On track to report updated Phase 1 masofaniten plus enzalutamide dose escalation data in patients with mCRPC naïve to second generation antiandrogens in the second half of 2024 Presentation of Phase 1b monotherapy results expected to be reported in the second half of 2024 Phase 2 dose expansion underway evaluating masofaniten plus enzalutamide in patients with mCRPC naïve to second generation antiandrogens; ESSA projecting completion of enrollment in the first quarter of 2025, with preliminary data expected in mid-2025 Cash runway sufficient to fund operations well beyond 2025 SOUTH SAN FRANCISCO, California and VANCOUVER, Canada, Aug. 5, 2024 /CNW/ - ESSA Pharma Inc. ("ESSA", or the "Company") (NASDAQ:EPIX), a clinical-stage pharmaceutical company focused on developing novel therapies for the treatment of prostate cancer, today provided a corporate update and reported financial results for the fiscal third quarter ended June 30, 2024. "With continued focus on execution, we are progressing towards a stream of significant milestones throughout the next nine to twelve months, with the first being the presentation at ESMO of more mature durability data from the Phase 1 dose escalation study evaluating masofaniten combined with enzalutamide in patients with metastatic castration-resistant prostate cancer naïve to second-generation antiandrogens," said David Parkinson, MD, President and CEO of ESSA. "We are focused on the enrollment of the Phase 2 dose expansion study evaluating masofaniten in combination with enzalutamide, with 25 sites activated in the US, Canada and Australia and an additional 14 sites being activated in Europe. We look forward to reporting key data across these trials throughout the remainder of this year through 2025." Third Quarter Fiscal 2024 and Recent Highlights Masofaniten Combination Studies Phase 1/2 study is still ongoing evaluating masofaniten in combination with enzalutamide in patients with metastatic castration-resistant prostate cancer ("mCRPC") naïve to second-generation antiandrogens but may have been treated with chemotherapy in the metastatic castration-sensitive setting. The latest reported results, which were presented at the ASCO-GU symposium in January 2024, demonstrated that the combination regimen continues to be well tolerated at the dose levels tested in up to 25 cycles of dosing in some patients. Reductions in PSA were observed across evaluable patients for efficacy in all dosing cohorts (n=16). Across all dosing cohorts, 88% of patients achieved PSA50, 81% of patients achieved PSA90, 69% of patients achieved PSA90 in less than 90 days, and 63% of patients achieved PSA <0.2ng/mL. While the data for time to PSA progression were still maturing, the median time to PSA progression was reported as 16.6 months with a median follow up at that time of 11.1 months. ESSA plans to report updated data from the Phase 1 dose escalation study at the European Society for Medical Oncology (ESMO) 2024 congress. Masofaniten continues to be evaluated in combination with enzalutamide compared to enzalutamide monotherapy in a Phase 2 dose randomized study in patients with mCRPC naïve to second-generation antiandrogens but who may have been treated with chemotherapy in the metastatic castration-sensitive setting. Enrollment in the Phase 2 portion of this Phase 1/2 study is expected to be completed during the first quarter of 2025. The study is currently enrolling at approximately 25 sites in the US, Canada, and Australia. Expansion to European clinical sites is in progress with an additional 14 clinical sites planned to be activated by the third quarter of 2024. ESSA is on track to report preliminary data from the Phase 2 dose expansion portion of the study in mid-2025. Two additional masofaniten combination arms are continuing enrollment as part of the ongoing Phase 1 masofaniten study. One arm is evaluating masofaniten in combination with abiraterone acetate and prednisone in patients with either metastatic castration-sensitive prostate cancer or mCRPC, while the second arm is evaluating masofaniten in combination with apalutamide in patients with non-metastatic castration-resistant prostate cancer after 12 weeks of masofaniten single agent. Two additional investigator-sponsored studies testing combinations of masofaniten with darolutamide or enzalutamide in different patient populations are currently enrolling: a) an Australian investigator-sponsored neoadjuvant study evaluating neoadjuvant use of the combination of masofaniten and darolutamide compared to darolutamide monotherapy in high-risk patients undergoing prostatectomy and b) an investigator-sponsored study which is testing masofaniten and enzalutamide in metastatic castration-sensitive prostate cancer patients. Masofaniten Monotherapy Study ESSA remains on track to complete the Phase 1b masofaniten monotherapy study evaluating masofaniten in patients with mCRPC resistant to second-generation antiandrogens. The initial results from the monotherapy study were reported at the 2023 ASCO-GU Symposium, and demonstrated that masofaniten monotherapy was well-tolerated, achieved clinically significant exposures, and showed preliminary signals of anti-tumor activity in a subset of patients. ESSA plans to present the complete Phase 1b monotherapy results in the second half of 2024 at a medical conference. Summary Financial results(Amounts expressed in U.S. dollars) Net Loss. ESSA recorded a net loss of $7.2 million for the third quarter ended June 30, 2024, compared to $7.3 million for the third quarter ended June 30, 2023. Research and Development ("R&D") expenditures. R&D expenditures for the third quarter ended June 30, 2024, were $5.5 million compared to $6.3 million for the third quarter ended June 30, 2023, and include non-cash costs related to share-based payments of $851,971 for the third quarter ended 2024 compared to $599,621 for the third quarter ended 2023. The decrease is largely attributable to reductions in preclinical work with the focus on ongoing clinical trials. General and Administration ("G&A") expenditures. G&A expenditures for the third quarter ended June 30, 2024, were $3.2 million compared to $2.6 million for the third quarter ended June 30, 2023, and include non-cash costs related to share-based payments of $1,748,227 for the third quarter ended 2024 compared to $561,452 for the third quarter ended 2023. The net decrease (net of share-based payments) relates to the timing of corporate projects and lower insurance premiums for the current period. Liquidity and Outstanding Share Capital As of June 30, 2024, the Company had available cash reserves and short-term investments of $130.7 million. The Company's cash position is expected to ...