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A case–control study consisting of 300 patients and an equal number of healthy controls was carried out to investigate the association of polymorphism in cytochrome P450 2C19 (CYP2C19), which results in poor and extensive metabolizers (PMs and EMs) genotypes, with squamous cell carcinoma of head and neck (HNSCC) and treatment response in patients receiving combination of chemo-radiotherapy. A higher...
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