In the absence of LMD-specific therapeutic guidelines for HER2-driven NSCLC, treatment was initiated with trastuzumab deruxtecan (Enhertu), based on extrapolated evidence from clinical trials in systemic NSCLC and HER2-positive breast cancer with central nervous system involvement. Other options such as poziotinib and zongertinib were considered but not pursued. This case underscores the urgent need for inclusive clinical trials addressing CNS complications in molecularly defined NSCLC and demonstrates the real-world application of precision oncology beyond trial populations.

Despite effective HER2-targeted treatments of peripheral HER2+ breast cancer with trastuzumab and HER2 inhibitors, limited brain permeability renders these treatments inefficient for HER2+ breast cancer brain metastasis (BCBM)...The clinical receptor tyrosine kinase inhibitor (RTKi) lapatinib blocked phosphorylation of all ErbB receptors (ErbB1-4) and induced the intrinsic apoptosis pathway in BCBM94...Two weeks of poziotinib treatment successfully ablated BCBM94 and BT474 HER2+ brain tumors in vivo. In conclusion, this study established a patient-derived HER2+ BCBM model and identified poziotinib as highly efficacious RTKi with excellent brain penetrability that eliminated HER2+ BCBM.

"Treatment of Ba/F3 or lung cells expressing MDK::ERBB2 with ERBB2 inhibitors (afatinib, poziotinib, tucatinib) blocked phosphorylation of ERBB2 and downstream effectors, and inhibited growth of both cell lines. ERBB2 fusions are rare oncogenic drivers that are candidates for targeted therapy. The subset of recurrent ERBB2 fusions with C-terminal/3' partners may represent an alternative mechanism of fusion oncogenicity."

Our study revealed EGFR-dependent and -independent mechanisms of mobocertinib resistance in patients with advanced EGFR Ex20ins-mutant NSCLC.

A total of 1,418 EGFR E20ins mutations were collected from six studies (FoundationInsights, Geneseeq Technology Inc, mobocertinib phase I/II trial, poziotinib phase II trial, sunvozertinib phase I trial, and Samsung Medical Center) and reorganised according to Human Genome Variation Society (HGVS) nomenclature. To ensure comprehensive coverage in real-world settings, it is essential to standardise the annotations for each variant, for example using the HGVS nomenclature. The accurate classification and analysis of drug responsiveness in EGFR E20ins necessitate consideration of the nomenclature, particularly with respect to the locations where the actual mutations occur.

P2; Trial completion date: Sep 2024 --> Dec 2025 | Trial primary completion date: Sep 2024 --> Dec 2025

P2, N=648, Terminated, Spectrum Pharmaceuticals, Inc | Trial completion date: Dec 2023 --> Apr 2023 | Active, not recruiting --> Terminated; Strategic business decision (unrelated to safety)

Additionally, we confirmed that dacomitinib inhibits chemoresistance in paclitaxel-resistant ovarian cancer HeyA8-MDR cells. Collectively, our research indicated that dacomitinib effectively resensitized paclitaxel in SKOV3-TR cells by inhibiting EGFR signaling and elevating intracellular ROS levels.

We found four compounds:1D6-Foretinib GSK1363089; 15F6-Poziotinib (HM781-36B); 15F9-Dasatinib monohydrate; 15A10-Pexmetinib (ARRY-614); acts as potent inhibitors of necroptosis (Necroptosis Blocking Compounds, NBCs) by blocking the RIPK3 kinase activity. In our study, we explored the role of NBCs in neuroprotection after traumatic brain injury. It's effectiveness in traumatic brain injury animal models and favorable safety profiles make it a potential candidate for the advances of new therapies for necroptosis-associated neuroinflammatory disorders.

Molecular docking indicated strong binding of poziotinib and olmutinib to extrinsic and intrinsic apoptotic pathway markers, with binding energies of -9.4 kcal/mol and -8.5 kcal/mol, respectively, on interacting with STK-11. Combining poziotinib and olmutinib therapies may significantly improve drug tolerance and conquer drug resistance more effectively than using them individually in lung cancer patients, as suggested by this study's mechanisms.

Treatment with the tyrosine kinase inhibitor (TKI) neratinib as a single agent continues to be evaluated in HER2-mutant metastatic disease. Herein, we discuss the under-explored effects of individual HER2 mutant alleles on therapeutic response, a role for HER2 mutation in metastatic propensity, and differences in patient outcomes in ER+ invasive lobular carcinoma (ILC) versus invasive ductal carcinoma (IDC). The preclinical efficacy of additional agents is also discussed, particularly the pan-HER inhibitor poziotinib.

HER2 mutations drive the growth of a subset of breast cancers and are targeted with HER2 tyrosine kinase inhibitors (TKI) such as neratinib...Cells expressing double HER2 mutations exhibited resistance to most HER2 TKIs but retained sensitivity to mobocertinib and poziotinib...Double-mutant cells showed enhanced MEK/ERK signaling, which was blocked by combined inhibition of HER2 and MEK. Together, these findings reveal the driver function of secondary HER2 mutations in resistance to HER2 inhibition and provide a potential treatment strategy to overcome acquired resistance to HER2 TKIs in HER2-mutant breast cancer.