On August 8, 2024 Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, reported pipeline progress and business updates and reported financial results for the second quarter ended June 30, 2024 (Press release, Xilio Therapeutics, AUG 8, 2024, View Source [SID1234645629]).
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"This quarter, we continued to make meaningful progress advancing our clinical-stage pipeline toward key data milestones and potential value drivers anticipated later this year," said René Russo, Pharm.D., president and chief executive officer of Xilio. "We recently initiated enrollment in our Phase 2 trial of XTX101 in combination with atezolizumab in patients with MSS CRC and our Phase 1 monotherapy dose expansion for XTX301 in patients with advanced solid tumors, and we look forward to reporting clinical data for each of these programs in the fourth quarter. Beyond our clinical-stage pipeline, we are also advancing multiple research-stage programs leveraging our tumor-activated approach for masked immune cell engagers."
Dr. Russo continued, "I am excited to announce the promotion of Chris Frankenfield to chief financial officer of Xilio. Chris’ strategic, financial and operational expertise, together with his collaborative approach and experience building companies, will be instrumental in advancing our pipeline of novel tumor-activated immuno-oncology therapies."
Pipeline and Business Updates
XTX101: tumor-activated anti-CTLA-4
XTX101 is an investigational tumor-activated, Fc-enhanced, high affinity binding anti-CTLA-4 designed to block CTLA-4 and deplete regulatory T cells when activated (unmasked) in the tumor microenvironment (TME).
● Xilio reported the initiation of enrollment in its Phase 2 clinical trial of XTX101 in combination with atezolizumab in patients with MSS CRC, including patients with and without liver metastases. The trial will evaluate the safety and efficacy of XTX101 at 100 mg every six weeks (Q6W) in combination with atezolizumab at 1200 mg every three weeks (Q3W).
● Xilio expects to report initial Phase 2 data for XTX101 in combination with atezolizumab in approximately 20 patients with MSS CRC in the fourth quarter of 2024 and in approximately 20 additional patients (40 patients total) in the first quarter of 2025.
XTX301: tumor-activated, engineered IL-12
XTX301 is an investigational tumor-activated, engineered IL-12 molecule designed to potently stimulate anti-tumor immunity and reprogram the TME of poorly immunogenic "cold" tumors towards an inflamed, or "hot," state.
● Xilio reported the initiation of enrollment in Phase 1B monotherapy dose expansion of its ongoing Phase 1 clinical trial of XTX301 in patients with advanced solid tumors. In addition, enrollment in monotherapy dose escalation for XTX301 is ongoing, with XTX301 currently being evaluated at a dose level of 60 ug/kg Q6W (preceded by a single priming dose of 15 ug/kg). To date, XTX301 has been generally well-tolerated, with no dose-limiting toxicities observed in patients.
● Xilio expects to report safety, pharmacokinetic and pharmacodynamic data from the ongoing Phase 1 clinical trial for XTX301 in the fourth quarter of 2024.
Tumor-activated bispecific and immune cell engager programs
● Xilio is advancing a pipeline of research-stage tumor-activated bispecifics and immune cell engagers, including tumor-activated cell engagers and tumor-activated effector-enhanced cell engagers, leveraging the company’s masking technology.
Corporate Updates
● Xilio reported the promotion of Chris Frankenfield to chief financial officer. Mr. Frankenfield will also continue to serve in his current role as chief operating officer.
● In June 2024, Xilio announced the appointments of Aoife Brennan, M.D., and James Shannon, M.D., to its board of directors.
Second Quarter 2024 Financial Results
● Cash Position: Cash and cash equivalents were $74.9 million as of June 30, 2024, compared to $44.7 million as of December 31, 2023. Cash and cash equivalents as of June 30, 2024 included the $30.0 million upfront payment under the company’s license agreement with Gilead Sciences, Inc. (Gilead) for XTX301, approximately $28.1 million in gross proceeds from the sale and issuance of common stock and prefunded warrants to certain existing accredited investors and Gilead in private placements and $7.0 million in gross proceeds from the sale and issuance of common stock under the company’s at-the-market offering program.
● License Revenue: License revenue was $2.4 million for the quarter ended June 30, 2024, which was associated with revenue recognized under the license agreement and stock purchase agreement with Gilead. No license revenue was recognized prior to the quarter ended June 30, 2024.
● Research & Development (R&D) Expenses: R&D expenses were $11.2 million for the quarter ended June 30, 2024, compared to $13.2 million for the quarter ended June 30, 2023. The decrease was primarily driven by decreased manufacturing activities for XTX301, decreased clinical development activities for XTX202, decreased spending related to early-stage programs and indirect research and development costs and decreased personnel-related costs, partially offset by a $1.0 million development milestone payment to WuXi Biologics (Hong Kong) Limited under the company’s CTLA-4 monoclonal antibody license agreement, and increased clinical development activities for XTX101 and XTX301.
● General & Administrative (G&A) Expenses: G&A expenses were $5.8 million for the quarter ended June 30, 2024, compared to $6.9 million for the quarter ended June 30, 2023. The decrease was primarily driven by decreased personnel-related costs, decreased professional and consulting fees, lower costs related to directors’ and officers’ liability insurance and a reduction in other general and administrative expenses.
● Net Loss: Net loss was $13.9 million for the quarter ended June 30, 2024, compared to $19.4 million for the quarter ended June 30, 2023.
Financial Guidance
Based on its current operating plans, Xilio anticipates that its existing cash and cash equivalents as of June 30, 2024 will be sufficient to fund its operating expenses and capital expenditure requirements into the second quarter of 2025.
About XTX101 (anti-CTLA-4) and the Phase 1/2 Combination Clinical Trial
XTX101 is an investigational tumor-activated, Fc-enhanced, high affinity binding anti-CTLA-4 monoclonal antibody designed to block CTLA-4 and deplete regulatory T cells when activated (unmasked) in the tumor microenvironment. In the third quarter of 2023, Xilio entered into a co-funded clinical trial collaboration with Roche to evaluate XTX101 in combination with atezolizumab (Tecentriq) in a multi-center, open-label Phase 1/2 clinical trial. Xilio is currently evaluating the safety and efficacy of the combination in a Phase 2 clinical trial in patients with microsatellite stable colorectal cancer. Please refer to NCT04896697 on www.clinicaltrials.gov for additional details.
About XTX301 (IL-12) and the Phase 1 Clinical Trial
XTX301 is an investigational tumor-activated IL-12 designed to potently stimulate anti-tumor immunity and reprogram the tumor microenvironment of poorly immunogenic "cold" tumors towards an inflamed or "hot" state. In March 2024, Xilio entered into an exclusive license agreement with Gilead Sciences, Inc. for Xilio’s tumor-activated IL-12 program, including XTX301. Xilio is currently evaluating the safety and tolerability of XTX301 as a monotherapy in patients with advanced solid tumors in a first-in-human, multi-center, open-label Phase 1 clinical trial. Please refer to NCT05684965 on www.clinicaltrials.gov for additional details.