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CHICAGO, Mar. 20, 2025 (GLOBE NEWSWIRE) — Pathos AI, (www.pathos.com), a clinical-stage biotechnology company focused on re-engineering drug development through artificial intelligence, announced the first patient has been dosed in the Company’s Phase 1b/2a clinical trial evaluating pocenbrodib, a CBP/p300 inhibitor, alone and in combination with abiraterone acetate, olaparib or 177Lu-PSMA-617 in patients with metastatic castration-resistant prostate cancer (mCRPC), (P300-02-001, NCT06785636). Pocenbrodib is Pathos’ first clinical-stage asset in its pipeline. “The clinical promise of pocenbrodib, our potential best-in-class CBP/p300 inhibitor, lies not only in its remarkable efficacy in resistant prostate cancer models, but also in our sophisticated biomarker strategy that identifies patients most likely to benefit,” said Dr. Jens Renstrup, Chief Medical Officer. “Our precision medicine approach allows us to target the underlying resistance mechanisms to AR-targeted therapy through CBP/p300 inhibition, addressing a significant area of high unmet need for patients with advanced prostate cancer. By integrating multiomic data tied to real-world outcomes to identify specific molecular signatures, our PathOSTM platform enables us to select the right patients for treatment, potentially improving outcomes in a disease with limited therapeutic options as resistance develops. This study builds on the previously reported data from COURAGE study (NCT04575766) in metastatic castration-resistant prostate cancer and reinforces our confidence in pocenbrodib’s potential to improve outcomes for these patients.” Study P300-02-001 is a multicenter, open-label, dose-finding Phase 1b/2a clinical trial to confirm the safety, pharmacokinetics (PK), preliminary antitumor activity, and pharmacodynamics (PD) of pocenbrodib alone or in combination with abiraterone acetate, olaparib or 177Lu-PSMA-617, in adults with metastatic castration-resistant prostate cancer (mCRPC). The study is expected to enroll approximately 203 patients with mCRPC who have progressed despite prior therapy and have been treated with at least one anti-androgen therapy (enzalutamide, apalutamide, abiraterone acetate, or darolutamide). The primary objectives of the study are to assess the safety, objective response rate, and PSA decline of pocenbrodib alone and in combination with abiraterone acetate, olaparib or 177Lu-PSMA-617, and to define a preliminary recommended Phase 2 dose (RP2D) of pocenbrodib in combination with abiraterone acetate, olaparib or 177Lu-PSMA-617. About Pocenbrodib Pocenbrodib is an oral, small molecule inhibitor that has the potential to provide clinical benefit for patients with advanced prostate cancer, either alone or in combination with other treatments. Pocenbrodib works by inhibiting CREBBP/EP300 (also known as CBP/p300), which are proteins that activate genes that promote cancer cell growth and proliferation. Inhibiting these proteins impacts the expression of key cancer drivers, including the androgen receptor (AR) and its variants, making pocenbrodib relevant not only to advanced prostate cancer, but also to other cancer indications, either alone or in combination with other treatments. About Pathos AI Pathos is a clinical-stage biotechnology company powered by advanced AI that is re-engineering drug development by optimizing patient selection strategies in phase 2 clinical trials. Through partnerships with pharmaceutical companies, Pathos leverages AI-driven computational approaches across multimodal real-world data and patient-derived biological models to accelerate precision medicine development. Pathos has raised over $100 million to expand its AI platform and bring targeted treatments to patients faster. Additional information can be found at www.pathos.com.

Chicago – Pathos AI, Inc. (www.pathos.com), a biotechnology company focused on revolutionizing precision medicine in cancer by harnessing the power of machine learning to transform drug development, announced today the world-wide license of PRT811, a potent, selective, and orally bioavailable brain penetrant SAM-competitive PRMT5 inhibitor from Prelude Therapeutics. PRT811 (renamed P-500) was developed by Prelude Therapeutics and completed a Phase 1 trial in March 2023. The trial enrolled patients with solid tumors including high-grade glioma and uveal melanoma and has potential application in other indications with high unmet need. Out of 16 patients with high-grade glioma with isocitrate dehydrogenase mutations (IDH+) in the Phase 1 trial, two confirmed complete responses (CR) were observed. At last follow-up, 1 response is ongoing and has lasted 31.0 months while the duration of response for the second CR patient was 7.5 months. Additionally, 1 patient achieved an unconfirmed partial response (PR). In addition, out of 23 uveal melanoma patients (10 patients with splicing factor 3B subunit 1 (SF3B1) splicing mutations and 13 without an SF3B1 mutation), one confirmed PR (duration of response of 10 months) and a second unconfirmed PR were observed, both in patients SF3B1 mutations. In the entire safety population (N=86), the most common adverse events of any grade, with an incidence of >20% were nausea (60.5%), vomiting (46.5%) fatigue (36.0%), constipation (29.1%), and thrombocytopenia (24.4%), and were predominantly grade 1-2. The most common adverse events (grade ≥3), occurring >5% were thrombocytopenia (9.3%), anemia (9.3%), and fatigue (5.8%). “These results from Prelude’s Phase 1 study are promising news for high-grade glioma patients and clinicians, who still have limited treatment options with chemotherapy and radiation that hasn’t changed in decades. With our AI Platform, we aim to increase the already encouraging response rate of P-500 through a novel biomarker-driven strategy, ultimately bringing this medicine to patients as efficiently as possible,” said Ryan Fukushima, Pathos CEO. “Prelude’s discovery engine has delivered a number of first- or best-in-class precision medicines including PRT811, a molecule that has shown early promise in the treatment of high-grade glioma. We are confident that Pathos AI, sharing our passion for precision medicine and commitment to serving cancer patients with high unmet need, is an ideal company to drive the development of this molecule forward for patients.” said Sean Brusky, Prelude CBO. “The resources from this transaction will support advancing Prelude’s pipeline.” About P-500 P-500 (previously PRT811) is a selective, brain-penetrant small molecule inhibitor of protein arginine methyltransferase 5 (PRMT5) that has the potential to provide clinical benefit for patients with advanced solid tumors, including high-grade glioma and uveal melanoma. PRMT5 is an enzyme that adds methyl groups to proteins in cells using a molecule called S-adenosylmethionine (SAM) which regulates protein function and interactions. Several processes that support cancer cell growth and spread depend on PRMT5, making P-500 relevant not only to advanced high-grade glioma and uveal melanoma (in which objective responses to P-500 were observed in the Phase 1 clinical trial) but also to a number of other cancer indications. Preclinical studies have demonstrated PRMT5 inhibition can sensitize cancer cells to other treatments, expanding the application of P-500 to combination therapy in additional indications. About Pathos Pathos is a clinical-stage biotechnology company focused on re-engineering drug development, leveraging the power of AI technologies to bring precision medicines to market through partnership with biopharmaceutical companies. Pathos has raised $40 million to accelerate the development of precision medicines and to expand its platform, combining computational approaches across multimodal real-world data and patient-derived biological models. Additional information can be found at www.pathos.com.