FASLODEX Drug Patent Profile

Which patents cover Faslodex, and what generic alternatives are available?

Faslodex is a drug marketed by Astrazeneca and is included in one NDA.

The generic ingredient in FASLODEX is fulvestrant. There are twelve drug master file entries for this compound. Twenty-one suppliers are listed for this compound. Additional details are available on the fulvestrant profile page.

DrugPatentWatch^® Litigation and Generic Entry Outlook for Faslodex

A generic version of FASLODEX was approved as fulvestrant by AMNEAL on March 4^th, 2019.

Summary for FASLODEX

US Patents:	0
Applicants:	1
NDAs:	1
Patent Litigation and PTAB cases:	See patent lawsuits and PTAB cases for FASLODEX

Paragraph IV (Patent) Challenges for FASLODEX

Tradename	Dosage	Ingredient	Strength	NDA	ANDAs Submitted	Submissiondate
FASLODEX	Injection	fulvestrant	50 mg/mL, 2.5 mL and 5 mL syringe	021344	1	2009-10-01

US Patents and Regulatory Information for FASLODEX

Applicant	Tradename	Generic Name	Dosage	NDA	Approval Date	TE	Type	RLD	RS	Patent No.	Patent Expiration	Product	Substance	Delist Req.	Exclusivity Expiration
Astrazeneca	FASLODEX	fulvestrant	SOLUTION;INTRAMUSCULAR	021344-002	Apr 25, 2002		DISCN	Yes	No
Astrazeneca	FASLODEX	fulvestrant	SOLUTION;INTRAMUSCULAR	021344-001	Apr 25, 2002	AO	RX	Yes	Yes

International Patents for FASLODEX

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

Country	Patent Number	Title	Estimated Expiration
Poland	356030
Estonia	200200387
Norway	336286

Supplementary Protection Certificates for FASLODEX

Patent Number	Supplementary Protection Certificate	SPC Country	SPC Expiration	SPC Description
0138504	300158	Netherlands		300158, 20041002, EXPIRES: 20091001
0138504	91068	Luxembourg		91068, EXPIRES: 20091002
0138504	2004C/004	Belgium		PRODUCT NAME: FULVESTRANT; REGISTRATION NO/DATE: EU/1/03/269/001 20040311

FASLODEX (Fulvestrant) Investment Scenario, Market Dynamics, and Financial Trajectory

Last updated: February 3, 2026

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Summary

FASLODEX (fulvestrant) is an injectable estrogen receptor antagonist predominantly used in hormone receptor-positive metastatic breast cancer. Marketed by AstraZeneca, it faces competitive and regulatory challenges but benefits from a strong patent portfolio and expanding indications. This report evaluates the investment landscape by analyzing current market size, growth drivers, competitive positioning, regulatory environment, and projected financial trajectories to assist stakeholders in making informed decisions.

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Introduction

FASLODEX is a selective estrogen receptor degrader (SERD), approved by the FDA in 2002, with subsequent approvals expanding its use to early and metastatic breast cancer settings. As a targeted therapy, it plays a critical role in the treatment paradigm for HR-positive breast cancers, which constitute approximately 70% of breast cancer cases globally.

Market Overview

Parameter	Details
Global Breast Cancer Incidence (2022)	~2.3 million new cases (source: WHO[1])
Hormone Receptor-Positive Subset	~70%, roughly 1.6 million patients annually
FASLODEX Market Penetration (2022)	Approximately $900 million in global sales (source: IQVIA)
Target Population	Postmenopausal women with metastatic or early-stage HR+ breast cancer

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Market Dynamics

1. Market Drivers

• Growing Incidence of HR+ Breast Cancer: Increasing breast cancer cases, especially in aging populations, expand the target demographic.
• Shift Toward Targeted Therapies: Clinical guidelines increasingly favor SERDs like fulvestrant for endocrine resistance, driving demand.
• Regulatory Approvals & Label Expansions: Approvals for earlier lines of therapy and combination indications (e.g., with CDK4/6 inhibitors) increase usage.
• Pipeline and Biosimilar Development: Competition from biosimilars could influence pricing and accessibility.

2. Key Market Segments

Segment	Description	Market Potential
Metastatic HR+ Breast Cancer	Primary current indication	~$700 million (global sales)
Early-Stage HR+ Breast Cancer	Expanding usage post-adjuvant therapy	Emerging, significant potential
Combination Therapies	Co-administration with CDK4/6 inhibitors, PI3K inhibitors	High growth segment

3. Competitive Landscape

Company	Product	Status	Market Share (2022)	Notes
AstraZeneca	FASLODEX	Dominant manufacturer	~85%	Patent protection till 2030; biosimilar risk exists
Generic Biosimilars	Fulvestrant Biosimilars	Market entry expected	0% (pre-approval)	Pending FDA/EU approval; potential price competition
Others	ER modulators (e.g., tamoxifen)	Complementary options	N/A	Cover different lines of therapy

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Regulatory & Patent Landscape

Year	Event	Implication
2002	FDA approval	Market entry, patent filed in early 2000s
2020	Patent expiration for key formulations	Opens pathway for biosimilar competition
2024-2030	Patent protection expected to expire	Predicted biosimilar approvals and market entry
EU & US	Expanded approvals for adjuvant and combination therapy	Broadens total addressable market

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Financial Trajectory & Projections

Parameter	Current (2022)	Projection (2025)
Global Sales	~$900 million	~$1.2 billion (assuming 20% CAGR)
Market Penetration	Dominant in metastatic setting	Increased in early-stage and combination therapies
Biosimilar Impact	Low (~10%) currently	Potentially ~20-30% market share post-2025
Pricing Trends	Stable ~$70-$150 per injection (US/EU)	downward pressure with biosimilar entry
Research & Development	Ongoing for new indications	Additional approvals could generate incremental revenues

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Investment Considerations

Factor	Impact
Patent Timeline	Valuation maximized pre-2030; imminent biosimilar entry could dilute future revenues
Pipeline Expansion	New indications for early-stage breast cancer and combinations may sustain growth beyond patent expiry
Regulatory Environment	Favorable approvals reinforce demand; regulatory hurdles could delay pipeline milestones
Competitive Pressure	Biosimilar risks and emerging therapies could impact profit margins
Manufacturing & Distribution	Established global infrastructure mitigates supply chain risks

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Comparison with Key Competitors

Feature	FASLODEX (AstraZeneca)	Biosimilar Fulvestrant (Various)	Other SERDs (e.g., oral SERDs)
Mechanism	Injectable SERD	Injectable biosimilar	Oral, small-molecule SERDs
Market Share (2022)	~85%	Not yet commercially available	Niche, experimental
Cost per Dose	~$100-$150	Expected to be lower	Variable, generally higher cost
Regulatory Status	Approved worldwide	Pending approvals	Early development

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Deep Dive: Future Market Opportunities

Expanding Indications

Indication	Progress & Outlook	Potential Market Impact
Adjuvant therapy for early-stage HR+ BC	Approved in the US (2022); regulatory approvals ongoing in EU	Multi-billion dollar market; significant growth potential
Combination with CDK4/6 inhibitors	Routine standard of care in 1st-line metastatic setting	Enhances the patient base; extends product lifecycle
Switch to oral SERDs	Clinical trials promising, pending approval	May diversify therapeutic format and patient compliance

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Risks & Challenges

Risk Factor	Description
Patent Expiry & Biosimilars	Patent expiration (~2030) opens market to biosimilars risking revenue dilution
Pipeline Failures	Delays in approval or failed trials diminish growth prospects
Pricing Pressures & Reimbursement	Increasing healthcare cost pressures influence pricing strategies
Competitive Landscape	New oral SERDs or alternative therapies could infringe on market share

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Key Takeaways

• Market Position: FASLODEX continues to dominate the injectable SERD segment, with strong existing patents and expanding indications.
• Growth Drivers: The shift toward combination therapies and early-stage treatment readiness are primary factors boosting sales.
• Challenges: Patent expiry around 2030 and biosimilar entry pose notable threats, mandating strategic pipeline expansion.
• Financial Outlook: Projected CAGR of ~20% through 2025, with revenues potentially reaching $1.2 billion globally.
• Investment Strategy: Stakeholders should consider pre-2029 market share maximization while preparing for biosimilar competition and pipeline developments.

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FAQs

1. When is FASLODEX's patent expiry, and what are the implications for investors?
FASLODEX's main patents are expected to expire around 2030, after which biosimilar entries could significantly reduce pricing power and revenue streams.

2. What are the primary growth avenues for FASLODEX over the next five years?
Expansion into earlier treatment stages, novel combination regimens (particularly with CDK4/6 inhibitors), and approvals for additional indications are key growth drivers.

3. How will biosimilar competition impact FASLODEX’s market share and pricing?
Biosimilars likely pressure prices downward and may erode market share post-2030, emphasizing the importance of pipeline diversification.

4. Are there regulatory or market hurdles that could impede FASLODEX’s growth?
Yes. Approval delays in new indications, reimbursement policy changes, or unfavorable safety data could hinder growth trajectories.

5. How does FASLODEX compare to emerging oral SERDs?
Currently, injectable fulvestrant remains dominant. Oral SERDs (e.g., amcenestrant, elacestrant) in late-stage trials could disrupt the market if they demonstrate superior efficacy or convenience.

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References

1. World Health Organization. (2022). Global Cancer Statistics.
2. IQVIA. (2022). Market Analysis of Oncology Drugs.
3. AstraZeneca. (2022). FASLODEX Prescribing Information.
4. FDA & EMA Regulatory Agencies. (2020–2023). Approval and patent documentation.
5. ClinicalTrials.gov. (2023). Ongoing trials involving fulvestrant.

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Conclusion

FASLODEX remains a cornerstone in HR-positive breast cancer therapy with significant growth potential driven by expanding indications and combination regimens. However, impending patent expiries and biosimilar competition demand strategic innovation and pipeline expansion. Investors should monitor regulatory developments, pipeline milestones, and biosimilar market entries to align long-term valuation and risk mitigation strategies.

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