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Last update 08 May 2025

STAT3

Last update 08 May 2025

Basic Info

Synonyms

Acute-phase response factor, APRF, Signal transducer and activator of transcription 3

+ [3]

Introduction

Signal transducer and transcription activator that mediates cellular responses to interleukins, KITLG/SCF, LEP and other growth factors (PubMed:10688651, PubMed:12359225, PubMed:12873986, PubMed:15194700, PubMed:15653507, PubMed:16285960, PubMed:17344214, PubMed:18242580, PubMed:18782771, PubMed:22306293, PubMed:23084476, PubMed:28262505, PubMed:32929201, PubMed:38404237). Once activated, recruits coactivators, such as NCOA1 or MED1, to the promoter region of the target gene (PubMed:15653507, PubMed:16285960, PubMed:17344214, PubMed:18782771, PubMed:28262505, PubMed:32929201). May mediate cellular responses to activated FGFR1, FGFR2, FGFR3 and FGFR4 (PubMed:12873986). Upon activation of IL6ST/gp130 signaling by interleukin-6 (IL6), binds to the IL6-responsive elements identified in the promoters of various acute-phase protein genes (PubMed:12359225). Activated by IL31 through IL31RA (PubMed:15194700). Acts as a regulator of inflammatory response by regulating differentiation of naive CD4(+) T-cells into T-helper Th17 or regulatory T-cells (Treg): acetylation promotes its transcription activity and cell differentiation while deacetylation and oxidation of lysine residues by LOXL3 inhibits differentiation (PubMed:28065600, PubMed:28262505). Involved in cell cycle regulation by inducing the expression of key genes for the progression from G1 to S phase, such as CCND1 (PubMed:17344214). Mediates the effects of LEP on melanocortin production, body energy homeostasis and lactation (By similarity). May play an apoptotic role by transctivating BIRC5 expression under LEP activation (PubMed:18242580). Cytoplasmic STAT3 represses macroautophagy by inhibiting EIF2AK2/PKR activity (PubMed:23084476). Plays a crucial role in basal beta cell functions, such as regulation of insulin secretion (By similarity). Following JAK/STAT signaling activation and as part of a complex with NFATC3 and NFATC4, binds to the alpha-beta E4 promoter region of CRYAB and activates transcription in cardiomyocytes (By similarity).

204

Drugs associated with STAT3

Napabucasin

Target

NQO1 x STAT3

Mechanism

NQO1 inhibitors [+1]

Active Org.

Pharmaceutics International, Inc. [+5]

Originator Org.

Pharmaceutics International, Inc.

Active Indication

Metastatic Pancreatic Cancer [+7]

Inactive Indication

Acute Myeloid Leukemia [+17]

Drug Highest PhasePhase 3

First Approval Ctry. / Loc.-

First Approval Date20 Jan 1800

Danvatirsen

Target

STAT3

Mechanism

STAT3 inhibitors

Active Org.

AstraZeneca PLC [+2]

Originator Org.

Ionis Pharmaceuticals, Inc.

Active Indication

Recurrent Squamous Cell Carcinoma of the Head and Neck [+15]

Inactive Indication

Advanced cancer [+4]

Drug Highest PhasePhase 2

First Approval Ctry. / Loc.-

First Approval Date20 Jan 1800

AB 001 (Agastiya Biotech)

Target

PDL1 x STAT3

Mechanism

PDL1 inhibitors [+1]

Active Org.

Agastiya Biotech LLC

Originator Org.

Agastiya Biotech LLC

Active Indication

Neoplasms

Inactive Indication-

Drug Highest PhasePhase 2

First Approval Ctry. / Loc.-

First Approval Date20 Jan 1800

151

Clinical Trials associated with STAT3

NCT05668949

/ Not yet recruitingPhase 1/2IIT

Phase I/II Open Label Study Evaluating the Safety and Efficacy of Combining STAT3 Inhibition (TTI-101) With Anti-PD-1 Therapy (Pembrolizumab) in Patients With Recurrent or Metastatic (RM) Head and Neck Squamous Cell Carcinoma (HNSCC)

To review safety and efficacy of TTI-101 plus Pembrolizumab in patients the Recurrent and Metastatic head and Neck Squamous Cell Carcinoma.

Start Date31 Dec 2025

Sponsor / Collaborator

The University of Texas MD Anderson Cancer Center

[+1]

NCT06919666

/ Not yet recruitingPhase 1/2IIT

Phase Ib/II Study of NT219 in Combination With Pembrolizumab or Cetuximab in Patients With Recurrent or Metastatic Head and Neck Squamous Cell Carcinoma (HNSCC)

Fixed dose NT219 weekly plus pembrolizumab every 3 weeks or cetuximab weekly to be continued until progression, unacceptable toxicity, or investigator or participant decision.

Start Date01 Jun 2025

Sponsor / Collaborator

University of Colorado Denver

[+1]

NCT05660408

/ RecruitingPhase 1/2IIT

RNA PRIME - RNA Lipid Particles Targeting Pediatric Recurrent Intracranial Malignancies and Other systEmic Solid Tumors

The Investigators have demonstrated in preclinical studies that RNA liposomes activate APCs, induce antigen-specific T cell immunity, and can supplant DCs in a cell therapy model for HGG and have shown feasibility and activity of this approach in preclinical models and in canine patients with a spontaneous malignant glioma. In one arm of this study, we will investigate the safety and immunologic activity of RNA-LP vaccines in pediatric patients with recurrent pHGG.
The investigators have also shown that intravenous administration of tumor mRNA loaded lipid particles (LPs) localizes primarily to lung, transfect antigen presenting cells (APCs) and lead to an activated T cell response for induction of anti-tumor immunity. In contrast to other formulations, RNA-LPs recruit multiple arms of the immune system (i.e. innate/adaptive), and remodel the systemic/intratumoral immune milieu, which remain potent barriers for vaccine, cellular, and checkpoint inhibiting immunotherapies. After only a single RNA-LP vaccine, the bulk of systemic and intratumoral dendritic cells (DCs) in mice display an activated phenotype; these activated DCs (harvested from tumors) expand antigen specific T cell immunity. In immunologically resistant pulmonary osteosacroma murine tumor models (i.e. K7M2), RNA-LPs induce robust anti-tumor efficacy in settings where immune checkpoint inhibitors (i.e. anti-PD-L1 therapy) do not confer therapeutic benefit. The investigators have already demonstrated safety of RNA-LPs in acute/chronic murine toxicity studies, and in client-owned canine trial.
In this study, we will investigate the manufacturing feasibility, safety and immunologic activity of RNA-LP vaccine in patients with recurrent pulmonary or unresectable osteosarcoma and recurrent pHGG.

Start Date12 Mar 2025

Sponsor / Collaborator

University of Florida

[+4]

100 Clinical Results associated with STAT3

100 Translational Medicine associated with STAT3

0 Patents (Medical) associated with STAT3

36,446

Literatures (Medical) associated with STAT3

01 Jan 2026·Neural Regeneration Research

Changes in border-associated macrophages after stroke: Single-cell sequencing analysis

Article

Author: Zhang, Fuqiang ; Yu, Ning ; Wang, Shilei ; Wang, Peng ; Wen, Cuili ; Zhao, Yang

JOURNAL/nrgr/04.03/01300535-202601000-00038/figure1/v/2025-03-30T110608Z/r/image-tiff Border-associated macrophages are located at the interface between the brain and the periphery, including the perivascular spaces, choroid plexus, and meninges. Until recently, the functions of border-associated macrophages have been poorly understood and largely overlooked. However, a recent study reported that border-associated macrophages participate in stroke-induced inflammation, although many details and the underlying mechanisms remain unclear. In this study, we performed a comprehensive single-cell analysis of mouse border-associated macrophages using sequencing data obtained from the Gene Expression Omnibus (GEO) database (GSE174574 and GSE225948). Differentially expressed genes were identified, and enrichment analysis was performed to identify the transcription profile of border-associated macrophages. CellChat analysis was conducted to determine the cell communication network of border-associated macrophages. Transcription factors were predicted using the ‘pySCENIC’ tool. We found that, in response to hypoxia, border-associated macrophages underwent dynamic transcriptional changes and participated in the regulation of inflammatory-related pathways. Notably, the tumor necrosis factor pathway was activated by border-associated macrophages following ischemic stroke. The pySCENIC analysis indicated that the activity of signal transducer and activator of transcription 3 (Stat3) was obviously upregulated in stroke, suggesting that Stat3 inhibition may be a promising strategy for treating border-associated macrophages-induced neuroinflammation. Finally, we constructed an animal model to investigate the effects of border-associated macrophages depletion following a stroke. Treatment with liposomes containing clodronate significantly reduced infarct volume in the animals and improved neurological scores compared with untreated animals. Taken together, our results demonstrate comprehensive changes in border-associated macrophages following a stroke, providing a theoretical basis for targeting border-associated macrophages-induced neuroinflammation in stroke treatment.

31 Dec 2025·Renal Failure

Dihydromyricetin protects against cisplatin-induced renal injury and mitochondria-mediated apoptosis via the EGFR/HSP27/STAT3 signaling pathway

Article

Author: Liu, Zhengye ; Ye, Weifeng ; Zhang, Gensheng ; Zhu, Runzhi ; Xu, Zheming ; Tao, Chang ; Chen, Zhenjie ; Lv, Zhisu ; Zhu, Bin ; Yan, Xiang ; Han, Huirong ; Gong, Jianguang ; Liu, Yang ; Zhang, Minjing ; Zhang, Xue ; Zhou, Suhan

BACKGROUNDCisplatin (CP) has been used as an effective chemotherapy drug for different types of cancers. Despite its therapeutic benefits, the clinical utility of CP is often hindered by adverse effects, notably acute kidney injury (AKI), which restricts its widespread application. Dihydromyricetin (DHM) is a flavonoid acquired from Ampelopsis grossedentata, exhibiting a range of pharmacological activities. The major objective of this research was to examine the possible molecular mechanism involved in CP-induced AKI and the protective function of DHM.METHODSIn this study, the protective function of DHM against CP-induced AKI was assessed in both mice and HK-2 cells. Kidney dysfunction parameters and renal morphology were evaluated to ascertain the extent of protection. Additionally, proteomics techniques were employed to investigate the protective effect of DHM and elucidate the underlying molecular mechanisms involved in mitigating CP-induced AKI. In addition, protein levels of epidermal growth factor receptor (EGFR), p-EGFR, heat shock protein 27 (HSP27), p-HSP27, STAT3, and p-STAT3 in renal tissues were investigated. Furthermore, an EGFR-blocking agent (gefitinib) or si-RNA of HSP27 was used to study the effects of inhibiting EGFR or HSP27 on CP-induced renal injury.RESULTSDHM decreased blood urea nitrogen (BUN) and creatinine in serum, alleviated renal morphological injury and downregulated the expression of CP-induced kidney injury molecule-1 and neutrophil gelatinase-related lipocalin. Proteomic data revealed HSP27 as a potential therapeutic target for AKI. DHM treatment resulted in the downregulation of EGFR, HSP27, and STAT3 phosphorylation, ultimately mitigating CP-induced AKI. In addition, the inhibition of EGFR or HSP27 reduced mitochondria-mediated apoptosis and CP-induced cell damage in HK-2 cells.CONCLUSIONSDHM effectively inhibited CP-induced oxidative stress, inflammation, and mitochondria-mediated apoptosis through the EGFR/HSP27/STAT3 pathway.

31 Dec 2025·Gut Microbes

Fusobacterium nucleatum exacerbates colitis via STAT3 activation induced by Acetyl-CoA accumulation

Article

Author: Zhang, Jixiang ; Dong, Weiguo ; Yu, Baoping ; Li, Xiangyun ; He, Haodong ; Deng, Beiying ; Wu, Xiaohan ; Tan, Cheng ; Xiang, Zixuan ; Xu, Miao ; Wang, Xiaoli ; Liu, Yafei

Fusobacterium nucleatum (F. nucleatum) has emerged as a potential contributor to ulcerative colitis (UC) pathogenesis, although the specific mechanisms remain incompletely understood. This study demonstrates that F. nucleatum promotes colitis by disrupting intestinal barrier integrity, inducing apoptosis in epithelial cells, and modulating inflammatory pathways. Furthermore, we demonstrate that F. nucleatum promotes STAT3 acetylation at K685, followed by phosphorylation at Y705, thereby enhancing its transcriptional activity and exacerbating colitis severity. Additionally, F. nucleatum-mediated upregulation of acetyl-CoA levels is responsible for STAT3 acetylation, linking metabolic processes to UC pathophysiology. Pharmacological inhibition of acetyl-CoA production effectively mitigates F. nucleatum-induced colitis in experimental models, suggesting potential therapeutic strategies targeting these pathways. These findings unveil a novel regulatory pathway in F. nucleatum-associated UC progression and offer new insights for future UC prevention and treatment.

313

News (Medical) associated with STAT3

29 Apr 2025

·www.globenewswire.com

Moleculin Announces New Pre-Clinical Data for Annamycin Demonstrating Market Expansion Potential Including Treatment for Pancreatic Cancer

Data presented at the American Association for Cancer Research (AACR) Annual Meeting 2025Annamycin is potentially a highly versatile drug capable of working synergistically with numerous mechanistically different FDA approved anticancer first line therapies both in vitro and in vivo HOUSTON, April 29, 2025 (GLOBE NEWSWIRE) -- Moleculin Biotech, Inc., (Nasdaq: MBRX) (“Moleculin” or the “Company”), a late-stage pharmaceutical company with a broad portfolio of drug candidates targeting hard-to-treat cancers and viral infections, today announced that an abstract and poster presentation regarding the Company’s next-generation anthracycline, Annamycin, was presented at the American Association for Cancer Research (AACR) Annual Meeting 2025, on April 28, 2025, at the McCormick Place Convention Center in Chicago, IL. “The case for expanding the potential markets for Annamycin continues to get stronger,” said Walter Klemp, Chairman and CEO of Moleculin. “In an environment where more and more cancer treatment regimens are combinations of two or more drugs, it is encouraging to see that Annamycin appears capable of generating synergistic results with so many commonly used drugs. The latest research continues to support our view that, in addition to hematological malignancies, solid cancers including sarcoma and pancreatic cancer also represent important expansion opportunities for Annamycin. These findings may help expand the clinical use of Annamycin and consequently make our drug candidate even more attractive to prospective future partners. With five previous or current investigator-initiated clinical trials supporting development of our drug candidates, we believe that our next investigator-initiated trials could be Annamycin for the treatment of pancreatic cancer or advance soft tissue sarcomas.” The study, presented in poster form, was designed to assess the efficacy of Annamycin in combination with approved anticancer agents in order to identify novel potentially highly efficacious clinical applications of Annamycin alone and with a therapeutic partner. Annamycin in its non-liposomal form (free drug; in vitro) and Liposomal Annamycin (L-ANN; in vivo) were tested in combination with selected US Food and Drug Administration (FDA) approved drugs. Usually, the most efficacious drug combinations from the in vitro studies were then tested using well developed in vivo models of leukemia and solid tumors, including sarcoma and pancreatic cancer. It should be noted that in a separate set of previous experiments, Annamycin activity was tested in vitro, and appeared to be highly active, against drug resistant cell lines, including cells resistant to cytarabine and venetoclax. The research shown in the AACR poster, described below, demonstrates that Annamycin is potentially a highly versatile drug capable of working synergistically with numerous mechanistically different FDA approved anticancer agents both in vitro and in vivo. Ongoing studies are working towards identifying new efficacious clinical applications of L-ANN drug combinations with the long-term goal of developing novel therapeutic strategies for treatment resistant cancers. Details of the poster presentation are as follows: Title: Combining Annamycin, a Non-cardiotoxic Potent Topo II Poison, with Azacitidine, Cytarabine, Gemcitabine, Ifosfamide, Trabectedin, or Vincristine to Synergize Anticancer Effects and Identify Potential Clinical ApplicationsTrack: Experimental and Molecular TherapeuticsSession: PO.ET02.03. Drug Combination Strategies for Cancer TreatmentAbstract Number: 1683/ 14Presenter: Waldemar Priebe, Ph.D., Department of Experimental Therapeutics, Division of Cancer Medicine, The University of Texas MD Anderson Cancer CenterFor more information, visit the AACR Annual Meeting website. About Moleculin Biotech, Inc. Moleculin Biotech, Inc. is a Phase 3 clinical stage pharmaceutical company advancing a pipeline of therapeutic candidates addressing hard-to-treat tumors and viruses. The Company’s lead program, Annamycin, is a next-generation highly efficacious and well tolerated anthracycline designed to avoid multidrug resistance mechanisms and to eliminate the cardiotoxicity common with currently prescribed anthracyclines. Annamycin is currently in development for the treatment of relapsed or refractory acute myeloid leukemia (AML) and soft tissue sarcoma (STS) lung metastases.The Company is initiating the MIRACLE (Moleculin R/R AML AnnAraC Clinical Evaluation) Trial (MB-108), a pivotal, adaptive design Phase 3 trial evaluating Annamycin in combination with cytarabine, together referred to as AnnAraC, for the treatment of relapsed or refractory acute myeloid leukemia. Following a successful Phase 1B/2 study (MB-106), with input from the FDA, the Company believes it has substantially de-risked the development pathway towards a potential approval for Annamycin for the treatment of AML. This study is subject to appropriate future filings with potential additional feedback from the FDA and their foreign equivalents.Additionally, the Company is developing WP1066, an Immune/Transcription Modulator capable of inhibiting p-STAT3 and other oncogenic transcription factors while also stimulating a natural immune response, targeting brain tumors, pancreatic and other cancers. Moleculin is also engaged in the development of a portfolio of antimetabolites, including WP1122 for the potential treatment of pathogenic viruses, as well as certain cancer indications. For more information about the Company, please visit www.moleculin.com and connect on X, LinkedIn and Facebook. Forward-Looking StatementsSome of the statements in this release are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, Section 21E of the Securities Exchange Act of 1934 and the Private Securities Litigation Reform Act of 1995, which involve risks and uncertainties. Forward-looking statements in this press release include, without limitation, the ability of Annamycin to demonstrate in clinical trials the results from the animal models described in the poster. Moleculin will require significant additional financing, for which the Company has no commitments, in order to conduct its clinical trials as described in this press release, and the milestones described in this press release assume the Company’s ability to secure such financing on a timely basis. Although Moleculin believes that the expectations reflected in such forward-looking statements are reasonable as of the date made, expectations may prove to have been materially different from the results expressed or implied by such forward-looking statements. Moleculin has attempted to identify forward-looking statements by terminology including ‘believes,’ ‘estimates,’ ‘anticipates,’ ‘expects,’ ‘plans,’ ‘projects,’ ‘intends,’ ‘potential,’ ‘may,’ ‘could,’ ‘might,’ ‘will,’ ‘should,’ ‘approximately’ or other words that convey uncertainty of future events or outcomes to identify these forward-looking statements. These statements are only predictions and involve known and unknown risks, uncertainties, and other factors, including those discussed under Item 1A. “Risk Factors” in our most recently filed Form 10-K filed with the Securities and Exchange Commission (SEC) and updated from time to time in our Form 10-Q filings and in our other public filings with the SEC. Any forward-looking statements contained in this release speak only as of its date. We undertake no obligation to update any forward-looking statements contained in this release to reflect events or circumstances occurring after its date or to reflect the occurrence of unanticipated events. Investor Contact:JTC Team, LLCJenene Thomas(908) 824-0775MBRX@jtcir.com

Phase 3AACR

17 Apr 2025

·www.globenewswire.com

Moleculin Announces Acceptance of Abstract to be Presented at the American Association for Cancer Research (AACR) Annual Meeting 2025

HOUSTON, April 17, 2025 (GLOBE NEWSWIRE) -- Moleculin Biotech, Inc., (Nasdaq: MBRX) (“Moleculin” or the “Company”), a late-stage pharmaceutical company with a broad portfolio of drug candidates targeting hard-to-treat cancers and viruses, today announced that an abstract regarding the Company’s next-generation anthracycline, Annamycin, has been selected for poster presentation at the American Association for Cancer Research (AACR) Annual Meeting 2025, taking place April 25-30, 2025, at the McCormick Place Convention Center in Chicago, IL. Details of the presentation are as follows: Title: Combining Annamycin, a Non-cardiotoxic Potent Topo II Poison, with Azacitidine, Cytarabine, Gemcitabine, Ifosfamide, Trabectedin, or Vincristine to Synergize Anticancer Effects and Identify Potential Clinical ApplicationsTrack: Experimental and Molecular TherapeuticsSession: PO.ET02.03. Drug Combination Strategies for Cancer TreatmentAbstract Number: 1683/ 14Presenter: Rafal Zielinski, Ph.D., Department of Experimental Therapeutics, Division of Cancer Medicine, MD Anderson Cancer CenterDate and Time: April 28, 2025, 9:00 AM – 12:00 PM ETLocation: Section 19For more information and to view the abstract, visit the AACR Annual Meeting website. About Moleculin Biotech, Inc. Moleculin Biotech, Inc. is a Phase 3 clinical stage pharmaceutical company advancing a pipeline of therapeutic candidates addressing hard-to-treat tumors and viruses. The Company’s lead program, Annamycin, is a next-generation anthracycline designed to avoid multidrug resistance mechanisms and to eliminate the cardiotoxicity common with currently prescribed anthracyclines. Annamycin is currently in development for the treatment of relapsed or refractory acute myeloid leukemia (AML) and soft tissue sarcoma (STS) lung metastases.The Company is initiating the MIRACLE (Moleculin R/R AML AnnAraC Clinical Evaluation) Trial (MB-108), a pivotal, adaptive design Phase 3 trial evaluating Annamycin in combination with cytarabine, together referred to as AnnAraC, for the treatment of relapsed or refractory acute myeloid leukemia. Following a successful Phase 1B/2 study (MB-106), with input from the FDA, the Company believes it has substantially de-risked the development pathway towards a potential approval for Annamycin for the treatment of AML. This study is subject to appropriate future filings with potential additional feedback from the FDA and their foreign equivalents.Additionally, the Company is developing WP1066, an Immune/Transcription Modulator capable of inhibiting p-STAT3 and other oncogenic transcription factors while also stimulating a natural immune response, targeting brain tumors, pancreatic and other cancers. Moleculin is also engaged in the development of a portfolio of antimetabolites, including WP1122 for the potential treatment of pathogenic viruses, as well as certain cancer indications. For more information about the Company, please visit www.moleculin.com and connect on X, LinkedIn and Facebook. Forward-Looking StatementsSome of the statements in this release are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, Section 21E of the Securities Exchange Act of 1934 and the Private Securities Litigation Reform Act of 1995, which involve risks and uncertainties. Forward-looking statements in this press release include, without limitation, the timing of the achievements of each of the milestones in this press release. Moleculin will require significant additional financing, for which the Company has no commitments, in order to conduct its clinical trials as described in this press release, and the milestones described in this press release assume the Company’s ability to secure such financing on a timely basis. Although Moleculin believes that the expectations reflected in such forward-looking statements are reasonable as of the date made, expectations may prove to have been materially different from the results expressed or implied by such forward-looking statements. Moleculin has attempted to identify forward-looking statements by terminology including ‘believes,’ ‘estimates,’ ‘anticipates,’ ‘expects,’ ‘plans,’ ‘projects,’ ‘intends,’ ‘potential,’ ‘may,’ ‘could,’ ‘might,’ ‘will,’ ‘should,’ ‘approximately’ or other words that convey uncertainty of future events or outcomes to identify these forward-looking statements. These statements are only predictions and involve known and unknown risks, uncertainties, and other factors, including those discussed under Item 1A. “Risk Factors” in our most recently filed Form 10-K filed with the Securities and Exchange Commission (SEC) and updated from time to time in our Form 10-Q filings and in our other public filings with the SEC. Any forward-looking statements contained in this release speak only as of its date. We undertake no obligation to update any forward-looking statements contained in this release to reflect events or circumstances occurring after its date or to reflect the occurrence of unanticipated events. Investor Contact:JTC Team, LLCJenene Thomas(908) 824-0775MBRX@jtcir.com

Phase 3AACR

15 Apr 2025

·flamingotx.com

Flamingo Therapeutics Announces Poster Presentation on the Immune-Modulatory Effects of Danvatirsen at the American Association for Cancer Research (AACR) Annual Meeting - Flamingo Therapeutics

Flamingo Therapeutics Announces Poster Presentation on the Immune-Modulatory Effects of Danvatirsen at the American Association for Cancer Research (AACR) Annual Meeting Leuven (Belgium), Strasbourg (France), Philadelphia (USA) – April 15, 2025 /PRNewswire/- Flamingo Therapeutics (“Flamingo”) today announced that an abstract has been accepted for presentation at the American Association for Cancer Research (AACR) annual meeting being held in Chicago, IL from April 25-30, 2025. Poster presentation details are as follows: Poster Title: “ASO-mediated STAT3 knockdown relieves immunosuppression sensitizing tumors to immunotherapies” Session Category/Title: Immunology/Modulation of Tumor Microenvironment: Enhancing Immunogenicity and Counteracting Suppression Session Time: 4/28/2025 9:00:00 AM - 12:00:00 PM Location: Poster Section 38 Published Abstract Number: 2244 For more information, please visit the AACR Annual Meeting 2025 website. About Flamingo Therapeutics Flamingo is pioneering RNA-targeted therapies for oncology with a clinical-stage pipeline targeting undruggable transcription factors and long non-coding RNAs. Flamingo has an alliance with Ionis Pharmaceuticals and is supported by well-known biotechnology investors including Abrdn (formerly funds managed by Tekla Capital Management LLC), Andera Partners, Bpifrance Large Venture, Bpifrance through its FABS and Fonds Biothérapies Innovantes et Maladies Rares funds, Eurazeo - Kurma Partners, Perceptive Advisors, PMV, Pontifax, Sphera, and VIB. Flamingo has initiated a Phase II trial ‘PEMDA-HN’ evaluating the STAT3 targeting agent danvatirsen, in combination with pembrolizumab, in patients with head and neck squamous cell carcinoma (HNSCC). A Phase I investigator initiated trial study has also been initiated evaluating danvatirsen as a monotherapy and in combination with venetoclax in AML/MDS patients. For more information on Flamingo, please visit: https://flamingotx.com PEMDA-HN (head and neck cancer) on clinicaltrials.gov: https://clinicaltrials.gov/study/NCT05814666 Danvatirsen monotherapy followed by combination with venetoclax in relapsed/ refractory AML and MDS on clincaltrials.gov: https://classic.clinicaltrials.gov/ct2/show/NCT05986240 Please engage with us on LinkedIn: https://www.linkedin.com/company/flamingo-therapeutics. Flamingo Media and Investor Contact: Amy Conrad Juniper Point (858) 366-3243 amy@juniper-point.com

ImmunotherapyAACRPhase 2Phase 1

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