. 

The following data was gathered up until 6.2 months after the last patient's infusion date:

  • Most common grade 3 or higher side effects included: neutropenia (85%), leukopenia (58%), anemia (45%) and thrombocytopenia (45%). 
  • Grade 1 or 2 cytokine release syndrome was found in 70% of patients. Grade 3 CRS was found in 6% of patients. 
  • Grade 1 or 2 neurologic toxicity was found in 39% of patients. One patient had a reversible grade 4 neurologic toxic effect.  
  • The objective response rate was 85%. Fifteen patients (45%) had complete responses and six of these 15 have relapsed. 
  • Sixteen patients who had a partial response or better were tested for minimal residual disease (MRD) and had MRD negative status. 
  • The median progression-free survival was 11.8 months.  
  • The CAR T cells persisted up to 1 year after the infusion.

This graph shows each patient, the dose they received and how they have responded over a period of up to 23 months. The patients in this study were heavily pretreated. While median numbers are important, we believe that future work with CAR T cells in multiple myeloma will better identify patients who will respond well and maintain responses to this type of treatment. These are the first and most comprehensive data on CAR T in multiple myeloma to date. 

According to principal investigator Noopur Raje, MD of Massachusetts General Hospital:

“The adverse events noted in our study were very manageable, and we saw low rates of cytokine release syndrome and neurotoxicity... manageable to the extent that we are now thinking [forward to] outpatient settings. Response rates were high, but we did not see a plateauing of responses in very late-stage multiple myeloma.”


The author Jennifer Ahlstrom

about the author
Jennifer Ahlstrom

Myeloma survivor, patient advocate, wife, mom of 6. Believer that patients can help accelerate a cure by weighing in and participating in clinical research. Founder of Myeloma Crowd by HealthTree and the HealthTree Foundation.

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