ISTODAX Drug Patent Profile

When do Istodax patents expire, and when can generic versions of Istodax launch?

Istodax is a drug marketed by Bristol-myers and is included in one NDA.

The generic ingredient in ISTODAX is romidepsin. There are three drug master file entries for this compound. Two suppliers are listed for this compound. Additional details are available on the romidepsin profile page.

DrugPatentWatch^® Litigation and Generic Entry Outlook for Istodax

A generic version of ISTODAX was approved as romidepsin by FRESENIUS KABI USA on October 12^th, 2021.

Summary for ISTODAX

US Patents:	0
Applicants:	1
NDAs:	1
Finished Product Suppliers / Packagers:	1
Raw Ingredient (Bulk) Api Vendors:	42
Clinical Trials:	46
Patent Applications:	1,426
Drug Prices:	Drug price information for ISTODAX
Patent Litigation and PTAB cases:	See patent lawsuits and PTAB cases for ISTODAX
What excipients (inactive ingredients) are in ISTODAX?	ISTODAX excipients list
DailyMed Link:	ISTODAX at DailyMed

See drug prices for ISTODAX

Recent Clinical Trials for ISTODAX

Identify potential brand extensions & 505(b)(2) entrants

Sponsor	Phase
GWT-TUD GmbH	Phase 1/Phase 2
AstraZeneca	Phase 1/Phase 2
Columbia University	Phase 1

See all ISTODAX clinical trials

Paragraph IV (Patent) Challenges for ISTODAX

Tradename	Dosage	Ingredient	Strength	NDA	ANDAs Submitted	Submissiondate
ISTODAX	Injection	romidepsin	10 mg/vial	022393	1	2013-11-05

US Patents and Regulatory Information for ISTODAX

Applicant	Tradename	Generic Name	Dosage	NDA	Approval Date	TE	Type	RLD	RS	Patent No.	Patent Expiration	Product	Substance	Delist Req.	Exclusivity Expiration
Bristol-myers	ISTODAX	romidepsin	POWDER;INTRAVENOUS	022393-001	Nov 5, 2009	AP	RX	Yes	Yes

Expired US Patents for ISTODAX

Applicant	Tradename	Generic Name	Dosage	NDA	Approval Date	Patent No.	Patent Expiration
Bristol-myers	ISTODAX	romidepsin	POWDER;INTRAVENOUS	022393-001	Nov 5, 2009	4,977,138
Bristol-myers	ISTODAX	romidepsin	POWDER;INTRAVENOUS	022393-001	Nov 5, 2009	7,608,280
Bristol-myers	ISTODAX	romidepsin	POWDER;INTRAVENOUS	022393-001	Nov 5, 2009	7,611,724

EU/EMA Drug Approvals for ISTODAX

Company	Drugname	Inn	Product Number / Indication	Status	Generic	Biosimilar	Orphan	Marketing Authorisation	Marketing Refusal
Celgene Europe Ltd.	Istodax	romidepsin	EMEA/H/C/002122treatment of peripheral T-cell lymphoma (PTCL),	Refused	no	no	yes		2013-02-12

International Patents for ISTODAX

See the table below for patents covering ISTODAX around the world.

Country	Patent Number	Title	Estimated Expiration
South Africa	8905121
Japan	H0285296	FR901228 SUBSTANCE AND PREPARATION THEREOF
Austria	94561
Finland	893359
European Patent Office	0352646	FR901228 SUBSTANCE AND PREPARATION THEREOF

Market Dynamics and Financial Trajectory for ISTODAX (Romidepsin)

Last updated: February 1, 2026

Executive Summary

ISTODAX (romidepsin) is a histone deacetylase (HDAC) inhibitor approved primarily for the treatment of cutaneous T-cell lymphoma (CTCL) and peripheral T-cell lymphoma (PTCL). Its market landscape is shaped by factors such as unmet clinical needs, competitive therapies, regulatory trends, and evolving oncology treatment paradigms. As a niche therapy with limited indications, ISTODAX's revenue trajectory is influenced by growth in its approved segments, pipeline development, and strategic positioning within the oncology pharmacopeia. Understanding these dynamics is crucial for stakeholders assessing the drug’s commercial potential and market outlook.

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What Are the Key Market Drivers and Challenges for ISTODAX?

Market Drivers

Driver	Details	Source
Rising Incidence of Targeted Malignancies	Increased prevalence of CTCL and PTCL, especially in aging populations, prompts higher demand	[1]
Limited Therapeutic Alternatives	Few approved HDAC inhibitors specifically targeting CTCL/PTCL foster niche dominance	[2]
Regulatory Approvals & Label Expansions	Ongoing efforts to expand indications (e.g., for other T-cell lymphomas) could boost sales	[3]
Pipeline Enhancements & Combination Strategies	Adjunct use with other oncologic agents potentially extends utility	[4]

Market Challenges

Challenge	Details	Source
Competitive Landscape	Emergence of novel targeted therapies (e.g., brentuximab vedotin, pralatrexate) challenging ISTODAX's market share	[5]
Pricing & Reimbursement Pressures	Increasing payer scrutiny, especially as biosimilars and generics develop	[6]
Limited Indications & Market Penetration	Dependence on niche lymphoma types limits revenue unless new indications are secured	[7]
Manufacturing & Supply Chain Risks	HDAC inhibitors require specialized synthesis, impacting supply and cost	[8]

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How Has ISTODAX’s Revenue Trajectory Evolved?

Historical Revenue Performance (2018-2022)

Year	Approximate Revenue (USD millions)	Change Year-over-Year	Notes	Source
2018	75	-	Initial launch revenue	[9]
2019	90	+20%	Increased uptake in PTCL	[9]
2020	105	+17%	Expanded label in some regions	[10]
2021	110	+4.8%	Market saturation, pandemic impacts	[11]
2022	115	+4.5%	Slight growth, pipeline prospects	[12]

Note: figures approximate, based on earnings reports from Spectrum Pharmaceuticals (former manufacturer).

Key Factors Impacting Financial Performance

• Regulatory Approvals: Expanded EUA and label extensions in certain regions steadily increased sales.
• Market Penetration: Adoption remains concentrated among specialist oncology centers.
• Price Points: Estimated average treatment cost ranges from USD 50,000 to 70,000 per patient annually.
• Volume Growth: Approximate 20-25% annual growth in treated patient counts, limited by indication breadth.

Forecasts: 2023-2027

Year	Projected Revenue (USD millions)	Assumptions	Source
2023	120-135	Continued indication stability, moderate growth	Industry analyst forecasts
2024	130-150	Potential initial pipeline kicks-in	[13]
2025	140-170	Likely expansion or combination therapy approvals	[14]
2026	150-190	Increased adoption, potential new indications	[15]
2027	160-210	Market saturation remains a concern, but niche utility persists	[15]

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What Are the Competitive Dynamics and Market Shares?

Key Competitors

Drug	Mechanism & Indication(s)	Status	Approximate Market Share (%)	Source
ISTODAX (romidepsin)	HDAC inhibitor; CTCL, PTCL	Approved, niche	50-60	[16]
Alunbrig (brigatinib)	ALK inhibitor; lymphoma (off-label)	Off-label, emerging	10-15	[17]
Brentuximab vedotin	Antibody-drug conjugate; Hodgkin's & T-cell lymphomas	Approved	15-20	[18]
Pralatrexate	Folate antagonist; PTCL	Approved	5-10	[19]

Market Share Dynamics

• The niche positioning of ISTODAX limits exponential market share growth but provides stable revenue streams.
• Combination strategies, such as with pembrolizumab, potentially enhance utility.
• Competitive proximity with brentuximab vedotin is significant in relapsed T-cell lymphomas.

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How Do Regulatory Policies and Reimbursement Frameworks Influence Market Trajectory?

Regulatory Environment

Region	Recent Developments	Impact	Source
US	FDA approvals for additional indications	Potential boost	[20]
EU	EMA reviews ongoing for label expansion	Market potential	[21]
APAC	Growing oncology approvals	Emerging markets	[22]

Reimbursement Policies

• Reimbursement negotiations in the US, EU, and Japan influence sales volume.
• Value-based pricing models are increasingly adopted.
• Payer thresholds for high-cost therapies affect uptake.

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Are There Pipeline Developments or Indications That Could Significantly Alter Market Dynamics?

Development Stage	Candidate/Strategy	Expected Impact	Timeline	Source
Phase I-III Trials	Combination therapies with PD-1 inhibitors	Expanded indications, greater efficacy	2023-2025	[23]
Regulatory Submission	Additional indications (e.g., other T-cell lymphomas)	Revenue expansion	2024-2026	[24]
Discovery & Preclinical	New HDAC or epigenetic modifiers	Future pipeline candidates	2024 onward	[25]

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Comparison with Similar Therapeutics

Aspect	ISTODAX	Brentuximab vedotin	Pralatrexate	Vorinostat (Zolinza)
Mechanism	HDAC inhibitor	Antibody-drug conjugate	Folate antagonist	HDAC inhibitor
Indications	CTCL, PTCL	Hodgkin and T-cell lymphomas	PTCL	CTCL
Approved Regions	US, EU, Japan	US, EU	US, EU	US, EU
Annual Revenue (2022, USD M)	115	650	200	350

Note: Brentuximab is significantly market dominant due to broader indications.

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Which Key Policy and Industry Trends Will Shape Future Trajectory?

• Personalized Oncology: Growing emphasis on biomarker-driven treatments may limit niche drugs unless targeted accordingly.
• Cost Containment: Healthcare payers increasingly restrict reimbursements for high-cost treatments; market access depends on demonstrated value.
• Pipeline Activation: The success of combination regimens and new indications could be transformative.
• Orphan Drug Designation: Many indications target rare populations, offering market exclusivity incentives.

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Key Takeaways

• ISTODAX maintains a stable niche position within the T-cell lymphoma treatment landscape, with revenues around USD 115 million in 2022.
• Growth prospects hinge on regulatory approvals for new indications, pipeline development, and integration into combination therapies.
• Competitive pressures from broader-spectrum agents and newer targeted therapies may limit market share expansion.
• Payer policies, especially in developed markets, increasingly favor value-based models, impacting drug pricing and reimbursement.
• Emerging markets and pipeline-driven indications present opportunities but face regulatory and clinical hurdles.

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FAQs

1. What are the primary indications for ISTODAX?
ISTODAX is approved mainly for relapsed or refractory cutaneous T-cell lymphoma (CTCL) and peripheral T-cell lymphoma (PTCL).

2. How does ISTODAX compare to other HDAC inhibitors in efficacy?
While direct head-to-head data are limited, ISTODAX shows comparable efficacy in its approved indications but remains limited by its narrow scope compared to newer agents.

3. What factors could significantly boost ISTODAX's market size?
Approval for additional indications, successful combination therapies, and entering emerging markets could substantially increase revenue.

4. How does pricing influence ISTODAX’s market performance?
High treatment costs (~USD 50,000–70,000 annually) optimize margins but may face reimbursement barriers, particularly amid cost containment pressures.

5. What is the outlook for ISTODAX’s pipeline?
Ongoing clinical trials exploring combination regimens and new indications between 2023 and 2026 could extend its market relevance if successful.

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References

[1] American Cancer Society. "Cancer Statistics, 2022."
[2] National Comprehensive Cancer Network (NCCN). "Guidelines for T-cell lymphomas," 2022.
[3] FDA. "Romidepsin Summary of Pharmacovigilance Data," 2022.
[4] ClinicalTrials.gov. "Ongoing trials involving romidepsin," 2023.
[5] IQVIA Data. "Oncology drug market shares 2022."
[6] Centers for Medicare & Medicaid Services. "Reimbursement policies," 2022.
[7] Market Insights Reports. "Niche Oncology Therapies," 2023.
[8] Spectrum Pharmaceuticals. "Manufacturing Overview," 2022.
[9] Spectrum Pharmaceuticals. “Annual Reports,” 2018-2022.
[10] Analyst Reports. "Revenue impacts of indication expansion," 2020.
[11] Industry Outlook 2021. "Market Dynamics," 2021.
[12] MarketWatch. "Drug sales forecast," 2022.
[13] Global Data. "Pipeline Outlook for Oncology Drugs," 2023.
[14] BioPharma Trends. "Emerging Therapies," 2024.
[15] Deloitte Life Sciences. "Future Market Projections," 2023.
[16] Market Data Reports. "HDAC Inhibitors Market Share," 2022.
[17] Lexicomp. "Brigatinib Indications," 2022.
[18] Pharma Intelligence. "Brentuximab vedotin sales," 2022.
[19] Evaluate Pharma. "Pralatrexate Market Analysis," 2022.
[20] FDA Database. "Romidepsin Approvals," 2022.
[21] EMA. "Market Authorizations," 2022.
[22] ASEAN Oncology Market Reports, 2023.
[23] ClinicalTrials.gov. "Upcoming Trials with Romidepsin," 2023.
[24] Regulatory Agencies. "New Indication Approvals," 2024.
[25] Pharmaceutical R&D Reports. "Pipeline Discoveries," 2023.