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Abveris Announces Multi-Target, Multi-Year Therapeutic Antibody Discovery Collaboration with Prometheus Biosciences

Abveris, Biosciences | November 12, 2021

Abveris, a leader in antibody drug discovery announced that Prometheus Biosciences and Abveris have entered a multi-year collaboration to develop therapeutic antibodies against multiple targets. The partnership will expand Abveris's role in supporting the rapid development of the Prometheus Biosciences portfolio. The results of the collaboration will bring promising new therapeutics to patients suffering from a variety of immune-mediated diseases.

Under this partnership agreement, Abveris will utilize its proprietary DiversimAbTM hyperimmune mouse technology in combination with humanized mice to develop antibodies against several novel therapeutic targets. Capitalizing on the use of its industry-leading rapid B cell screening platform powered by the Berkeley Lights Beacon®, Abveris will identify promising antibody drug candidates via function-forward, high-resolution screening under expedited timelines.

"We are proud to expand our existing partnership with the team at Prometheus Biosciences to help bring novel biologics to the autoimmune spaceThe Abveris antibody discovery platform, combined with the drug development capabilities of the Prometheus team, will provide promising therapeutics to patients around the world."


Tracey Mullen, Chief Executive Officer at Abveris

"Our team has been impressed by Abveris' exceptional level of scientific expertise and ability to discover and deliver antibodies with potential to translate into therapeutic candidates" said Olivier Laurent, Ph.D., Chief Technology Officer of Prometheus. "We look forward to continuing our partnership with Abveris to aid in our portfolio expansion with the common goal of bringing transformational therapies to patients."

About Prometheus Biosciences
Prometheus Biosciences, Inc. is a clinical-stage biotechnology company pioneering a precision medicine approach for the discovery, development, and commercialization of novel therapeutic and companion diagnostic products for the treatment of immune-mediated diseases, starting first with inflammatory bowel disease (IBD). The Company's precision medicine platform, Prometheus360, combines proprietary machine learning-based analytical approaches with one of the world's largest gastrointestinal bioinformatics databases to identify novel therapeutic targets and develop therapeutic candidates to engage those targets.

The Company's lead candidate, PRA023, is an IgG1 humanized monoclonal antibody (mAb) for the treatment of the two most common forms of IBD, Ulcerative Colitis (UC) and Crohn's Disease (CD). The Company has initiated enrollment in a Phase 2 trial in UC patients and a Phase 2a trial in CD patients, each utilizing a genetic-based companion diagnostic designed to identify patients more likely to respond to PRA023.

About Abveris
Abveris is Boston's premier antibody discovery company providing contract research services to the biopharma industry. Abveris applies advanced immunization methods combined with B cell screening and hybridoma-based antibody discovery technologies to provide comprehensive gene-to-antibody discovery services. Abveris is developing the next generation of biologics, cell therapies, vaccines, and diagnostics in partnership with global biopharma leaders. 

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Replimune and Incyte Enter into Clinical Trial Collaboration and Supply Agreement to Evaluate RP1 and INCB99280 in Patients

Businesswire | August 02, 2023

Replimune Group, Inc. a clinical stage biotechnology company pioneering the development of a novel portfolio of tumor-directed oncolytic immunotherapies, and Incyte a global biopharmaceutical company, today announced a clinical trial collaboration and supply agreement to study RP1, Replimune’s lead product candidate, in combination with INCB99280, Incyte’s small molecule oral PD-L1 inhibitor. “We are excited to enter into this collaboration with Incyte to explore the use of RP1 prior to surgery as we believe that our tumor-directed oncolytic immunotherapies could have a great impact in the neoadjuvant setting both in cutaneous squamous cell carcinoma (CSCC) and in other cancer types, given the high rates of complete responses we’ve seen to date, and data indicating RP1 is generally very well tolerated,” said Robert Coffin, Chief Research and Development Officer of Replimune. “The unique potential of the RPx platform to induce a patient-specific anti-tumor immune response with an off-the-shelf treatment speaks to the practicality and broad potential utility of the approach, and exploring its use with Incyte’s oral PD-L1 inhibitor has the potential to improve the patient experience further.” “We look forward to collaborating with Replimune on this study evaluating INCB99280 and RP1 in patients with CSCC. Our oral PD-L1 program has shown promising safety and efficacy in early studies thus far, and we look forward to adding to the growing body of evidence for INCB99280 and learning more about its potential to improve clinical outcomes,” said Lance Leopold, M.D., Group Vice President, Clinical Development Hematology and Oncology, Incyte. Under the terms of the agreement, Incyte will initiate and sponsor the clinical trial of INCB99280 and RP1 in patients with high risk, resectable cutaneous squamous cell carcinoma (CSCC), with the clinical trial expected to initiate in early 2024. Replimune will supply Incyte with RP1 for the study and share equally in the costs of the study. About RP1 RP1 is Replimune’s lead oncolytic immunotherapy product candidate and is based on a proprietary new strain of herpes simplex virus engineered for robust tumor selective replication and genetically armed with a fusogenic protein (GALV-GP R-) and GM-CSF, intended to maximize tumor killing potency, the immunogenicity of tumor cell death, and the activation of a systemic anti-tumor immune response. About INCB99280 INCB99280 is a potent and selective small molecule oral PD-L1 inhibitor, which has demonstrated promising clinical activity and safety in patients with solid tumors. INCB99280 is being evaluated in multiple Phase 2 studies as monotherapy and in combination with other antitumor agents. About Replimune Replimune Group, Inc.headquartered in Woburn, MA, was founded in 2015 with the mission to transform cancer treatment by pioneering the development of novel tumor-directed oncolytic immunotherapies. Replimune’s proprietary RPx platform is based on a potent HSV-1 backbone with payloads added to maximize immunogenic cell death and the induction of a systemic anti-tumor immune response. The RPx platform has a unique dual local and systemic mechanism of action (MOA) consisting of direct selective virus-mediated killing of the tumor resulting in the release of tumor derived antigens and altering of the tumor microenvironment (TME) to ignite a strong and durable systemic response. This MOA is expected to be synergistic with most established and experimental cancer treatment modalities, and, with an attractive safety profile the RPx platform has the versatility to be developed alone or combined with a variety of other treatment options. About Incyte Incyte is a Wilmington, Delaware-based, global biopharmaceutical company focused on finding solutions for serious unmet medical needs through the discovery, development and commercialization of proprietary therapeutics.

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Vaxxinity Demonstrates Target Engagement of Toxic Alpha-Synuclein in Parkinson’s Patients

Globenewswire | July 18, 2023

Vaxxinity, Inc. a U.S. company pioneering the development of a new class of medicines, announced new data from a Phase 1 clinical trial demonstrating that antibodies derived from its investigational immunotherapeutic for Parkinson’s disease (PD), UB-312, slows seeding of alpha-synuclein (aSyn) in cerebrospinal fluid (CSF) of patients with PD as demonstrated using multiple target engagement assays. These data signify that UB-312 has established clear target engagement in PD patient CSF, and provides further validation of Vaxxinity’s platform technology in neurodegenerative disease. “This is a major milestone for Vaxxinity in our quest to help Parkinson’s patients. Our candidate has shown target engagement of the toxic species of alpha-synuclein in patients, demonstrating not only proof of our technology platform, but also proof of the mechanism of our vaccine-derived antibodies specifically engaging with the toxic target in vivo,” said Mei Mei Hu, CEO of Vaxxinity. “Showing target engagement has always been a key challenge to overcome in neurodegeneration, and is of critical importance when demonstrated – a milestone worth celebrating. It is beyond our expectation to see this in our Phase 1 trial. We are endlessly grateful to the patients who participated, and to The Michael J. Fox Foundation and our collaborators for their work on these cutting-edge assays that supported this breakthrough.” UB-312 is designed to target aggregated forms of aSyn, the toxic species that underlies Parkinson’s disease and other synucleinopathies. Last month, Vaxxinity announced clinical data from Part B of its Phase 1 clinical trial of UB-312 demonstrating that UB-312 was well-tolerated and induced anti-aSyn antibody responses in participants with early PD, and that antibodies were detectable in the CSF. As part of this trial, The Michael J. Fox Foundation (MJFF) funded a 2-year collaborative project between Vaxxinity, the Mayo Clinic, and UTHealth Houston to analyze CSF collected from patients, and to conduct exploratory research to characterize the anti-aSyn antibodies produced after UB-312 administration and assess target engagement. Analyses from this and related research yielded insights about the pharmacodynamic effects of anti-aSyn antibodies generated by UB-312 in the Phase 1 trial. UB-312-derived antibodies show preferential binding to aggregated aSyn isolated from patients with PD and Multiple System Atrophy (MSA), as measured by dot blot. Preclinical data published in Alzheimer’s Research & Therapy in 2020 showed similar characteristics of UB-312-derived antibodies. UB-312-derived antibodies successfully demonstrate inhibition of aggregation of aSyn in both a seed amplification assay (SAA) and a protein misfolding cyclic amplification assay (PMCA). These techniques can potentially be used to identify people with PD, and also to measure the treatment response and pharmacodynamic properties of UB-312-derived antibodies from subjects in clinical trials. Importantly, aSyn aggregation was slowed down in CSF samples from PD patients who received UB-312, as compared to those who received placebo, in the Phase 1 trial. Vaxxinity plans to continue analyses of the clinical data as part of the collaborative project with MJFF, in addition to completing other target engagement assays and additional antibody characterization studies for binding kinetics and specificity. Mark Frasier, Ph.D., Chief Scientific Officer of MJFF, commented, “Integration of critical biomarker insight into therapeutic development programs is essential for building confidence in the treatment approach, and for designing informative trials. We’re pleased to support efforts of this kind that can have major impact for people with Parkinson’s disease.” About Parkinson’s Disease Parkinson’s disease (PD) affects approximately one million people in the United States and more than 10 million people worldwide. PD is a chronic and progressive neurodegenerative disorder that affects predominately dopamine-producing (“dopaminergic”) neurons in the substantia nigra area of the brain. While today’s approved products are aimed at providing symptomatic relief, they often produce significant side effects and lose their beneficial effects over time. There are no currently approved disease-modifying therapeutics for PD. Alpha-synuclein (aSyn) is a protein highly expressed in neurons, mostly at presynaptic terminals, suggesting a role in synaptic vesicle trafficking, synaptic functions and in regulation of neurotransmitter release at the synapse. Mutations in the gene encoding aSyn are known to cause or increase the risk of developing PD or dementia with Lewy bodies (DLB) and have been shown to alter the secondary structure of aSyn, resulting in misfolded and aggregated forms of the protein (i.e., pathological forms). While mutations in the aSyn gene are rare, aggregates of aSyn in the form of Lewy bodies (LB) and Lewy neurites are common neuropathological hallmarks of both familial and sporadic PD, suggesting a key role of aSyn in PD neuropathogenesis. Immunotherapy approaches targeting aSyn have been shown to ameliorate aSyn pathology as well as functional deficits in mouse models of PD and are now being investigated in the clinic. About UB-312 UB-312 is a vaccine candidate targeting pathological forms of alpha-synuclein (aSyn) for the disease-modifying treatment and prevention of Parkinson’s disease (PD) and other synucleinopathies. Preclinical data indicated that UB-312 elicits antibodies that preferentially recognize pathological forms of aSyn, and improve motor performance in mouse models of synucleinopathies. Clinical data from the Phase 1 trial indicate that UB-312 elicits antibodies that target aggregated aSyn, and that these antibodies slow the aggregation of alpha-synuclein in the cerebrospinal fluid of patients with PD. The European Medical Agency has granted UB-312 orphan designation for multiple system atrophy. About Vaxxinity Vaxxinity, Inc. is a purpose-driven biotechnology company committed to democratizing healthcare across the globe. The company is pioneering a new class of medicines aimed at disrupting the existing treatment paradigm for chronic disease, increasingly dominated by monoclonal antibodies, which suffer from prohibitive costs and cumbersome administration. The company’s proprietary technology platform has enabled the innovation of novel synthetic peptide immunotherapy candidates designed to bring the efficiency of vaccines to the treatment of chronic diseases, including Alzheimer’s disease, Parkinson’s disease, migraine, and hypercholesterolemia. The technology is also implemented as part of a COVID-19 vaccine program. Vaxxinity has optimized its pipeline to achieve a potentially historic, global impact on human health.

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Graf Acquisition Corp. IV and NKGen Biotech, Inc. Announce Effectiveness of Form S-4 for Proposed Business Combination

Globenewswire | August 16, 2023

Graf Acquisition Corp. IV and NKGen Biotech, Inc. on August 14, 2023 announced that Graf’s registration statement on Form S-4 relating to the previously announced business combination (the “Business Combination”) with NKGen, has been declared effective by the U.S. Securities and Exchange Commission (the “SEC”). Graf also commenced mailing the definitive proxy statement/prospectus on August 14, 2023, which was included in the Registration Statement, relating to the special meeting of its stockholders to be held in connection with the Business Combination (the “Special Meeting”) to stockholders of record as of the close of business on August 7, 2023 (the “Record Date”). The Special Meeting will be held virtually at 10:00 a.m., New York City time, on August 30, 2023 at https://www.cstproxy.com/grafiv/​sm2023. Graf’s stockholders of record as of the Record Date are entitled to vote at the Special Meeting. In connection with the Special Meeting, Graf’s stockholders who wish to exercise their redemption rights must do so no later than 5:00 p.m., New York City time, on August 28, 2023 by following the procedures specified in the definitive proxy statement/prospectus for the Special Meeting. In addition, Graf announced on August 14, 2023 that it intends to voluntarily transfer the listing of its shares of common stock and public warrants to The Nasdaq Stock Market LLC (“Nasdaq”) from the New York Stock Exchange (the “NYSE”) following the completion of the Business Combination. In connection with the closing of the Business Combination, Graf will change its name to “NKGen Biotech, Inc.” and NKGen will change its name to “NKGen Operating Biotech, Inc.” The common stock and public warrants of the post-combination company are expected to commence trading on Nasdaq the day after the closing of the Business Combination under the symbols “NKGN” and “NKGNW,” respectively. Graf’s units, common stock and public warrants will continue to trade on the NYSE until the transfer is complete. The decision to list on Nasdaq was made in consideration of the Business Combination and enables the post-combination company to be listed alongside the other innovative biotechnology companies that are also listed on Nasdaq. At the closing of the Business Combination, Graf will delist its units, shares of common stock and public warrants from the NYSE. The Nasdaq listing and NYSE delisting are subject to the closing of the Business Combination and fulfillment of all Nasdaq listing requirements and NYSE delisting procedures. About Graf Acquisition Corp. IV Graf is a blank-check company incorporated as a Delaware corporation and formed for the purpose of effecting a merger, capital stock exchange, asset acquisition, stock purchase, reorganization, or similar business combination with one or more businesses. About NKGen Biotech, Inc. NKGen is a clinical-stage biotechnology company focused on the development and commercialization of innovative autologous, allogeneic, and CAR-NK natural killer cell therapies. NKGen is headquartered in Santa Ana, California, USA.

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Replimune and Incyte Enter into Clinical Trial Collaboration and Supply Agreement to Evaluate RP1 and INCB99280 in Patients

Businesswire | August 02, 2023

Replimune Group, Inc. a clinical stage biotechnology company pioneering the development of a novel portfolio of tumor-directed oncolytic immunotherapies, and Incyte a global biopharmaceutical company, today announced a clinical trial collaboration and supply agreement to study RP1, Replimune’s lead product candidate, in combination with INCB99280, Incyte’s small molecule oral PD-L1 inhibitor. “We are excited to enter into this collaboration with Incyte to explore the use of RP1 prior to surgery as we believe that our tumor-directed oncolytic immunotherapies could have a great impact in the neoadjuvant setting both in cutaneous squamous cell carcinoma (CSCC) and in other cancer types, given the high rates of complete responses we’ve seen to date, and data indicating RP1 is generally very well tolerated,” said Robert Coffin, Chief Research and Development Officer of Replimune. “The unique potential of the RPx platform to induce a patient-specific anti-tumor immune response with an off-the-shelf treatment speaks to the practicality and broad potential utility of the approach, and exploring its use with Incyte’s oral PD-L1 inhibitor has the potential to improve the patient experience further.” “We look forward to collaborating with Replimune on this study evaluating INCB99280 and RP1 in patients with CSCC. Our oral PD-L1 program has shown promising safety and efficacy in early studies thus far, and we look forward to adding to the growing body of evidence for INCB99280 and learning more about its potential to improve clinical outcomes,” said Lance Leopold, M.D., Group Vice President, Clinical Development Hematology and Oncology, Incyte. Under the terms of the agreement, Incyte will initiate and sponsor the clinical trial of INCB99280 and RP1 in patients with high risk, resectable cutaneous squamous cell carcinoma (CSCC), with the clinical trial expected to initiate in early 2024. Replimune will supply Incyte with RP1 for the study and share equally in the costs of the study. About RP1 RP1 is Replimune’s lead oncolytic immunotherapy product candidate and is based on a proprietary new strain of herpes simplex virus engineered for robust tumor selective replication and genetically armed with a fusogenic protein (GALV-GP R-) and GM-CSF, intended to maximize tumor killing potency, the immunogenicity of tumor cell death, and the activation of a systemic anti-tumor immune response. About INCB99280 INCB99280 is a potent and selective small molecule oral PD-L1 inhibitor, which has demonstrated promising clinical activity and safety in patients with solid tumors. INCB99280 is being evaluated in multiple Phase 2 studies as monotherapy and in combination with other antitumor agents. About Replimune Replimune Group, Inc.headquartered in Woburn, MA, was founded in 2015 with the mission to transform cancer treatment by pioneering the development of novel tumor-directed oncolytic immunotherapies. Replimune’s proprietary RPx platform is based on a potent HSV-1 backbone with payloads added to maximize immunogenic cell death and the induction of a systemic anti-tumor immune response. The RPx platform has a unique dual local and systemic mechanism of action (MOA) consisting of direct selective virus-mediated killing of the tumor resulting in the release of tumor derived antigens and altering of the tumor microenvironment (TME) to ignite a strong and durable systemic response. This MOA is expected to be synergistic with most established and experimental cancer treatment modalities, and, with an attractive safety profile the RPx platform has the versatility to be developed alone or combined with a variety of other treatment options. About Incyte Incyte is a Wilmington, Delaware-based, global biopharmaceutical company focused on finding solutions for serious unmet medical needs through the discovery, development and commercialization of proprietary therapeutics.

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Vaxxinity Demonstrates Target Engagement of Toxic Alpha-Synuclein in Parkinson’s Patients

Globenewswire | July 18, 2023

Vaxxinity, Inc. a U.S. company pioneering the development of a new class of medicines, announced new data from a Phase 1 clinical trial demonstrating that antibodies derived from its investigational immunotherapeutic for Parkinson’s disease (PD), UB-312, slows seeding of alpha-synuclein (aSyn) in cerebrospinal fluid (CSF) of patients with PD as demonstrated using multiple target engagement assays. These data signify that UB-312 has established clear target engagement in PD patient CSF, and provides further validation of Vaxxinity’s platform technology in neurodegenerative disease. “This is a major milestone for Vaxxinity in our quest to help Parkinson’s patients. Our candidate has shown target engagement of the toxic species of alpha-synuclein in patients, demonstrating not only proof of our technology platform, but also proof of the mechanism of our vaccine-derived antibodies specifically engaging with the toxic target in vivo,” said Mei Mei Hu, CEO of Vaxxinity. “Showing target engagement has always been a key challenge to overcome in neurodegeneration, and is of critical importance when demonstrated – a milestone worth celebrating. It is beyond our expectation to see this in our Phase 1 trial. We are endlessly grateful to the patients who participated, and to The Michael J. Fox Foundation and our collaborators for their work on these cutting-edge assays that supported this breakthrough.” UB-312 is designed to target aggregated forms of aSyn, the toxic species that underlies Parkinson’s disease and other synucleinopathies. Last month, Vaxxinity announced clinical data from Part B of its Phase 1 clinical trial of UB-312 demonstrating that UB-312 was well-tolerated and induced anti-aSyn antibody responses in participants with early PD, and that antibodies were detectable in the CSF. As part of this trial, The Michael J. Fox Foundation (MJFF) funded a 2-year collaborative project between Vaxxinity, the Mayo Clinic, and UTHealth Houston to analyze CSF collected from patients, and to conduct exploratory research to characterize the anti-aSyn antibodies produced after UB-312 administration and assess target engagement. Analyses from this and related research yielded insights about the pharmacodynamic effects of anti-aSyn antibodies generated by UB-312 in the Phase 1 trial. UB-312-derived antibodies show preferential binding to aggregated aSyn isolated from patients with PD and Multiple System Atrophy (MSA), as measured by dot blot. Preclinical data published in Alzheimer’s Research & Therapy in 2020 showed similar characteristics of UB-312-derived antibodies. UB-312-derived antibodies successfully demonstrate inhibition of aggregation of aSyn in both a seed amplification assay (SAA) and a protein misfolding cyclic amplification assay (PMCA). These techniques can potentially be used to identify people with PD, and also to measure the treatment response and pharmacodynamic properties of UB-312-derived antibodies from subjects in clinical trials. Importantly, aSyn aggregation was slowed down in CSF samples from PD patients who received UB-312, as compared to those who received placebo, in the Phase 1 trial. Vaxxinity plans to continue analyses of the clinical data as part of the collaborative project with MJFF, in addition to completing other target engagement assays and additional antibody characterization studies for binding kinetics and specificity. Mark Frasier, Ph.D., Chief Scientific Officer of MJFF, commented, “Integration of critical biomarker insight into therapeutic development programs is essential for building confidence in the treatment approach, and for designing informative trials. We’re pleased to support efforts of this kind that can have major impact for people with Parkinson’s disease.” About Parkinson’s Disease Parkinson’s disease (PD) affects approximately one million people in the United States and more than 10 million people worldwide. PD is a chronic and progressive neurodegenerative disorder that affects predominately dopamine-producing (“dopaminergic”) neurons in the substantia nigra area of the brain. While today’s approved products are aimed at providing symptomatic relief, they often produce significant side effects and lose their beneficial effects over time. There are no currently approved disease-modifying therapeutics for PD. Alpha-synuclein (aSyn) is a protein highly expressed in neurons, mostly at presynaptic terminals, suggesting a role in synaptic vesicle trafficking, synaptic functions and in regulation of neurotransmitter release at the synapse. Mutations in the gene encoding aSyn are known to cause or increase the risk of developing PD or dementia with Lewy bodies (DLB) and have been shown to alter the secondary structure of aSyn, resulting in misfolded and aggregated forms of the protein (i.e., pathological forms). While mutations in the aSyn gene are rare, aggregates of aSyn in the form of Lewy bodies (LB) and Lewy neurites are common neuropathological hallmarks of both familial and sporadic PD, suggesting a key role of aSyn in PD neuropathogenesis. Immunotherapy approaches targeting aSyn have been shown to ameliorate aSyn pathology as well as functional deficits in mouse models of PD and are now being investigated in the clinic. About UB-312 UB-312 is a vaccine candidate targeting pathological forms of alpha-synuclein (aSyn) for the disease-modifying treatment and prevention of Parkinson’s disease (PD) and other synucleinopathies. Preclinical data indicated that UB-312 elicits antibodies that preferentially recognize pathological forms of aSyn, and improve motor performance in mouse models of synucleinopathies. Clinical data from the Phase 1 trial indicate that UB-312 elicits antibodies that target aggregated aSyn, and that these antibodies slow the aggregation of alpha-synuclein in the cerebrospinal fluid of patients with PD. The European Medical Agency has granted UB-312 orphan designation for multiple system atrophy. About Vaxxinity Vaxxinity, Inc. is a purpose-driven biotechnology company committed to democratizing healthcare across the globe. The company is pioneering a new class of medicines aimed at disrupting the existing treatment paradigm for chronic disease, increasingly dominated by monoclonal antibodies, which suffer from prohibitive costs and cumbersome administration. The company’s proprietary technology platform has enabled the innovation of novel synthetic peptide immunotherapy candidates designed to bring the efficiency of vaccines to the treatment of chronic diseases, including Alzheimer’s disease, Parkinson’s disease, migraine, and hypercholesterolemia. The technology is also implemented as part of a COVID-19 vaccine program. Vaxxinity has optimized its pipeline to achieve a potentially historic, global impact on human health.

Read More

Medical, Industry Outlook

Graf Acquisition Corp. IV and NKGen Biotech, Inc. Announce Effectiveness of Form S-4 for Proposed Business Combination

Globenewswire | August 16, 2023

Graf Acquisition Corp. IV and NKGen Biotech, Inc. on August 14, 2023 announced that Graf’s registration statement on Form S-4 relating to the previously announced business combination (the “Business Combination”) with NKGen, has been declared effective by the U.S. Securities and Exchange Commission (the “SEC”). Graf also commenced mailing the definitive proxy statement/prospectus on August 14, 2023, which was included in the Registration Statement, relating to the special meeting of its stockholders to be held in connection with the Business Combination (the “Special Meeting”) to stockholders of record as of the close of business on August 7, 2023 (the “Record Date”). The Special Meeting will be held virtually at 10:00 a.m., New York City time, on August 30, 2023 at https://www.cstproxy.com/grafiv/​sm2023. Graf’s stockholders of record as of the Record Date are entitled to vote at the Special Meeting. In connection with the Special Meeting, Graf’s stockholders who wish to exercise their redemption rights must do so no later than 5:00 p.m., New York City time, on August 28, 2023 by following the procedures specified in the definitive proxy statement/prospectus for the Special Meeting. In addition, Graf announced on August 14, 2023 that it intends to voluntarily transfer the listing of its shares of common stock and public warrants to The Nasdaq Stock Market LLC (“Nasdaq”) from the New York Stock Exchange (the “NYSE”) following the completion of the Business Combination. In connection with the closing of the Business Combination, Graf will change its name to “NKGen Biotech, Inc.” and NKGen will change its name to “NKGen Operating Biotech, Inc.” The common stock and public warrants of the post-combination company are expected to commence trading on Nasdaq the day after the closing of the Business Combination under the symbols “NKGN” and “NKGNW,” respectively. Graf’s units, common stock and public warrants will continue to trade on the NYSE until the transfer is complete. The decision to list on Nasdaq was made in consideration of the Business Combination and enables the post-combination company to be listed alongside the other innovative biotechnology companies that are also listed on Nasdaq. At the closing of the Business Combination, Graf will delist its units, shares of common stock and public warrants from the NYSE. The Nasdaq listing and NYSE delisting are subject to the closing of the Business Combination and fulfillment of all Nasdaq listing requirements and NYSE delisting procedures. About Graf Acquisition Corp. IV Graf is a blank-check company incorporated as a Delaware corporation and formed for the purpose of effecting a merger, capital stock exchange, asset acquisition, stock purchase, reorganization, or similar business combination with one or more businesses. About NKGen Biotech, Inc. NKGen is a clinical-stage biotechnology company focused on the development and commercialization of innovative autologous, allogeneic, and CAR-NK natural killer cell therapies. NKGen is headquartered in Santa Ana, California, USA.

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