CCNE1 and cervical squamous intraepithelial neoplasia: Our analysis revealed that CCNE1 amplification is rare in cervical cancer (< 1%), which is consistent with findings from a study [19] conducted in a low- and middle-income country, where CCNE1 expression was significantly upregulated during the progression from cervical intraepithelial neoplasia (CIN) to invasive carcinoma.