On April 13, 2021 Iterion Therapeutics, Inc., a venture-backed, clinical stage biotechnology company developing novel cancer therapeutics, reported that it has confirmed the safety of Tegavivint, a novel, potent and selective nuclear beta-catenin inhibitor, after completing enrollment and dosing the final patient in a multicenter Phase 1/2a dose expansion clinical study of Tegavivint in patients with desmoid tumors (Press release, Iterion Therapeutics, APR 13, 2021, View Source [SID1234577997]).

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Nuclear beta-catenin is a highly-studied oncology target associated with numerous cancer types. Tegavivint is unique among nuclear beta-catenin inhibitors in that it binds to TBL1 (Transducin Beta-like Protein One), a novel downstream target in the Wnt-signaling pathway. As such, Tegavivint enables silencing of Wnt-pathway gene expression without affecting other Wnt/beta-catenin functions in the cell membrane, thus avoiding toxicity issues common to other drugs in this pathway.

The Phase 1/2a clinical trial of Tegavivint in patients with progressive desmoid tumors was designed as an open-label, non-randomized dose-finding study. The primary objectives of the study were to evaluate the safety and tolerability of Tegavivint. Secondary objectives were to determine the durability of response (DOR) to Tegavivint after the achievement of best response. The total study enrolled 24 patients. During the dose expansion portion of the trial 16 of these patients were treated with a recommended Phase 2 dose (RP2D) that was established based on pharmacokinetic exposure levels and clinical responses in a recently completed Phase 1 study.

Data from patients treated in the dose expansion portion of the trial reaffirmed Tegavivint’s safety at the RP2D level. No dose-limiting toxicities or significant adverse events were observed. This data will enable Iterion to accelerate clinical activity in additional cancer indications where nuclear beta-catenin signaling has been identified as a potential therapeutic target, including AML, NSCLC, and certain pediatric cancers. Iterion expects to initiate clinical programs investigating Tegavivint for these indications in 2021.

"We have seen very good tolerability with no dose-limiting toxicities and no significant adverse events in escalating clinical doses," said Casey Cunningham, Chief Medical Officer of Iterion. "We are seeing a very strong safety signal in patients who have been on Tegavivint for over a year and are also observing tumor activity in patients. We continue to follow the patients that are still receiving treatment and look forward to sharing efficacy results at an upcoming medical conference."

Rahul Aras, CEO of Iterion, stated: "The completion of enrollment in the dose expansion phase of our desmoid tumor clinical trial and demonstration of safety and clinical activity at the RP2D represent important milestones in our clinical development of Tegavivint. We look forward to advancing the clinical development of Tegavivint in desmoid tumors as this disease target is greatly underserved. The results of this study also provide a ‘green light’ to initiate clinical development of Tegavivint in additional, high-value cancer settings, including AML, NSCLC, and certain pediatric cancers, that are characterized by nuclear beta-catenin overexpression."

About Desmoid Tumors

Desmoid tumors are rare, non- metastasizing sarcomas that overexpress nuclear beta-catenin, a historically "undruggable" oncology target implicated in cell proliferation, differentiation and immune evasion. An estimated 1,500 patients in the US are newly diagnosed with desmoid tumors each year. Desmoids are most commonly diagnosed in young adults between 30-40 years of age and are associated with significant morbidities, including severe pain, disfigurement, internal bleeding and organ damage, range of motion loss and, in rare cases, death. Iterion has received Orphan Drug Designation for Tegavivint to treat desmoid tumors, a disease for which there are no FDA approved therapies.