• Data demonstrate that SOT101 monotherapy and SOT101 in combination with pembrolizumab have a favorable safety profile
  • Encouraging efficacy signals were observed for both SOT101 monotherapy and SOT101 in combination with pembrolizumab, even in patients with checkpoint-inhibitor relapsed and refractory tumors
  • 15 out of 19 patients receiving SOT101 in combination with pembrolizumab had observed clinical benefit across all dose-levels  
  • Updated results will be presented as an oral presentation at this year’s ASCO meeting by Dr. Elena Garralda from the Vall D’Hebron Institute of Oncology, Barcelona, Spain
  • AURELIO-04, a global Phase 2 study trial of SOT101 in combination with pembrolizumab in six distinct tumor types is expected to start in the coming weeks

BASEL, Switzerland I May 26, 2022 I SOTIO Biotech, a clinical stage immuno-oncology company owned by PPF Group, announces updated interim safety and efficacy data from its Phase 1/1b AURELIO-03 dose escalation study of the IL-2/IL-15 receptor βγ superagonist, SOT101, as monotherapy and in combination with pembrolizumab in patients with advanced solid tumors. Data from the study show that SOT101 has a favorable safety profile. The recommended Phase 2 dose was defined at 12 µg/kg SOT101.

The AURELIO-03 study is an open label, single arm Phase 1/1b dose escalation study to determine the recommended Phase 2 dose and to evaluate the preliminary efficacy of SOT101 in patients with advanced solid tumors either as a monotherapy or in combination with pembrolizumab. SOT101 is administered subcutaneously on days 1, 2, 8, and 9 of every three-week cycle. 30 patients were treated on monotherapy dose levels 0.25 to 15 μg/kg and twenty-one patients on combination therapy dose levels 1.5 to 12 μg/kg.

Interim results of SOT101 as a monotherapy demonstrated four patients pretreated with checkpoint inhibitor (CPI) with confirmed stable disease. A partial response was confirmed in one patient with skin squamous cell carcinoma whose tumor was CPI-refractory. The preliminary efficacy is currently being further evaluated in an ongoing monotherapy extension in skin squamous cell carcinoma, melanoma, and renal cell cancer.

In 19 patients with at least one post-baseline tumor assessment across all dose levels who were treated with SOT101 in combination with pembrolizumab, one complete response in a patient with mesothelioma, four partial responses and 10 confirmed stable diseases have been reported.

The adverse event profile of SOT101 in combination with pembrolizumab was in line with the adverse event profile of either compound as monotherapy. No additive toxicity was seen when combining SOT101 with pembrolizumab. For both monotherapy and combination treatment, the recommended Phase 2 dose of SOT101 was established at 12 μg/kg.

This data will be presented by principal investigator Dr. Elena Garralda from the Vall D’Hebron Institute of Oncology, Barcelona, Spain at the 2022 American Society of Clinical Oncology (ASCO) Annual Meeting in Chicago, Illinois on Saturday, June 4, 2022.

“Despite decades of progress in clinical oncology, the difficulty of treating solid tumors has remained a significant challenge for physicians,” said Radek Spisek, M.D., Ph.D., chief executive officer of SOTIO. “Given the promising results from our first-in-human study of SOT101, we are greatly encouraged to have observed excellent preliminary safety and efficacy data both as a monotherapy and in combination with pembrolizumab. We look forward to initiating a basket study of SOT101 in combination with KEYTRUDA to evaluate efficacy and safety in patients with selected advanced or refractory solid tumors. This large Phase 2 AURELIO-04 trial in collaboration with MSD will be initiated in the coming weeks.”

Dr. Garralda added: “The patients in this study are some of the hardest to treat, some with up to nine prior lines of therapy, so the clinical benefit observed in the AURELIO-03 study is especially encouraging. These data highlight the potential impact of SOT101 on the treatment landscape for solid tumors.”

The presentation from ASCO will be made available on the SOTIO Biotech website after the time of presentation.

About SOT101:

SOT101 (SO-C101) is a subcutaneously administered IL-15R superagonist that is fused to the sushi+ domain of the IL-15 receptor α chain. SOT101 has demonstrated strong preclinical in vivo efficacy in various tumor models showing increased long-term survival and tumor regression, as well as a favorable toxicology profile. SOT101 has been shown in pre-clinical models to synergize with checkpoint inhibitors and antibody therapies exerting ADCC.

About SOTIO Biotech

SOTIO Biotech is shaping the future of cancer immunotherapies by translating compelling science into patient benefit. The robust SOTIO clinical pipeline includes a differentiated superagonist of the attractive immuno-oncology target IL-15, SOT101, currently being tested in phase II clinical trials. SOT102, a next generation Claudin18.2-targeted antibody-drug conjugate (ADCs) has recently entered clinical phase. Two programs will enter phase I clinical testing within 2022, including SOT201, an IL-15-based immunocytokine and BOXR1030, a GPC3-targeted CAR-T based on proprietary technology designed to improve on the efficacy of CAR T therapies in the tumor microenvironment. SOTIO is a member of the PPF Group. For more information, please visit the company’s website at www.sotio.com.