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Investor Relations

Joshua Murray

ir@orcabio.com

Positive Clinical Results from More than 100 Patients Treated with Orca Bio’s Lead Investigational High Precision Cell Therapy Presented at 63rd ASH Annual Meeting

Pooled study results showed significantly higher graft-versus-host disease-free, relapse-free survival rates and improved overall survival rates with Orca-T compared to standard of care

Data from Phase 1b/2 trials include 109 patients with acute myeloid leukemia, acute lymphocytic leukemia, myelodysplastic syndromes, myelofibrosis and other hematological malignancies

Data from eight patients with myelofibrosis who received Orca-T showed regression of marrow fibrosis

Orca-T was manufactured reliably and delivered with vein-to-vein times of 72 hours or less

Company plans to commence Phase 3 study in early 2022

MENLO PARK, CA, Apr. 25, 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 positive new data were presented at the 2022 Transplantation & Cellular Therapy ASTCT and CIBMTR Tandem Meetings in Salt Lake City, Utah.

The new data on Orca Bio’s lead investigational high-precision cell therapy, Orca-T, include updated results from 137 patients with hematologic malignancies, which continued to show an increase in overall survival rates and a reduction of acute and chronic graft versus host disease (GvHD) compared to standard of care; positive outcomes in a subset of patients with myelofibrosis who received Orca-T; and new analyses demonstrating Orca Bio’s manufacturing platform is reliable, robust and scalable.

"These data from an expanded group of patients are very encouraging and demonstrate that Orca-T appears to improve survival while reducing GvHD. This could be a compelling option for patients battling serious hematological malignancies who currently face devastating transplant-related risks," said Everett Meyer, M.D., Ph.D., primary investigator. "These results, combined with the reliable and centralized Orca-T manufacturing, could potentially transform treatment options for patients and physicians."

Orca Bio presented pooled data from 137 patients in the single-center Phase 2 and multi-center Phase 1b trials of Orca-T with acute myeloid leukemia (AML), acute lymphocytic leukemia (ALL) and myelodysplastic syndromes (MDS), with at least 100 days of follow-up and a median of 341 days. For comparison purposes, an independent CIBMTR-based control arm was identified, consisting of similar patients with hematologic malignancies who received a standard of care allogeneic hematopoietic stem cell transplant (“alloHSCT”) over a similar timeframe. Results demonstrated that:

Rates of moderate-to-severe chronic GvHD were low among Orca-T recipients, occurring in only 5% of patients at one year compared to 38% who received a standard alloHSCT.
Orca-T showed the potential for lower rates of moderate-to-severe chronic graft versus host disease (GvHD) at 1 year post-transplant (3% vs. 43%; p<0.0005).
Overall survival rates with Orca-T (90% vs. 78%; p<0.03) and rates of chronic-GvHD-free survival (87% vs. 45%; p<0.0001) were improved.
Orca-T was manufactured reliably and delivered with vein-to-vein times of 72 hours or less across the continental U.S.

Additionally, Orca Bio presented findings from a manufacturing reliability analysis of 100 Orca-T products in the Phase 1b trial. All investigational cell therapies were manufactured at Orca Bio’s cGMP facility in Sacramento, CA, and transplant centers and donor sites were located across the U.S. All products were successfully delivered and infused to patients within 72 hours or less.

"We produce a unique batch of drug for each patient who receives an Orca-T product, and this drug is made up of fresh, living cells that need to be infused on an extremely rapid timeline," said Nate Fernhoff, Ph.D., co-founder and chief scientific officer at Orca Bio. "Reliable and scalable manufacturing have been integral to the development of our therapies since day one. These results not only show that Orca-T continues to reduce GvHD and improve survival rates over time, but that we have maintained the ability to reliably manufacture, deliver and infuse all patients in a timely manner regardless of donor and patient location. This is an important indication of our ability to potentially deliver this therapy urgently and seamlessly to patients in need."

In a separate poster, Orca Bio presented updated data on the treatment impact of Orca-T in 12 patients with myelofibrosis compared to nine patients who received a standard of care alloHSCT. Orca-T recipients had lower incidence of acute and chronic GvHD (33% with Orca-T versus 100% with alloHSCT) and the data suggest Orca-T was well-tolerated. Treatment with Orca-T resulted in engraftment with regression of marrow fibrosis, indicating potential efficacy for the treatment of myelofibrosis.

Based on the favorable results of the Phase 1b and 2 clinical trials, a randomized registrational Phase 3 trial evaluating Orca-T against standard of care alloHSCT, named Precision-T, is now open. More details will be announced in the coming weeks.

Links to the abstracts follow:

The full presentation is available on www.orcabio.com.

“The lower rates of graft versus host disease and improved relapse-free survival suggest Orca-T has the potential to become a safer and more effective treatment option for patients living with serious blood cancers.”

Ivan Dimov, Ph.D., cofounder and chief executive officer of Orca Bio.

About Orca Bio

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Kelsey Grossman

Investor Relations

Joshua Murray

ir @orcabio.com

Orca Bio Presents Data Demonstrating its Lead Investigational High-Precision Cell Therapy Orca-T Significantly Improved Relapse-Free Survival at 64th Annual Meeting

Orca Bio Presents Data Demonstrating its Lead Investigational High-Precision Cell Therapy Orca-T Significantly Improved Relapse-Free Survival at 64th ASH Annual Meeting

Updated data from Phase 1b/2 trials include 151 patients with acute myeloid leukemia, acute lymphocytic leukemia, myelodysplastic syndromes and other hematologic malignancies

Relapse-free survival was 87% at one year in a group of 71 patients who received the preferred conditioning regimen being used in the Precision-T Phase 3 Study of Orca-T

Data also showed improved graft-versus-host disease-free, relapse-free survival rates and overall survival rates at one year with Orca-T compared to standard of care

Precision-T is ongoing and enrolling patients at transplant centers across the U.S.

MENLO PARK, CA, Dec. 10, 2022 – Orca Bio, a late-stage biotechnology company developing high-precision cell therapies for the treatment of cancer, genetic blood disorders and autoimmune diseases, today presented updated positive clinical data on its lead investigational cell therapy, Orca-T, during an oral presentation at the 64th American Society of Hematology (ASH) Annual Meeting.

The data demonstrated a significant improvement in relapse-free survival (RFS) at one year with 87% in 71 patients who received Orca-T and busulfan, fludarabine, and thiotepa (BFT) conditioning. BFT is the preferred conditioning regimen used in Precision-T, the ongoing Phase 3 pivotal study of Orca-T. Additionally, across all 151 patients, there was an increase in graft-versus-host disease, relapse-free survival (GRFS) rates and overall survival rates at one year with Orca-T compared to an independent cohort.

“Today, providers must balance treatment decisions with the goal of fighting cancer while minimizing toxicities. With a standard allogeneic transplant, highly myeloablative conditioning regimens can lead to reduced rates of patient relapse, but can also increase rates of non-relapse mortality,” said Everett Meyer, M.D., Ph.D., primary investigator. “It is encouraging to see that the use of Orca-T across multiple hematological malignancies resulted in a remarkable improvement in relapse-free and overall survival while lowering the rate of serious toxicities compared to standard of care allogeneic hematopoietic stem cell transplants.”

The results of the patient subgroup conditioned with BFT were presented today along with pooled results from the single-center Phase 2 and multi-center Phase 1b trials from 151 patients treated with Orca-T with acute myeloid leukemia (AML), acute lymphocytic leukemia (ALL), myelodysplastic syndromes (MDS) and other hematological malignancies. For comparison purposes, an independent Center for International Blood and Marrow Transplant Research (CIBMTR)-based cohort was identified consisting of patients with AML, ALL or MDS who received a standard of care allogeneic hematopoietic stem cell transplant.

Results demonstrated that patients conditioned with BFT and treated with Orca-T experienced:

87% RFS at one year among all groups, including minimal residual disease positive acute leukemia patients.
81% GRFS at one year.
0% non-relapse mortality and only 5% moderate-to-severe chronic GvHD at one year.
94% overall survival (OS) at one year.

In pooled results from all patients treated with Orca-T, patients experienced:

70% GRFS at one year compared to 21% in the CIBMTR-based cohort.
4% non-relapse mortality at one year compared to 10% in the CIBMTR-based cohort.

88% OS at one year compared to 68% in the CIBMTR-based cohort.

Importantly, Orca-T was manufactured reliably and delivered with vein-to-vein times of 72 hours or less across the U.S.

“These relapse-free and overall survival rates from more than 150 patients treated with Orca-T are very encouraging, and we are extremely pleased to see the strong results of patients who were given the preferred conditioning regimen used in our pivotal Phase 3 trial,” said Ivan Dimov, Ph.D., co-founder and chief executive officer of Orca Bio. “These new data continue to reinforce the potential of this high-precision cell therapy to become a better treatment option for patients and transplant physicians. We remain laser-focused on advancing Orca-T through Precision-T and ultimately on delivering the therapy to more patients in need.”

The full presentation is available on www.orcabio.com.

About Orca-T

Orca-T is an investigational high-precision allogeneic cellular therapy consisting of infusions containing regulatory T-cells, conventional T-cells and CD34+ stem cells derived from peripheral blood from either related or unrelated matched donors. Orca-T has received Regenerative Medicine Advanced Therapy (RMAT) designation from the U.S. Food and Drug Administration and is being studied to treat multiple hematologic malignancies.

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 Presents Encouraging Interim Clinical Data on Orca-Q in Haploidentical Allogeneic Hematopoietic Stem Cell Transplants at 64th ASH Annual Meeting

Orca Bio Presents Encouraging Interim Clinical Data on Orca-Q in Haploidentical Allogeneic Hematopoietic Stem Cell Transplants at 64th Annual ASH Meeting

Orca-Q is Orca Bio's investigational high-precision cell therapy designed to overcome the challenges of haploidentical allogeneic hematopoietic stem cell transplant (alloHSCT)

Interim multi-center Phase 1 clinical trial results show that Orca-Q improved graft-versus-host disease-free, relapse-free survival in haploidentical alloHSCT compared to standard of care, without the use of post-transplant cyclophosphamide

MENLO PARK, CA, Dec. 12, 2022 – 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 interim clinical data from its Phase 1 multi-center trial of its second investigational cell therapy, Orca-Q, were unveiled in an oral presentation at the 64^th American Society of Hematology (ASH) Annual Meeting.

The data from the ongoing clinical trial show that Orca-Q reduced the incidence and severity of graft versus host disease (GvHD) and improved graft-versus-host disease-free, relapse-free survival (GRFS) rates in 26 patients matched to haploidentical allogeneic hematopoietic stem cell donors. Unlike standard of care haploidentical allogeneic stem cell transplant (alloHSCT), Orca-Q does not require post-transplant cyclophosphamide (PTCy).

“Patients and transplant physicians are in urgent need of a novel treatment option that improves the chances of survival and the quality of that survival. This is the key limitation of haploidentical transplant, which is currently the only treatment option for the vast majority of blood cancer patients in need of a transplant,” said Amandeep Salhotra, M.D., associate professor, Division of Leukemia, Department of Hematology and Hematopoietic Cell Transplantation, City of Hope. “These results suggest Orca-Q’s promise to overcome this serious challenge by offering a novel investigational high-precision cell therapy with the potential to significantly improve patient outcomes and reduce serious transplant-related risks.”

Orca-Q is an investigational high-precision cell therapy that is a proprietary composition of enriched CD34+ stem cells combined with specific T cell subsets. The findings presented at ASH are from patients with acute myeloid leukemia (AML), acute lymphoblastic leukemia (ALL), myelodysplastic syndromes (MDS) and chronic myeloid leukemia (CML) who were matched to haploidentical allogeneic donors, defined as matched across at least 4/8 but fewer than 7/8 human leukocyte antigen (HLA) loci. Historical controls from the literature of patients who received standard of care haploidentical alloHSCT with PTCy GvHD prophylaxis were used for comparison purposes^1,2,3,4.

Interim results from the Phase 1 single-arm, open-label trial showed:

A reduction of grade 2-4 acute GvHD (aGvHD) at 6 months as compared to literature controls (13% vs 21-63%), with only one patient developing grade 3 aGvHD and no incidence of grade 4 aGvHD.

No patients experienced moderate-to-severe chronic GvHD (cGvHD), compared to 24%-33% in the literature control. There was only one case of mild cGvHD.
GRFS was 75% at one year after Orca-Q, which compares favorably to a GRFS of 46% in patients in the literature control.

Patients treated with Orca-Q also experienced a low adverse event profile, suggesting Orca-Q has the potential to offer a new treatment option for patients undergoing haploidentical alloHSCT.

Today, approximately 70% of blood cancer patients do not have access to a fully matched related donor. Haploidentical transplant, which uses healthy, blood-forming cells from a partially matched donor to replace the unhealthy ones, is one of the few treatment options currently available to those without a fully matched donor. However, its use remains significantly limited because of the conditioning regimens that are required. Haploidentical transplant patients receiving higher intensity myeloablative conditioning treatments have a higher risk of cGvHD post-transplant, while patients receiving lower intensity pre-transplant conditioning have a greater risk of relapse.

“These interim results from our second clinical program demonstrate Orca-Q’s potential to overcome the challenges of haploidentical alloHSCT by providing a solution with which patients and physicians may no longer have to compromise between the risk of relapse and the risk of GvHD,” said Scott McClellan, M.D., Ph.D., chief medical officer of Orca Bio. “This novel approach, along with our growing body of clinical evidence demonstrating Orca-T’s improved GvHD and relapse-free survival rates in patients with HLA-matched donors, underscore the potential of our high-precision platforms to deliver cell therapies that can greatly expand the number of patients who receive life-saving treatment, whether their donor is a full or partial match.”

The full presentation is available on www.orcabio.com.

About Orca-Q

Orca-Q is Orca Bio's second investigational high-precision allogeneic cellular therapy to enter clinical development for hematological malignancies. Orca-Q is a proprietary composition of enriched CD34+ stem cells combined with specific T cell subsets derived from haploidentical—or partially matched—donors that are purified through Orca Bio's high-precision platform. Orca-Q is a first-in-class therapy that has the potential to improve patient outcomes and reduce the risks of graft versus host disease, without the use of post-transplant cyclophosphamide (PTCy) in patients for whom a full human leukocyte antigen (HLA) match cannot be found.

About Orca-T

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.

1 Gooptu, M, et al. Blood. 2021; 138 (3): 273–282.

2 Sanz, J, et al. J Hematol Oncol. 2020; 13:46.

3 Baker, M, et al. Biol Blood Marrow Transplant. 2016; 22; 2047-2055.

4 Sanz, J, et al. J Hematol Oncol. 2020; 13:46.

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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

ir@orcabio.com

Orca Bio to Present at the 42nd Annual J.P. Morgan Healthcare Conference

MENLO PARK, CA, Jan. 3 – 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 Ivan Dimov, Ph.D., Orca Bio’s co-founder and chief executive officer, will present at the 42nd Annual J.P. Morgan Healthcare Conference.

The company presentation will take place on Monday, January 8, 2024, at 2:00PM PST at the Westin St. Francis in the Golden Gate Room on the 32nd floor.

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.

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Corporate Communications

Kelsey Grossman

Investor Relations

Joshua Murray

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

Contact:

Corporate Communications

Kelsey Grossman

Investor Relations

Joshua Murray