On April 26, 2025 UroGen Pharma Ltd. (Nasdaq: URGN), a biotech company dedicated to developing and commercializing innovative solutions that treat urothelial and specialty cancers, reported encouraging safety data from the Phase 1 dose-escalation study for UGN-301 (zalifrelimab) intravesical solution, an investigational drug in development for the treatment of recurrent non-muscle invasive bladder cancer (NMIBC) (Press release, UroGen Pharma, APR 26, 2025, View Source [SID1234652194]).

Schedule your 30 min Free 1stOncology Demo!
Discover why more than 1,500 members use 1stOncology™ to excel in:

Early/Late Stage Pipeline Development - Target Scouting - Clinical Biomarkers - Indication Selection & Expansion - BD&L Contacts - Conference Reports - Combinatorial Drug Settings - Companion Diagnostics - Drug Repositioning - First-in-class Analysis - Competitive Analysis - Deals & Licensing

                  Schedule Your 30 min Free Demo!

"The early safety profile and clinical activity results from this study are encouraging," said Jay Raman, M.D., Professor and Chair of Urology, and Professor of Surgery, Penn State Cancer Institute, PA. "This innovative approach of localized drug delivery combined with immune modulation merits additional investigation in the treatment of non-muscle invasive bladder cancer."

The multi-part clinical study included up to 30 patients per arm, aimed to assess safety and determine the recommended Phase 2 dose of UGN-301 as monotherapy and in combination with other agents. In the monotherapy arm, dose escalation continued to the maximum feasible dose. No dose-limiting toxicities and no treatment-emergent adverse events leading to treatment discontinuation were observed. This study also demonstrated that local delivery of UGN-301 formulated in our proprietary reverse thermal gel (RTGel) allowed sustained exposure of zalifrelimab in the bladder with limited systemic exposure, which mitigated the risk of systemic immune-related toxicities associated with CTLA-4 inhibition.

With respect to clinical activity observed in the trial, among evaluable patients who received UGN-301, 46% (6 of 13) of those with Ta/T1 disease and 33% (2 of 6) of those with carcinoma in situ (CIS) ± Ta/T1 disease were recurrence-free or had achieved a complete response at week 12. Notably, 60% (3 of 5) of patients with Ta/T1 disease treated with 300 mg continued to remain recurrence-free at the 15-month disease assessment, including one patient with high-grade T1 disease. In the 500 mg cohort, 25% (1 of 4) of patients with CIS disease and 33% (1 of 3) of patients with Ta/T1 disease remained disease-free at six months, both of whom are still active participants in the study.

These findings highlight the potential of UGN-301 as a targeted treatment for NMIBC with an acceptable safety profile. Presentation of data from the combination arms is planned for later this year.

"Our hypothesis is that UGN-301’s unique formulation could potentially offer the dual benefits of maximizing therapeutic activity while minimizing systemic side effects, a key challenge in cancer immunotherapy," said Mark Schoenberg, Chief Medical Officer, UroGen. "Although this requires additional clinical investigation, we are encouraged by the potential of UGN-301 as an investigational treatment for patients with recurrent NMIBC."

About Non-Muscle Invasive Bladder Cancer and High-Grade Disease

In the U.S., bladder cancer is the second most common urologic cancer in men. Bladder cancer primarily affects older populations with increased risk of comorbidities, with the median age of diagnosis being 73 years. High-grade non-muscle invasive bladder cancer (HG-NMIBC) is a serious and potentially life-threatening form of bladder cancer that remains confined to the inner layers of the bladder wall but exhibits aggressive behavior and a higher risk of progression. In the U.S., HG-NMIBC accounts for approximately 30–40% of all newly diagnosed NMIBC cases. Patients with HG-NMIBC face a significantly elevated risk of recurrence and progression to muscle-invasive disease, necessitating close surveillance and aggressive treatment. The standard of care includes complete transurethral resection of bladder tumor, often followed by intravesical therapy such as Bacillus Calmette-Guérin (BCG). However, BCG has a treatment failure rate of approximately 40-50%, leaving patients with limited treatment options short of radical cystectomy. Given the high recurrence and progression rates, HG-NMIBC presents a substantial clinical and quality-of-life burden. Upon recurrence, which occurs in approximately 70% of patients, the patients undergo another round of BCG therapy with a response rate of approximately 30%.

About UGN-301

UGN-301 is an anti-CTLA-4 monoclonal antibody (zalifrelimab), originally licensed from Agenus Inc. in 2019. It is formulated with RTGel, our proprietary reverse-thermal hydrogel, for intravesical administration into the bladder. Intravesical administration of UGN-301 is designed to increase drug concentrations in the bladder without significant systemic exposure, potentially diminishing the systemic toxicity associated with CTLA-4 blockade. UroGen is evaluating UGN-301 in a multi-arm Phase 1 study of UGN-301 as monotherapy and in combination with other agents. The safety of UGN-301 is being evaluated in the monotherapy arm of the study as combination therapy for HG-NMIBC.

On April 26, 2025 UroGen Pharma Ltd. (Nasdaq: URGN), a biotech company dedicated to developing and commercializing innovative solutions that treat urothelial and specialty cancers, reported an updated 18-month DOR of 80.6% (95% CI: 74.0, 85.7), by Kaplan-Meier estimate, from the Phase 3 ENVISION trial of UGN-102 (mitomycin) for intravesical solution, an investigational treatment for recurrent LG-IR-NMIBC (Press release, UroGen Pharma, APR 26, 2025, View Source [SID1234652195]). These data were featured today in an Oral Presentation Session (Abstract ID: PD12) at the AUA 2025 Annual Meeting in Las Vegas, Nevada.

Schedule your 30 min Free 1stOncology Demo!
Discover why more than 1,500 members use 1stOncology™ to excel in:

Early/Late Stage Pipeline Development - Target Scouting - Clinical Biomarkers - Indication Selection & Expansion - BD&L Contacts - Conference Reports - Combinatorial Drug Settings - Companion Diagnostics - Drug Repositioning - First-in-class Analysis - Competitive Analysis - Deals & Licensing

                  Schedule Your 30 min Free Demo!

"This new update from the pivotal ENVISION trial of UGN-102 demonstrated a compelling probability of remaining in complete response of 80.6% at 18 months in patients who achieved a complete response (CR) at three months (79.6%)," said Sandip Prasad M.D., M.Phil., Director of Genitourinary Surgical Oncology, Vice Chair of Urology at Morristown Medical Center/Atlantic Health System, NJ, and Principal Investigator of the ENVISION trial. "Low-grade bladder cancer is a persistent cancer that frequently recurs and comes with its own risks. There is a significant unmet need in finding treatment options for patients with recurrent low-grade bladder cancer."

The existing standard of care for LG-IR-NMIBC is an invasive surgical procedure requiring anesthesia called transurethral resection of bladder tumor (TURBT). Repeated TURBT procedures can impact patients’ physical health and quality of life and are even associated with an increased risk in mortality. Due to high recurrence rates, LG-IR-NMIBC patients, who are typically elderly with comorbidities, will likely need multiple TURBTs under general anesthesia over the course of their lifetime. An estimated 59,000 patients with LG-IR-NMIBC recur annually and face the burden and risks of repeat surgeries that often provide limited value.

Mark Schoenberg, M.D., Chief Medical Officer of UroGen, stated, "The duration of response data from the ENVISION trial further underscores UGN-102’s potential to positively impact the treatment landscape for patients with recurrent LG-IR-NMIBC. Many of these patients are elderly and face the burden of repeated surgeries under general anesthesia, highlighting the urgent need for innovative treatment options. If approved, we believe UGN-102’s potential to deliver durable complete responses, reduce recurrence rates, and extend treatment-free intervals would represent a significant advancement in the management of recurrent LG-IR-NMIBC."

The most common treatment-emergent adverse events (TEAEs) in the ENVISION trial were dysuria, hematuria, urinary tract infection, pollakiuria, fatigue, and urinary retention. The TEAEs were typically mild-to-moderate in severity and either resolved or were resolving. The ENVISION trial demonstrated a similar safety profile to that observed in other studies of UGN‑102. Median follow-up time at 18 months was 18.7 months after the three-month CR.

UroGen completed the submission of a New Drug Application (NDA) to the U.S. Food and Drug Administration (FDA) for UGN-102 as a treatment for LG-IR-NMIBC ahead of schedule, and the FDA accepted the NDA for UGN-102 with a Prescription Drug User Free Act (PDUFA) goal date of June 13, 2025.

About UGN-102

UGN-102 (mitomycin) for intravesical solution is an innovative drug formulation of mitomycin, currently in Phase 3 development for the treatment of recurrent LG-IR-NMIBC. Utilizing UroGen’s proprietary RTGel technology, a sustained release, hydrogel-based formulation, UGN-102 is designed to enable longer exposure of bladder tissue to mitomycin, thereby enabling the treatment of tumors by non-surgical means. UGN-102 is delivered to patients using a standard urinary catheter in an outpatient setting by a trained healthcare professional. UroGen completed the submission of the rolling NDA for UGN-102 in August 2024, ahead of schedule. The FDA accepted the NDA for UGN-102 and assigned a PDUFA goal date of June 13, 2025.

About Non-Muscle Invasive Bladder Cancer (NMIBC)

LG-IR-NMIBC affects around 82,000 people in the U.S. every year and of those, an estimated 59,000 are recurrent. Bladder cancer primarily affects older populations with increased risk of comorbidities, with the median age of diagnosis being 73 years. Guideline recommendations for the management of NMIBC include TURBT as the standard of care. Up to 70 percent of NMIBC patients experience at least one recurrence and LG-IR-NMIBC patients are even more likely to recur and face repeated TURBT procedures.

About ENVISION

The Phase 3 ENVISION trial is a single-arm, multinational, multicenter pivotal study evaluating the efficacy and safety of UGN-102 (mitomycin) for intravesical solution as a chemoablative therapy in patients with LG-IR-NMIBC. The Phase 3 ENVISION trial completed target enrollment with 240 patients across 56 sites. Study participants received six once-weekly intravesical instillations of UGN-102. The primary endpoint evaluated the CR rate at the three-month assessment after the first instillation, and the key secondary endpoint evaluated durability over time in patients who achieved a CR at the three-month assessment. Learn more about the Phase 3 ENVISION trial at www.clinicaltrials.gov (NCT05243550).

On April 25, 2025 Prelude Therapeutics Incorporated (Nasdaq: PRLD), a clinical-stage precision oncology company, reported the presentation of new preclinical data at the American Association for Cancer Research (AACR) (Free AACR Whitepaper) Annual Meeting for its highly selective IV SMARCA2 degrader and its highly selective KAT6A degraders (Press release, Prelude Therapeutics, APR 25, 2025, View Source [SID1234652149]).

Schedule your 30 min Free 1stOncology Demo!
Discover why more than 1,500 members use 1stOncology™ to excel in:

Early/Late Stage Pipeline Development - Target Scouting - Clinical Biomarkers - Indication Selection & Expansion - BD&L Contacts - Conference Reports - Combinatorial Drug Settings - Companion Diagnostics - Drug Repositioning - First-in-class Analysis - Competitive Analysis - Deals & Licensing

                  Schedule Your 30 min Free Demo!

Peggy Scherle, Ph.D., Chief Scientific Officer of Prelude, stated, "We are pleased to provide further preclinical data on the discovery of our lead selective SMARCA2 degrader PRT3789, currently advancing in early clinical development for patients with SMARCA4 mutated cancers. We are also delighted to report initial preclinical data from our selective KAT6A degrader discovery program. These data demonstrate that selectively degrading KAT6A results in robust anti-cancer activity in various pre-clinical models of breast cancer and other solid tumors. We believe that our first-in-class, highly potent KAT6A selective degraders have the potential to expand the therapeutic reach of KAT6A/B inhibitors currently advancing in the clinic, while addressing safety challenges associated with non-selective approaches to this clinically validated target."

Details on the presentations are as follows:

Title: Elucidating the Molecular Mechanism of Action of the First-in-Human SMARCA2 Selective Degrader PRT3789

Summary:

•
PRT3789 is a first-in-human SMARCA2 degrader that selectively induces deep and sustained SMARCA2 degradation in preclinical and clinical studies.
•
PRT3789 achieves high selectivity by inducing a more stable ternary complex between SMARCA2 and VHL than SMARCA4 and VHL.

•
K1405 loop in SMARCA2 provides a unique lysine residue to enable selective ubiquitination and also stabilizes the SMARCA2:PRT3789:VHL complex.
•
SMARCA2 resynthesis rate is 2-3 times slower than SMARCA4 thereby enhancing the selectivity profile and contributing to the broad therapeutic index and favorable safety profile observed with PRT3789 in clinical studies to date.
•
PRT3789 is currently under evaluation in Phase 1 and Phase 2 studies in patients with advanced solid tumors with loss of SMARCA4 (NCT05639751 and NCT06682806).

Link: Publications – Prelude Therapeutics (preludetx.com)

Title: Discovery of First-in-Class Potent and Selective Oral Degraders of KAT6A that Demonstrate Anti-cancer Activity in Pre-clinical Models

Summary:

•
KAT6A expression is associated with cancer growth and is recurrently amplified in breast, lung, ovarian and other cancers.1
•
KAT6 is a clinically validated target with a dual KAT6A/B inhibitor recently demonstrating promising efficacy in heavily pre-treated patients with ER+/HER2- breast cancer, albeit with potential on-target safety considerations including neutropenia.2
•
Prelude hypothesized that a targeted protein degradation approach could enable discovery of KAT6A selective candidates with potential for improved hematological safety and more robust single agent activity relative to other KAT6-targeted approaches.
•
Prelude believes that it has identified a series of first-in-class, sub-nanomolar, selective and readily orally bioavailable KAT6A degraders now advancing to candidate nomination.
•
Pre-clinical data presented demonstrate that Prelude’s selective KAT6A degraders:
o
Drive significantly deeper anti-cancer responses compared to non-selective KAT6A/B inhibitors across multiple KAT6A-amplified tumors.
o
Disrupt the histone acetyltransferase (HAT) complex resulting in a deeper biological effect on ERα expression.
o
Show sustained activity in ESR1- and Pi3Kalpha-mutated cells, as well as endocrine therapy- and CDK4/6i-resistant cells.
o
Exhibit robust combination benefit with SoC and potential synergy with next generation breast cancer therapies.
o
Deliver robust in vivo target engagement and deep tumor regressions, including complete regressions, in breast and lung cancer xenografts as a monotherapy at low oral daily doses.
o
Display reduced hematologic toxicity compared to KAT6A/B inhibitors.

On April 25, 2025 Bexion Pharmaceuticals, Inc., a clinical-stage biopharmaceutical company developing a novel class of biologic therapy to treat solid tumor cancers and chemotherapy-induced peripheral neuropathy (CIPN), reported that the Company will participate in the American Association for Cancer Research (AACR) (Free AACR Whitepaper) Annual Meeting 2025 taking place April 25-30, 2025, in Chicago, Illinois (Press release, Bexion, APR 25, 2025, View Source [SID1234652166]). Details of the posters are included below.

Schedule your 30 min Free 1stOncology Demo!
Discover why more than 1,500 members use 1stOncology™ to excel in:

Early/Late Stage Pipeline Development - Target Scouting - Clinical Biomarkers - Indication Selection & Expansion - BD&L Contacts - Conference Reports - Combinatorial Drug Settings - Companion Diagnostics - Drug Repositioning - First-in-class Analysis - Competitive Analysis - Deals & Licensing

                  Schedule Your 30 min Free Demo!

First Poster Details:
Abstract Title: Development of an in-house methodology to analyze large clinical cancer biomarkers datasets
Abstract Number: 1105
Poster Board Number: 12
Session Title: Tumor Subtypes and Biomarker Discovery
Session Date: Sunday Apr 27, 2025
Session Time: 2:00 PM – 5:00 PM
Presenter: Dr. Tariq Arshad

Second Poster Details:
Abstract Title: Sphingolipid modulating compounds BXQ-350 and desipramine display synergy in reducing viability across multiple cancer cell types in vitro
Abstract Number: 5439
Poster Board Number: 17
Session Title: Therapeutic Targets and Mitochondrial Function
Session Date: Tuesday Apr 29, 2025
Session Time: 2:00 PM – 5:00 PM
Presenter: Dr. Tariq Arshad

The abstracts are scheduled to be posted to the AACR (Free AACR Whitepaper) Online Program Planner at 4:30 PM ET on Tuesday, March 25.

About AACR (Free AACR Whitepaper)
The American Association for Cancer Research (AACR) (Free AACR Whitepaper) is the first and largest cancer research organization dedicated to accelerating the conquest of cancer. The AACR (Free AACR Whitepaper) Annual Meeting program covers the latest discoveries across the spectrum of cancer research—from population science and prevention; to cancer biology, translational, and clinical studies; to survivorship and advocacy—and highlights the work of the best minds in research and medicine from institutions all over the world.

About BXQ-350
Bexion’s lead drug candidate is BXQ-350, a first-in-class biologic containing the multifunctional sphingolipid activator protein, Saposin C, and a phospholipid. Multiple Phase 1 clinical trials in adult and pediatric patients have demonstrated a robust safety profile for BXQ-350 with evidence of single agent activity across multiple solid tumor types. Additionally, other clinical and non-clinical data suggest BXQ-350 has activity in chemotherapy-induced peripheral neuropathy, an area of high unmet medical need in patients treated with oxaliplatin and other chemotoxic agents.

On April 25, 2025 Iksuda Therapeutics (Iksuda), the developer of class leading, clinically validated antibody drug conjugates (ADCs) reported that it will present three posters at the American Association for Cancer Research (AACR) (Free AACR Whitepaper) Annual Meeting in Chicago, Illinois (25-30 April) (Press release, Iksuda Therapeutics, APR 25, 2025, View Source [SID1234652182]). The posters cover the Company’s new payload class, the ProAlk series, its CA242-directed ADC, IKS04, being developed for the treatment of gastrointestinal (GI) cancers, and its proprietary PermaLink conjugation chemistry.

Schedule your 30 min Free 1stOncology Demo!
Discover why more than 1,500 members use 1stOncology™ to excel in:

Early/Late Stage Pipeline Development - Target Scouting - Clinical Biomarkers - Indication Selection & Expansion - BD&L Contacts - Conference Reports - Combinatorial Drug Settings - Companion Diagnostics - Drug Repositioning - First-in-class Analysis - Competitive Analysis - Deals & Licensing

                  Schedule Your 30 min Free Demo!

Iksuda will introduce its new ProAlk payload class which has a novel protein alkylating mechanism and is incorporated in ADCs in a prodrug format for enhanced targeting precision. ProAlk is active across a broad range of tumours and has been designed for optimal ADC relevance. It is associated with potent bystander activity and is MDR-resistant. Its novel mechanism will help to address the growing and significant challenge of ADC sequencing, where differentiation from tubulin and topoisomerase I inhibitor payloads will become imperative. Iksuda is building a pipeline of ProAlk driven ADCs which incorporate its proprietary PermaLink conjugation chemistry for ADC stability and tumour-selective payload activation and release for enhanced precision and safety.

The Company will also present a poster on IKS04, its CA242-directed ADC for the treatment of GI cancers and which is in IND-enabling studies. IKS04 uses a pro-drug approach for the tumour-specific delivery of a highly potent pyrrolobenzodiazepine (PBD) payload, avoiding the typical toxicity profile seen in traditional PBD ADCs. In preclinical trials, IKS04 is associated with in vivo efficacy which is substantially improved over benchmark ADCs in all tumour models, and a superior therapeutic index over all other PBD-based solid tumour ADC programs. IKS04 will be administered via pre-administration of naked antibody – a novel dosing regimen in the ADC field – to overcome high expression abundance and enable higher tumour penetration and consistent levels of efficacy across tumours. IKS04 is expected to enter clinical development in GI cancers by the end of 2025.

In addition, Iksuda will highlight its proprietary PermaLink conjugation chemistry, which is used across its early-stage ADC platform alongside the Company’s glucuronide linker formats and novel ProAlk payload. PermaLink offers a simple, scalable and highly stable bioconjugation method as an alternative to maleimide-based conjugation, enabling highly stable ADCs with favourable anti-tumour activity and safety.

Dr Dave Simpson, Chief Executive Officer, Iksuda Therapeutics, said:

"These three poster presentations at AACR (Free AACR Whitepaper) demonstrate Iksuda’s leadership in ADC innovation as we unveil our novel ProAlk payload class, overcoming the challenges in ADC sequencing and which will drive Iksuda’s deepening pipeline. With two clinical-stage programs, a growing pipeline of class leading ADCs and our expanding, innovative platforms, we are strongly positioned to progress new and promising ADCs to deliver improved outcomes for patients living with cancer. We look forward to progressing IKS04 into clinical development for GI cancers later this year, an area of high unmet need with limited effective treatment options and poor five-year survival rates for the significant number of patients with advanced disease."

Poster Presentation details:

ProAlk

Abstract Title:

PA289, a prodrug linker-payload with a novel mechanism of action for the development of antibody drug conjugates

Session Title:

Antibody-Based Cancer Therapeutics 1

Date/Time:

April 28, 2025 9:00 AM – 12:00 PM

Location:

Poster Section 15

Poster Number:

1579/28

IKS04

Abstract Title:

IKS04, an antibody drug conjugate with a highly potent DNA crosslinker payload for the treatment of gastrointestinal cancers

Session Title:

Antibody-Based Cancer Therapeutics 2

Date/Time:

April 28, 2025 2:00 PM – 5:00 PM

Location:

Poster Section 15

Poster Number:

2885/24

PermaLink

Abstract Title:

PermaLink, a stable and scalable bioconjugation platform as an alternative to maleimide-based conjugation

Session Title:

Antibody-Based Cancer Therapeutics 1

Date/Time:

April 28, 2025 9:00 AM – 12:00 PM

Location:

Poster Section 15

Poster Number:

1570/19