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Learn MoreIn order to delineate the molecular mechanisms leading to the therapeutic effect of BI 853520 on primary tumor growth, mice harboring 4T1 primary tumors were treated for five days with BI 853520, and RNA extracted from total tumors was subjected to next generation sequencing. Only primary tumors with sufficient RNA quality were included into further analysis (Suppl. Fig. 2A). Gene expression correlation analysis displayed a clear separation of transcriptomic profiles derived from primary tumors of mice treated with BI 853520 or vehicle (Suppl. Fig. 2B). Comparative gene expression analysis of primary tumors of mice treated with BI 853520 versus vehicle control revealed 1293 upregulated and 475 downregulated genes (cutoffs: p-value 0.05, fold change +/- 1.5). Functional enrichment analysis for biological processes and signaling pathways indicated that the regulation of epithelial cell proliferation, positive regulation of cell cycle/cell proliferation/cell division and regulation of cell proliferation/cell division/cell growth were enriched in genes downregulated by BI 853520 treatment (Fig. 3A). In line with this finding, gene set enrichment analysis confirmed a significant reduction in the relative expression of genes important for cell cycle and positive regulation of mitotic cell cycle (including cyclin-dependent kinase 1 and 4; Cdk1: log2 fold-change= -0.4519, FDR= 4.24e-03; Cdk4: log2 fold-change= -0.3072, FDR= 0.003718), while the negative regulation of cell proliferation was increased following BI 853520 treatment (Fig. 3C; Suppl. Fig. 2C). SOURCE: Robert IvanekBioinformatics University of Basel
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