DNA Damage, Mutagenesis and Cancer.
Level 5 - mechanism / opinion, no new human data
Narrative review summarizing mechanisms of DNA damage and carcinogenesis without systematic methodology.
PubMed 29570697 · doi:10.3390/ijms19040970
What was done
Narrative mini-review synthesizing mechanisms by which physical agents (such as UV light and gamma-radiation) and chemical carcinogens induce DNA damage, the role of DNA repair and replication fidelity, and the multi-step pathway of carcinogenesis spanning initiation, promotion, and progression.
What was found
The abstract reports no quantitative metrics, effect estimates, or sample numbers. It describes the qualitative sequence wherein high-frequency DNA lesions escape repair, lead to replication-mediated mutations in oncogenes, tumor-suppressor genes, or cell-cycle regulators, and establish clonal cell populations with proliferative advantages that manifest clinically after chronic exposure (such as tobacco-induced lung cancer).
Why it matters
It outlines the canonical multi-stage framework linking environmental genotoxic exposures, cellular repair failures, and driver mutations to neoplastic development.
Limits
As a narrative review, it presents no original empirical data, quantitative synthesis, or systematic search methodology. Specific exposure thresholds, repair kinetics, and quantitative cancer risk estimates are not provided in the abstract.
Cited by
- supports Smoking causes chemicals to enter the lungs that induce DNA damage and increase the accumulation of genetic mutations.