zipalertinib (CLN-081)

P2, N=16, Not yet recruiting, Jonsson Comprehensive Cancer Center

P3, N=272, Recruiting, Taiho Oncology, Inc. | Trial completion date: Aug 2026 --> May 2027 | Trial primary completion date: Jul 2026 --> Oct 2026

In vitro studies show that afatinib, poziotinib, and zipalertinib more potently inhibited near-loop than far-loop insertions, whereas mobocertinib has similar IC50 in both groups. In comparison, in the previously published EXCLAIM trial (NCT02716116), mobocertinib demonstrates similar activities across both groups in tumor size reduction (-38.5% vs. -34.1%, p = 0.59) and PFS (12.0 vs. 13.0 months, p = 0.99). Therefore, EGFRex20ins location differentially impacts the sensitivity of TKIs.

P3, N=360, Recruiting, Taiho Oncology, Inc.

P2, N=220, Recruiting, Taiho Oncology, Inc. | N=160 --> 220

Zipalertinib demonstrated clinically meaningful efficacy with a manageable safety profile in patients with EGFR ex20ins-mutant NSCLC who received prior platinum-based chemotherapy with or without amivantamab.

For EGFR exon 20 insertion mutation positive NSCLC, results from REZILIENT-1, a single arm phase II study with zipalertinib, were presented, showing an objective response rate (ORR) of 50% in patients that were pretreated with amivantamab, and 25% in patients pretreated with amivantamab and an EGFR exon 20 insertion-directed TKI...For ALK, results from ALKOVE-1, a single arm phase I/II study with NVL-655, a next generation ALK TKI, were presented. The ORR was 35 % in patients pretreated with ≥ 2 ALK TKIs including lorlatinib and 57 % in patients pretreated with ≥ 1 ALK TKI, excluding lorlatinib...In addition, results of the first-line randomized phase III INSPIRE study were presented, in which iruplinalkib, an ALK and ROS1 selective TKI, is being evaluated versus crizotinib...Finally, results from ARROS-1, a single arm phase I/II study with zidesamtinib, a ROS1 selective and TRK-sparing TKI, were presented. An ORR of 73% was obtained in patients that were pretreated with crizotinib and an ORR of 38% in patients pretreated with repotrectinib. In this review, we will discuss the relevant study results presented at ESMO 2024 for these three genomic drivers and hypothesize on their respective place in the sequence of treatment options.

P1/2, N=284, Active, not recruiting, Cullinan Therapeutics Inc. | Trial completion date: Dec 2024 --> Mar 2026 | Trial primary completion date: Dec 2024 --> Jan 2026

P2, N=160, Recruiting, Taiho Oncology, Inc. | Active, not recruiting --> Recruiting | Trial completion date: Oct 2025 --> Aug 2026 | Trial primary completion date: Jun 2025 --> Feb 2026

Data suggest that combining chemotherapy with EGFR inhibitors offers promise for EGFR ex20ins-mutated NSCLC. REZILIENT3 is an ongoing phase III study evaluating the efficacy and safety of zipalertinib (an orally available, irreversible EGFR-TKI) plus first-line standard-of-care platinum-based chemotherapy with chemotherapy alone in previously untreated patients with nonsquamous NSCLC harboring EGFR ex20ins mutations.Clinical Trial Registration: NCT05973773 (ClinicalTrials.gov).

P2, N=160, Active, not recruiting, Taiho Oncology, Inc. | Recruiting --> Active, not recruiting

Biochemical, structural, and cellular studies of a diverse panel of EGFR inhibitors revealed that the more recently developed compounds BAY-568, TAS6417, and TAK-788 inhibit EGFR insASV and insSVD in a mutant-selective manner, with BAY-568 being the most potent and selective versus wild-type (WT) EGFR. Cocrystal structures with WT EGFR reveal the binding modes of each of these inhibitors and of poziotinib, a potent but not mutantselective inhibitor, and together they define interactions shared by the mutant-selective agents. Collectively, our results show that these exon20 insertion variants are not inherently inhibitor resistant, rather they differ in their drug sensitivity from WT EGFR. However, they are similar to each other, indicating that a single inhibitor should be effective for several of the diverse exon 20 insertion variants.