The HDAC inhibitor pipeline remains active, with several next-generation agents advancing in clinical trials. Abexinostat (Xynomic Pharmaceuticals) is in Phase III development for renal cell carcinoma, representing a potential expansion into solid tumors. Quisinostat (Viriom) is in Phase II for uveal melanoma, and Entinostat, partnered between EOC Pharma and Syndax, is being explored in Hodgkin lymphoma.
LAS VEGAS, Aug. 20, 2025 /PRNewswire/ -- DelveInsight's
HDAC Inhibitors Market Size, Target Population, Competitive Landscape & Market Forecast report includes a comprehensive understanding of current treatment practices, addressable patient population, which includes top indications such as Multiple Myeloma, Peripheral T-cell Lymphoma (PTCL), Cutaneous T-cell Lymphoma (CTCL), Amyotrophic Lateral Sclerosis (ALS), and others. The selected indications are based on approved therapies and ongoing pipeline activity. The report also provides insights into the emerging HDAC inhibitors, market share of individual therapies, and current and forecasted market size from 2020 to 2034, segmented into 7MM.
Key Takeaways from the HDAC Inhibitors Market Report
As per DelveInsight's analysis, the total market size of HDAC inhibitors in the 7MM is expected to surge significantly by 2034.
The report provides the total potential number of patients in the indications, such as
Multiple Myeloma, Peripheral T-cell Lymphoma (PTCL), Cutaneous T-cell Lymphoma (CTCL), Amyotrophic Lateral Sclerosis (ALS), and others.
Leading HDAC inhibitor companies, such as
Xynomic Pharmaceuticals, Viriom, EOC Pharma, Syndax Pharmaceuticals, Jubilant Therapeutics, and others, are developing novel HDAC inhibitors that can be available in the HDAC inhibitors market in the coming years.
Some of the key HDAC inhibitors in the pipeline include
Abexinostat, Quisinostat, Entinostat, JBI-802, and others.
Discover which indication is expected to grab the major HDAC inhibitors market share @
HDAC Inhibitors Market Report
HDAC Inhibitors Overview
Histone deacetylases (HDACs) remove acetyl groups from both histone and non-histone proteins. Because acetylation of histones is linked to an open chromatin structure and active gene transcription, HDAC activity leads to histone deacetylation and epigenetic suppression of gene expression. Since HDACs influence many pathways involved in cancer development, HDAC inhibitors (HDACis) show clinical effects through several mechanisms, including changes in gene expression of cell cycle and apoptotic proteins, acetylation of other proteins involved in cell growth and survival, effects on angiogenesis, aggresome formation, and DNA repair.
There are 18 known HDACs, divided into two major groups and four classes based on their cellular location, homology, enzyme mechanism, sequence of discovery, and histone substrate specificity. The first group includes zinc-dependent HDACs, which all share a similar catalytic core for deacetylating acetyl-lysine residues. These comprise Class I (HDAC1, -2, -3, -8), Class II (IIa: HDAC4, -5, -7, -9; IIb: HDAC6, -10), and Class IV (HDAC11). The second group includes Class III HDACs (sirtuins, SIRT1–7), which rely on NAD+ for their enzymatic activity.
HDAC Inhibitors Epidemiology Segmentation
The HDAC inhibitors market report proffers epidemiological analysis for the study period 2020–2034 in the 7MM, segmented into:
Total Cases of Selected Indications for HDAC Inhibitor
Total Eligible Patient Pool of Selected Indications for HDAC Inhibitor
Total Treated Cases of Selected Indications for HDAC Inhibitor
HDAC Inhibitors Treatment Market
Several HDAC inhibitors are currently available on the market. Recent entrants include
DUVYZAT (givinostat), while earlier approved drugs include
BELEODAQ (belinostat),
HIYASTA (tucidinostat), among others.
DUVYZAT is a histone deacetylase inhibitor approved for treating Duchenne muscular dystrophy (DMD) in patients aged 6 and above. While it is categorized as an HDAC inhibitor, its exact mechanism of action in DMD is not fully understood. In April 2025, Italfarmaco announced that the CHMP of the European Medicines Agency (EMA) issued a positive opinion on DUVYZAT. The drug is also being evaluated in other indications: Phase III trial in Becker muscular dystrophy (BMD) and Phase II trial in polycythemia vera.
HIYASTA (HBI-8000) is an epigenetic immunomodulator approved for several indications, including use as monotherapy for certain subtypes of relapsed or refractory T-cell non-Hodgkin's lymphoma, specifically adult T-cell leukemia-lymphoma (ATLL) and peripheral T-cell lymphoma (PTCL) in Japan. HUYABIO International is conducting a multinational Phase III trial evaluating HIYASTA in combination with nivolumab for previously untreated metastatic or unresectable malignant melanoma. HIYASTA is an oral HDAC Class I inhibitor that induces cell cycle arrest and apoptosis in tumor cells, which underlies its efficacy in lymphoma.
In September 2020, the Japanese Ministry of Health, Labour and Welfare (MHLW) granted orphan drug designation (ODD) to HIYASTA for relapsed/refractory ATL, and in December 2015 for PTCL. In June 2021, HUYABIO also received regulatory approval in Japan for HBI-8000 as monotherapy for relapsed/refractory ATL.
Key Emerging HDAC Inhibitors and Companies
Xynomic Pharmaceuticals (Abexinostat),
Viriom (Quisinostat),
EOC Pharma/Syndax Pharmaceuticals (Entinostat),
Jubilant Therapeutics (JBI-802), and several other companies are currently engaged in the development and production of HDAC inhibitors, which have the potential to significantly impact and enhance the HDAC inhibitors market.
Abexinostat, an oral, broad-spectrum HDAC inhibitor originally developed by Pharmacyclics and later licensed by Xynomic Pharmaceuticals in 2017, has demonstrated encouraging activity in both blood cancers and solid tumors. The drug is currently being studied in several Phase I to III clinical trials worldwide.
In September 2019, Xynomic announced that the FDA had granted
Fast Track Designation (FTD) to abexinostat as a monotherapy for fourth-line treatment of relapsed or refractory follicular lymphoma. The FDA had previously granted FTD for abexinostat in combination with pazopanib for first- or second-line therapy in renal cell carcinoma. Additional Phase II trials are underway in indications such as Diffuse Large B-cell Lymphoma (DLBCL) and Follicular Lymphoma.
Quisinostat is another potent, selective oral pan-HDAC inhibitor, initially developed by Janssen Pharmaceuticals. HDAC inhibitors work by inducing cell cycle arrest, promoting differentiation, and triggering apoptosis in various human cancer cell lines. By inhibiting histone deacetylase, they increase acetylation of histone proteins, resulting in a more transcriptionally active chromatin state and altered gene expression involved in proliferation, apoptosis, and differentiation.
Multiple preclinical studies and Phase I/II trials have evaluated quisinostat's safety and effectiveness, showing promising anti-tumor effects in several advanced and treatment-resistant cancers — including platinum-resistant ovarian cancer (in combination with paclitaxel and carboplatin), uveal melanoma, and synovial sarcoma.
The anticipated launch of these emerging therapies are poised to transform the HDAC inhibitors market landscape in the coming years. As these cutting-edge therapies continue to mature and gain regulatory approval, they are expected to reshape the HDAC inhibitors market landscape, offering new standards of care and unlocking opportunities for medical innovation and economic growth.
To know more about HDAC inhibitors clinical trials, visit @
HDAC Inhibitors Treatment
Recent Developments in the HDAC Inhibitors Space
In
May 2025, Amylyx Pharmaceuticals announced positive Week 48 data from the Phase II open-label HELIOS clinical trial of AMX0035 in adults living with Wolfram syndrome.
In
May 2025, the University of Miami, in collaboration with Viriom, initiated a Phase II clinical trial in the US (NCT06932757) to evaluate an oral therapy for patients with uveal melanoma who have undergone at least one prior line of treatment.
In
April 2025, Xynomic Pharmaceuticals concluded a Phase I/II clinical trial in the United States (NCT03939182), evaluating a combination oral therapy for patients with Diffuse Large B-cell Lymphoma and Mantle Cell Lymphoma who had received at least one prior line of treatment.
Discover more about HDAC inhibitors in development @
HDAC Inhibitors Clinical Trials
HDAC Inhibitors Market Dynamics
HDAC inhibitors are a class of epigenetic drugs that modify gene expression by altering chromatin structure. Initially developed as anticancer agents, they have shown
significant therapeutic potential in various malignancies, especially hematologic cancers like T-cell lymphoma and multiple myeloma. The market initially gained traction with FDA approvals of drugs such as
Vorinostat, Romidepsin, and Panobinostat. Their unique mechanism of action targeting epigenetic regulation drew interest as precision medicine and oncology research grew, driving pharmaceutical investment in this segment.
The HDAC inhibitors market continues to expand largely due to the
rising prevalence of cancer worldwide and the
need for more targeted therapies with better safety profiles. Additionally,
ongoing clinical trials are exploring HDAC inhibitors in combination with other therapies, such as immune checkpoint inhibitors, proteasome inhibitors, and traditional chemotherapeutics. These combination approaches aim to overcome resistance and enhance efficacy, creating more opportunities for market growth. As more data emerges demonstrating synergistic benefits,
partnerships between biotech startups and large pharmaceutical firms are accelerating further development.
Despite this positive outlook, the market faces several challenges. Many HDAC inhibitors are associated with
toxicity issues such as fatigue, gastrointestinal disturbances, and thrombocytopenia, which
limit broader adoption.
Competition from newer targeted therapies and immuno-oncology drugs also puts pressure on the HDAC inhibitor segment. Moreover, several compounds
failed in late-stage trials due to a lack of efficacy, leading to cautious investor sentiment and prioritization of combination rather than monotherapy approaches.
Looking ahead, the market dynamics are expected to be shaped
increasingly by precision oncology trends and biomarker-driven patient selection, allowing more effective targeting of responders. If safety profiles can be improved and combination regimens continue to show strong results, HDAC inhibitors will retain a meaningful role in the evolving oncology landscape. Novel formulations,
selective HDAC isoform inhibitors, and expansion into non-oncology indications such as neurodegenerative or inflammatory diseases may further diversify the market and drive its next phase of growth.
Learn more about the HDAC inhibitors @
HDAC Inhibitors Analysis
Scope of the
HDAC Inhibitors
Market Report
HDAC Inhibitors Therapeutic Assessment: HDAC Inhibitors' current marketed and emerging therapies
HDAC Inhibitors
Market Dynamics: Conjoint Analysis of Emerging HDAC Inhibitor Drugs
Competitive Intelligence Analysis: SWOT analysis and Market entry strategies
Unmet Needs, KOL's views, Analyst's views, HDAC Inhibitors Market Access and Reimbursement
Table of Contents
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