Phase 1 data for efarindodekin alfa (XTX301) demonstrate promising anti-tumor activity in patients with advanced solid tumors Achievement of milestone extends anticipated cash runway into first quarter of 2027 WALTHAM, Mass., Sept. 09, 2025 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living... Read More

Announced updated Phase 2 data at ASCO for vilastobart, a tumor-activated, Fc-enhanced, anti-CTLA-4, demonstrating deep and durable responses and a meaningfully differentiated safety and tolerability profile for an anti-CTLA-4 combination therapy On track with plans to nominate first development candidates for wholly owned masked T cell engager programs in second half of 2025 $121.6 million in cash and cash equivalents as of... Read More

WALTHAM, Mass., Aug. 01, 2025 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced that, effective August 1, 2025, the company granted non-qualified stock options to purchase 134,000 shares of its common stock to two new employees under Xilio Therapeutics’ 2022... Read More

WALTHAM, Mass., July 02, 2025 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced that, effective July 1, 2025, the company granted non-qualified stock options to purchase 10,700 shares of its common stock to two new employees under Xilio Therapeutics’ 2022... Read More

WALTHAM, Mass., June 10, 2025 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced the appointment of Akintunde (Tunde) Bello, Ph.D., to the company’s board of directors. “Tunde is an accomplished leader with a strong track record of successfully developing novel... Read More

Total gross proceeds of up to $150.0 million before the end of 2026 if all Series B warrants and Series C warrants are exercised for cash Xilio may elect to cancel unexercised Series B or Series C warrants proportionately to the amount of non-dilutive capital received, under certain circumstances Financing co-led by new investors Coastlands Capital and Frazier Life Sciences and included participation from Gilead Sciences,... Read More

WALTHAM, Mass., June 03, 2025 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced that, effective June 1, 2025, the company granted non-qualified stock options to purchase 181,300 shares of its common stock to five new employees under Xilio Therapeutics’ 2022... Read More

WALTHAM, Mass., June 02, 2025 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced the pricing of an underwritten public offering of pre-funded warrants to purchase 66,676,000 shares of common stock (the “pre-funded warrants”), accompanied by Series A warrants to... Read More

WALTHAM, Mass., June 02, 2025 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced that it is commencing an underwritten public offering of pre-funded warrants to purchase shares of common stock accompanied by Series A warrants to purchase shares of common stock... Read More

26% preliminary objective response rate observed in heavily pre-treated patients with metastatic microsatellite stable colorectal cancer (MSS CRC) without liver metastases Deep and durable responses ongoing for up to 37 weeks through the data cutoff, accompanied by substantial decreases in tumor biomarkers and improvements in clinical symptoms MSS CRC patient with liver metastasis and previously reported confirmed partial... Read More

Updated Phase 2 data to be presented at ASCO for vilastobart, a tumor-activated, Fc-enhanced, anti-CTLA-4, in combination with atezolizumab in patients with metastatic microsatellite stable colorectal cancer (MSS CRC) Advancing multiple masked T cell engager programs utilizing Xilio’s novel ATACR and SEECR formats, with first development candidates anticipated in second half of 2025 WALTHAM, Mass., May 08, 2025 (GLOBE... Read More

WALTHAM, Mass., May 02, 2025 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced that, effective May 1, 2025, the company granted a non-qualified stock option to purchase 5,000 shares of its common stock to one new employee under Xilio Therapeutics’ 2022 Inducement... Read More

WALTHAM, Mass., April 23, 2025 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced plans to present updated data from its ongoing Phase 2 clinical trial investigating vilastobart, a tumor-activated, Fc-enhanced anti-CTLA-4, in combination with atezolizumab... Read More

WALTHAM, Mass., April 04, 2025 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced that, effective April 1, 2025, the company granted non-qualified stock options to purchase an aggregate of 22,900 shares of its common stock to three new employees under Xilio... Read More

Additional Phase 2 data for vilastobart, a tumor-activated, Fc-enhanced anti-CTLA-4, in combination with atezolizumab in patients with MSS CRC anticipated in the middle of 2025 Advancing masked T cell engager programs in novel ATACR and SEECR formats for PSMA, CLDN18.2 and STEAP1 Announced collaboration with AbbVie in the first quarter of 2025 to develop novel tumor-activated, antibody-based immunotherapies, including masked... Read More

WALTHAM, Mass., Feb. 24, 2025 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced that René Russo, Pharm.D., president and chief executive officer, will participate in a fireside chat at the TD Cowen 45th Annual Health Care Conference on Monday, March 3, 2025 at... Read More

Also entered into collaboration and option agreement with AbbVie to develop novel tumor-activated immunotherapies, including masked T cell engagers, with $52.0 million in upfront payments Extended anticipated cash runway into the first quarter of 2026 Company to host investor conference call and webcast today at 8:30 am ET WALTHAM, Mass., Feb. 12, 2025 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a... Read More

WALTHAM, Mass., Feb. 03, 2025 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced that, effective February 1, 2025, the company granted non-qualified stock options to purchase an aggregate of 83,400 shares of its common stock to four new employees under Xilio... Read More

27% preliminary response rate observed in heavily pre-treated microsatellite stable colorectal cancer (MSS CRC) patients without liver metastases Responses were accompanied by decreases in levels of carcinoembryonic antigen (CEA) and circulating tumor DNA (ctDNA) and improvement in clinical symptoms Data continue to demonstrate differentiated safety and tolerability profile for the combination with low incidence of... Read More

WALTHAM, Mass., Jan. 17, 2025 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced that, effective January 1, 2025, the company granted a non-qualified stock option to purchase 60,000 shares of its common stock to one new employee under Xilio Therapeutics’ 2022... Read More

WALTHAM, Mass., Jan. 10, 2025 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced that, effective January 1, 2025, the company granted a non-qualified stock option to purchase 375,000 shares of its common stock to Caroline Hensley, its newly hired Chief Legal... Read More

Announces preliminary Phase 1 data for XTX301, a tumor-activated IL-12, demonstrating an improved tolerability profile over historical data for rhIL-12, with no dose-limiting toxicities Completed additional private placement with Gilead for purchase of remaining equity investment in connection with XTX301 partnership WALTHAM, Mass., Dec. 19, 2024 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage... Read More

WALTHAM, Mass., Dec. 16, 2024 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced the appointment of Caroline (Holda) Hensley as chief legal officer. “Caroline is an accomplished lawyer and biotechnology executive who brings a wealth of experience advising public... Read More

WALTHAM, Mass., Dec. 03, 2024 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced that, effective December 1, 2024, the company granted non-qualified stock options to purchase 8,400 shares of its common stock to one new employee under Xilio Therapeutics’ 2022... Read More

Combination of vilastobart and atezolizumab demonstrated encouraging early evidence of anti-tumor activity, including unconfirmed partial responses observed in two patients with difficult-to-treat, immunologically “cold” tumors Complete resolution of a metastatic liver lesion observed in a patient with microsatellite stable colorectal cancer (MSS CRC) Safety data indicated combination of vilastobart and atezolizumab was... Read More

Will present initial Phase 1C dose escalation data for vilastobart (XTX101), a tumor-activated, Fc-enhanced anti-CTLA-4, in combination with atezolizumab, in a late-breaker poster presentation at the SITC Annual Meeting Expect to report initial Phase 2 data in microsatellite stable colorectal cancer (MSS CRC) for vilastobart in combination with atezolizumab in the fourth quarter of 2024 Expect to report Phase 1 data for... Read More

WALTHAM, Mass., Oct. 30, 2024 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced that initial data from its Phase 1C dose escalation of XTX101 (vilastobart) in combination with atezolizumab in patients with advanced solid tumors will be presented in a late-breaker... Read More

WALTHAM, Mass., Oct. 04, 2024 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced an upcoming poster presentation at the Society for Immunotherapy of Cancer (SITC) 39 th Annual Meeting taking place in Houston, Texas, from November 6-10, 2024. The company plans to... Read More

WALTHAM, Mass., Oct. 02, 2024 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced that, effective October 1, 2024, the Compensation Committee of the Board of Directors granted non-qualified stock options to purchase an aggregate of 101,000 shares of its common... Read More

WALTHAM, Mass., Aug. 28, 2024 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced that René Russo, Pharm.D., president and chief executive officer, will participate in a fireside chat at the Morgan Stanley 22 nd Annual Global Healthcare Conference on Wednesday,... Read More

Initiated enrollment in Phase 2 clinical trial of XTX101, a tumor-activated, Fc-enhanced anti-CTLA-4, in combination with atezolizumab in patients with microsatellite stable colorectal cancer (MSS CRC) Initiated enrollment in Phase 1B monotherapy dose expansion for XTX301, a tumor-activated IL-12, in patients with advanced solid tumors; Phase 1A monotherapy dose escalation ongoing with no dose-limiting toxicities observed to... Read More

WALTHAM, Mass., June 13, 2024 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced the appointment of Aoife Brennan, M.D., and James Shannon, M.D., to the company’s board of directors. “On behalf of the entire board of directors, it is a privilege to welcome Aoife... Read More

Expect to initiate Phase 2 trial for XTX101, a tumor-activated, Fc-enhanced anti-CTLA-4, in combination with atezolizumab in patients with microsatellite stable colorectal cancer (MSS CRC) in the third quarter of 2024 Plan to report clinical data for XTX101 and XTX301, a tumor-activated IL-12, in the fourth quarter of 2024 Advancing research-stage pipeline of tumor-activated bispecifics and immune cell engagers Anticipate... Read More

On track with plans to initiate Phase 2 trial for XTX101, a tumor-activated, Fc-enhanced anti-CTLA-4, in combination with atezolizumab in patients with microsatellite stable colorectal cancer (MSS CRC) in the third quarter of 2024 Granted Gilead exclusive license to develop and commercialize XTX301, a tumor-activated IL-12 Anticipates cash runway into the second quarter of 2025 WALTHAM, Mass., April 01, 2024 (GLOBE NEWSWIRE)... Read More

Announces strategic portfolio reprioritization focused on rapid advancement of clinical-stage programs for XTX301, a tumor-activated, IL-12, and XTX101, a tumor-activated, Fc-enhanced anti-CTLA-4, and leveraging the company’s promising research platform for tumor-activated bispecific and cell engager molecules Reports additional Phase 2 data for XTX202, a tumor-activated, beta-gamma biased IL-2, supporting potential as... Read More

Gilead Granted Exclusive License to Xilio’s Tumor-Activated IL-12 Program, Including XTX301, a Clinical-Stage IL-12 Molecule with Potential to Treat a Broad Range of Cancers FOSTER CITY, Calif. and WALTHAM, Mass., March 28, 2024 (GLOBE NEWSWIRE) -- Gilead Sciences, Inc. (Nasdaq: GILD) and Xilio Therapeutics, Inc. (Nasdaq: XLO) today announced an exclusive license agreement to develop and commercialize Xilio’s Phase 1... Read More

WALTHAM, Mass., Feb. 28, 2024 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced that René Russo, Pharm.D., president and chief executive officer, will participate in the “Novel Immuno-Oncology” panel discussion during the TD Cowen 44 th Annual Health Care... Read More

WALTHAM, Mass., Jan. 31, 2024 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced that René Russo, Pharm.D., president and chief executive officer, will participate in a fireside chat at the Guggenheim 6 th Annual Biotechnology Conference on Wednesday, February 7,... Read More

Dosing XTX301 at 45 ug/kg once every three weeks (dose level 3) in ongoing Phase 1 trial, nearly 100x the maximum tolerated dose of rhIL-12, with no dose-limiting toxicities observed to date Initiated patient dosing in Phase 1/2 trial for XTX101, a tumor-activated, Fc-enhanced anti-CTLA-4, in combination with atezolizumab Based on recently accelerated enrollment, now plan to report Phase 2 trial data for XTX202, a... Read More

Phase 1 combination dose escalation expected to support planned Phase 2 trial in microsatellite stable colorectal cancer (MSS CRC) Updated Phase 1 monotherapy data for XTX101 at the recommended Phase 2 dose (RP2D) continues to demonstrate minimal treatment-related adverse events, consistent with tumor-activated molecule design, and a 33% disease control rate across a range of late-line and IO refractory advanced solid tumors... Read More

Demonstrated initial clinical validation of tumor-selective activation technology for both XTX101, a tumor-activated, Fc-enhanced anti-CTLA-4, and XTX202, a tumor-activated, beta-gamma IL-2 On track to activate trial sites for XTX101 dose escalation in combination with atezolizumab under clinical collaboration with Roche in the fourth quarter of 2023 Reported initial Phase 1/2 data for XTX202, including a 50% disease control... Read More

Initial evidence of dose-dependent disease control rate with 50% disease control rate at higher doses (≥2.8 mg/kg) and 31% disease control rate across all dose levels in a range of solid tumor types, including cold tumors Treatment-related adverse events primarily Grade 1-2 at doses up to 4 mg/kg administered once every three weeks in outpatient setting, with no reported signs or symptoms of vascular leak syndrome Two... Read More

WALTHAM, Mass., Oct. 31, 2023 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced that it will host an investor conference call and webcast on November 6, 2023 at 8:00 a.m. ET to review progress across its pipeline of tumor-activated molecules, including Phase 1/2... Read More

WALTHAM, Mass., Sept. 27, 2023 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced upcoming poster presentations at the Society for Immunotherapy of Cancer (SITC) 38 th Annual Meeting, taking place in San Diego, California from November 1-5, 2023. The company plans... Read More

WALTHAM, Mass., Sept. 05, 2023 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced the promotion of Katarina Luptakova, M.D., to the role of chief medical officer and Scott Coleman, Ph.D., to the role of chief development officer, each effective as of September 5,... Read More

WALTHAM, Mass., Sept. 05, 2023 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced that René Russo, Pharm.D., chief executive officer, will participate in a fireside chat at the Morgan Stanley 21 st Annual Global Healthcare Conference on Monday, September 11, 2023,... Read More

Xilio entered into clinical trial collaboration with Roche to evaluate XTX101, a tumor-activated, Fc-enhanced anti-CTLA-4, in combination with atezolizumab (Tecentriq®), in patients with microsatellite stable (MSS) colorectal cancer Xilio to host live virtual program spotlighting XTX101 on Thursday, August 17, 2023, at 12:30 p.m. ET Anticipate reporting preliminary Phase 1/2 data for XTX202, a tumor-activated IL-2, in early... Read More

WALTHAM, Mass., Aug. 03, 2023 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology therapies for people living with cancer, today announced the promotion of Chris Frankenfield to chief operating officer of Xilio. “Chris has played an integral strategic leadership role in supporting the growth and evolution of Xilio as a... Read More

Encouraging preliminary anti-tumor activity observed in a patient with PD-L1 negative advanced non-small cell lung cancer Favorable preliminary safety profile for XTX101 observed at the recommended Phase 2 dose of 150 mg once every six weeks WALTHAM, Mass., May 25, 2023 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a clinical-stage biotechnology company discovering and developing tumor-activated immuno-oncology... Read More

Initiated Phase 2 clinical trial for XTX202, a tumor-activated IL-2 Anticipate reporting preliminary Phase 1 safety, PK, PD, and anti-tumor activity data for XTX101, a tumor-activated, Fc-enhanced anti-CTLA-4, in the second quarter of 2023 Ended first quarter of 2023 with $93.3 million in cash and cash equivalents, with cash runway anticipated into the end of the second quarter of 2024 WALTHAM, Mass., May 09, 2023 (GLOBE... Read More

WALTHAM, Mass., April 03, 2023 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a biotechnology company developing tumor-activated immuno-oncology therapies for people living with cancer, today announced that the Compensation Committee of the Board of Directors granted a non-qualified stock option to purchase 55,000 shares of common stock to Kevin Brennan, the company’s newly hired Senior Vice President, Finance... Read More

Initial clinical data from XTX101, XTX202 and XTX301 clinical trials anticipated in 2023 XTX202, a tumor-activated IL-2, demonstrated preliminary clinical pharmacodynamic evidence of tumor-selective activation, providing initial clinical platform validation Anticipate initiating Phase 2 monotherapy clinical trial for XTX202 in melanoma and renal cell carcinoma in April 2023 Ended 2022 with $120.4 million in cash and cash... Read More

WALTHAM, Mass., Feb. 27, 2023 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a biotechnology company developing tumor-activated immuno-oncology therapies for people living with cancer, today announced its participation in the following upcoming investor conferences: Cowen 43 rd Annual Healthcare Conference on Monday, March 6, 2023, at 9:10 a.m. ET as part of a discussion called Novel Immuno-Oncology (IO)... Read More

WALTHAM, Mass., Feb. 16, 2023 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a biotechnology company developing tumor-activated immuno-oncology therapies for people living with cancer, today announced that René Russo, Pharm.D., chief executive officer, will participate in Citi’s 2023 Virtual Oncology Leadership Summit on Thursday, February 23, 2023, at 9:00 a.m. ET. A live webcast of the presentation can be... Read More

WALTHAM, Mass., Feb. 02, 2023 (GLOBE NEWSWIRE) -- Xilio Therapeutics, Inc. (Nasdaq: XLO), a biotechnology company developing tumor-activated immuno-oncology therapies for people living with cancer, today announced that René Russo, Pharm.D., chief executive officer, will participate in a fireside chat at the Guggenheim Healthcare Talks Oncology Day on Thursday, February 9, 2023, at 3:55 p.m. ET in New York. A live webcast of... Read More