Objective: To evaluate the efficacy of the automated screening system FocalPoint for cervical cytology quality control (QC) rescreening. False-negative rates (FNRs) were evaluated by a multi-institutional retrospective study.
Study Design: Cervical cytology slides that had already been reported as negative for intraepithelial lesion or malignancy (NILM) were chosen arbitrarily for FocalPoint rescreening. Slides stratified into the highest 15% probability of being abnormal were rescreened by a cytotechnologist. The slides that were abnormal were reevaluated by a cytopathologist to be false negatives.
Results: Rescreening of 12,000 slides, i.e. 9,000 conventional slides and 3,000 liquid-based cytology (LBC) slides, was performed; 9,826 (7,393 conventional and 2,433 LBC) were satisfactory for FocalPoint (2,174 were determined unsatisfactory) and those within the highest 15% of probability (1,496, i.e. 1,123 conventional and 373 LBC) were rescreened. As a result, 117 (96 conventional and 21 LBC) were determined as abnormal (other than NILM) and the FNR was 1.19%. Among these 117 slides, 40 (35 conventional and 5 LBC) were determined as high-grade squamous intraepithelial lesion and greater (HSIL+).
Conclusion: Of 117 (1.19%) abnormal slides detected, 40 (0.41%) were determined to be HSIL+. This result suggests that FocalPoint is effective for QC rescreening of cervical cytology.
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