Kazia Therapeutics Announces First Patient Dosed in PNOC035 Clinical Study Evaluating Paxalisib for Recurrent Pediatric AT/RT Brain Cancer

Multicenter study to

evaluate paxalisib plus gemcitabine for children and young adults with recurrent or progressive AT/RT, where no approved therapies currently exist

SYDNEY, Sept. 9, 2026 /PRNewswire/ -- Kazia Therapeutics Limited (NASDAQ: KZIA) ("Kazia" or the "Company"), an oncology-focused biotechnology company developing therapies that selectively reprogram cancer biology, restore anti-tumor immunity and overcome treatment resistance, today announced that the first patient has been dosed in Arm A of PNOC035, a Phase 2 platform study evaluating paxalisib in combination with gemcitabine for patients ages 1 to 39 with recurrent or progressive atypical teratoid/rhabdoid tumor (AT/RT). AT/RT is widely recognized as one of the most aggressive forms of pediatric brain cancer.

PNOC035 is conducted by the Pediatric Neuro-Oncology Consortium (PNOC), an open-label, multi-center platform study. In Arm A, patients receive oral, once-daily paxalisib in combination with intravenous gemcitabine on Days 1, 8 and 15 of each 28-day treatment cycle.

The combination increased median survival nearly four-fold (22 to 82.5 days; p

Paxalisib has been granted both Orphan Drug Designation and Rare Pediatric Disease Designation by the U.S. Food and Drug Administration (FDA) for AT/RT. These designations do not constitute FDA approval or endorsement of any therapeutic claim. If paxalisib were to receive marketing approval for this indication, which would require successful completion of clinical development and FDA regulatory approval, Kazia could become eligible to receive a pediatric priority review voucher from the FDA.

"AT/RT typically affects infants and very young children, and families facing this devastating diagnosis have limited treatment options," said Dr. John Friend II, Chief Executive Officer of Kazia Therapeutics. "Despite decades of research, there are still no approved therapies for recurrent or progressive AT/RT, underscoring the urgent need for new treatment options. We've remained committed to pediatric brain cancer because this is an area where the need is especially great and the options are often fewest. Reaching this milestone with the PNOC035 team is a meaningful step forward, and we look forward to working closely with PNOC as enrollment progresses."

About PNOC035

PNOC035 is a Phase 2 platform trial conducted by the Pediatric Neuro-Oncology Consortium (PNOC) for patients ages 1 to 39 with recurrent or progressive AT/RT. The platform design allows multiple treatment arms to be evaluated within a shared trial infrastructure, with patients enrolling in an arm based on availability and arm-specific eligibility criteria. Arm A evaluates paxalisib in combination with gemcitabine. Additional information about the study is available on ClinicalTrials.gov (NCT07447076).

About Kazia Therapeutics

Kazia Therapeutics Limited (NASDAQ: KZIA) is an oncology-focused drug development company, based in Sydney, Australia. The Company's lead asset, paxalisib, is an investigational brain penetrant inhibitor of the PI3K/Akt /mTOR pathway, which is being developed to treat multiple forms of cancer. Licensed from Genentech in late 2016, paxalisib is or has been the subject of over 15 clinical trials. A completed Phase 2/3 study in glioblastoma (GBM AGILE) was reported in 2024, and discussions are ongoing for designing and executing a pivotal registrational study in pursuit of a standard approval. Other clinical trials involving paxalisib are ongoing in advanced breast cancer, brain metastases, diffuse midline gliomas, and primary central nervous system lymphoma, with several of these trials having reported encouraging interim data. Paxalisib was granted Orphan Drug Designation for glioblastoma by the U.S. Food and Drug Administration (FDA) in February 2018, and Fast Track Designation (FTD) for glioblastoma in August 2020. Paxalisib was also granted FTD in July 2023 for the treatment of solid tumor brain metastases harboring PI3K pathway mutations in combination with radiation therapy. Additionally, 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 tumors 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. In addition to its clinical-stage programs, Kazia is advancing NDL2, a potentially first-in-class intracellular PD-L1 protein degrader program targeting a newly identified mechanism of immunotherapy resistance and metastatic progression, as well as MSETC, a potentially first-in-class SETDB1 inhibitor program intended to restore immune signaling in tumors that have become resistant to immunotherapy, including checkpoint inhibitors. Both programs are currently in preclinical development. For more information, please visit http://www.kaziatx.com/ or follow us on X @KaziaTx.

Forward-Looking Statements

This announcement may contain forward-looking statements, which can generally be identified by words such as "may," "will," "estimate," "future," "forward," "anticipate," "expect," "plan," "believe," "potential," "could," or similar terms. Forward-looking statements in this release include, but are not limited to, statements regarding: the conduct, timing and progress of enrollment in the PNOC035 study; the potential therapeutic benefit of paxalisib in AT/RT; the possibility of clinical results that are consistent with the preclinical data; and the possibility that Kazia could become eligible to receive a priority review voucher if paxalisib were to receive marketing approval for AT/RT, which remains uncertain and is subject to the successful completion of clinical development and regulatory review; the design, execution and outcome of a potential pivotal registrational study of paxalisib for glioblastoma; the therapeutic potential and clinical development of paxalisib in other indications, including advanced breast cancer, brain metastases, diffuse midline gliomas and primary central nervous system lymphoma; and the preclinical development and potential of Kazia's earlier-stage programs, including NDL2 and MSETC. Such statements are based on Kazia's current expectations and are subject to risks and uncertainties that could cause actual results to differ materially, including those described in Kazia's Annual Report on Form 20-F and subsequent filings with the SEC. Kazia undertakes no obligation to update any forward-looking statement except as required by law.