Precision BioSciences Announces Two Oral Presentations Highlighting Updated Interim Data from Lead PBCAR0191 CAR T Immunotherapy for Relapsed and Refractory B-cell Malignancies at the 63rd Annual Meeting of the American Society of Hematology
- Enhanced Lymphodepletion Improved Overall Response Rate and Complete Response Rate Compared to Standard Lymphodepletion in Heavily Pretreated NHL and B-ALL Subjects with a Median of ~6
- Clinically Significant Activity in Subjects Previously Treated with Autologous CD19 Directed CAR T
- In B-ALL Subjects Enhanced Lymphodepletion or Higher Doses of PBCAR0191 Resulted in High Complete Response Rates Allowing the Potential to Bridge to Allogeneic Stem Cell Transplant
- Data Presented at ASH will be Updated to Include Subjects with >28 Day Follow up as of
“We are encouraged by the response rates seen in this heavily pre-treated patient population, and that a treatment strategy with enhanced lymphodepletion mitigated PBCAR0191 rejection and improved peak CAR T cell expansion and persistence, compared to standard lymphodepletion, with predictable toxicity,” said
The abstracts accepted by the ASH are now available at www.hematology.org, and will be presented during the following oral presentation sessions:
Oral Presentation Title: Allogeneic CAR-T PBCAR0191 with Intensified Lymphodepletion is Highly Active in Subjects with Relapsed/Refractory B-cell Malignancies
Oral Presentation Title: Preliminary Safety and Efficacy of PBCAR0191, an Allogeneic ‘Off-the-Shelf’ CD19-Directed CAR-T for Patients with Relapsed/Refractory (R/R) CD19+ B-ALL
Published abstracts report on key interim clinical evaluations of CD19+ NHL or B-ALL subjects treated with PBCAR0191.
Abstract #302: For 21 subjects with Relapsed/Refractory (R/R) B-cell malignancies (16 NHL, 5 B-ALL) who received PBCAR0191 following enhanced lymphodepletion1 as of
- PBCAR0191 demonstrated a safety profile with no Grade 3 CRS, one Grade 3 self-limited ICANS, no evidence of GvHD, and one infectious death at Day 54, deemed possibly related to treatment.
- 83% (15/18) of evaluable subjects experienced a complete response (CR) rate or complete remission with incomplete marrow recovery (CRi); 62% (8/13) of NHL subjects and 80% (4/5) of B-ALL subjects, respectively.
- 20% (3/15) of responders demonstrated durability of response greater than 6 months, with 3 additional responders not yet having reached a 6-month evaluation threshold.
- Compared to standard lymphodepletion2, enhanced lymphodepletion mitigated PBCAR0191 rejection to markedly improve peak CAR T cell expansion and persistence with area under the curve increasing 80-fold.
- Among 6 subjects who progressed following prior CD19 CAR therapy (5 NHL, 1 B-ALL), the overall response rate was 83% (5/6) with 67% (4/6) achieving a CR, including an ongoing MRD negative CR in a B-ALL subject of >6 months.
Abstract #650: For 15 subjects with R/R B-cell acute lymphoblastic leukemia including 11 subjects who received PBCAR0191 Dose Level 3/4a3 and 4 subjects who received PBCAR0191 Dose Level 4b4 as of
- PBCAR0191 demonstrated a safety profile with no cases of GvHD, no Grade ≥3 CRS, and one case of Grade 3 ICANS, which resolved within 48 hours.
- For subjects who received either Dose Level 3/4a following enhanced lymphodepletion or Dose Level 4b following standard lymphodepletion, 78% (7/9) achieved a high CR or CRi rate; 56% (5/9) maintained the CR at day 28 or later potentially securing an adequate window to bridge to allogeneic stem cell transplant.
- Use of enhanced lymphodepletion or higher doses of PBCAR0191 resulted in substantial improvements in peak CAR T cell expansion and area under the curve.
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1 eLD = Fludarabine (30 mg/m/day for 4 days) and cyclophosphamide (1000 mg/m2/day for 3 days)
2 sLD = Fludarabine (30 mg/m/day for 3 days) and cyclophosphamide (500 mg/m2/day for 3 days)
3 3 x 10 cells/kg or equivalent following either standard or enhanced lymphodepletion
4 Flat dose of 5 x 10 cells following standard lymphodepletion
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