Kazia Therapeutics to Present Data Highlighting Synergistic Activity Between Paxalisib and Immunotherapy in Immunotherapy-Resistant Triple Negative Breast Cancer Model at the San Antonio Breast Cancer Symposium

SYDNEY, Dec. 11, 2024 /PRNewswire/ -- Kazia Therapeutics Limited (NASDAQ: KZIA), an oncology-focused drug development, announced that data from two abstracts will be presented at the San Antonio Breast Cancer Symposium highlighting the activity the Company’s lead product candidate, paxalisib, for the potential treatment of immunotherapy-resistant triple negative breast cancer (TNBC) and HER2 positive metastatic breast cancer with active brain metastases.

“Immunotherapy-resistant triple negative breast cancer represents one of the most difficult-to-treat areas of breast cancer, with a growing number of patients who have failed standard-of-care immunotherapy and require new treatment options,” said John Friend, M.D., President and Chief Executive Officer of Kazia Therapeutics. “These new preclinical data highlight the potential therapeutic synergies between paxalisib and the checkpoint inhibitor, pembrolizumab (KEYTRUDA®), when used in combination in a preclinical model of immunotherapy-resistant triple negative breast cancer. Furthermore, these data also show synergies when paxalisib is combined with the PARP inhibitor, olaparib (LYNPARZA®), which is approved for the treatment of advanced BRCA-mutated HER2 negative metastatic breast cancer.

“In a second abstract, clinical investigators presented efficacy and safety data in heavily pretreated patients (median prior 8 lines of therapy) with HER2 positive breast cancer with active brain metastases. Although the primary endpoint of overall response rate (ORR) was not met, patients receiving a combination of paxalisib and trastuzumab (ENHERTU®) had a median overall survival of 16.5 months, which compares favorably versus historical control studies.”

Presentation Details:

Conclusions: The addition of paxalisib to immunotherapy in the 4T1 TNBC mouse model reduced primary tumor burden, lung metastases, and liver inflammation whilst overcoming toxicity complications and resistance associated with standard-of-care immunochemotherapy. Paxalisib in combination with the PARP inhibitor olaparib, but not monotherapy alone, also reduced primary tumor burden and metastases. Moving forward, work is ongoing to elucidate the PI3K-mTOR mechanism of overcoming metastasis and drug resistance as well as the translation of the data into a clinical development program for patients with TNBC and advanced breast cancer.

Conclusions: In this heavily pre-treated population of pts with HER2+ active BCBM, the combination of paxalisib 30 mg daily with trastuzumab was feasible, with a toxicity profile consistent with a class effect of PI3K/mTOR inhibitors. However, it was associated with minimal clinical activity.

About Kazia Therapeutics Limited

Kazia Therapeutics Limited (NASDAQ: KZIA) is an oncology-focused drug development company, based in Sydney, Australia. Our lead program is paxalisib, an investigational brain-penetrant inhibitor of the PI3K / Akt / mTOR pathway, which is being developed to treat multiple forms of brain cancer. Licensed from Genentech in late 2016, paxalisib is or has been the subject of ten clinical trials in this disease. A completed Phase 2 study in glioblastoma reported early signals of clinical activity in 2021, and a pivotal study in glioblastoma, GBM AGILE, has been completed and a Type C meeting with the FDA is scheduled in December 2024. Other clinical trials involving paxalisib are ongoing in brain metastases, diffuse midline gliomas, and primary CNS lymphoma, with several of these trials having reported encouraging interim data. Paxalisib was granted Orphan Drug Designation for glioblastoma by the FDA in February 2018, and Fast Track Designation (FTD) for glioblastoma by the FDA in August 2020. Paxalisib was also granted FTD in July 2023 for the treatment of solid tumour brain metastases harboring PI3K pathway mutations in combination with radiation therapy. In addition, paxalisib was granted Rare Pediatric Disease Designation and Orphan Drug Designation by the FDA for diffuse intrinsic pontine glioma in August 2020, and for atypical teratoid / rhabdoid tumours in June 2022 and July 2022, respectively. Kazia is also developing EVT801, a small-molecule inhibitor of VEGFR3, which was licensed from Evotec SE in April 2021. Preclinical data has shown EVT801 to be active against a broad range of tumour types and has provided evidence of synergy with immuno-oncology agents. A Phase I study has been completed and preliminary data was presented at 15th Biennial Ovarian Cancer Research Symposium in September 2024. For more information, please visit www.kaziatherapeutics.com or follow us on X @KaziaTx.

Forward-Looking Statements

This announcement may contain forward-looking statements, which can generally be identified as such by the use of words such as “may,” “will,” “estimate,” “future,” “forward,” “anticipate,” or other similar words. Any statement describing Kazia’s future plans, strategies, intentions, expectations, objectives, goals or prospects, and other statements that are not historical facts, are also forward-looking statements, including, but not limited to, statements regarding: the timing for results and data related to Kazia’s clinical and preclinical trials, Kazia’s strategy and plans with respect to its programs, including paxalisib and EVT801, the potential benefits of paxalisib as an investigational PI3K/mTOR inhibitor, timing for any regulatory submissions or discussions with regulatory agencies, and the potential market opportunity for paxalisib. Such statements are based on Kazia’s current expectations and projections about future events and future trends affecting its business and are subject to certain risks and uncertainties that could cause actual results to differ materially from those anticipated in the forward-looking statements, including risks and uncertainties: associated with clinical and preclinical trials and product development, related to regulatory approvals, and related to the impact of global economic conditions. These and other risks and uncertainties are described more fully in Kazia’s Annual Report, filed on form 20-F with the United States Securities and Exchange Commission, or the SEC, and in subsequent filings with the SEC. Kazia undertakes no obligation to publicly update any forward-looking statement, whether as a result of new information, future events, or otherwise, except as required under applicable law. You should not place undue reliance on these forward-looking statements, which apply only as of the date of this announcement.

This announcement was authorized for release by Dr John Friend, CEO.

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