Resistance Mechanisms and Their Regulation in Lung Cancer

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Abstract
Data obtained from multiple sources indicate that no single mechanism can explain the drug resistance and the poor prognosis of patients with lung cancer. The resistance-related proteins P-glycoprotein, glutathione-dependent enzymes, topoisomerase II, metallothioneins, O-6-alkylguanine-DNA alkyltransferase, thymidylate synthase, dihydrofolate reductase and heat shock proteins have been found in lung carcinomas, but these alone cannot explain the drug-resistant phenotype. Cell cycle-related proteins, angiogenic factors, protooncogenes, and tumor suppressor genes also play a role in the phenotype that is resistant lung cancer. A key future challenge involves determining the relative quantitative contributions of each of these mechanisms to overall resistance.

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