The samples were processed using standard histopathological methods and evaluated by a certificated pathologist. All patients were staged according to the International Federation of Gynecology and Obstetrics (FIGO) staging system 2009 [12 (link)]. The abnormal cell percentage was calculated by selecting the area where the lesion was most representative on the slide and counting at high magnification (× 400) out of 100 cells. Only these regions with abnormal tissue were used for DNA extraction.
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