New evidence for established standard-of-care therapies, with updates for LORBRENA^® in ALK-positive metastatic non‑small cell lung cancer and a BRAFTOVI^® regimen in a type of BRAF-mutant colorectal cancer
Extending potential impact of innovative therapies in earlier lines of treatment, including TALZENNA^® plus XTANDI^® in metastatic castration-sensitive prostate cancer and TUKYSA^® as first-line maintenance for HER2-positive breast cancer
New and updated data from next-generation pipeline of novel mechanisms and differentiated combinations across solid tumors, including sigvotatug vedotin, PF-08634404 and atirmociclib

Pfizer Inc. (NYSE:PFE) will present new data across its diverse, industry-leading Oncology pipeline and portfolio at the American Society of Clinical Oncology (ASCO) Annual Meeting, May 29 – June 2, 2026, in Chicago. Data from more than 40 company-sponsored, investigator-sponsored and collaborative research abstracts, including three late-breaking sessions and eight oral and rapid oral presentations, will be shared. These data highlight Pfizer's leadership in establishing potential new standards of care across multiple cancer types and its next-generation pipeline of novel targets and combination strategies designed to extend impact into broader patient populations and earlier lines of therapy.

"For people living with cancer and their families, every moment matters. We are moving with urgency to drive advances that have the potential to change standards of care – and striving to bring new, innovative options to patients in earlier lines of therapy," said Jeff Legos, Chief Oncology Officer, Pfizer. "Our progress is evident in the data presented at ASCO this year, which span our portfolio of established therapies, as well as next-generation, early-stage clinical research from one of the industry's largest oncology R&D programs. Together, these results reinforce our ability to advance breakthroughs that may redefine clinical practice and change the lives of people with cancer."

Key highlights of Pfizer's presence at ASCO include:

Sharing new evidence for standard-of-care therapies in certain types of biomarker-driven colorectal and lung cancers

Seven-year update from the pivotal Phase 3 CROWN study further supports LORBRENA^® (lorlatinib) as a guideline-recommended first-line treatment for anaplastic lymphoma kinase (ALK)-positive metastatic non-small cell lung cancer (NSCLC).
Late-breaking presentation of progression-free survival (PFS) and overall survival (OS) data from Cohort 3 of the BREAKWATER* trial evaluating BRAFTOVI^® (encorafenib) in combination with cetuximab and FOLFIRI (fluorouracil, leucovorin and irinotecan) as a first-line regimen for patients with BRAF V600E-mutant metastatic colorectal cancer (mCRC). These pivotal data further establish the benefit of this BRAFTOVI regimen following the U.S. Food and Drug Administration (FDA) full approval and the topline results announcement for objective response rate (ORR) from this Cohort earlier this year.

Showcasing data on potential benefit of treatments in earlier lines of therapy for prostate and breast cancers

Late-breaking presentation from the Phase 3 TALAPRO-3 study will highlight clinically meaningful radiographic progression-free survival (rPFS) benefit for TALZENNA^® (talazoparib) plus XTANDI^®** (enzalutamide) in metastatic castration‑sensitive prostate cancer (mCSPC) patients with homologous recombination repair gene alterations, with effects consistent across subgroups and a strong OS trend. These data follow the announcement of topline results in March 2026 and support the potential of TALZENNA plus XTANDI to deliver benefit earlier in the disease course.
Additional efficacy and safety outcomes by stratified subgroups from the Phase 3 HER2CLIMB-05 study investigating TUKYSA^® (tucatinib) in combination with trastuzumab and pertuzumab as first-line maintenance therapy for human epidermal growth factor receptor 2-positive (HER2+) metastatic breast cancer (MBC). These results support TUKYSA's potential use as part of a chemotherapy-free, first-line maintenance strategy for HER2+ MBC.

Advancing next-generation pipeline of novel mechanisms and differentiated combinations across solid tumors

Updated Phase 2 data for PF‑08634404 (PF'4404), a novel bispecific antibody targeting PD-1 and VEGF, as monotherapy in first-line PD-L1-expressing NSCLC. PF'4404 is being developed as a potential backbone therapy across tumor types, including an ongoing Symbiotic-Lung-01 Phase 3 study in combination with chemotherapy in first-line NSCLC regardless of PD-L1 expression and an ongoing Symbiotic-GI-03 Phase 3 study in first-line mCRC.
Updated results from a Phase 1 study of sigvotatug vedotin (SV), a novel integrin β6 (IB6)–directed ADC, in combination with pembrolizumab in NSCLC. These data support the ongoing SigVie-003 Phase 3 study of SV in combination with pembrolizumab in first-line NSCLC. An additional ongoing Phase 3 study, SigVie-002, is evaluating SV monotherapy in patients previously treated for advanced NSCLC.
The first results from a Phase 2 study of neoadjuvant atirmociclib, a highly selective CDK4 inhibitor, in combination with letrozole versus letrozole alone in people with hormone receptor-positive (HR+), HER2- breast cancer. Atirmociclib is being developed as a potential first-in-class, next-generation cell cycle inhibitor backbone for HR+, HER2- breast cancer in the early adjuvant and first-line metastatic setting.
Findings from a Phase 1b study of a brain-penetrant MEK inhibitor, PF-07799544 (polfurmetinib), plus a next-generation BRAF inhibitor, PF-07799933 (claturafenib), in advanced BRAF-mutant melanoma.

Information on significant Pfizer and partner-sponsored abstracts, including date and time of presentation, follows in the chart below. A complete list of Pfizer and partner-sponsored abstracts and presentations is available here.

LUNG CANCER

Oral Presentation (Abstract 8502)

May 29, 2026 1:00 PM-4:00 PM CDT

Lorlatinib vs crizotinib as first-line treatment for advanced ALK+ non-small cell lung cancer: 7-year update from the phase 3 CROWN study

Mok et al

Rapid Oral Presentation (Abstract 8514)

May 30, 2026 1:15 PM-2:45 PM CDT

Updated results from a phase 2 trial of SSGJ-707 (PF-08634404), a PD-1/VEGF bispecific antibody, as monotherapy in patients with advanced non-small cell lung cancer (NSCLC)

Wu et al

Poster Presentation (Abstract 8522)

May 31, 2026 9:00 AM-12:00 PM CDT

Sigvotatug vedotin (SV), an investigational integrin beta-6 (IB6)–directed antibody-drug conjugate (ADC), plus pembrolizumab: updated results from phase 1 study (SGNB6A-001)

Jaime et al

Poster Presentation (Abstract 8609)

May 31, 2026 9:00 AM-12:00 PM CDT

Reduction in circulating tumor DNA (ctDNA) significantly correlates with radiographic response and tumor PD-L1 expression in a phase 1 study of PDL1V (PF-08046054) in patients with non-small cell lung cancer (NSCLC)

Saleh et al

COLORECTAL CANCER

Oral Presentation (Abstract LBA3503)

May 31, 2026 8:00 AM-11:00 AM CDT

BREAKWATER: Progression-free survival analysis of first-line (1L) encorafenib + cetuximab (EC) + FOLFIRI in BRAF V600E-mutant metastatic colorectal cancer (mCRC) [LBA]

Kopetz et al

BREAST CANCER

Oral Presentation (Abstract 1005)

June 2, 2026 9:45 AM-12:45 PM CDT

Efficacy and safety of tucatinib (TUC) vs placebo (PBO) combined with trastuzumab and pertuzumab (HP) as maintenance therapy for HER2+ metastatic breast cancer (MBC) by stratified randomized subgroups

Hamilton et al

Rapid Oral Presentation (Abstract LBA1018)

May 31, 2026 11:30 AM-1:00 PM CDT

Palbociclib plus Tamoxifen ± goserelin in women with hormone receptor (HR)-positive, HER2-negative advanced or metastatic breast cancer (BC): PATHWAY, an Asian international double-blind randomized phase 3 trial: Final Overall Survival (OS) analysis [LBA]

Lu et al

Poster Presentation (Abstract 518)

June 1, 2026 1:30 PM-4:30 PM CDT

Neoadjuvant atirmociclib plus letrozole versus letrozole alone in women with HR+/HER2− breast cancer: results from FOURLIGHT-2, a randomized phase 2 window of opportunity study

Goel et al

Poster Presentation (Abstract 1042)

June 1, 2026 1:30 PM-4:30 PM CDT

Tucatinib (TUC) combined with trastuzumab and pertuzumab (HP) as first-line (1L) maintenance therapy for HER2+ metastatic breast cancer (MBC): an in-depth safety analysis of HER2CLIMB-05

Dieras et al

Poster Presentation (Abstract 1068)

June 1, 2026 1:30 PM-4:30 PM CDT

Long-term safety and adverse event (AE) management in patients with ER+/HER2− metastatic breast cancer (mBC) receiving prifestrastat, a first-in-class KAT6 inhibitor, in combination with fulvestrant

Layman et al

BLADDER/GENITOURINARY CANCERS

Oral Presentation (Abstract LBA5007)

May 30, 2026 3:00 PM-6:00 PM CDT

TALAPRO-3: Talazoparib (TALA) + enzalutamide (ENZA) compared with placebo (PBO) + ENZA for the treatment of patients (pts) with metastatic castration-sensitive prostate cancer (mCSPC) harboring homologous recombination repair (HRR) gene alterations [LBA]

Agarwal et al

Oral Presentation (Abstract 4507)

May 29, 2026 2:45 PM-5:45 PM CDT

Enfortumab vedotin plus pembrolizumab (EV+P) vs chemotherapy for previously untreated locally advanced or metastatic urothelial carcinoma (la/mUC): 3.5-year follow-up and response analyses from the phase 3 EV-302 study

Powles et al

Oral Presentation (Abstract 4510)

May 30, 2026 8:00 AM-9:30 AM CDT

Health-related quality of life (HRQoL) with neoadjuvant and adjuvant (neoadj-adj) enfortumab vedotin (EV) plus pembrolizumab (pembro) in participants (pts) with muscle-invasive bladder cancer (MIBC) who are cisplatin ineligible: phase 3 KEYNOTE-905 study [MSD led]

O'Donnell et al

Oral Presentation (Abstract 5006)

May 30, 2026 3:00 PM-6:00 PM CDT

Final results from ZZFIRST: a randomized phase 2 trial of enzalutamide (EZ) and talazoparib (TALA) in metastatic hormone-naïve prostate cancer (mHNPC)

Mateo et al

Poster Presentation (Abstract 4613)

May 31, 2026 9:00 AM-12:00 PM CDT

Neoadjuvant and adjuvant (neoadj-adj) enfortumab vedotin (EV) plus pembrolizumab (pembro) in participants with cisplatin-ineligible muscle-invasive bladder cancer (MIBC): An analysis of clinically relevant subgroups in KEYNOTE-905 [MSD led]

Adra et al

Poster Presentation (Abstract 5043)

May 31, 2026 9:00 AM-12:00 PM CDT

Impact of baseline demographics on therapy management in patients (pts) with metastatic castration-resistant prostate cancer (mCRPC) treated with talazoparib (TALA) + enzalutamide (ENZA) in the TALAPRO-2 study: extended follow-up

De Giorgi et al

MELANOMA

Rapid Oral Presentation (Abstract 9512)

May 30, 2026 4:30 PM-6:00 PM CDT

Phase 1b study of a brain-penetrant MEK inhibitor, PF-07799544, plus next-generation BRAF dimer inhibitor, PF-07799933, in advanced BRAF-mutant melanoma

Chen et al

MULTIPLE MYELOMA

Oral Presentation (Abstract 7500)

May 29, 2026 2:45 PM-5:45 PM CDT

Safety and efficacy of elranatamab as early intervention in patients with high-risk smoldering myeloma: First results from the phase 2 ERASMM (EMN34) study

Touzeau et al

OTHER GYNECOLOGICAL CANCERS

Poster Presentation (Abstract 5627)

June 1, 2026 9:00 AM-12:00 PM CDT

A phase 2 study evaluating SSGJ-707 (PF-08634404), a PD-1/VEGF bispecific antibody, + chemotherapy (chemo) in patients (pts) with first-line (1L) advanced/recurrent endometrial cancer (EC)

Zhou et al

Pfizer is continuing its commitment to help non-scientists understand the latest findings with the development of abstract plain language summaries (APLS) for company-sponsored research being presented at ASCO, which are written in non-technical language. Those interested in learning more can visit www.Pfizer.com/apls to access the summaries.

*The BREAKWATER trial was conducted with support from ONO Pharmaceutical, Merck KGaA, Darmstadt, Germany and Eli Lilly and Company. Pierre Fabre Laboratories also has exclusive rights to commercialize the product in all other countries, including Europe and Asia (excluding Japan and South Korea).

**XTANDI^® is jointly developed and commercialized by Pfizer and Astellas in the United States.

Prescribing Information for Pfizer Medicines

Please see full Prescribing Information for LORBRENA^®(lorlatinib).

Please see full Prescribing Information for BRAFTOVI^®(encorafenib).

Please see full Prescribing Information for TALZENNA^®(talazoparib).

Please see full Prescribing Information for XTANDI^® (enzalutamide).

Please see full Prescribing Information for TUKYSA^® (tucatinib).

About Pfizer Oncology

At Pfizer Oncology, we are at the forefront of a new era in cancer care. Our industry-leading portfolio and extensive pipeline includes three core mechanisms of action to attack cancer from multiple angles, including small molecules, antibody-drug conjugates (ADCs), and multispecific antibodies, including immune-oncology biologics. We are focused on delivering transformative therapies in some of the world's most common cancers, including breast cancer, gastrointestinal cancer, genitourinary cancer, hematologic malignancies, and lung cancers. Driven by science, we are committed to accelerating breakthroughs to help people with cancer live better and longer lives.

About Pfizer: Breakthroughs That Change Patients' Lives

At Pfizer, we apply science and our global resources to bring therapies to people that extend and significantly improve their lives. We strive to set the standard for quality, safety and value in the discovery, development and manufacture of health care products, including innovative medicines and vaccines. Every day, Pfizer colleagues work across developed and emerging markets to advance wellness, prevention, treatments and cures that challenge the most feared diseases of our time. Consistent with our responsibility as one of the world's premier innovative biopharmaceutical companies, we collaborate with health care providers, governments and local communities to support and expand access to reliable, affordable health care around the world. For 175 years, we have worked to make a difference for all who rely on us. We routinely post information that may be important to investors on our website at www.pfizer.com. In addition, to learn more, please visit us on www.pfizer.com and follow us on X at @Pfizer and @Pfizer_News, LinkedIn, YouTube and like us on Facebook at Facebook.com/Pfizer.

Disclosure Notice

The information contained in this release is as of April 21, 2026. Pfizer assumes no obligation to update forward-looking statements contained in this release as the result of new information or future events or developments.

This release contains forward-looking information about Pfizer Oncology and Pfizer's oncology portfolio of marketed and investigational therapies, including their potential benefits; expectations for our product pipeline, in-line products and product candidates, including anticipated regulatory submissions, data read-outs, study starts, approvals, launches, clinical trial results and other developing data; the development or commercial potential of our product pipeline, in-line products, product candidates and additional indications or combinations, including expected clinical trial protocols, the potential and timing for the initiation and progress of clinical trials and data read-outs from trials; the timing and potential for the submission of applications for and receipt of regulatory approvals; the timing and potential for product launches and commercialization; expected breakthrough, best- or first-in-class or blockbuster status or expected market entry of our medicines; potential patients reached; the regulatory landscape; the competitive landscape; and other statements about our business, operations and financial results that involves substantial risks and uncertainties that could cause actual results to differ materially from those expressed or implied by such statements. Risk and uncertainties include, among other things, uncertainties regarding the commercial success of Pfizer's oncology portfolio; the uncertainties inherent in research and development, including the ability to meet anticipated clinical endpoints, commencement and/or completion dates for our clinical trials, regulatory submission dates, regulatory approval dates and/or launch dates, as well as the possibility of unfavorable new clinical data and further analyses of existing clinical data; risks associated with interim and preliminary data; the risk that clinical trial data are subject to differing interpretations and assessments by regulatory authorities; whether regulatory authorities will be satisfied with the design of and results from our clinical studies; whether and when any drug applications, biologics license applications and/or emergency use authorization applications may be filed in any jurisdictions for any potential indication for Pfizer's product candidates; whether and when any such applications that may be filed for any of Pfizer's product candidates may be approved by regulatory authorities, which will depend on myriad factors, including making a determination as to whether the product's benefits outweigh its known risks and determination of the product's efficacy and, if approved, whether any such product candidates will be commercially successful; decisions by regulatory authorities impacting labeling, manufacturing processes, safety and/or other matters that could affect the availability or commercial potential of Pfizer's products or product candidates, including development of products or therapies by other companies; manufacturing capabilities or capacity; risks and uncertainties related to issued or future executive orders or other new, or changes in, laws or regulations; uncertainties regarding the impact of COVID-19 on Pfizer's business, operations and financial results; and competitive developments.

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Pfizer Showcases Oncology Innovation and Next-Generation Pipeline at ASCO 2026