On May 5, 2026 Theriva Biologics, Inc. (NYSE American: TOVX), a diversified clinical-stage company developing therapeutics designed to treat cancer and related diseases in areas of high unmet need, reported financial results for the first quarter ended March 31, 2026, and provided a corporate update.

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"The first quarter of 2026 was marked by encouraging regulatory progress," said Steven A. Shallcross, Chief Executive Officer of Theriva Biologics. "We were pleased to receive the minutes from our end-of-Phase 2 meeting with the FDA and align on the major elements of our proposed pivotal Phase 3 trial to evaluate VCN-01 with gemcitabine/nab-paclitaxel standard-of-care (SoC) chemotherapy in patients with metastatic PDAC. The FDA feedback was consistent with the positive scientific advice previously received from the EMA, with both agencies agreeing to repeated dosing ‘macrocycles’ of VCN-01 and SoC chemotherapy. Additional data analyses presented in a poster at the AACR (Free AACR Whitepaper) Annual Meeting in April 2026 concluded that the additional data may reflect a potential immune-mediated mechanism of action for VCN-01 in metastatic PDAC. We believe that repeated macrocycle dosing of VCN-01 and chemotherapy may enhance this immune action, providing increased and more durable tumor responses and longer survival. As we finalize the pivotal Phase 3 study protocol, we plan to generate feasibility data for the intended Phase 3 macrocycle dosing regimen, by conducting a small study in metastatic PDAC patients administering more frequent VCN-01 doses for a longer period. This dosing feasibility study is expected to commence at a single site in Spain in the second half of this year. In parallel with our PDAC program, discussions are ongoing with clinicians and key opinion leaders to design a Phase 2/3 clinical trial protocol for the VCN-01 plus topotecan combination in retinoblastoma patients. We believe that intravitreal coadministration of VCN-01 with topotecan may provide a new treatment option for children with refractory retinoblastoma and vitreous seeds, which remains an unmet medical need in patients with this rare disease. In the first quarter of 2026, we made VCN-01 available to investigators for compassionate use in treating patients with retinoblastoma. We expect that outcomes from these compassionate use patients will provide valuable information on the feasibility and tolerability of this combination for use in a potential Phase 2/3 clinical trial. If a protocol is ultimately submitted to, and agreed by, the FDA, we expect the first patient to be enrolled in December 2026, with rolling Biologic Licensing Application (BLA) submissions expected to be made in 2029 (if successful), targeting potential approval of the BLA prior to September 30, 2029."

Recent Highlights and Anticipated Milestones

VCN-01

Metastatic PDAC:

As recently announced, Theriva received minutes from Type B End-of-Phase 2 (EOP2) meeting with the U.S. Food and Drug Administration (FDA) regarding the design of a Phase 3 clinical study of lead clinical candidate VCN-01 in combination with standard-of-care chemotherapy for the treatment of metastatic PDAC. The FDA provided general agreement with Theriva’s proposed design for a Phase 3 clinical trial, which closely tracks the design of the successful VIRAGE Phase 2 trial. As announced in 2025, the VIRAGE trial met its primary endpoints, with metastatic PDAC patients receiving VCN-01 with SoC chemotherapy having improved overall survival (OS), progression-free survival (PFS) and duration of response (DoR) compared to SoC chemotherapy alone. Greater improvements in OS and PFS were observed in patients who received two doses of VCN-01, leading Theriva to plan the Phase 3 trial to include repeat dosing and an adaptive design aimed to optimize the trial’s timelines and outcomes.
Tumor response, biomarker, and subgroup analyses from the VIRAGE Phase 2b clinical trial were recently presented at the American Association for Cancer Research (AACR) (Free AACR Whitepaper) 2026 annual meeting. The poster concluded that the additional data may reflect an immune-mediated mechanism of action for VCN-01, with later and more durable responses and improved overall survival and progression-free survival in patients treated with VCN-01 plus SoC chemotherapy, compared to SoC chemotherapy alone. Improved overall survival was observed in VCN-01-treated patients across multiple subgroups, including patients with liver metastases.
Retinoblastoma:

Made VCN-01 available to investigators for compassionate use in treating patients with retinoblastoma. Two patients have been treated with intravitreal VCN-01 in combination with intravitreal topotecan and are being followed by the treating physicians.
Continued discussions with clinicians and key opinion leaders to design a Phase 2/3 clinical trial protocol for the VCN-01 plus topotecan combination in retinoblastoma patients.
First Quarter Ended March 31, 2026 Financial Results

General and administrative expenses

General and administrative expenses increased to $2.1 million for the three months ended March 31, 2026, from $1.4 million for the three months ended March 31, 2025. This increase of 43% is primarily comprised of an increase in legal fees, investor relations costs, registration fees, and salary costs. The charge related to stock-based compensation expense was $111,000 for the three months ended March 31, 2026, compared to $54,000 for the three months ended March 31, 2025.

Research and Development Expenses

Research and development expenses decreased to $355,000 for the three months ended March 31, 2026, from approximately $3.0 million for the three months ended March 31, 2025. This decrease of 88% is primarily the result of lower clinical trial expenses related to the completion of our VIRAGE Phase 2b clinical trial of VCN-01 in PDAC, the recognition of the Spanish research and development rebate, lower indirect costs related to compensation and lower clinical trial expenses related to our Phase 1b/2a clinical trial of SYN-004 (ribaxamase) in allogeneic HCT recipients, offset by higher patent expenses related to SYN-020. We anticipate research and development expense to decrease in the near future until we commence additional clinical trials as we focus on regulatory interactions regarding a proposed pivotal clinical trial of VCN-01 in retinoblastoma, continue with VCN-01 manufacturing scale-up activities, commence a proposed Phase 2a study in metastatic PDAC patients evaluating VCN-01 dosing frequency and continue limited preclinical studies supporting VCN-01 and VCN-12, the first candidate from our VCN-X discovery program. The charge related to stock-based compensation expense was $24,000 for the three months ended March 31, 2026, compared to $46,000 for the three months ended March 31, 2025.

Other Income/Expense

Other income was $83,000 for the three months ended March 31, 2026 compared to other income of $93,000 for the three months ended March 31, 2025. Other income for the three months ended March 31, 2026 is comprised of interest income of $82,000 and an exchange gain of $1,000. Other income for the three months ended March 31, 2025 is comprised of interest income of $96,000 and an exchange loss of $3,000.

Cash and cash equivalents

Cash and cash equivalents totaled $14.4 million as of March 31, 2026, an increase of $1.4 million from December 31, 2025. During the year ended December 31, 2025 and the quarter ended March 31, 2026, the primary use of cash was for working capital requirements and operating activities, which resulted in a net loss of $23.7 million and $2.0 million for the year ended December 31, 2025 and the quarter ended March 31, 2026, respectively.

(Press release, Theriva Biologics, MAY 5, 2026, View Source [SID1234665143])

On May 5, 2026 Allarity Therapeutics, Inc. ("Allarity" or the "Company") (NASDAQ: ALLR), a Phase 2 clinical-stage pharmaceutical company dedicated to developing stenoparib (2X-121)—a differentiated, dual PARP and WNT pathway inhibitor, reported that its active pharmaceutical ingredient (API) manufacturing campaign for stenoparib is progressing in line with the planned timeline for completion no later than the third quarter of 2026 at its world-class contract development and manufacturing organization (CDMO).

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This milestone represents a key operational advance as the Company works to secure robust drug supply while preparing for potential pivotal-stage clinical development. The decision to move forward with the campaign reflects the continuously growing confidence in stenoparib’s therapeutic potential, based on previously reported data showing extended overall survival in advanced, platinum-resistant ovarian cancer patients.

"With the Phase 3 manufacturing campaign of stenoparib approaching completion, we are taking an important step to ensuring timely advancement into potential pivotal-stage clinical trials," said Thomas Jensen, Chief Executive Officer of Allarity Therapeutics. "This campaign reflects our confidence in the long-term potential of the program, and is particularly important as we work to leverage the FDA Fast Track designation to accelerate the development and potential approval of stenoparib."

The CDMO site, located in Europe, operates in full compliance with GMP (Good Manufacturing Practice) standards set by both the U.S. Food and Drug Administration (FDA) and the European Medicines Agency (EMA). Drug manufacturing for late-stage clinical development requires heightened manufacturing standards that go above and beyond the standards necessary for phase 1 and phase 2 clinical development. Triggering this campaign now ensures that the higher standard API is ready when the company is ready to advance a pivotal trial for FDA approval.

From a financial standpoint, the company has completed all payments for the manufacturing and no additional cash outlays for manufacturing are anticipated.

The manufacturing campaign is expected to be completed well in advance of the anticipated generation of critical data from Allarity’s ongoing Phase 2 trial in advanced ovarian cancer. The ongoing phase 2 trial continues to enroll patients under the new protocol, generating enthusiastic investigator engagement.

About Stenoparib/2X-121
Stenoparib is an orally available, small-molecule dual-targeted inhibitor of PARP1/2 and tankyrase 1/2. At present, tankyrases are attracting significant attention as emerging therapeutic targets for cancer, principally due to their role in regulating the WNT signaling pathway. Aberrant WNT/β-catenin signaling has been implicated in the development and progression of numerous cancers. By inhibiting PARP and blocking WNT pathway activation, stenoparib’s unique therapeutic action shows potential as a promising therapeutic for many cancer types, including ovarian cancer, Small Cell Lung Cancer and colorectal cancer. Allarity has secured exclusive global rights for the development and commercialization of stenoparib, which was originally developed by Eisai Co. Ltd. and was formerly known under the names E7449 and 2X-121. Allarity has two ongoing Phase 2 trial protocols for stenoparib in Ovarian Cancer patients. In the first, patients who had had 2+ lines of therapy were enrolled on stenoparib and given drug twice daily. This protocol has been closed to further enrollment but continues for the enrolled patients who are still receiving benefit from stenoparib administration. The updated data from this study were presented at the AACR (Free AACR Whitepaper) special conference on advances in Ovarian Cancer in September 2025. Note that, as these data are from an ongoing trial, analyses may change as the study fully matures. An amended protocol designed expressly to capitalize on the emerging clinical experience with stenoparib in platinum resistant patients began enrolling patients in the summer of 2025. This amended protocol enrolls only platinum resistant or platinum-ineligible patients and is designed to accelerate the clinical development of stenoparib toward FDA approval. In parallel, a separate Phase 2 trial evaluating stenoparib in combination with temozolomide for relapsed small cell lung cancer (SCLC) began enrolling patients in early 2026 and is currently enrolling patients across multiple U.S. Veterans Administration (VA) sites.

About the Drug Response Predictor – DRP Companion Diagnostic
Allarity uses its drug-specific DRP to select those patients who, by the gene expression signature of their cancer, may have a high likelihood of benefiting from a specific drug. By screening patients before treatment, and only treating those patients with a sufficiently high, drug-specific DRP score, the therapeutic benefit rate may be enhanced. The DRP method builds on the comparison of sensitive vs. resistant human cancer cell lines, including transcriptomic information from cell lines, combined with clinical tumor biology filters and prior clinical trial outcomes. DRP is based on messenger RNA expression profiles from patient biopsies. The DRP platform has shown an ability to provide a statistically significant prediction of the clinical outcome from drug treatment in cancer patients across dozens of clinical studies (both retrospective and prospective). The DRP platform, which may be useful in all cancer types and is patented for dozens of anti-cancer drugs, has been extensively published in the peer-reviewed literature.

(Press release, Allarity Therapeutics, MAY 5, 2026, View Source [SID1234665142])

On May 5, 2026 Ultragenyx Pharmaceutical Inc. (NASDAQ: RARE), a biopharmaceutical company focused on the development and commercialization of novel therapies for serious rare and ultra-rare genetic diseases, reported its financial results for the quarter ended March 31, 2026 and reaffirmed its financial guidance for 2026.

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"This is an important year for Ultragenyx with two BLAs under review and our Angelman Phase 3 readout coming soon. We have the opportunity to meaningfully accelerate our consistent commercial revenue growth over the last few years as we prepare for two potential gene therapy approvals and launches in two urgent diseases without any approved therapies," said Emil D. Kakkis, M.D., Ph.D., chief executive officer and president of Ultragenyx. "The latest long-term GTX-102 Phase 1/2 data further support the potential of the program, as it heads toward Phase 3 results later this year."

First Quarter 2026 Revenue Highlights and 2026 Revenue Guidance

Total revenue in the first quarter of 2026 was $136 million. The company reaffirms its full year 2026 total revenue guidance of $730 million to $760 million, which excludes revenue from potential new product launches.
Crysvita revenue in the first quarter of 2026 was $93 million, consistent with expected seasonality in the U.S. and Canada and ordering patterns in Brazil. The company reaffirms its full year 2026 Crysvita revenue guidance of $500 million to $520 million.
Dojolvi revenue in the first quarter 2026 was $18 million. The company reaffirms its full year 2026 Dojolvi revenue guidance of $100 million to $110 million.
Evkeeza revenue in the first quarter 2026 was $18 million, driven by increased demand from new country launches and early access.
Mepsevii revenue in the first quarter 2026 was $7 million.
Recent Clinical Milestones and 2026 Catalysts

GTX-102 (apazunersen) antisense oligonucleotide (ASO) for the treatment of Angelman syndrome (AS): As of a March 2026 Phase 1/2 data cut-off date, a total of 74 patients had been treated with GTX-102, with 66 patients continuing in the long-term extension (LTE) study. Phase 1/2 patients have been on continuous treatment for an average of more than three years, with some patients now in their fifth year, generally receiving the 14 mg quarterly maintenance dose. Patients have continued to show positive improvements across multiple domains and continued to gain ground developmentally. GTX-102 has maintained a consistent safety profile, sustained over multiple years of chronic treatment, while demonstrating no new cases of transient lower extremity weakness nor any other recurring drug-related serious adverse events. These updated efficacy and safety data are planned to be presented at a future scientific meeting.

The Phase 3 Aspire study, in patients with a full maternal UBE3A gene deletion, enrolled 129 patients, randomized 1:1 to GTX-102 or sham. Data from this study are expected in the second half of 2026.

Enrollment in the open-label Phase 2/3 Aurora study, evaluating GTX-102 in other genotypes and ages, began enrollment in October 2025 and is expected to complete enrollment in the second half of 2026.
DTX401 (pariglasgene brecaparvovec) AAV8 gene therapy for the treatment of glycogen storage disease type Ia (GSDIa): In February 2026, the U.S. Food and Drug Administration (FDA) accepted for review the Biologics License Application (BLA) seeking approval of DTX401 as a treatment for GSDIa, granted the BLA Priority Review, and assigned a Prescription Drug User Fee Act (PDUFA) action date of August 23, 2026. The FDA also recently informed the company that an Advisory Committee meeting is not anticipated at this time.

UX111 (rebisufligene etisparvovec) AAV9 gene therapy for the treatment of Sanfilippo syndrome type A (MPS IIIA): In April 2026, the FDA accepted for review the resubmitted BLA seeking accelerated approval for UX111 as a treatment for MPS IIIA. The resubmitted BLA included substantial longer-term data that were presented in February at the WORLDSymposium 2026 and included up to eight years of follow-up. These data demonstrated further clinical improvement relative to the decline observed in natural history studies, and showed a durable treatment effect across clinical evaluations and multiple biomarkers, while maintaining an acceptable safety profile. In February 2025, the FDA granted the BLA Priority Review and, in April 2026, assigned a PDUFA action date of September 19, 2026.

DTX301 (avalotcagene ontaparvovec) AAV8 gene therapy for the treatment of Ornithine Transcarbamylase, or OTC, deficiency: As announced in March 2026, at Week 36 in the randomized, double-blind placebo-controlled period of the Phase 3 study, DTX301 patients (n=18) demonstrated a statistically significant and clinically meaningful 18% (p=0.018) reduction in 24-hour plasma ammonia (AUC0-24) into the normal range compared to placebo (n=19). Eight of nine patients with abnormal ammonia AUC0-24 at baseline also reached normal ammonia levels rapidly, which were generally maintained during this treatment period. At Week 24, patient global impression scale (PGIC) for overall OTC symptoms (n=15) showed 71% of DTX301 patients were much improved (equivalent to +3), compared to 0% of placebo patients. DTX301 was well tolerated with an acceptable safety profile.

Per the protocol, the study is continuing to its second primary endpoint, which evaluates reduction in treatment burden, including use of ammonia scavengers and dietary management, across both the treatment and placebo-crossover groups following treatment with DTX301 through 64 weeks of follow-up. Data are expected in the first half of 2027.
UX701 (rivunatpagene miziparvovec) AAV9 gene therapy for the treatment of Wilson disease: Enrollment is complete for the fourth cohort in the ongoing, dose-finding stage of the pivotal Cyprus2+ study. Data from this stage are expected in 2026.

UX016 novel prodrug for sialic acid used as a substrate replacement therapy for the treatment of GNE myopathy: The FDA cleared the Investigational New Drug (IND) application for UX016 and an externally funded Phase 1/2 study is expected to begin in the second half of 2026.
Summary of First Quarter 2026 Financial Results

Selected Financial Data (dollars in millions, except per share amounts), (unaudited)
Three Months Ended March 31,
2026 2025
Total revenues $ 136 $ 139
Operating expenses:
Cost of sales 30 29
Research and development 187 166
Selling, general and administrative 88 87
Total operating expenses 305 282
Net loss $ (185 ) $ (151 )
Net loss per share, basic and diluted $ (1.84 ) $ (1.57 )

Operating Expenses

Total operating expenses for the first quarter 2026 were $305 million, including $30 million of non-cash stock-based compensation and $30 million of expense related to the restructuring announced last quarter. The company reaffirms its full year 2026 and 2027 guidance for combined R&D and SG&A operating expenses: compared to 2025, combined R&D and SG&A expenses in 2026 are expected to be flat to down low-single digits, and combined R&D and SG&A expenses in 2027 are expected to decrease by at least 15%.

Net Loss

Net loss for the first quarter 2026 was $185 million, or $1.84 per share basic and diluted, compared with a net loss for the first quarter 2025 of $151 million, or $1.57 per share basic and diluted.

Cash Balance and Net Cash Used in Operations

Cash, cash equivalents, and marketable securities were $534 million as of March 31, 2026. For the three months ended March 31, 2026, net cash used in operations was $197 million and includes the payment of annual bonuses and $38 million of payments related to UX143 manufacturing activities.

Conference Call and Webcast Information

Ultragenyx will host a conference call today, Tuesday, May 5, 2026, at 2 p.m. PT/5 p.m. ET to discuss the first quarter financial results and provide a corporate update. The live and replayed webcast of the call will be available through the company’s website at View Source The replay of the call will be available for three months.

(Press release, Ultragenyx Pharmaceutical, MAY 5, 2026, View Source [SID1234665141])

On May 5, 2026 Relay Therapeutics, Inc. (Nasdaq: RLAY), a clinical-stage, small molecule precision medicine company developing potentially life-changing therapies for patients living with cancer and genetic disease, reported first quarter 2026 financial results and corporate updates.

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"We have made important progress so far in 2026, highlighted by promising data supporting further development for the zovegalisib plus atirmociclib triplet combination in frontline breast cancer," said Sanjiv Patel, M.D., President and Chief Executive Officer of Relay Therapeutics. "With initial clinical data in vascular anomalies expected at ISSVA and preparations underway for our planned Phase 3 frontline study in endocrine-sensitive patients with metastatic breast cancer, we are entering a data-rich period for zovegalisib. Additionally, RLY-8161, our NRAS-selective molecule, has entered clinical development for patients with NRAS-mutant solid tumors. We remain focused on executing across these priorities to bring differentiated therapies to patients."

Corporate Highlights

2L Breast Cancer

•
U.S. Food and Drug Administration (FDA) granted Breakthrough Therapy designation (BTD) to zovegalisib in combination with fulvestrant for PIK3CA-mutant, HR+/HER2- advanced breast cancer
o
Designation supported by robust clinical data from the Phase 1/2 ReDiscover trial of 600mg twice daily (BID) fasted and 400mg BID fed regimens of zovegalisib in combination with fulvestrant
•
Presented 400mg BID zovegalisib doublet data at the European Society for Medical Oncology (ESMO) (Free ESMO Whitepaper) Targeted Anticancer Therapies (TAT) Congress 2026

o
11.1-month median progression-free survival (PFS) observed in heavily pre-treated patients with PI3Kα-mutated, HR+/HER2- metastatic breast cancer, consistent with previously reported data
o
Efficacy in patients with kinase and non-kinase domain mutations was similar, with median PFS of 11.2 and 11.0 months, respectively
o
Safety and tolerability data were consistent with previously reported 600mg BID fasted data
•
Relay Tx continues to execute on the Phase 3 ReDiscover-2 trial of zovegalisib + fulvestrant in PI3Kα-mutated, CDK4/6 pre-treated, HR+/HER2- advanced breast cancer
1L Breast Cancer

•
Announced clinical data for zovegalisib plus atirmociclib triplet combination, plans for frontline breast cancer study, and clinical supply agreement with Pfizer
o
Compelling efficacy and tolerability data presented for zovegalisib triplet in median third-line (3L) patients with PI3Kα-mutated, HR+/HER2- metastatic breast cancer
o
44% objective response rate (ORR) reported in heavily pre-treated CDK4/6-experienced patients (median 3L) at unoptimized doses and ORR was similar across kinase and non-kinase PIK3CA mutations
o
Adverse events were consistent with those previously reported by each molecule
o
Phase 3 1L trial in patients with endocrine-sensitive breast cancer expected to initiate in early 2027, subject to regulatory feedback
▪
Pfizer has agreed to supply atirmociclib for the experimental arm and the palbociclib portion of the control arm for use in the planned study, and Relay Tx will retain full global rights for zovegalisib
•
Relay Tx continues to execute the Phase 1/2 ReDiscover trial, advancing the ongoing triplet cohorts with zovegalisib + atirmociclib + endocrine therapy
Vascular Anomalies

•
Corporate conference call planned for May 19 at 8:00am ET during the International Society for the Study of Vascular Anomalies (ISSVA) World Congress 2026 to announce initial clinical results for zovegalisib in vascular anomalies
o
Late breaking abstract for clinical data to be presented May 20 from 4:45pm-4:49pm ET
o
Pre-clinical data presentation May 22 at 11:10am ET
o
Conference call details to be shared at a later date
•
Continued execution of the Phase 1/2 ReInspire trial, evaluating zovegalisib in PIK3CA-driven vascular anomalies
NRAS Selective Inhibitor: RLY-8161

•
Initiated Phase 1/2 clinical trial for RLY-8161, a NRAS-selective inhibitor, in patients with NRAS-mutant melanoma and other NRAS-mutant solid tumors

First Quarter 2026 Financial Results

Cash, Cash Equivalents and Investments: As of March 31, 2026, cash, cash equivalents and investments totaled $642.1 million, as compared to $554.5 million as of December 31, 2025. The increase in cash was due to $137.1 million in net proceeds from "at-the-market" offerings under our sales agreement with TD Securities (USA) LLC during the quarter. This figure does not include an additional $22.1 million in net proceeds received from "at-the-market" offerings in April. The company expects its current cash, cash equivalents, and investments will be sufficient to fund its operating expenses and capital expenditure requirements into 2029.

Revenue: Revenue was $3.0 million for the first quarter of 2026, as compared to $7.7 million for the first quarter of 2025. The revenue recognized in each period was under the company’s Exclusive License Agreement with Elevar Therapeutics, Inc.

R&D Expenses: Research and development expenses were $70.6 million for the first quarter of 2026, as compared to $73.8 million for the first quarter of 2025. The decrease was primarily due to the series of strategic choices made to streamline the research organization prior to 2026, offset by increases in costs related to the ReDiscover-2 trial.

G&A Expenses: General and administrative expenses were $11.0 million for the first quarter of 2026, as compared to $18.7 million for the first quarter of 2025. The decrease was primarily due to decreases in employee compensation costs, including stock compensation expense, and costs to obtain the Exclusive License Agreement with Elevar Therapeutics, Inc., which were expensed during the three months ended March 31, 2025.

Net Loss: Net loss was $73.3 million for the first quarter of 2026, or a net loss per share of $0.41, as compared to a net loss of $77.1 million for the first quarter of 2025, or a net loss per share of $0.46.

About Zovegalisib

Zovegalisib is the lead program in Relay Therapeutics’ efforts to discover and develop mutant-selective inhibitors of PI3Kα, the most frequently mutated kinase in all cancers and all vascular anomalies. Zovegalisib has the potential, if approved, to address a significant portion of the approximately 140,000 patients with HR+/HER2- breast cancer with a PI3Kα mutation and the estimated 170,000 patients with vascular anomalies driven by a PI3Kα mutation per year in the United States, one of the largest patient populations for a precision medicine.

Traditionally, the development of PI3Kα inhibitors has focused on the active, or orthosteric, site. The therapeutic index of orthosteric inhibitors is limited by the lack of clinically meaningful selectivity for mutant versus wild-type (WT) PI3Kα and off-isoform activity. Toxicity related to inhibition of WT PI3Kα and other PI3K isoforms results in sub-optimal inhibition of mutant PI3Kα with reductions in dose intensity and frequent discontinuation. The Dynamo platform enabled the discovery of zovegalisib, the first known allosteric, pan-mutant, and isoform-selective PI3Kα inhibitor, designed to overcome these limitations. Relay Therapeutics solved the full-length cryo-EM structure of PI3Kα, performed computational long time-scale molecular dynamic simulations to elucidate conformational differences between WT and mutant PI3Kα, and leveraged these insights to support the design of zovegalisib. Zovegalisib is currently being evaluated in multiple metastatic breast cancer studies and a Phase 1/2 study designed to treat patients with PIK3CA (PI3Kα) mutation driven vascular anomalies.

(Press release, Relay Therapeutics, MAY 5, 2026, View Source [SID1234665140])

On May 5, 2026 Zentalis Pharmaceuticals, Inc. (Nasdaq: ZNTL), a clinical oncology innovator advancing late-stage development of investigational first-in-class WEE1 inhibitor azenosertib as a biomarker-driven treatment approach for ovarian cancer, reported that the first patient has been dosed in the Phase 3 ASPENOVA clinical trial (NCT07546500, GOG-3147, ENGOT-ov109, APGOT-OV27) evaluating azenosertib in patients with Cyclin E1-positive platinum-resistant ovarian cancer (PROC).

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"Dosing the first patient in the ASPENOVA Phase 3 clinical trial represents a significant milestone in our development of azenosertib for patients with platinum-resistant ovarian cancer," said Ingmar Bruns, M.D., Chief Medical Officer of Zentalis. "With DENALI Part 2 progressing toward a year-end readout that may support accelerated approval and ASPENOVA now enrolling to evaluate azenosertib versus standard-of-care chemotherapy to support full approval, we are executing on a comprehensive development and regulatory strategy designed to bring this therapy to patients as quickly as possible. We are deeply grateful to the patients participating in this important trial and to our collaborators at The GOG Foundation, Inc. (GOG-F), ENGOT, and APGOT for their partnership in advancing this research."

"Cyclin E1-overexpressing ovarian cancers are associated with platinum-resistance and poor outcomes, representing a clinical unmet need," said Fiona Simpkins, M.D., Professor at the University of Pennsylvania Perelman School of Medicine and Lead Investigator for the ASPENOVA trial and GOG-F. "This biomarker has yet to be exploited therapeutically and azenosertib, a WEE1 inhibitor, is an oral, targeted treatment that is showing exciting activity in Cyclin E1-overexpressing ovarian cancer (SGO Annual Meeting, 2025). The biomarker-driven approach now being studied in this Phase 3 randomized trial has the potential to identify patients most likely to benefit while sparing them from the inconvenience of intravenous regimens. On behalf of GOG Foundation, we are pleased to collaborate with Zentalis, ENGOT, and APGOT on this important trial for this underserved patient population."

ASPENOVA is a randomized, controlled Phase 3 trial designed to confirm the clinical benefit of azenosertib and support full approval as part of Zentalis’ dual-track regulatory strategy. The company is pursuing accelerated approval based on the ongoing registration-intended DENALI Phase 2 trial, with a topline readout expected by year-end 2026, while simultaneously advancing ASPENOVA as the confirmatory study to satisfy FDA requirements for conversion to full approval. Both trials are evaluating azenosertib at 400mg once daily on a 5-days-on, 2-days-off schedule (400mg QD 5:2), the dose selected based on the DENALI Part 2a interim analysis announced in April 2026. The planned interim analysis showed a meaningful, clearly differentiated response rate at 400mg QD 5:2 over 300mg QD 5:2 and comparable safety profiles between the two dose groups.

The ASPENOVA trial is being conducted in collaboration with The GOG Foundation, Inc. (GOG-F), the European Network of Gynaecological Oncological Trial groups (ENGOT), and Asia-Pacific Gynecologic Oncology Trials Group (APGOT), reflecting the global clinical and scientific community’s recognition of the significant unmet need in this patient population.

About ASPENOVA Clinical Trial
ASPENOVA (NCT07546500, GOG-3147, ENGOT-ov109) is a Phase 3 randomized, confirmatory clinical trial designed to support full approval of azenosertib in patients with Cyclin E1-positive platinum-resistant ovarian cancer (PROC). The trial is expected to enroll approximately 420 patients and compare azenosertib monotherapy at 400mg QD 5:2 to investigator’s choice of standard-of-care single-agent chemotherapy (paclitaxel, pegylated liposomal doxorubicin [PLD], gemcitabine, or topotecan) in this biomarker-selected population. The primary endpoint is progression-free survival (PFS); key secondary endpoints include overall survival (OS) and overall response rate (ORR). The trial design was aligned with the U.S. Food and Drug Administration (FDA) to meet requirements for the accelerated approval pathway and potential conversion to full approval.

About DENALI Clinical Trial
DENALI is a multi-part Phase 2 registration-intended clinical trial (NCT05128825) studying azenosertib in PROC patients.

Part 1b enrolled patients with PROC regardless of Cyclin E1 protein expression, all treated at 400mg QD 5:2. Part 2 is prospectively enrolling PROC patients with Cyclin E1 protein overexpression based on Zentalis’ proprietary immunohistochemistry cutoff.

Part 2, in total, is designed to support accelerated approval, pending study outcome and discussions with the FDA. The study design consists of the following parts:
•Part 2a: Dose confirmation evaluated two doses, 300mg QD 5:2 and 400mg QD 5:2, with approximately 30 patients enrolled per dose group. 400mg QD 5:2 was selected as the optimal monotherapy dose. Recruitment at the 300mg QD 5:2 dose level has been discontinued. All patients enrolled in Part 2a will contribute to the overall safety database submitted to the FDA.
•Part 2b: Enrollment expansion at the selected 400mg QD 5:2 dose up to approximately 100 patients, including patients at this dose in Part 2a. This cohort is currently enrolling.
•Part 2c: Broadening study population to include approximately 40 patients previously treated with a taxane-containing regimen for PROC. This cohort is currently enrolling.

Zentalis expects to complete enrollment in all cohorts of DENALI Part 2 (2a, 2b, 2c) and provide a topline readout by year-end 2026.

For physician and patient information about the DENALI trial, please visit www.denalitrial.com.

About Azenosertib
Azenosertib is an investigational, potentially first-in-class, selective, and orally bioavailable inhibitor of WEE1 currently being evaluated in clinical studies in ovarian cancer and additional tumor types. WEE1 acts as a master regulator of the G1-S and G2-M cell cycle checkpoints, through negative regulation of both CDK1 and CDK2, to prevent replication of cells with damaged DNA. By inhibiting WEE1, azenosertib enables cell cycle progression, despite high levels of DNA damage, thereby resulting in the accumulation of DNA damage and leading to mitotic catastrophe and cancer cell death.
Azenosertib is in late-stage development as a potential treatment for Cyclin E1-positive platinum-resistant ovarian cancer (PROC). There is currently no approved treatment option specifically for this biomarker-selected population which comprises approximately 50% of PROC patients. Cyclin E1 protein overexpression has been established as a sensitive and specific predictive biomarker for identifying patients who could potentially derive benefit from azenosertib treatment, based on retrospective analysis of azenosertib studies in PROC. Validation of the Cyclin E1 companion diagnostic assay is ongoing in the DENALI and ASPENOVA trials.
Azenosertib has been granted Fast Track Designation by the U.S. FDA for the treatment of patients with Cyclin E1-positive platinum-resistant ovarian cancer. Fast Track Designation is intended to facilitate the development and expedite the review of therapies that have the potential to treat serious conditions and address unmet medical needs.

(Press release, Zentalis Pharmaceuticals, MAY 5, 2026, View Source [SID1234665135])