Metastatic clear-cell renal cell carcinoma: a frequent NOTCH1 mutation predictive of response to anti-NOTCH1 treatment

Abstract

Background Despite some improvement in the prognosis of metastatic clear-cell renal cell carcinoma (ccRCC), the identification of new therapeutic targets is essential. Up to now, only limited genomic data has been obtained from metastatic samples. Methods We aimed to characterize metastatic ccRCC by way of whole-genome analyses of metastatic formalin-fixed samples, using OncoScan® technology. We identified a frequent, unexpected pL1575P NOTCH1 mutation which we set out to characterize for translational purposes. We thus implemented patient-derived xenografts from metastatic samples of human ccRCC to explore its clinical significance . Results We showed that pL1575P NOTCH1 mutation was an activating mutation, leading to the expression of NOTCH1-intracellular domain-active fragments in both cancer cells and tumor endothelial cells, suggesting a trans-differentiation of cancer cells into tumor micro-vessels. We demonstrated that this mutation could be used as a predictive biomarker of response to CB-103, a specific NOTCH1-ICD inhibitor. One striking result was the considerable anti-angiogenic effect, coherent with the presence of NOTCH1 mutation in tumor micro-vessels. Conclusions We identified a frequent, unexpected pL1575P_c4724T_C NOTCH1 mutation as a new biomarker for ccRCC metastases, predictive of response to the CB103 NOTCH1-intracellular domain inhibitor. This opens the way for further clinical trials among patients with metastatic RCCs.

Cell type‐specific molecular mechanisms and implications of necroptosis in inflammatory respiratory diseases

“…Endothelial cells are essential for controlling and regulating inflammatory response 100,101 . TNF‐α functions as an essential effector associated with ALI severity 102,103 .…”

“…Endothelial cells are essential for controlling and regulating inflammatory response. 100,101 TNF-α functions as an essential effector associated with ALI severity. 102,103 As excessively activated epider- MLKL in endothelial cell necroptosis during ARDS.…”