DNA damaged by ionizing radiation in tumor cell

The term "DNA in tumor cells damaged by ionizing radiation" does not refer to a single canonical molecule, gene, protein, or receptor. Instead, it describes the state of genomic material within cancer cells that has sustained structural lesions—such as single-strand breaks and double-strand breaks—following exposure to ionizing radiation. Ionizing radiation is widely used as an anti-cancer therapy because it induces lethal forms of DNA damage that can trigger cell death if left unrepaired. The most critical and cytotoxic form is the double-strand break. Cells respond through complex networks known collectively as the DNA Damage Response (DDR). This includes activation of signaling cascades for cell cycle arrest and apoptosis and recruitment/activation of multiple specific enzymatic pathways for direct lesion repair—most notably homologous recombination and non-homologous end joining for DSBs[1][2][5]. Therapeutically, this "target" is exploited indirectly; drugs such as PARP inhibitors block specific DDR components so that tumor cells accumulate irreparable genetic lesions after radiotherapy or chemotherapy. Biomarkers like γH2A.X are used clinically to monitor DSBs. However, since this entry refers broadly to a type or state rather than a discrete molecular entity with defined structure/function relationships typical for drug targets (like receptors or enzymes), it should be flagged as an incorrect target name per standard conventions—it lacks specificity and cannot be mapped directly onto structured databases without further clarification. Note: This entry should be considered incorrect under strict target nomenclature guidelines because it does not represent a unique molecule but rather describes any form(s) of damaged genomic material resulting from irradiation within malignant tissue[1][4].

Other names

DNA damage in cancer cellsRadiation-induced DNA lesionsIR-damaged DNADouble-strand breaks (DSBs) in tumor cellsDDR substrates in cancer

Inhibition of DNA repair pathways to increase cytotoxicity from unrepaired damage[1][3]; Induction of synthetic lethality in cells with defective homologous recombination repair[3]