On April 20, 2026 Verismo Therapeutics, a clinical-stage CAR T cell therapy company pioneering a novel multichain KIR-CAR platform technology, reported the first clinical results from its ongoing Phase 1 STAR-101 clinical trial (NCT05568680) evaluating SynKIR-110 KIR-CAR living medicine in patients with advanced mesothelin-expressing solid tumors, including ovarian cancer, mesothelioma, and cholangiocarcinoma. These late-breaking data were presented during the Clinical Trial Plenary session 3 at the American Association for Cancer Research (AACR) (Free AACR Whitepaper) Annual Meeting 2026 in San Diego, CA (Abstract CT 104).
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"We are excited to share Verismo’s first presentation of clinical data evaluating our multi-chain SynKIR-110 KIR-CAR candidate, showing a positive safety profile, dose-dependent efficacy signals, and no dose-limiting toxicities," said Laura Johnson, Ph.D., Chief Operating Officer and Chief Scientific Officer of Verismo Therapeutics. "These data represent an important milestone for Verismo’s KIR-CAR platform, which is designed to combine the best of natural killer and T cells to fight cancer and may provide a more durable response than current single-chain CAR T therapies that are prone to exhaustion in difficult-to-treat solid tumor microenvironments."
Janos L. Tanyi, M.D., Ph.D., Principal Investigator for STAR-101 and Professor at the Perelman School of Medicine at the University of Pennsylvania (Penn), presented the data from nine patients treated across three dose-escalation cohorts. SynKIR-110 in dose level cohorts 1 through 3 showed a favorable safety profile, with no dose-limiting toxicities, no high-grade (Gr3+) cytokine release syndrome (CRS), and no immune effector cell-associated neurotoxicity syndrome (ICANS) events observed.
The initial data showed on-target biologic activity based on KIR-CAR T cell expansion and persistence in patients and serum cytokine changes after SynKIR-110 infusion. Anti-tumor activity was observed at increased dose levels, with 1 of 3 patients at dose level 3 achieving a partial response per RECIST criteria that was ongoing after 3+ months at the interim data cut-off for this dataset, which was September 2025. The trial remains ongoing, with continued enrollment to evaluate safety and determine the recommended Phase 2 dose.
"These data are significant because patients with mesothelin-expressing solid tumors continue to face significant and urgent needs for better treatments," said Dr. Tanyi, who is an associate professor of Obstetrics and Gynecology at Penn. "The safety profile we have observed, including low grade (Gr 1-2) CRS in only 3 of 9 patients, and no neurotoxicity, combined with early signs of clinical activity, support continued investigation of this novel approach in patients with solid tumors."
About SynKIR-110 KIR-CAR and the STAR-101 Clinical Trial
SynKIR-110 KIR-CAR is an investigational autologous engineered cell therapy developed using Verismo’s KIR-CAR platform. This approach utilizes a multi-chain, split-signaling architecture derived from natural killer cells, designed to drive long-term anti-tumor T cell function without T cell exhaustion. By keeping antigen recognition separate from T cell activation, the multi-chain architecture is intended to sustain T cell activity even in challenging solid-tumor microenvironments.
The STAR-101 clinical trial is a first-in-human, multicenter, open-label Phase 1 study in the U.S., designed to evaluate the safety, feasibility, and preliminary efficacy of SynKIR-110 in patients with advanced mesothelin-expressing solid tumors, including ovarian cancer, mesothelioma, and cholangiocarcinoma. These target indications are associated with poor prognosis and remain areas of high unmet medical need. The STAR-101 trial follows a dose-escalation design with an expansion cohort at the recommended Phase 2 dose. Patient recruitment and dose escalation in the trial is ongoing.
(Press release, Verismo Therapeutics, APR 20, 2026, View Source [SID1234664570])