On May 6, 2025 Prelude Therapeutics Incorporated (Nasdaq: PRLD), a clinical-stage precision oncology company, reported its financial results for first quarter ended March 31, 2025, and provided an update on its clinical development pipeline and other corporate developments (Press release, Prelude Therapeutics, MAY 6, 2025, View Source [SID1234652590]).
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"The first quarter of 2025 represented another strong period of execution across our organization," stated Kris Vaddi, Ph.D., Chief Executive Officer of Prelude. "We are making rapid progress with the development of our SMARCA2 degraders and are on track to determine the most optimal path forward for the overall program as we continue to strengthen our knowledge and understanding of potential opportunities for these novel, first-in-class drug candidates in highly aggressive SMARCA4 mutated cancers."
Continued Vaddi, "Additionally, we were very pleased to present at the most recent American Association for Cancer Research (AACR) (Free AACR Whitepaper) Annual Meeting, the first preclinical data from our highly selective, oral KAT6A degraders. Selectively degrading KAT6A may hold the key to enhancing the efficacy and improving the safety profile for cancer patients beyond what has previously been demonstrated by non-selective KAT6A/B inhibitors. Our goal is to advance these potential growth driving assets towards points of value inflection in a strategic and financially disciplined manner."
Clinical Program Updates and Upcoming Milestones
PRT3789 – A first-in-class, highly selective, intravenous SMARCA2 Degrader
PRT3789 is designed to treat patients with a SMARCA4 mutation. Patients with SMARCA4-mutated cancer, a particularly aggressive form of the disease, have a very poor clinical prognosis. Approximately 10% of all non-small cell lung cancers and 5% of all cancers broadly, harbor a SMARCA4 mutation. In NSCLC, these patients tend to have poor response to standard of care chemoimmunotherapy and are largely ineligible for other targeted therapies. We believe that this represents an area of high unmet medical need.
PRT3789 is in Phase 1 clinical development in patients with biomarker selected SMARCA4-mutated cancers. The Company has completed enrollment of monotherapy dose escalation at the 665 mg once weekly IV dose and has selected 500 mg once weekly as the recommended Phase 2 dose. In addition, the Company has completed dose escalation in the combination of PRT3789 with docetaxel and is nearing completion of backfill cohorts. Updated data from the trial is expected to be presented at a major medical meeting in the second half of 2025.
The Company is enrolling patients in a Phase 2 clinical trial evaluating PRT3789 in combination with KEYTRUDA (pembrolizumab) in patients with SMARCA4-mutated cancers, per the previously announced collaboration with Merck (known as MSD outside of the US and Canada).
KEYTRUDA is a registered trademark of Merck Sharp & Dohme LLC, a subsidiary of Merck & Co., Inc., Rahway, NJ, USA.
Interim Phase 1 data presented at the 2025 Japanese Society of Medical Oncology Annual Meeting
As previously reported, the Company presented an encore oral presentation titled: PRT3789, a First-in-Class Intravenous SMARCA2 Degrader, in Advanced Solid Tumors with a SMARCA4 Mutation: Phase 1 Trial at the 2025 Japanese Society of Medical Oncology Annual Meeting on March 8, 2025, highlighting the favorable safety profile and responses seen in both NSCLC and upper GI cancers. The presentation can be found at Publications – Prelude Therapeutics.
PRT7732 – A potent, highly selective and orally bioavailable SMARCA2 Degrader
PRT7732 is a highly selective and orally bioavailable SMARCA2 degrader with a distinct chemical composition to PRT3789. In the fourth quarter of 2024, the Company initiated and enrolled the first patients in a phase 1 multi-dose escalation trial of PRT7732 (NCT06560645) in biomarker selected SMARCA4 mutated cancers. Enrollment has advanced rapidly, and the company is currently enrolling patients in the fifth dose escalation cohort (60 mg once daily). The Company expects to provide an initial first-in-human data update at a major medical meeting in the second half of 2025.
Highly selective KAT6A oral degrader program
Prelude discovered and is developing a series of highly potent, selective and orally bioavailable KAT6A degraders, which the Company believes is the industry’s first report of a KAT6 degrader based on currently published patents and literature. Optimized lead compounds are advancing to candidate nomination in the second quarter of 2025 with intent to file an IND in 2026. KAT6 is a clinically validated target with promising activity in breast cancer and other solid tumors. Recently, a dual KAT6A/B inhibitor demonstrated robust clinical activity in combination with fulvestrant in previously treated ER+/HER2- breast cancer patients, albeit with potential safety and tolerability considerations, in particular neutropenia.1 Hematologic toxicity is believed to be driven by the dual inhibition of KAT6A and KAT6B.
Prelude believes that selectively degrading KAT6A has the potential for improved efficacy, tolerability and combinability with other agents. The Company recently presented preclinical data validating this hypothesis at the AACR (Free AACR Whitepaper) Annual Meeting 2025. The presentation can be found at Publications – Prelude Therapeutics.
Precision ADCs with SMARCA2/4 dual degrader payload
Prelude is developing potent SMARCA2/4 dual degraders that robustly inhibit cancer cell growth and induce cell death across multiple cancer types as payloads for precision ADCs. The Company presented the first preclinical data from its precision ADC platform at the 36th EORTC-NCI-AACR (Free EORTC-NCI-AACR Whitepaper) Symposium in October. These data demonstrated that SMARCA2/4 dual degrader antibody conjugates have potential for significantly better in vivo efficacy and tolerability when compared to a traditional cytotoxic ADCs when tested head-to-head in xenograft models. Prelude and its partner AbCellera anticipate nominating the first development candidate from this program in 2025. The presentation can be found at Publications – Prelude Therapeutics.
Upcoming Investor Conference
The Company will participate in the Citizens 2025 Life Sciences Conference taking place in New York. On Wednesday, May 7, 2025 at 11:00 AM ET, Kris Vaddi, Ph.D., Chief Executive Officer, and Jane Huang, M.D., President and Chief Medical Officer, and Peggy Scherle, Ph.D., Chief Scientific Officer, will participate in a fireside chat.
A live webcast of the fireside chat can be accessed on the Company’s website under Events and Presentations. The recording will be archived and available on the Company’s website for 90 days.
First Quarter 2025 Financial Results
Cash, Cash Equivalents, Restricted Cash and Marketable Securities:
Cash, cash equivalents, restricted cash and marketable securities as of March 31, 2025 were $103.1 million. The Company anticipates that its existing cash, cash equivalents, restricted cash and marketable securities will fund Prelude’s operations into the second quarter of 2026.
Research and Development (R&D) Expenses:
For the first quarter of 2025, R&D expense increased to $28.8 million from $27.4 million for the prior year period. Included in the R&D expense for the three months ended March 31, 2025 was $2.3 million of non-cash expense related to stock-based compensation expense, including employee stock options, compared to $3.0 million for the three months ended March 31, 2024. Research and development expenses increased primarily due to an increase in expense related to our SMARCA2 clinical trials. Research and development expenses may fluctuate from period to period depending upon the stage of certain projects and the level of preclinical and clinical trial-related activities.
General and Administrative (G&A) Expenses:
For the first quarter of 2025, G&A expenses decreased to $5.8 million from $6.9 million for the prior year period. Included in general and administrative expenses for the three months ended March 31, 2025, was $1.6 million of non-cash expense related to stock-based compensation expense, including employee stock options, compared to $2.5 million for the three months ended March 31, 2024. The decrease in general and administrative expenses was primarily due to a decrease in stock-based compensation due to lower valuation on more recent grants due to the decrease in our stock price.
Net Loss:
For the three months ended March 31, 2025, net loss was $32.1 million, or $0.42 per share compared to $31.4 million, or $0.42 per share, for the prior year period. Included in the net loss for the three months ended March 31, 2025, was $3.8 million of non-cash expenses related to the impact of expensing share-based payments, including employee stock options, as compared to $5.5 million for the same period in 2024.