denfivontinib (SKI-G-801)

To discover next-generation FLT3 inhibitors and gather additional structure-activity relationship (SAR) information, we performed structural modifications of G-749 (denfivontinib) utilizing structure simplification and scaffold hopping strategies...Furthermore, it significantly reduced reactive oxygen species (ROS) production and mitochondrial membrane potential (MMP), and strongly inhibited FLT3-mediated signaling pathways. These findings, along with the obtained SAR information, provide valuable insights for the further development of FLT3 inhibitors.

To demonstrate the extent to which our findings reflect clinical results, we analyzed bulk-RNA sequencing data from 21 NSCLC patients undergoing anti-PD-1 immunotherapy. The NLRP3 inflammasome score influenced enhanced immune responses in patient data undergoing anti-PD-1 immunotherapy, suggesting a role for NLRP3 inflammasome in activating immune responses during treatment.

P1, N=36, Active, not recruiting, Oscotec Inc. | Recruiting --> Active, not recruiting

P1, N=14, Completed, Oscotec Inc. | Unknown status --> Completed | N=40 --> 14

In this study, we examined the effect of AXL inhibitors on immune activation and tumor growth in TC1 and C3PQ mouse tumor models, in the context of clinical immunotherapy/chemotherapy and maintenance treatment, using an aPD-1 with/without pemetrexed. These results suggest increased infiltration of T cells, consistent with previous studies using AXL inhibitors. It is expected that the results from this study will serve as a stepping stone for clinical research to improve the existing standard of care.

SKI-G-801 significantly suppressed tumor metastasis and growth by enhancing anti-tumor immune responses. Our results suggest that SKI-G-801 has the potential to overcome anti-PD-1 therapy resistance and allow more patients to benefit from anti-PD-1 therapy.

G-749, a potential TAM receptor tyrosine kinase inhibitor, and its derivative SKI-G-801, effectively inhibits the phosphorylation of AXL at nanomolar concentration (IC = 20 nM)...In addition, we demonstrated that G-749 inhibits the signaling pathway associated with cell proliferation in colon cancer cell lines HCT15 and SW620, as well as tumor xenograft mouse models. We propose G-749 as a new therapeutic agent for the treatment of colon cancer caused by abnormal TYRO3 expression or activity.

A novel AXL inhibitor, SKI-G-801 drives priming of professional antigen-presenting cells and tumor-infiltrating T cells, leading to immunological synapsis for tumor killing, which is significantly enhanced by the combination with pembrolizumab. These results suggest the inhibition of AXL signal pathway by SKI-G-801 could confer a solid rationale for clinical investigation of lung cancer cells.