Lung cancer brain metastases
Classification
Staging studies
Tumor microenvironment
Sun et al. applied single-cell RNA sequencing to profile immune and nonimmune cells in 4 glioma and 10 lung cancer samples.
The analysis revealed that tumor microenvironment (TME) cells are present in heterogeneous subpopulations. Lung cancer reprogrammed cells into immunosuppressed state, including microglia, macrophages, endothelial cells, and CD8+ T cells, with unique cell proportions and gene signatures. Particularly, they identified that a subset of macrophages was associated with poor prognosis. ROS (reactive oxygen species)-producing neutrophils was found to participant in angiogenesis. Furthermore, endothelial cells participated in active communication with fibroblasts. Metastatic epithelial cells exhibited high heterogeneity in chromosomal instability (CIN) and cell population.
Findings provide a comprehensive understanding of the heterogenicity of the tumor microenvironment and tumor cells and it will be crucial for successful immunotherapy development for lung cancer intracranial metastases 1).