الفهرس 
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Abstract
Aim of the Study
1- To detect P53 expression in clinically normal oral mucosa of shisha smokers, cigarette smokers, simultaneous smokers and non-smokers, as a surrogate marker for field cancerization.
2- To detect CYFRA 21-1 levels in salivary samples of shisha smokers, cigarette smokers, simultaneous smokers and non-smokers, as a surrogate marker for field cancerization.