お知らせ • Mar 28
Sensei Biotherapeutics, Inc. Reports Favorable Preliminary Dose Expansion Data for Solnerstotug in PD-(L)1 Resistant Tumors
Sensei Biotherapeutics, Inc. announced initial results from the dose expansion portion of its Phase 1/2 trial evaluating solnerstotug (formerly SNS-101), a conditionally active monoclonal antibody targeting VISTA (V-domain Ig suppressor of T cell activation). Phase 1 Dose Expansion Preliminary Results: The Phase 1 dose expansion trial is a multi-center, open-label, dose expansion study evaluating solnerstotug as monotherapy and in combination with Libtayo (cemiplimab), Regeneron’s PD-1 inhibitor, in both a basket of “hot” tumors that typically respond to immunotherapy but have progressed on prior PD-(L)1 therapy and a single “cold” tumor histology (microsatellite stable (MSS) CRC) that is typically unresponsive to immunotherapy. As of March 17, 2025, the study has enrolled 60 patients, including: 40 patients with “hot” tumors, including Non-Small Cell Lung Cancer (NSCLC), Head and Neck (H&N) cancer, Melanoma, Renal Cell Carcinoma (RCC), Merkel Cell Carcinoma (MCC), MSI-H Colorectal Cancer (CRC), and other tumor types. All patients received the combination of solnerstotug (3 mg/kg or 15 mg/kg) and cemiplimab. At the time of this data cut, 21 “hot” tumor PD-(L)1 resistant patients were considered evaluable for efficacy, having received at least one post-baseline scan. An additional 11 patients have not yet reached the first baseline scan, and an additional 8 patients discontinued the study prior to any post-baseline scan. 20 patients with PD-(L)1 non-responsive microsatellite stable (MSS) Colorectal Cancer (CRC) were included to assess potential activity in “cold” tumors. Of these patients, 10 were enrolled in a monotherapy (15 mg/kg) cohort and 10 received the combination of solnerstotug (15 mg/kg) and cemiplimab. 17 MSS CRC patients were considered evaluable for efficacy, having received at least one post-baseline scan. Three patients discontinued the study prior to any post-baseline scan. Key findings include: 14% ORR (3 patients) and 62% DCR (disease control rate) (13 patients) among 21 evaluable PD-(L)1 resistant “hot” tumor patients. Durable complete response (CR) in a MCC patient treated with 15 mg/kg solnerstotug + cemiplimab. Patient continues on treatment at 42+ weeks. Previously received a PD-(L)1 therapy for 15 months in the adjuvant setting prior to progressing on therapy. Partial response (PR) at Week 12 in a MCC patient treated with 15 mg/kg solnerstotug + cemiplimab. Patient continues on treatment at 12+ weeks. Previously received several lines of checkpoint therapy, including the combination of PD-1 and CTLA-4, with a best response of stable disease prior to progressing on therapy. Partial response (PR) at Week 36 in an MSI-H CRC patient treated with 15 mg/kg solnerstotug + cemiplimab. Patient had durable stable disease (SD) through the course of treatment before converting to a PR at Week 36. Patient continues on treatment at 36+ weeks. Previously received a PD-(L)1 therapy for more than 4 years, where the patient achieved a CR prior to progressing on therapy. Six PD-(L)1 resistant patients with SD remain on treatment past 12+ weeks, with tumor reductions ranging from 0% to 17%, suggesting durable disease control in a subset of patients. All PD-(L)1 resistant patients on study with tumor shrinkage remain on treatment, suggesting potential for prolonged benefit. None of the MSS CRC patients experienced a CR or PR, consistent with prior checkpoint therapy in this “cold” tumor type. Solnerstotug continues to be well tolerated, with no dose-limiting toxicities and the majority of AEs Grade 1 or 2 in severity. Out of 60 patients, there have been four (7%) cases of Grade 1 cytokine release syndrome (CRS), all mild and manageable. Two patients in the combination cohort experienced immune-mediated events. Patients who progress following treatment with PD-1 or PD-L1 inhibitors (“secondary resistance”) face a particularly poor prognosis, as resistance to immune checkpoint blockade is a significant challenge in oncology. According to the Society for Immunotherapy of Cancer (SITC), secondary resistance is defined as disease progression following an initial period of disease control. For patients who develop secondary resistance after treatment with PD-(L)1 immune checkpoint inhibitors, the likelihood of benefiting from a rechallenge with the same therapy is estimated to be 5% or less. Currently, treatment options for PD-(L)1 resistant tumors are limited, with many patients receiving chemotherapy, experimental therapies in clinical trials, or palliative care in the absence of effective alternatives. Existing immune checkpoint inhibitor (ICI) combination therapies have not been approved in this setting. They are either highly toxic, such as CTLA-4+PD-1 in which up to 40% of patients discontinue due to severe immune-related adverse events (irAEs), or offer limited treatment potential, such as LAG-3+PD-1 where the ORR has been 9-12%. Next Steps: Preparing for Phase 2Subject to raising sufficient capital, Sensei plans to initiate a Phase 2 study in first quarter of 2026, with the trial design and patient selection strategies to be informed by the ongoing dose expansion results. Further analyses, including biomarker-based patient selection, are underway to optimize the Phase 2 design.