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FDA approves first protein-destroying PROTAC drug for advanced breast cancer

FDA approves first protein-destroying PROTAC drug for advanced breast cancer

New Capabilities

Arvinas and Pfizer's vepdegestrant launches a drug class chemists have pursued for 25 years

May 1st, 2026: FDA approves VEPPANU, first PROTAC ever cleared

Overview

For 25 years, drug companies have tried to design medicines that destroy harmful proteins outright rather than blocking them. On May 1, the U.S. Food and Drug Administration (FDA) approved the first one.

VEPPANU, developed by biotech Arvinas and Pfizer, treats a hard-to-treat form of metastatic breast cancer. It hijacks the cell's own garbage-disposal system to shred the mutated estrogen receptor that fuels the tumor. The approval validates PROTACs (proteolysis targeting chimeras), a drug class first published in 2001 that had never produced a marketed medicine.

It opens a regulatory path for similar drugs aimed at proteins conventional medicines cannot touch, including drivers of cancer drug resistance, neurodegeneration, and inflammation. Roughly two dozen PROTACs from Arvinas, Kymera Therapeutics, Bristol Myers Squibb, Nurix, C4 Therapeutics, and Foghorn are now in human trials. VEPPANU's launch will shape which of them get funded next.

Why it matters

If PROTACs deliver, drugs may finally reach the roughly 80% of human proteins that conventional medicines cannot touch.

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Key Indicators

1st
PROTAC ever approved
VEPPANU is the first proteolysis-targeting chimera cleared by any major regulator.
25 years
From concept to clinic-ready
Crews, Sakamoto and Deshaies published the original PROTAC concept in 2001.
43%
Reduction in progression risk
Phase 3 VERITAC-2 result vs. fulvestrant in ESR1-mutated patients (hazard ratio 0.57).
5.0 vs 2.1
Median months without progression
Vepdegestrant more than doubled progression-free survival compared with the standard hormone therapy.
$50M
Approval milestone to Arvinas
Triggered by the FDA decision under the 2021 Pfizer collaboration.
$2.05B
Total Pfizer-Arvinas deal value
Combined upfront, equity, approval and commercial milestones from the 2021 partnership.
35 days
Approval ahead of deadline
FDA acted before the assigned June 5, 2026 review date.

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People Involved

Craig M. Crews
Craig M. Crews
Vindicated after a 25-year scientific bet

Organizations Involved

Arvinas
Arvinas
Biotechnology company
Receives $50M milestone; co-developer of first approved PROTAC

New Haven, Connecticut biotech founded by Craig Crews to translate PROTAC chemistry into approved medicines.
Pfizer Inc.
Pfizer Inc.
Pharmaceutical company
Co-developer; seeking third-party commercialization partner

Global pharmaceutical company whose oncology unit co-developed vepdegestrant under a 2021 partnership with Arvinas.
U.S. Food and Drug Administration
U.S. Food and Drug Administration
Federal Agency
Approved first-in-class PROTAC 35 days early

The agency responsible for approving new medicines for sale in the United States.
MG
Menarini Group / Stemline Therapeutics
Pharmaceutical company
Incumbent in same indication; faces new competition

Italian pharma group whose Stemline subsidiary markets elacestrant (Orserdu), the only previously approved drug specifically for ESR1-mutated breast cancer.

Timeline

July 2001 May 2026

9 events Latest: May 1st, 2026 · 1 month ago
Tap a bar to jump to that date

  1. FDA approves VEPPANU, first PROTAC ever cleared

    Latest Regulatory

    FDA approves vepdegestrant for ESR1-mutated, ER+/HER2− advanced or metastatic breast cancer 35 days ahead of the PDUFA deadline. Arvinas receives a $50M milestone payment.

  2. FDA accepts NDA, sets June 5 deadline

    Regulatory

    FDA accepts the application for review with a Prescription Drug User Fee Act (PDUFA) target action date of June 5, 2026.

  3. Partners decide to out-license commercial rights

    Corporate

    Arvinas and Pfizer announce they will jointly seek a third-party partner to commercialize vepdegestrant rather than launch it themselves; Arvinas restructures and lays off staff.

  4. New Drug Application submitted

    Regulatory

    Arvinas and Pfizer submit a New Drug Application to the FDA for vepdegestrant in ESR1-mutated, ER+/HER2− advanced breast cancer.

  5. VERITAC-2 Phase 3 topline reported

    Clinical results

    Vepdegestrant cuts progression risk 43% in ESR1-mutated patients vs. fulvestrant, but misses statistical significance in the broader intent-to-treat population, narrowing its likely label.

  6. Pfizer signs $2.05B vepdegestrant deal

    Corporate

    Pfizer pays Arvinas $650M upfront, buys $350M of equity and offers up to $1.05B in milestones for joint development and commercialization of ARV-471 (vepdegestrant).

  7. First PROTAC enters human trials

    Clinical milestone

    Arvinas dosed the first patient with ARV-110 (bavdegalutamide), an androgen receptor degrader for prostate cancer — the first PROTAC ever tested in humans.

  8. Arvinas founded

    Corporate

    Crews founds Arvinas in New Haven to translate PROTAC chemistry into drugs, seeded by Canaan Partners and 5AM Ventures.

  9. PROTAC concept published

    Scientific milestone

    Kathleen Sakamoto, Craig Crews and Ray Deshaies publish the founding PROTAC paper in PNAS, proposing chimeric molecules that recruit E3 ubiquitin ligases to degrade target proteins.

Historical Context

3 moments from history that rhyme with this story — and how they unfolded.

May 2001

Gleevec (imatinib) approval (2001)

FDA approved Novartis's imatinib for chronic myeloid leukemia in just 2.5 months, validating Brian Druker's argument that designing a small molecule to block a single cancer-driving kinase (BCR-ABL) could turn a fatal disease into a manageable one. The drug produced durable remissions in patients who had previously had a five-year survival of about 30%.

Then

Imatinib became the foundation of CML treatment and Novartis's biggest oncology product, validating targeted therapy as a paradigm.

Now

More than 70 kinase inhibitors have since been approved across cancers, building a multi-billion-dollar drug class that did not exist before Gleevec.

Why this matters now

Like PROTACs, kinase inhibitors were a long-pursued idea waiting for a first approval to unlock investor and regulator confidence. Gleevec's success made the next dozen kinase inhibitor approvals routine — the template VEPPANU may now provide for protein degraders.

June 1986

Muromonab-CD3 (OKT3) approval (1986)

FDA approved Ortho Biotech's OKT3 for organ transplant rejection — the first monoclonal antibody drug. The product was technically crude (a mouse antibody causing immune reactions), commercially modest, and clinically replaced within a decade. But it proved monoclonal antibodies could be manufactured, dosed, and reimbursed.

Then

OKT3 carved out a niche in transplant medicine but never became a blockbuster; the technology was clearly first-generation.

Now

It took 11 years before Rituxan (1997) showed antibodies could deliver oncology blockbusters. Today antibody drugs generate over $200 billion in annual sales — the largest single drug class.

Why this matters now

A first-in-class approval is not a guaranteed commercial success, and the first product is rarely the best one. PROTACs may follow OKT3's pattern: VEPPANU validates the platform, but the class-defining commercial winners may be drugs that have not yet reached late-stage trials.

August 2017

Kymriah (tisagenlecleucel) approval (2017)

FDA approved Novartis's tisagenlecleucel for relapsed pediatric leukemia, the first chimeric antigen receptor (CAR-T) cell therapy. The treatment produced complete remissions in roughly 80% of children whose cancers had failed conventional therapy, but it required custom manufacturing for each patient and listed at $475,000 per dose.

Then

Kymriah's narrow indication and complex logistics led to slower-than-expected uptake; six more CAR-T products followed within five years.

Now

CAR-T became standard of care for several blood cancers and attracted tens of billions in investment, though the broader promise — solid-tumor CAR-T, off-the-shelf manufacturing — is still unproven.

Why this matters now

Kymriah showed that a 'first' approval can simultaneously validate a platform and reveal hard scaling problems. PROTACs share some of that profile: the chemistry is complex, manufacturing is non-trivial, and broadening beyond the first cancer indication is the real test of the class.

Sources

(12)
+6
GlobeNewswire (Arvinas) BioPharma Dive OncLive U.S. Food and Drug Administration Healio Pfizer Arvinas Investor Relations FierceBiotech Wikipedia Nature Reviews Drug Discovery MedCity News U.S. Food and Drug Administration