Press release

Investor Relations

Joshua Murray

ir@orcabio .com

Orca Bio Presents Promising Data on Orca-T in Two Oral Presentations at the 2024 Tandem Meetings of ASTCT® and CIBMTR®

Orca-T, Orca Bio’s lead investigational high-precision cell therapy, showed favorable rates of relapse-free survival, non-relapse mortality and overall survival when compared to a non-randomized, historical cohort of post-transplant cyclophosphamide (PTCy) in a retrospective analysis

Orca-T demonstrated similar results in older and younger patients with hematologic malignancies undergoing myeloablative conditioning

Orca-T is currently being evaluated in a pivotal Phase 3 clinical study at transplant centers across the U.S. for the treatment of multiple hematologic malignancies

MENLO PARK, CA, Feb. 23, 2024 – Orca Bio, a late-stage biotechnology company developing high-precision cell therapies for the treatment of cancer, autoimmune diseases and genetic blood disorders, today announced positive data on its lead investigational high-precision cell therapy, Orca-T, presented at the 2024 Tandem Meetings, Transplantation & Cellular Therapy Meetings of the American Society for Transplantation and Cellular Therapy (ASTCT) and the Center for International Blood and Marrow Transplant Research (CIBMTR).

In the first of two oral presentations, findings from a retrospective analysis compared historical outcomes between Orca-T and a standard of care allogeneic stem cell transplant (alloHSCT) plus post-transplant cyclophosphamide (PTCy)-based graft versus host disease (GvHD) prophylaxis in patients with hematologic malignancies receiving myeloablative conditioning (MAC). Within the non-randomized cohorts of varying conditioning regimens and disease types, Orca-T demonstrated favorable results across clinical outcomes including relapse-free survival (RFS), non-relapse mortality (NRM) and overall survival (OS).

“When treating hematological malignancies, physicians are often faced with compromising between the risk of relapse and the risk of serious toxicities, all of which can impact overall patient survival,” said Alexandra Gomez-Arteaga, MD, Assistant Professor of Medicine at Weill Cornell Medicine, hematologist oncologist in the Bone Marrow Transplant and Cellular Therapy Program at NewYork-Presbyterian/Weill Cornell Medical Center, and presenting author. “While advances in prophylaxis agents have demonstrated improvements in reducing the rate of graft versus host disease, the findings of this retrospective analysis suggest Orca-T may also provide benefits across key survival metrics, further highlighting the importance of identifying novel approaches that may offer enhancements across all patient outcomes.”

The analysis further compared a subgroup of 48 patients from Orca Bio’s multi-center Phase 1b trial who received a MAC Orca-T with single-agent tacrolimus (TAC) and a conditioning regimen of busulfan, fludarabine and thiotepa (BFT) which is being used in the pivotal Phase 3 clinical study of Orca-T, with 61 patients from the CIBMTR literature-based cohort who received an alloHSCT with a combination of PTCy, calcineurin inhibitor (CNI) and mycophenolate mofetil (MMF). The analysis included patients with acute myeloid leukemia (AML) and myelodysplastic syndromes (MDS) who had a median follow-up time of 15 months and 12 months in the Orca-T and PTCy cohorts, respectively. The outcomes at 12 months are summarized in the table below:

	Orca-T with BFT/TAC	Standard alloHSCT with CNI/MMF/PTCy
RFS	86%	63%
NRM	0%	17%
OS	100%	76%

In a second oral presentation, results were shared from a subgroup analysis of Orca Bio’s ongoing multi-center Phase 1b clinical trial of patients with AML, MDS and acute lymphocytic leukemia (ALL) who received Orca-T and BFT conditioning. The findings demonstrated Orca-T’s potential ability to deliver similar outcomes in older patients (55+ years of age, n=25) and younger patients (18-54 years of age, n=39) undergoing MAC. Notably, Orca-T delivered similar results across RFS (84.8% in younger patients and 82.3% in older patients), NRM (0% in both groups) and OS (100% and 95.5% in the younger and older patient groups, respectively). Across all patients, Orca-T continued to be manufactured reliably and delivered with vein-to-vein times of 72 hours or less across the U.S. These data were previously presented at the 65th American Society of Hematology (ASH) Annual Meeting in December 2023.

“We are pleased to present findings that reinforce the potential for Orca-T to address the balancing act that providers encounter when working to achieve a lasting cure while reducing toxicities,” said Scott McClellan, MD, PhD, Chief Medical Officer at Orca Bio. “The ability of Orca-T to potentially treat the disease while also lowering treatment-related mortality, including for patients of a more advanced age, could arm physicians with an important new therapeutic option. We look forward to continued investigation of Orca-T in our randomized Phase 3 study, Precision-T.”

About Orca-T

Orca-T is an investigational high-precision allogeneic cell therapy being evaluated in clinical trials for the treatment of multiple hematologic malignancies. Orca-T includes infusions containing regulatory T-cells, CD34+ stem cells and conventional T-cells derived from peripheral blood from either related or unrelated matched donors. Orca-T is currently being evaluated in a pivotal Phase 3 clinical trial at leading transplant centers across the U.S. and has received Regenerative Medicine Advanced Therapy (RMAT) designation from the U.S. Food and Drug Administration.

About Orca Bio

Orca Bio is a late-stage biotechnology company developing high-precision cell therapies for the treatment of cancer, autoimmune diseases and genetic blood disorders. Our investigational products are designed to safely replace a patient’s diseased blood and immune system with a healthy one, delivering significantly better outcomes with dramatically fewer risks than the standard of care. Our manufacturing platform uses single-cell precision to create proprietary, uniquely-defined products that have the potential to transform allogeneic cell therapy. At Orca Bio, our mission is to make curative cell therapies both more effective and safer, and in doing so, push past the field’s current boundaries and redefine its future. For more information, visit www.orcabio.com and follow Orca Bio on Twitter: @OrcaBio.

Contact:

Corporate Communications

Kelsey Grossman

Investor Relations

Joshua Murray

ir@orcabio .com

Orca Bio Announces Completion of Patient Enrollment for the Precision-T Phase 3 Study of Orca-T

Precision-T over-enrolled with 187 total patients at 19 clinical trial sites across the U.S.

Topline results expected in 1H 2025

MENLO PARK, CA, June 5, 2024 – Orca Bio, a biotechnology company committed to transforming the lives of patients through high-precision cell therapy, today announced that it has completed enrollment in the pivotal Precision-T Phase 3 clinical study.

A randomized, open-label multicenter study, Precision-T (NCT05316701) is evaluating the safety and efficacy of Orca Bio’s lead investigational allogeneic T-cell immunotherapy, Orca-T, compared to a standard of care allogeneic hematopoietic stem cell transplant (alloHSCT) in patients with acute myeloid leukemia (AML), acute lymphocytic leukemia (ALL) and high-risk myelodysplastic syndrome (MDS). Orca-T is a donor-derived product designed to replace a patient’s diseased blood and immune system with a healthy one.

“Completing enrollment in our multicenter Phase 3 study of Orca-T is an important milestone toward our ultimate goal of delivering a potentially life-saving product to patients who have long had to settle for a standard of care that carries significant risks,” said Ivan Dimov, Ph.D., co-founder and chief executive officer of Orca Bio. “We’re immensely grateful to the patients, their families and the trial site investigators who participated in our study, and look forward to sharing pivotal data in the near future with the broader blood cancer community.”

The primary endpoint of the Precision-T study is the rate of survival free from moderate-to-severe chronic graft versus host disease (GvHD). Secondary endpoints include time to moderate-to-severe chronic GvHD, graft-versus-host-disease and relapse-free survival (GRFS) and overall survival. Topline results from the study are expected in the first half of 2025. The study has enrolled 187 patients, exceeding the original target of 174 patients.

Orca-T is designed to deliver improved outcomes for patients while overcoming the limitations of standard alloHSCT, which carries the risk of serious complications and treatment-related mortality. Orca-T uses highly purified regulatory T cells with the goal of reducing the tradeoff between the risk of relapse and the risk of serious toxicity, a primary objective of the cell therapy field. Orca-T has demonstrated promising results in early single-arm trials which were recently presented at the 2024 American Society of Clinical Oncology (ASCO) Annual Meeting the Annual Meeting of the EBMT, the 2024 Tandem Meetings of ASTCT® and CIBMTR® and the American Society of Hematology (ASH) Annual Meeting.

More information about the Precision-T study can be found at www.precisiontstudy.com or www.clinicaltrials.gov.

About Orca-T

Orca-T is an investigational allogeneic T-cell immunotherapy being evaluated in clinical trials for the treatment of multiple hematologic malignancies. Orca-T is comprised of highly purified regulatory T-cells, CD34+ stem cells and conventional T-cells derived from peripheral blood from either related or unrelated matched donors. Orca-T is currently being evaluated in a pivotal Phase 3 clinical trial at leading transplant centers across the U.S. and has received Regenerative Medicine Advanced Therapy (RMAT) designation from the U.S. Food and Drug Administration.

About Orca Bio

Orca Bio is a late-stage biotechnology company developing high-precision cell therapies for the treatment of cancer, autoimmune diseases and genetic blood disorders. Our investigational products are designed to safely replace a patient’s diseased blood and immune system with a healthy one, delivering significantly better outcomes with dramatically fewer risks than the standard of care. Our manufacturing platform uses single-cell precision to create proprietary, uniquely-defined products that have the potential to transform allogeneic cell therapy. At Orca Bio, our mission is to make curative cell therapies both more effective and safer, and in doing so, push past the field’s current boundaries and redefine its future. For more information, visit www.orcabio.com and follow Orca Bio on X: @OrcaBio.

Contact:

Corporate Communications

Kelsey Grossman

Investor Relations

Joshua Murray

Orca-T Results in High GVHD-Free and Relapse-Free Survival Following Myeloablative Conditioning for Hematological Malignancies: Results of a Single Center Phase 2 and a Multicenter Phase 1b Study

Orca Bio to Present New Clinical Data on Orca-T at the 63rd American Society of Hematology Annual Meeting

Oral and poster presentations will include one-year follow-up data from an expanded group of patients and an analysis of treatment outcomes in patients with myelofibrosis

MENLO PARK, CA, November 4, 2021 – Orca Bio, a clinical-stage biotechnology company developing purified, high-precision cell therapies for cancer, autoimmune and genetic blood disorders, today announced that new data will be presented from a single-center Phase 2 trial and a multi-center Phase 1b trial at the American Society of Hematology (ASH) Annual Meeting. Specifically, pooled data from patients treated with Orca-T, an investigational high-precision cell therapy product being studied in patients with hematologic malignancies, will be shared in an oral presentation. Additionally, results of Orca-T in a subset of patients with myelofibrosis from those same trials will be shared in a poster presentation.

“Our clinical experience with Orca-T has grown significantly over the past year and we are pleased to present data on an expanded group of patients who now have one year of follow-up with Orca-T,” said Ivan Dimov, Ph.D., cofounder and chief executive officer of Orca Bio. “We look forward to presenting these important findings at ASH as we continue to work to deliver on our promise of maximizing patient survival while minimizing the compromise of toxicities to enable better outcomes.”

The ASH abstracts are now available at www.hematology.org.

Details of the Orca Bio presentations follow:

Abstract Number: 98

Session: 722. Allogeneic Transplantation: Acute and Chronic GVHD, Immune Reconstitution: Prevention of graft vs. host disease after allogeneic hematopoietic cell transplantation

Presentation Date: Saturday, December 11, 2021, at 9:45 AM EST

Location: Georgia World Congress Center, B302-B303

Poster Presentation: Outcomes for Myelofibrosis Patients Following Myeloablative Allogeneic Stem Cell Transplantation Using the Orca-T Graft from HLA-Matched Related and Unrelated Donors

Abstract Number: 1819

Session: 722. Allogeneic Transplantation: Acute and Chronic GVHD, Immune Reconstitution: Poster I

Presentation Date: Saturday, December 11, 2021, at 5:30 PM – 7:30 PM EST

Location: Georgia World Congress Center, Hall B5

About Orca Bio

Orca Bio is a late-stage biotechnology company developing purified, high-precision cell therapies for the treatment of cancer, autoimmune diseases and genetic blood disorders. Our investigational therapies are designed to deliver better survival rates with dramatically fewer risks than the standard of care. At Orca Bio, we hope to not only replace patients' blood and immune systems with healthy ones, but restore their quality of life. For more information, visit www.orcabio.com and follow Orca Bio on Twitter: @orcabio.

Contact:

Corporate Communications

Kelsey Grossman

Investor Relations

Joshua Murray

Orca Bio to Present Positive Clinical Data on Orca-T at the 50th Annual Meeting of the EBMT

Presentations include data from an expanded group of older patients treated with Orca Bio’s investigational high-precision cell therapy, Orca-T, and reduced intensity conditioning

MENLO PARK, CA, April 11, 2024 – Orca Bio, a late-stage biotechnology company developing high-precision cell therapies for the treatment of cancer, autoimmune diseases and genetic blood disorders, today announced new data will be presented during the 50th Annual Meeting of the EBMT in Glasgow, United Kingdom.

Specifically, results from a single-center open-label Phase 1 clinical trial of an expanded group of older patients (n=20) treated with Orca Bio’s lead investigational high-precision cell therapy, Orca-T, and a reduced intensity conditioning (RIC) regimen will be presented. Preliminary data with Orca-T and RIC in patients with hematologic malignancies showed encouraging rates of relapse-free survival (77%). With a median follow-up of 9.65 months, no patients have experienced relapse to date (0%), demonstrating the curative potential for Orca-T in this historically challenging to treat patient group. An earlier dataset evaluating Orca-T and RIC in this population was presented at the 2023 American Society of Hematology (ASH) Annual Meeting.

A second presentation will highlight findings from a non-randomized retrospective analysis comparing Orca-T plus single-agent tacrolimus with a standard of care allogeneic stem cell transplant (alloHSCT) plus post-transplant cyclophosphamide (PTCy)-based graft versus host disease (GvHD) prophylaxis in patients with hematologic malignancies receiving myeloablative conditioning (MAC). When compared to the historical PTCy cohort in this patient population, Orca-T offered potentially favorable rates of relapse-free survival, non-relapse mortality and overall survival. These data were previously presented at the 2024 Tandem Meetings, Transplantation & Cellular Therapy Meetings of the American Society for Transplantation and Cellular Therapy (ASTCT) and the Center for International Blood and Marrow Transplant Research (CIBMTR).

“At Orca Bio, we continue to build clinical evidence to support the profile of Orca-T and its potential to expand life-saving treatment to patients while also reducing treatment-related risks,” said Scott McClellan, M.D., Ph.D., chief medical officer at Orca Bio. “We look forward to joining top healthcare professionals from around the world at EBMT and sharing the latest findings that support the potential for Orca-T to offer a new curative solution for providers and their patients.”

The EBMT abstracts are available at https://www.ebmt.org/.

Details of the Orca Bio presentations follow:

Title: Phase 1 Trial Results for Patients with Advanced Hematologic Malignancies Treated with Orca-T Cell Therapy with Reduced Intensity Conditioning and Single Agent Tacrolimus

Poster Code: A121

Date and Time: Monday, April 15, 2024 at 18:00 BST

Location: Hall 3 North

Title: A Retrospective Analysis Comparing Orca-T to Post-Transplant Cyclophosphamide Based Allogeneic Hematopoietic Stem Cell Transplant in Patients with Matched Unrelated Donors Receiving Myeloablative Conditioning

Poster Code: A107

Date and Time: Monday, April 15, 2024 at 18:00 BST

Location: Hall 3 North

About Orca-T

About Orca Bio

Orca Bio is a late-stage biotechnology company developing high-precision cell therapies for the treatment of cancer, autoimmune diseases and genetic blood disorders. Our investigational products are designed to safely replace a patient’s diseased blood and immune system with a healthy one, delivering significantly better outcomes with dramatically fewer risks than the standard of care. Our manufacturing platform uses single-cell precision to create proprietary, uniquely-defined products that have the potential to transform allogeneic cell therapy. At Orca Bio, our mission is to make curative cell therapies both more effective and safer, and in doing so, push past the field’s current boundaries and redefine its future. For more information, visit www.orcabio.com and follow Orca Bio on Twitter: @OrcaBio.

Contact:

Corporate Communications

Kelsey Grossman

Investor Relations

Joshua Murray

Orca Bio to Present New Clinical Data on Orca-T at the European Hematology Association 2022 Congress

MENLO PARK, CA, May 12, 2022 – Orca Bio, a clinical-stage biotechnology company developing purified, high-precision cell therapies for the treatment of cancer, genetic blood disorders and autoimmune diseases, today announced that new clinical data on its lead investigational high-precision cell therapy, Orca-T, will be shared in an oral presentation at the hybrid European Hematology Association (EHA) Congress from June 9-17, 2022, in Vienna, Austria.

Oral Session: Clinical Studies in Transplantation

Title: Orca-T, an Engineered Allograft, Results in High GVHD-Free and Relapse-Free Survival Following Myeloablative Conditioning for Hematological Malignancies

Abstract Number: S237

Date and Time: Sunday, June 12, at 11:30–12:45 CEST / 5:30AM–6:45AM EDT

Location: Hall Stolz 1-2

The presentation will highlight results from the single-center Phase 2 and multi-center Phase 1b trials of Orca-T in patients with acute myeloid leukemia (AML), acute lymphocytic leukemia (ALL) and myelodysplastic syndromes (MDS). Data included in the abstract will be updated at the time of presentation.

The oral session will take place in Vienna and will be livestreamed on the EHA Congress platform.

About Orca Bio

Contact:

Corporate Communications

Kelsey Grossman

Investor Relations

Joshua Murray

Orca Bio to Present at the 41st Annual J.P. Morgan Healthcare Conference

MENLO PARK, CA, Jan. 6, 2023 – Orca Bio, a late-stage biotechnology company developing high-precision cell therapies for the treatment of cancer, genetic blood disorders and autoimmune diseases, today announced that Ivan Dimov, Ph.D., Orca Bio’s co-founder and chief executive officer, will present at the 41st Annual J.P. Morgan Healthcare Conference.

The company presentation will take place on Monday, January 9, 2023, at 7:30 AM PST at the Westin St. Francis in the Mission Bay Room on the 32nd floor.

About Orca Bio

Orca Bio is a late-stage biotechnology company developing purified, high-precision cell therapies for the treatment of cancer, autoimmune diseases and genetic blood disorders. Our investigational therapies are designed to deliver better survival rates with dramatically fewer risks than standard allogeneic stem cell transplants, like graft versus host disease and other debilitating transplant-related toxicities. At Orca Bio, we hope to not only replace patients' blood and immune systems with healthy ones, but restore their quality of life. For more information, visit www.orcabio.com and follow Orca Bio on Twitter: @orcabio.

Contact:

Corporate Communications

Investor Relations

Joshua Murray

Orca Bio to Present Positive Clinical Data on its Novel High-Precision Cell Therapies at the 65th American Society of Hematology Annual Meeting

The first oral presentation will demonstrate the performance of Orca-T in patients over 55 years of age compared with younger patients

A second oral presentation will highlight Orca-Q, Orca Bio’s high-precision cell therapy for patients with haploidentical donors

Additional poster presentations include outcomes in patients with high-risk myelodysplastic syndrome treated with Orca-T and results of Orca-T in patients undergoing reduced intensity conditioning

MENLO PARK, CA, November 2, 2023 – Orca Bio, a late-stage biotechnology company developing high-precision cell therapies for the treatment of cancer, autoimmune diseases and genetic blood disorders, today announced that new data will be presented at the American Society of Hematology (ASH) Annual Meeting from December 9-12 in San Diego, CA. Specifically, an oral presentation will highlight the outcomes of myeloablative Orca-T, Orca Bio’s lead investigational high-precision cell therapy, in patients over the age of 55. A second oral presentation will share updated results in an expanded group of patients with haploidentical donors treated with Orca Bio’s second investigational high-precision cell therapy, Orca-Q.

Orca Bio will also present two posters highlighting the results of patients with high-risk myelodysplastic syndrome who were treated with Orca-T, and the outcomes of patients treated with Orca-T who received reduced intensity conditioning.

The ASH abstracts are now available at www.hematology.org. Details of the Orca Bio presentations follow:

Oral Session: 721. Allogeneic Transplantation: Conditioning Regimens, Engraftment and Acute Toxicities: Optimizing Conditioning Regimens for Lymphoid Malignancies and Fanconi Anemia

Title: Optimizing Outcomes with Myeloablative Conditioning in Older Patients: Efficacy and Safety of Precision Engineered Orca-T in Patients > 55 Years Old with Hematologic Malignancies

Abstract Number: 230

Date and Time: Saturday, December 9, 2023 at 2:15 PM PT

Location: Marriott Marquis, Marriott Grand Ballroom 5-6

Oral Session: 704. Cellular Immunotherapies: Early Phase and Investigational Therapies: Novel Approaches to Enhance Cellular Therapies and Immune Responses in Leukemias and Lymphomas

Title: Safety and Efficacy of Orca-Q with Haploidentical Donors for the Treatment of Advanced Hematologic Malignancies Without the Use of Post-Transplant Cyclophosphamide

Abstract Number: 773

Date and Time: Monday, December 11, 2023 at 11:30 AM PT

Location: San Diego Convention Center, Room 6CF

Poster Session: 732. Allogeneic Transplantation: Disease Response and Comparative Treatment Studies

Title: High Disease-Free Survival in Patients with High-Risk MDS Treated with Orca-T

Abstract Number: 2230

Date and Time: Saturday, December 9, 2023 at 5:30 PM PT

Location: San Diego Convention Center, Halls G-H

Poster Session: 722. Allogeneic Transplantation: Acute and Chronic GVHD, Immune Reconstitution

Title: Phase 1 Trial Results for Patients with Advanced Hematologic Malignancies Undergoing Reduced Intensity Allogeneic HCT with Orca-T Donor Cell Therapy Product and Single Agent Tacrolimus

Abstract Number: 3560

Date and Time: Sunday, December 10, 2023 at 6:00 PM PT

Location: San Diego Convention Center, Halls G-H

About Orca-T

Orca-T is an investigational high-precision allogeneic cell therapy for the treatment of multiple hematological malignancies. Orca-T includes infusions containing regulatory T-cells, CD34+ stem cells and conventional T-cells derived from peripheral blood from either related or unrelated matched donors. Orca-T is currently being evaluated in a pivotal Phase 3 clinical trial at leading transplant centers across the U.S. and has received Regenerative Medicine Advanced Therapy (RMAT) designation from the U.S. Food and Drug Administration.

About Orca-Q

Orca-Q is an investigational high-precision allogeneic cell therapy designed to treat hematological malignancies in patients with haploidentical donors. Orca-Q is a proprietary composition of stem cells combined with specific T-cell subsets derived from healthy donors and engineered by Orca Bio’s high-precision platform. Orca-Q has the potential to improve patient outcomes and reduce the risks of toxicities without the use of post-transplant cyclophosphamide (PTCy) in patients unable to identify a full human leukocyte antigen (HLA) match.

About Orca Bio

Orca Bio is a late-stage biotechnology company developing high-precision cell therapies for the treatment of cancer, autoimmune diseases and genetic blood disorders. Our investigational products are designed to safely replace a patient’s diseased blood and immune system with a healthy one, delivering significantly better outcomes with dramatically fewer risks than the standard of care. Our manufacturing platform uses single-cell precision to create proprietary, uniquely-defined products that have the potential to transform allogeneic cell therapy. At Orca Bio, our mission is to make curative cell therapies both more effective and safer, and in doing so, push past the field’s current boundaries and redefine its future. For more information, visit www.orcabio.com and follow Orca Bio on Twitter: @OrcaBio.

Contact:

Corporate Communications

Kelsey Grossman

Investor Relations

Joshua Murray