Innovent Biologics, Inc., a world-class biopharmaceutical company that develops, manufactures and commercializes high-quality medicines for the treatment of cancer, metabolic, autoimmune and other major diseases, together with IASO Biotherapeutics (IASO Bio), jointly announced to deliver an oral presentation on updated data from the Phase I study of IBI326 in patients with relapsed/refractory multiple myeloma (R/R MM) at the European Hematology Association (EHA) Congress, June 9-17, 2021. The presentation will further demonstrate the safety, efficacy, and increased persistence of IBI326.
IBI326 is a fully-human B-cell maturation antigen (BCMA)-directed chimeric antigen receptor (CAR) T-cell therapy co-developed by IASO Bio and Innovent, and it is currently under the pivotal Phase II clinical trial. In February 2021, IBI326 was granted the Breakthrough Therapy Designation (BTD) by China regulatory authority, National Medical Production Administration (NMPA) for the treatment of relapsed/refractory multiple myeloma.
In the oral presentation, Professor Chunrui Li with Tongji Hospital, Tongji Medical College, Huazhong University of Science & Technology (HUST) in China will report the clinical data on 35 patients with R/R MM, who received 1.0, 3.0, or 6.0 × 106/kg IBI326 treatment respectively in the dose-escalation phase and dose-expansion cohort. The 1.0 × 106/kg dose was determined as Recommended Phase II Dose (RP2D). The median age of the 35 patients was 54 (27, 72). Among them, eight patients had extramedullary multiple myeloma (EMM) and one patient had complication with plasma cell leukemia. The median number of prior treatment regimens was four (3, 12). Ten patients previously received autologous hematopoietic stem cell transplantation (AHSCT), and 10 patients received murine BCMA CAR-T treatment. As of May 1, 2021, the median follow-up of the 35 patients was 291 days (21, 954).
IBI326 has a rapid onset of action and long-lasting efficacy. The overall response rate (ORR) was 97.1% in the 35 patients, among whom 29 patients (82.9%) achieved ≥ VGPR and 20 patients (57.1%) achieved complete response/stringent complete response (CR/sCR). And 34 patients evaluable for MRD achieved minimal residual disease (MRD) negativity, with the median time to MRD negativity 1.3 (0.7, 4.1) months.
All patients previously treated with murine BCMA CAR-T or patients with extramedullary multiple myeloma (EMM) benefited from IBI326. Among all 35 patients, eight were with EMM, among whom eight (75%) achieved ≥VGPR, two (25%) achieved PR, eight patients achieved ≥PR. Among all 35 patients, 10 patients were treated with a prior murine BCMA CAR-T treatment, among whom eight (80%) achieved ≥VGPR, one (10%) achieved PR, one（10%）achieved stable disease (SD).
IBI326 has a good safety profile. Five of the 35 patients had cytokine release syndromes (CRS) of Grade 3 or above. The median time to onset of CRS was 4 (1, 9) days, and all CRS could be efficiently controlled by tocilizumab and/or steroids. ICANS was observed in only one patient whose symptom was drowsiness; the patient later spontaneously relieved without any treatment.
IBI326 was persistent in the patients. The median time to reach the peak of IBI326 expansion in the patients was 12 (7, 17) days. As of the cut-off date, three patients had IBI326 persistence for over two years, and the first patient of them achieved persistent sCR.
IBI326 has lower immunogenicity. Only two patients (5.7%) were detected positive for anti-drug antibody (ADA), and the immunogenicity was significantly lower than that of the prior murine BCMA CAR-T treatment.
(All Rights Reserved)