On May 31, 2025 Mythic Therapeutics, a clinical-stage biotechnology company developing next-generation antibody-drug conjugate (ADC) therapies for the treatment of a wide range of cancers, reported updated data from its Phase 1 KisMET-01 study evaluating its investigational cMET-targeting ADC candidate, MYTX-011, in patients with previously treated, locally advanced or metastatic non-small cell lung cancer (NSCLC), in a poster at the 2025 American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) Annual Meeting (Press release, Mythic Therapeutics, MAY 31, 2025, View Source;utm_medium=rss&utm_campaign=mythic-therapeutics-presents-compelling-efficacy-data-from-its-phase-1-kismet-01-study-supporting-best-in-class-potential-of-novel-cmet-adc-mytx-011-in-non-small-cell-lung-cancer-asco-2025 [SID1234653549]). MYTX-011 is a novel ADC engineered with pH-dependent binding to more precisely deliver anti-tumor payload across a range of cMET expression levels, with the goal of reducing toxicity and expanding the number of patients who can benefit from ADC therapy.

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"We are highly encouraged by these early efficacy data demonstrating meaningful anti-tumor activity which underscore how our differentiated pH-dependent design may help unlock the full promise of ADCs to reshape cancer treatment and expand patient reach, regardless of histology and molecular subtype," said George Eliades, Ph.D., President and Chief Executive Officer at Mythic Therapeutics. "Together with a manageable tolerability profile, these findings support the potential of MYTX-011 to establish a new standard of care for pretreated NSCLC patients in second- and later-line settings, where effective treatment options remain extremely limited. We look forward to evaluating MYTX-011 in Part 2 of the study and plan to present updated expansion cohort data at an upcoming medical conference."

Data presented were from 66 patients treated at efficacious dose levels (≥4.0 mg/kg) administered once every three weeks (Q3W) in Part 1 of the dose escalation portion of the study. Patients had a median of three, and up to 10, prior lines of therapy with nearly half (45%) receiving prior taxane treatments. Preliminary results show:

Anti-tumor activity was consistent regardless of cMET expression levels, EGFR mutation status or prior taxane treatment.
In non-squamous, cMET+ tumors, the ORR was 39% in cMET high/intermediate (n=23) and 36% in cMET low tumors (n=11).
Responses were observed in patients with and without actionable genomic alterations, including a 50% ORR in patients with tumors containing both EGFR mutations and cMET high or intermediate expression.
Overall, responses were durable, with observed durations of up to 8.9 months and ongoing; the majority of patients with responses remain on treatment.
Disease control rate (DCR) was 80% at 12 weeks (n=24 of 30) and 52% at 24 weeks (n=14 of 27).
All four response-evaluable patients with squamous histology tumors and low cMET levels had clinical benefit; one partial response was observed and the three other patients had durable stable disease.
MTYX-011 demonstrated favorable pharmacokinetics (PK) and excellent stability. The overall safety profile of MYTX-011 was consistent with previously reported data, and no new safety signals were identified. The most common treatment-related adverse events (TRAEs) of any grade in 20% or more of patients included, blurred vision (47%), keratopathy (41%), keratitis (32%), nausea (29%), peripheral neuropathy (24%), fatigue (23%), and increased AST (21%). Grade 3 or higher TRAEs in 5% or more of patients included blurred vision (20%), keratopathy (18%), neutropenia (14%), and keratitis (11%). 11 of the 12 reports of neutropenia and 12 of the 16 cases of peripheral neuropathy occurred in patients treated at doses of 5.8 mg/kg or higher. Ocular AEs led to treatment discontinuation in four patients (6%), with three of the four patients receiving doses of 5.8 mg/kg or higher. Based on clinical data and favorable PK, a 5.0 mg/kg dose on a Q3W regimen with a 2-on, 1-off dose break schedule was selected as the recommended Phase 2 dose, which will be compared to a 4.0 mg/kg Q3W dose in Part 2 of the trial.

"The early data from the MYTX-011 study, showing compelling anti-tumor activity and durable responses in patients with lung cancer, together with a well-tolerated safety profile, are highly encouraging," said Rebecca Heist, M.D., MPH, Medical Oncologist, Massachusetts General Hospital, Cancer Center. "These findings suggest that MYTX-011 has the potential to become a promising new treatment option for a broad range of NSCLC patients, and we are eager to continue evaluating its efficacy and safety in the ongoing dose expansion phase of the study."

About KisMET-01

KisMET-01 (NCT05652868) is a multicenter, first-in-human Phase 1 study of MYTX-011 in patients with previously treated, locally advanced or metastatic NSCLC. The study is comprised of two parts: dose escalation (Part 1) in patients with NSCLC of any histology of cMET expression with cMET analyzed whenever tumor tissue is available, followed by dose expansion (Part 2) in cMET-positive (cMET+) patients selected by immunohistochemistry (Ventana SP44). cMET levels are defined as high (≥50% tumor cells with 3+ staining), intermediate (≥25% and <50% with 3+ staining), low (≥25% with 2+ staining, excluding high and intermediate), and ultra-low (≥75% excluding high, intermediate, and low).

About MYTX-011

MYTX-011 is an investigational cMET-targeting ADC, which leverages Mythic’s innovative FateControl technology. FateControl ADCs are pH engineered to unbind their target after internalization, intended to improve both tumor uptake and drug exposure for improved safety, tolerability and efficacy. MYTX-011 is currently being evaluated in the Phase 1 KisMET-01 clinical trial, a first-in-human, open-label, multi-center, dose escalation and dose expansion study enrolling patients with locally advanced, recurrent or metastatic NSCLC (NCT05652868).

On May 31, 2025 Xilio therapeutics presented its corporate presentation (Presentation, Xilio Therapeutics, MAY 31, 2025, View Source [SID1234653628]).

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On May 31, 2025 Regeneron Pharmaceuticals, Inc. (NASDAQ: REGN) reported detailed analyses from the Phase 3 C-POST trial, which evaluated PD-1 inhibitor Libtayo (cemiplimab) in patients with high-risk cutaneous squamous cell carcinoma (CSCC) after surgery (Press release, Regeneron, MAY 31, 2025, View Source [SID1234653550]). The results, shared during an oral session at the 2025 American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) Annual Meeting and simultaneously published in the New England Journal of Medicine (NEJM), include additional data for the primary endpoint of disease-free survival (DFS) and the first presentation of key secondary endpoint outcomes.

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"While surgery and radiotherapy remain the cornerstones of treatment for high-risk cutaneous squamous cell carcinoma, there is a critical unmet need for systemic therapies to help prevent relapse and metastasis to ultimately drive better outcomes for patients," said Danny Rischin, M.D., M.B.B.S., F.R.A.C.P., Research Lead, Head and Neck Cancer and Cutaneous SCC, Department of Medical Oncology at the Peter MacCallum Cancer Centre in Melbourne, Australia, and lead investigator of the trial. "The Phase 3 C-POST trial demonstrates that cemiplimab is a highly active therapy in high-risk CSCC, with clinically meaningful outcomes across primary and secondary endpoints and exceptionally low rates of locoregional and distant recurrence."

Results from the C-POST trial shared earlier this year established Libtayo as the first immunotherapy to show a statistically significant and clinically meaningful benefit in high-risk CSCC in the adjuvant setting. In contrast, negative results with another PD-1 are presented at ASCO (Free ASCO Whitepaper). The data with Libtayo at this year’s ASCO (Free ASCO Whitepaper) provide additional insights for the primary endpoint of DFS – defined as time from randomization to the first documented disease recurrence or death – as well as first results for the secondary endpoints of freedom from locoregional recurrence, freedom from distant recurrence and overall survival (OS).

With a median duration of follow-up of 24 months (range: 2-64 months), efficacy results for Libtayo compared to placebo, were as follows:

68% reduction in the risk of disease recurrence or death (hazard ratio [HR]: 0.32; 95% confidence interval [CI]: 0.20-0.51; p<0.0001), with median DFS not reached for Libtayo-treated patients (versus 49 months for placebo)
At two years, DFS was 87% with Libtayo versus 64% with placebo
80% reduction in the risk of locoregional recurrence (HR: 0.20; 95% CI: 0.09-0.40)
65% reduction in the risk of distant recurrence (HR: 0.35; 95% CI: 0.17-0.72)
Updated OS data from a recent data cut, with approximately six months of additional follow up after the primary analysis for DFS, suggest an emerging OS benefit for Libtayo (HR: 0.78; 95% CI: 0.39-1.56) versus placebo.

"These results show the continued promise of Libtayo in non-melanoma skin cancers," said Israel Lowy, M.D., Ph.D., Clinical Development Unit Head, Oncology, at Regeneron. "Libtayo is the first medicine to demonstrate a statistically significant benefit in patients who have high-risk features for recurrence after resection of cutaneous squamous cell carcinoma and has the potential to become a new standard of care in the adjuvant setting. We are working with global regulatory authorities to bring this new option to patients as quickly as possible."

Additionally, an exploratory analysis of the C-POST results showed similar rates of DFS regardless of PD-L1 expression level. Specifically, Libtayo reduced the risk of disease recurrence or death by 72% in tumors with PD-L1 ≥1% (HR: 0.28; 95% CI: 0.15-0.52; n=309) and by 68% in tumors with PD-L1 <1% (HR: 0.32; 95% CI: 0.12-0.86; n=85), compared to placebo.

Safety was assessed in 205 patients in the Libtayo arm and 204 patients in the placebo arm. Adverse events (AEs) of any grade occurred in 91% and 89% of patients in the Libtayo arm and the placebo arm, respectively. Grade ≥3 AEs occurred in 24% and 14% of patients in the Libtayo arm and the placebo arm, respectively. The most common AEs occurring in at least 10% of patients in the Libtayo arm were fatigue, pruritus, rash, diarrhea, arthralgia, hypothyroidism and maculo-paplar rash. The only grade ≥3 AE that occurred in more than 2% of patients in the Libtayo arm was hypertension. Treatment discontinuations due to AEs, regardless of attribution, occurred in 10% and 2% of patients in the Libtayo arm and the placebo arm, respectively. Two patients experienced an AE leading to death in each arm.

The potential use of Libtayo described above is investigational, and its safety and efficacy has not been evaluated by any regulatory authority for this indication.

Regulatory applications have been submitted for Libtayo in the treatment of adjuvant CSCC in the United States and European Union.

About the Phase 3 Trial
C-POST is one of several trials from Regeneron’s oncology portfolio and pipeline being shared at ASCO (Free ASCO Whitepaper).

C-POST was a randomized, placebo-controlled, double-blind, multicenter, global Phase 3 trial investigating Libtayo versus placebo as adjuvant treatment for patients with features associated with a high-risk of CSCC recurrence and who had completed surgery and post-operative radiation therapy. Trial participants were at high risk of recurrence due to nodal features (extracapsular extension or ≥3 involved lymph nodes) and/or non-nodal features (in-transit metastases, T4 lesion, perineural invasion, or locally recurrent tumor with ≥1 additional poor prognostic features).

The trial enrolled 415 patients who were randomized to receive either Libtayo (n=209) or placebo (n=206) for up to 48 weeks. For the first 12 weeks, Libtayo 350 mg or placebo was administered intravenously every three weeks, followed by Libtayo 700 mg or placebo administered intravenously every six weeks for 36 weeks.

On May 31, 2025 Arvinas, Inc. (Nasdaq: ARVN) and Pfizer Inc. (NYSE: PFE) reported detailed results from the Phase 3 VERITAC-2 clinical trial (NCT05654623) evaluating vepdegestrant monotherapy versus fulvestrant in adults with estrogen receptor-positive, human epidermal growth factor receptor 2-negative (ER+/HER2-) advanced or metastatic breast cancer (MBC) whose disease progressed following prior treatment with cyclin-dependent kinase (CDK) 4/6 inhibitors and endocrine therapy (Press release, Arvinas, MAY 31, 2025, View Source [SID1234653542]). These data, which were highlighted in the American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) press briefing and selected for Best of ASCO (Free ASCO Whitepaper), will be presented today in a late-breaking oral presentation (Abstract LBA1000) and have been simultaneously published in the New England Journal of Medicine.

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In the trial, vepdegestrant demonstrated a statistically significant and clinically meaningful improvement in progression-free survival (PFS) among patients with an estrogen receptor 1 (ESR1) mutation, reducing the risk of disease progression or death by 43% compared to fulvestrant [Hazard Ratio (HR)=0.57 (95% CI 0.42–0.77); 2-sided P<0.001]. The median PFS, as assessed by blinded independent central review (BICR), was 5.0 months with vepdegestrant versus 2.1 months with fulvestrant. Investigator-assessed PFS was consistent with the BICR-assessed PFS. In patients with ESR1 mutations, vepdegestrant demonstrated a consistent PFS benefit over fulvestrant across all pre-specified subgroups. The trial did not reach statistical significance in improvement in PFS in the intent-to-treat (ITT) population, with a median PFS of 3.7 months for vepdegestrant versus 3.6 for fulvestrant [HR=0.83 (95% CI 0.68–1.02); 2-sided P=0.07].

"Many patients with ER+/HER2- metastatic breast cancer who progress on endocrine therapy have tumors with ESR1 mutations, which drive resistance to standard treatments," said Erika P. Hamilton, M.D., Director, Breast Cancer Research, Sarah Cannon Research Institute, and a principal investigator of the VERITAC-2 trial. "The VERITAC-2 results are promising and suggest that vepdegestrant could offer a much-needed treatment option for these patients, with a low incidence of burdensome GI effects that can meaningfully affect daily life."

Vepdegestrant was generally well tolerated in the trial, with a safety profile consistent with what has been observed in previous studies, and mostly low-grade treatment-emergent adverse events (TEAEs). Rates and severity of gastrointestinal adverse events were low with vepdegestrant (nausea, 13.5%; vomiting, 6.4%; diarrhea, 6.4%). Grade 4 TEAEs were reported in 5 patients (1.6%) in the vepdegestrant arm versus 9 patients (2.9%) in the fulvestrant arm. The three most common TEAEs observed with vepdegestrant were fatigue (26.6%), increased alanine transaminase (ALT) (14.4%) and increased aspartate aminotransferase (AST) (14.4%). TEAEs leading to treatment discontinuation occurred in 2.9% of patients taking vepdegestrant versus 0.7% of patients taking fulvestrant.

"Based on these strong data from VERITAC-2, we believe that vepdegestrant has the potential to be a best-in-class monotherapy treatment for patients in the second-line ESR1-mutant setting," said John Houston, Ph.D., Chairperson, Chief Executive Officer and President at Arvinas. "We are excited to engage with regulatory authorities on next steps to potentially bring vepdegestrant to healthcare providers and their patients as swiftly as possible."

Overall survival (OS), the key secondary endpoint in VERITAC-2, was immature at the time of the analysis, with less than a quarter of the required number of events having occurred. Additional secondary endpoints include clinical benefit rate (CBR) and objective response rate (ORR) and duration of response by BICR. In patients with an ESR1 mutation, CBR was 42.1% with vepdegestrant versus 20.2% with fulvestrant [odds ratio 2.88 (95% CI: 1.57–5.39); nominal P<0.001] and ORR was 18.6% with vepdegestrant versus 4.0% with fulvestrant [odds ratio 5.45 (95% CI: 1.69–22.73); nominal P=0.001]. The median duration of response was not reached.

"Patients whose tumors harbor ESR1 mutations can face a poor prognosis, often experiencing rapid disease progression on endocrine therapy," said Johanna Bendell, M.D., Chief Oncology Development Officer, Pfizer. "These results highlight the important role vepdegestrant may play in combating ESR1 mutation treatment resistance for these patients."

Approximately 2.3 million new breast cancer diagnoses were reported globally in 2022, and it is estimated there will be nearly 320,000 new diagnoses in the United States in 2025. ER+/HER2- breast cancer accounts for approximately 70% of all cases. Nearly 30% of women initially diagnosed with early-stage breast cancer will ultimately develop metastatic disease,1 with resistance to current standard-of-care treatments often emerging during first-line therapy, leading to disease progression. ESR1 mutations are a common cause of acquired resistance and are found in approximately 40% of patients in the second-line setting.2,3,4

Vepdegestrant, an investigational oral PROTAC ER degrader for ER+/HER2- breast cancer being jointly developed by Arvinas and Pfizer, is designed to harness the body’s natural protein disposal system to specifically target and degrade the ER. These detailed results follow the March 2025 announcement of the topline results from VERITAC-2. The companies plan to submit a New Drug Application (NDA) for vepdegestrant to the U.S. Food & Drug Administration (FDA) in the second half of 2025.

ASCO Presentation Details
"Vepdegestrant, a PROTAC Estrogen Receptor Degrader, vs Fulvestrant in ER-Positive/Human Epidermal Growth Factor Receptor 2-Negative Advanced Breast Cancer: Results of the Global, Randomized, Phase 3 VERITAC-2 Study" will be presented by Dr. Erika Hamilton, MD, Sarah Cannon Research Institute, in the Oral Abstract Session, Breast Cancer—Metastatic on Saturday, May 31, 1:15 – 4:15 p.m. CDT in Hall B1. Abstract LBA1000.

Investor Call and Webcast Details
Arvinas will host a conference call and webcast on June 2, 2025, at 8:00 a.m. ET to review these data. Participants are invited to listen by going to the Events and Presentation section under the Investors page on the Arvinas website at www.arvinas.com. A replay of the webcast will be available on the Arvinas website following the completion of the event and will be archived for up to 30 days.

About the VERITAC-2 Clinical Trial
The Phase 3 VERITAC-2 clinical trial (NCT05654623) is a global randomized trial evaluating the efficacy and safety of vepdegestrant (ARV-471) as a monotherapy compared to fulvestrant in patients with ER+/HER2- advanced or metastatic breast cancer. The trial enrolled 624 patients at sites in 26 countries who had previously received treatment with a CDK4/6 inhibitor plus endocrine therapy.

Patients were randomized 1:1 to receive either vepdegestrant once daily, orally on a 28-day continuous dosing schedule, or fulvestrant, administered intramuscularly on Days 1 and 15 of Cycle 1 and then on Day 1 of each 28-day cycle starting from Day 1 of Cycle 2. In the trial, 43% of patients (n=270) had ESR1 mutations detected. The primary endpoint was progression-free survival (PFS) in the ESR1-mutation and intent-to-treat populations as determined by blinded independent central review. Overall survival is the key secondary endpoint.

About Vepdegestrant
Vepdegestrant is an investigational, orally bioavailable PROteolysis TArgeting Chimera (PROTAC) protein degrader designed to specifically target and degrade the estrogen receptor (ER) for the treatment of patients with ER-positive (ER+)/human epidermal growth factor receptor 2 (HER2)-negative (ER+/HER2-) breast cancer. Vepdegestrant is being developed as a potential monotherapy for ER+/HER2- advanced or metastatic breast cancer with estrogen receptor 1 (ESR1) mutations in the second line-plus setting.

In July 2021, Arvinas announced a global collaboration with Pfizer for the co-development and co-commercialization of vepdegestrant; Arvinas and Pfizer will share worldwide development costs, commercialization expenses, and profits.

The U.S. Food and Drug Administration (FDA) has granted vepdegestrant Fast Track designation as a monotherapy in the treatment of adults with ER+/HER2- advanced or metastatic breast cancer previously treated with endocrine-based therapy.

On May 31, 2025 Avistone Biotechnology Co., Ltd ("Avistone"), an innovative biotechnology company focused on precision oncology therapeutics, reported that the clinical data for Vebreltinib plus Andamertinib (PLB1004), its innovative combination of potent mesenchymal-epithelial transition factor (MET) inhibitor and epidermal growth factor receptor (EGFR) tyrosine kinase inhibitor (TKI), has been presented at the American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) Annual Meeting 2025 (Press release, Avistone Pharmaceuticals, MAY 31, 2025, View Source [SID1234653575]).

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The details of the poster presentation are provided below:

Poster title: Vebreltinib plus Andamertinib (PLB1004) in EGFR-mutated NSCLC with MET Amplification or Overexpression after failure on EGFR-TKIs treatment: phase Ib/II KYLIN-1 study
Abstract Number For Publication: 8632
Session: Poster Session-Lung Cancer- Non-Small Cell Metastatic
Location: Poster Board, 112
Session Date/Time: 5/31/2025 1:30pm-4:30pm CDT

MET amplification or overexpression is the most common "off-target" mechanism that drives resistance to EGFR-TKIs in NSCLC patients. The results from Phase Ib/II KYLIN-1 study (NCT06343064) showed that Vebreltinib plus Andamertinib demonstrated notable efficacy and manageable safety in EGFR-mutated NSCLC patients with MET amplification or overexpression after EGFR-TKIs failure.

Among the 56 patients enrolled at a dose of Vebreltinib 150mg BID plus Andamertinib 80mg QD (RP2D), the confirmed overall response rate (ORR) was 50.0%, and the median progression-free survival (mPFS) was 9.9 months. In 19 patients with brain metastases, ORR was 42.1% and mPFS was 9.5 months. Grade 3 or higher treatment related adverse events (TRAEs) occurred in 19.6% of the patients. None discontinued treatment or died due to TRAEs. No new safety signal was observed.

A multicenter Phase III study, KYLIN-3 study (NCT06970782), is currently ongoing to further evaluate Vebreltinib plus Andamertinib versus platinum-based doublet chemotherapy in patients with EGFR mutations, MET amplification and/or overexpression, locally advanced or metastatic NSCLC following EGFR-TKI failure.

To obtain a copy of the poster, please email Avistone.

About Vebreltinib

Vebreltinib is an orally, potent and selective c-Met inhibitor. Chinese National Medical Products Administration (NMPA) has formally approved the use of Vebreltinib in locally advanced or metastatic NSCLC patients with MET exon 14 skipping mutations, as well as adult patients with isocitrate dehydrogenase mutant astrocytoma with the PTPRZ1-MET fusion gene or glioblastoma with a history of low-grade disease who have the PTPRZ1-MET fusion gene and have failed previous treatments. Currently, Chinese Center for Drug Evaluation (CDE) has formally accepted its New Drug Application (NDA) and granted it priority review, intended for patients with locally advanced or metastatic NSCLC with MET amplification.

About Andamertinib (PLB1004)

Andamertinib (PLB1004) is an oral, potent, irreversible, and selective EGFR-TKI with potent blood-brain barrier penetration and broad tyrosine kinase activity. Preclinical studies have shown that it can effectively and irreversibly target exon 20 insertion. Additionally, it can also potently target classical EGFR mutations, such as Del19, L858R and T790M with a high degree of selectivity.