Detection of High-Grade Lesions on Cell Blocks from Residual Fluids of Pap Smears Diagnosed as Low-Grade Abnormalities: A Preliminary Pilot Study

Abstract

Objective: To investigate the feasibility of the technique of cell blocks (CBs) from residual fluids of Papanicolaou (Pap) smears diagnosed as low-grade abnormalities in the detection of high-grade lesions on biopsies. Study Design: In the present pilot study, we evaluated the sensitivity and specificity of 70 CBs from liquid-based cervicovaginal smears of women with atypical squamous cells (ASCs) of undetermined significance (ASCUS; n = 39), ASCs that cannot exclude high-grade squamous intraepithelial lesion (ASC-H; n = 17) and low-grade squamous intraepithelial lesions (LSILs; n = 14) in the detection of cervical intraepithelial neoplasia (CIN) type 2+ lesions. Results: Of the 70 CBs, 22 were diagnosed as negative, 27 as CIN1 and 21 as CIN2+. The sensitivity and specificity of CB preparation for the diagnosis of CIN2+ lesions were 50 and 100%, respectively, in ASCUS, 92 and 100%, respectively, in ASC-H, 100 and 100%, respectively, in LSILs. Conclusions: Our study confirms that CB preparation is a simple and reproducible technique with a good specificity that could be added advantageously to Pap smears to detect CIN2+ lesions in women with ASCs and LSILs.