92% (12/13) overall response rate (ORR) for relapsed/refractory AL Amyloidosis patients enrolled in NEXICART-1:

• 12 out of 12 patients not exposed to prior BCMA-targeted bispecific responded to NXC-201 (100% ORR), of which 9 out of 12 were complete responders (75% CRs)

• 1 patient with prior exposure to BCMA-targeted bispecific treatment did not respond

• Best responder duration of response was 28.0 months with response ongoing as of May 10, 2024
  
• U.S. prevalence of relapsed/refractory AL Amyloidosis is growing 12% per year according to Staron, et al Blood Cancer Journal, estimated to reach 33,277 patients in 2024

LOS ANGELES, May 10, 2024 (GLOBE NEWSWIRE) -- Immix Biopharma, Inc. (“ImmixBio”, “Company”, “We” or “Us” or ”IMMX”), a clinical-stage biopharmaceutical company trailblazing cell therapies in autoimmune disease, today announced new clinical data from its Phase 1b/2a NEXICART-1 (NCT04720313) study of novel, autologous, sterically-optimized BCMA-targeted chimeric antigen receptor T (CAR-T) cell therapy, NXC-201, in patients with relapsed/refractory AL Amyloidosis (R/R ALA) in a late breaking oral presentation at the 27^th Annual Meeting of The American Society of Gene and Cell Therapy (ASGCT) in Baltimore, MD. All patients were relapsed/refractory to standards-of-care Dara-CyBorD (daratumumab combined with cyclophosphamide, bortezomib, and dexamethasone).

“Relapsed/refractory AL Amyloidosis remains an unmet medical need, with no approved options for treatment,” said Polina Stepensky, M.D., Director of the Hadassah Medical Organization’s Department of Bone Marrow Transplantation and Immunotherapy for Adults and Children, and NEXICART-1 principal study investigator. “We continue to be encouraged by NXC-201’s response rates and durable effect in patients without significant pre-existing cardiac damage, exemplified by our 28-month longest responder with response ongoing.”

“We are excited to present clinical data from the NEXICART-1 clinical study at ASGCT. This study has informed the design of NEXICART-2 clinical trial, expected to open in the U.S. mid-2024,” said Ilya Rachman, M.D., Ph.D., Chief Executive Officer of Immix Biopharma. Gabriel Morris, Chief Financial Officer of Immix Biopharma, added: “We believe NXC-201’s tolerability profile, including lack of neurotoxicity, makes it uniquely suitable as a potential new treatment option for relapsed/refractory AL Amyloidosis patients.”

At the NXC-201 ASGCT 2024 late-breaking oral presentation, data were presented from 13 relapsed/refractory AL amyloidosis patients (including 3 new patients) in the ongoing Phase 1b/2a NEXICART-1 study. Patients were infused with CAR+T cells at doses of 150 x 10⁶ (n=1), 450 x 10⁶ (n=2), and 800 x 10⁶ (n=10).

Patient characteristics:

• 85% (11/13) had cardiac involvement
• 38% (5/13) had New York Heart Association (NYHA) stage 3 or 4 heart failure
• 38% (5/13) had Mayo stage 3 AL amyloidosis disease
• Relapsed/refractory to a median 4 lines of prior therapy (range: 3-10)
• 1 patient, patient 11, was treated and progressed on a BCMA-targeted bispecific antibody before NXC-201 treatment

Safety and efficacy data:

• Overall response rate (ORR) of 92% (12/13) for relapsed/refractory AL Amyloidosis patients enrolled in NEXICART-1:
  • 12 out of 12 patients not exposed to prior BCMA-targeted bispecific responded to NXC-201 (100% ORR), of which 9 out of 12 were complete responders (75% CRs)
  • 1 patient with prior exposure to BCMA-targeted bispecific treatment did not respond
• Best responder had a duration of response of 28.0 months as of May 10, 2024, with response ongoing
• There were no immune effector cell-associated neurotoxicity syndrome (ICANS) events
• Median cytokine release syndrome (CRS) duration was 2 days (range: 1-5):
  • No grade 4 CRS events
  • 2 experienced no CRS; 3 experienced grade 1 CRS; 6 Experienced grade 2 CRS; 2 experienced grade 3 CRS

The NXC-201 27^th Annual Meeting of The American Society of Gene and Cell Therapy (ASGCT) late-breaking oral presentation can be accessed on the ImmixBio corporate website at this link: https://immixbio.com/pipeline/#publications

ASGCT 2024 Presentation Details:

About NEXICART-1
NEXICART-1 (NCT04720313) is an ongoing Phase 1b/2a, open-label study evaluating the safety and efficacy of NXC-201 (formerly HBI0101), in adults with relapsed/refractory multiple myeloma and relapsed/refractory AL amyloidosis. The primary objective of the Phase 1b portion of the study is to characterize the safety and confirm the recommended Phase 2 dose (RP2D) of NXC-201. The Phase 1b portion has been successfully completed, with a recommended Phase 2 dose (RP2D) of 800 million CAR+T cells.

About NEXICART-2
NEXICART-2 (NCT06097832) is an open-label, single-arm, multi-site Phase 1b dose expansion clinical trial in relapsed/refractory AL Amyloidosis for CAR-T NXC-201 in the United States. Over a period of approximately 18 months from first patient dosing, NEXICART-2 is expected to enroll 40 patients with adequate cardiac function who have not been exposed to prior BCMA-targeted therapy. The objectives are the safety and efficacy of NXC-201. The expected primary endpoints are complete response rate and overall response rate according to consensus recommendations (Palladini et al. 2012).

About NXC-201
NXC-201 is a sterically-optimized BCMA-targeted chimeric antigen receptor T (CAR-T) cell therapy, which we believe has the potential to be the only “Single-Day CRS” CAR-T, targeting AL Amyloidosis and other autoimmune diseases. It is being studied in a comprehensive clinical development program for the treatment of patients with relapsed/refractory AL amyloidosis, and expanding into other autoimmune indications. These trials build on a robust NXC-201 clinical dataset initiated in February 2021. NXC-201 has been awarded Orphan Drug Designation (ODD) by the FDA in both AL Amyloidosis and multiple myeloma, and awarded EU ODD by the EMA in multiple myeloma and AL Amyloidosis.

About AL Amyloidosis
AL amyloidosis is a systemic disorder caused by an abnormality of plasma cells in the bone marrow. Misfolded amyloid proteins produced by plasma cells cause buildup in and around tissues, nerves and organs, gradually affecting their function. This can cause progressive and widespread organ damage, and high mortality rates.

U.S. observed prevalence of relapsed/refractory AL Amyloidosis is growing 12% per year according to Staron, et al Blood Cancer Journal, estimated to reach 33,277 patients in 2024. The Amyloidosis market was $3.6 billion in 2017, expected to reach $6 billion in 2025, according to Grand View Research.

About Immix Biopharma, Inc.

Immix Biopharma, Inc. (ImmixBio) (Nasdaq: IMMX) is a clinical-stage biopharmaceutical company trailblazing cell therapies in AL Amyloidosis and other autoimmune diseases. Our lead cell therapy is sterically-optimized BCMA-targeted chimeric antigen receptor T (CAR-T) cell therapy NXC-201, currently being evaluated in the ongoing Phase 1b/2 NEXICART-1 (NCT04720313) clinical trial. NXC-201 has the potential to be the world’s first “Single-Day CRS” CAR-T, enabling the potential for a faster return home for patients and supporting ongoing expansion into autoimmune indications. NXC-201 has been awarded Orphan Drug Designation (ODD) by the FDA in both AL Amyloidosis and multiple myeloma, and ODD by the European Commission (EMA) in multiple myeloma and AL Amyloidosis. Learn more at www.immixbio.com and www.BeProactiveInAL.com.

Forward Looking Statements

This press release contains forward-looking statements regarding Immix Biopharma, Inc., including the potential benefits of our initial product candidates, CAR-T NXC-201 and IMX-110. Forward-looking statements include, but are not limited to, our plans, objectives, expectations and intentions and other statements that contain words such as “expects,” “contemplates,” “anticipates,” “plans,” “intends,” “believes”, “estimates”, “potential” and variations of such words or similar expressions that convey the uncertainty of future events or outcomes, or that do not relate to historical matters. Those forward-looking statements involve known and unknown risks, uncertainties and other factors that could cause actual results to differ materially. Among those factors are: (i) the risk that the further data from the ongoing Phase 1b/2a clinical trials for CAR-T NXC-201 and IMX-110 will not be favorably consistent with the initial data initial data readouts, (ii) the risk that the Company may not be able to advance to registration-enabling studies for the CAR-T NXC-201 and IMX-110 product candidates, (iii) success in early phases of pre-clinical and clinicals trials do not ensure later clinical trials will be successful; (iv) no drug product developed by the Company has received FDA pre-market approval or otherwise been incorporated into a commercial drug product, (v) the risk that the Company may not be able to obtain additional working capital with which to continue the clinical trials for CAR-T NXC-201 or IMX-110, or advance to the initiation of registration-enabling studies, for such product candidates as and when needed and (vii) those other risks disclosed in the section “Risk Factors” included in the Company’s Annual Report on Form 10-K filed with the SEC on March 29, 2024 and other periodic reports subsequently filed with the Securities and Exchange Commission. Immix Biopharma cautions readers not to place undue reliance on any forward-looking statements. Immix Biopharma does not undertake, and specifically disclaims, any obligation to update or revise such statements to reflect new circumstances or unanticipated events as they occur, except as required by law.

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