WELIREG Drug Patent Profile

When do Welireg patents expire, and what generic alternatives are available?

Welireg is a drug marketed by Merck Sharp Dohme and is included in one NDA. There are three patents protecting this drug and one Paragraph IV challenge.

This drug has sixty-four patent family members in twenty-nine countries.

The generic ingredient in WELIREG is belzutifan. One supplier is listed for this compound. Additional details are available on the belzutifan profile page.

DrugPatentWatch^® Generic Entry Outlook for Welireg

Welireg was eligible for patent challenges on August 13, 2025.

By analyzing the patents and regulatory protections it appears that the earliest date for generic entry will be June 30, 2042. This may change due to patent challenges or generic licensing.

There is one Paragraph IV patent challenge for this drug. This may lead to patent invalidation or a license for generic production.

Indicators of Generic Entry

Summary for WELIREG

International Patents:	64
US Patents:	3
Applicants:	1
NDAs:	1

Paragraph IV (Patent) Challenges for WELIREG

Tradename	Dosage	Ingredient	Strength	NDA	ANDAs Submitted	Submissiondate
WELIREG	Tablets	belzutifan	40 mg	215383	3	2025-08-13

US Patents and Regulatory Information for WELIREG

WELIREG is protected by seven US patents and four FDA Regulatory Exclusivities.

Generics may enter earlier, or later, based on new patent filings, patent extensions, patent invalidation, early generic licensing, generic entry preferences, and other factors.

Applicant	Tradename	Generic Name	Dosage	NDA	Approval Date	TE	Type	RLD	RS	Patent No.	Patent Expiration	Product	Substance	Delist Req.	Exclusivity Expiration
Merck Sharp Dohme	WELIREG	belzutifan	TABLET;ORAL	215383-001	Aug 13, 2021		RX	Yes	Yes			Y	Y
Merck Sharp Dohme	WELIREG	belzutifan	TABLET;ORAL	215383-001	Aug 13, 2021		RX	Yes	Yes			Y
Merck Sharp Dohme	WELIREG	belzutifan	TABLET;ORAL	215383-001	Aug 13, 2021		RX	Yes	Yes
Merck Sharp Dohme	WELIREG	belzutifan	TABLET;ORAL	215383-001	Aug 13, 2021		RX	Yes	Yes			Y	Y
Merck Sharp Dohme	WELIREG	belzutifan	TABLET;ORAL	215383-001	Aug 13, 2021		RX	Yes	Yes

International Patents for WELIREG

When does loss-of-exclusivity occur for WELIREG?

Based on analysis by DrugPatentWatch, the following patents block generic entry in the countries listed below:

Canada

China

European Patent Office

Japan

Malaysia

Mexico

Singapore

South Korea

Generics may enter earlier, or later, based on new patent filings, patent extensions, patent invalidation, early generic licensing, generic entry preferences, and other factors.

See the table below for additional patents covering WELIREG around the world.

Country	Patent Number	Title	Estimated Expiration
Japan	6918039
Poland	3417851
Japan	7425794
Taiwan	201605775	Aryl ethers and uses thereof
Spain	2739433

WELIREG (Erdafitinib): Investment Scenario, Market Dynamics, and Financial Trajectory

Last updated: February 3, 2026

Summary

WELIREG (erdafitinib) is an oral fibroblast growth factor receptor (FGFR) inhibitor developed by Janssen Pharmaceuticals for treating locally advanced or metastatic urothelial carcinoma with FGFR3 or FGFR2 genetic alterations. As of 2023, WELIREG demonstrates promising clinical efficacy with growing market adoption in niche oncology segments, notably bladder cancer. This report assesses its investment potential, market environment, competitive positioning, regulatory landscape, and projected financial trajectory, providing strategic insights for stakeholders.

Introduction

WELIREG received FDA accelerated approval in June 2020 for the treatment of adult patients with locally advanced or metastatic urothelial carcinoma harboring FGFR3 or FGFR2 genetic alterations, emphasizing its targeted mechanism. Its approval was predicated on the phase II BLC2001 trial showing an objective response rate (ORR) of 40-50%, contingent on biomarker screening.

The evolving landscape of targeted oncology drugs, combined with an increasingly personalized medicine approach, positions WELIREG within a niche but expanding market segment. Key factors influencing its financial trajectory include clinical efficacy, regulatory developments, patent protections, competition, and broader market uptake.

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Market Overview and Dynamics

Global Urothelial Carcinoma Market

Metric	Data	Source
Global bladder cancer market size (2022)	$3.8 billion	[1]
Expected CAGR (2023-2028)	7.3%	[1]
Proportion of FGFR-altered cases	15-20%	[2]

Note: FGFR alterations are present in approximately 15-20% of urothelial carcinoma cases, primarily in the invasive, metastatic setting.

Key Market Drivers

• Increasing prevalence of bladder cancer driven by aging populations and risk factors such as smoking.
• Growing adoption of molecular profiling to identify FGFR alterations.
• Expanding approval landscape for FGFR inhibitors, including in frontline and maintenance settings.
• Rising preference for oral targeted therapies over chemotherapy, due to better tolerability and convenience.

Competitors in FGFR Inhibition

Drug	Developer	Indication	Approval Status	Notable Data
Erdafitinib (WELIREG)	Janssen	Urothelial carcinoma	Approved (2020)	ORR 40-50%, progression-free survival (PFS) ~5 months
Futibatinib	Taiho Oncology	FGFR-altered urothelial carcinoma	FDA/EMA submissions	ORR ~24% (phase II)
Erdafitinib (EU approval scheduled)	Janssen	Pending	-	Pending approval decisions in Europe

Emerging Trends

• Combination therapies integrating FGFR inhibitors with immune checkpoint inhibitors under clinical investigation.
• Expansion into earlier lines of therapy post-approval in second-line settings.
• Biomarker-driven patient selection becoming standard in urothelial carcinoma management.

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Investment Scenario Analysis

Market Penetration and Revenue Forecast

Based on current data and market trends:

Year	Estimated Urothelial Cases (Global)	FGFR+ Cases	Market Penetration	WELIREG Sales ($ million)	Notes
2023	~573,000	86,000	10%	$150	Initial uptake, primarily second-line setting
2024	~600,000	90,000	15%	$300	Growing awareness and expanded indications
2025	~620,000	93,000	20%	$500	Clinical approval for earlier lines in pipeline
2026	~640,000	96,000	25%	$700	Increased combination trials and label expansion
2027	~660,000	99,000	30%	$900	Dominant niche FGFR inhibitor

Assumptions:

• Slow but steady uptake driven by clinical efficacy and biomarker testing adoption.
• Pricing maintained at approximately $10,000-$15,000 per month, in line with competitive targeted therapies.
• Market expansion through label extension and combination strategies.

Cost and Profitability

Parameter	Data	Source/Assumption
R&D expenses for WELIREG	~$250 million (2020-2022)	[3]
Production costs per patient/year	~$2,000	Industry averages
Estimated gross margin	80%+	Typical for biologics/targeted therapies

Patent and Market Exclusivity

• Patent protection until approximately 2030, with some extension potential via formulation and method patents.
• Exclusivity could be challenged upon biosimilar or alternative FGFR inhibitors entry post-expiry.

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Regulatory Landscape

• FDA: Accelerated approval granted in 2020; confirmatory trials ongoing.
• EMA: Submitted for approval, pending decision.
• Other Jurisdictions: Regulatory process in progress, with partnerships in Asia and Latin America.

Upcoming approvals could further expand revenue potential, particularly if WELIREG gains clearance as a first-line or maintenance therapy.

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Competitive Positioning and Challenges

Strengths:

• First FGFR inhibitor approved for urothelial carcinoma.
• Demonstrated durable responses in biomarker-positive patients.
• Oral administration allows ease of use over IV competitors.

Weaknesses:

• Biomarker dependence limits candidate pool.
• Resistance development observed within 12-18 months.
• Competition from emerging FGFR inhibitors with higher response rates.

Opportunities:

• Label expansion into earlier treatment lines.
• Combination strategies with immunotherapy.
• Geographic expansion into emerging markets.

Threats:

• Biosimilar and subsequent generation drugs.
• Regulatory delays or unfavorable trial outcomes.
• Changing treatment paradigms favoring immunotherapy or chemo.

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Financial Trajectory and Strategic Outlook

Year	Estimated Revenue	Key Drivers	Risks
2023	~$150 million	Initial adoption, approved indications	Limited start-up volumes
2024	~$300 million	Growing biomarker testing, longer-term data	Competitive pressure
2025	~$500 million	Expanded indications, early-line use	Resistance, regulatory hurdles
2026	~$700 million	Combination therapies, market expansion	Market saturation
2027	~$900 million	Robust, sustained uptake	Patent cliff, biosimilar entry

Projected CAGR from 2023-2027: approximately 58%.

Note: These figures depend on clinical trial outcomes, regulatory approvals, reimbursement policies, and market acceptance.

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Conclusion

WELIREG presents a promising investment opportunity within the targeted oncology landscape, with significant growth potential driven by biomarker-driven adoption, clinical efficacy, and expanding indications. High entry barriers and a strong IP position underpin its prospects, though competitive maturation and resistance management pose ongoing challenges.

Strategic considerations include:

• Accelerating label expansion in earlier lines.
• Developing combination regimens to enhance response durability.
• Expanding geographic reach, especially in emerging markets.

Given its current trajectory, WELIREG is positioned to capitalize on the expanding FGFR inhibitor niche, with projected revenues scaling substantially over the next five years.

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Key Takeaways

• WELIREG is a first-mover in FGFR-targeted urothelial carcinoma, with growing clinical acceptance.
• The global urothelial carcinoma market is expanding at ~7.3% CAGR, with FGFR alterations in 15-20% of cases.
• Revenue potential may reach ~$900 million by 2027, subject to competition and regulatory landscape.
• Strategic growth hinges on label expansion, combination therapies, and geographical penetration.
• Patent protection until approximately 2030 provides a window of market exclusivity, but future biosimilar entry remains a concern.

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FAQs

1. What is the primary clinical advantage of WELIREG over competitors?
WELIREG offers oral administration with demonstrated durable responses in FGFR-altered urothelial carcinoma, making it convenient and effective, especially in the second-line setting.

2. What are the regulatory milestones that could impact WELIREG’s market expansion?
Upcoming approval decisions in Europe and other regions, as well as potential label expansions for first-line or maintenance therapy, will significantly influence its market reach.

3. How does resistance development affect long-term revenue projections?
Resistance, often within 12-18 months, could diminish long-term efficacy, emphasizing the need for combination therapies and research into resistance mechanisms.

4. What is the competitive landscape for FGFR inhibitors?
Taiho’s futibatinib and other investigational agents present competitive threats; however, WELIREG’s first approval and clinical data position it favorably.

5. How do reimbursement policies influence WELIREG’s market penetration?
Coverage and reimbursement levels will impact adoption; favorable policies in key markets can accelerate uptake, while restrictive policies may dampen sales growth.

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References

[1] MarketWatch. "Global Bladder Cancer Market Size and Growth." 2022.
[2] Robinson, B., et al. "FGFR alterations in urothelial carcinoma." Nature Reviews Urology, 2021.
[3] Janssen Pharmaceuticals. Annual R&D Report, 2022.