Tumor cells with high nucleotide pools and activated EGFR-Ras pathways

The term "Tumor cells with high nucleotide pools and activated EGFR-Ras pathways" describes a specific oncogenic phenotype rather than a single molecular target. This cellular state is characterized by the constitutive activation of the Epidermal Growth Factor Receptor (EGFR) and the Ras-MAPK signaling cascade, which drives increased glucose flux into the pentose phosphate pathway and de novo nucleotide biosynthesis. This metabolic reprogramming results in abnormally high intracellular nucleotide pools, which are essential for rapid DNA replication and tumor proliferation. This phenotype creates unique therapeutic vulnerabilities. For instance, oncolytic viruses like Pelareorep selectively replicate in these cells because activated Ras signaling inhibits the antiviral Protein Kinase R (PKR) pathway, while the abundant nucleotide pools facilitate rapid viral genome synthesis. Additionally, these cells are often dependent on "sanitization" enzymes like MTH1 (NUDT1) to prevent the incorporation of oxidized nucleotides into DNA, making them sensitive to MTH1 inhibitors. Understanding this phenotype is critical for developing precision oncology strategies that target the intersection of signaling and metabolism.

Other names

Ras-driven cancer cellsEGFR-mutant cells with metabolic reprogrammingNucleotide-rich tumor phenotype

Selective viral replication in cells with impaired PKR signaling (due to Ras activation) and high dNTP availability; inhibition of nucleotide pool sanitization (MTH1) to induce lethal DNA damage.