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Biomédica

Print version ISSN 0120-4157

Abstract

GAMBOA, Óscar  and  INC CERVICAL CANCER SCREENING STUDY GROUP et al. Visual techniques for cervical cancer screening in Colombia. Biomédica [online]. 2019, vol.39, n.1, pp.65-74. ISSN 0120-4157.  http://dx.doi.org/10.7705/biomedica.v39i1.4007.

Introduction:

Direct visual inspection for cervical cancer screening remains controversial, whereas colposcopy-biopsy is considered the gold standard for diagnosis of preneoplastic cervical lesions.

Objectives:

To determine the rates of cervical intraepithelial neoplasia grade 2 or more and of false positives for colposcopy and direct visual inspection.

Materials and methods:

Women aged 25-59 underwent direct visual inspection with acetic acid (VIA), Lugol’s iodine (VIA-VILI), and colposcopy. Punch biopsies were obtained for all positive tests. Using histology as the gold standard, detection and false positive rates were compared for VIA, VIA-VILI, and colposcopy (two thresholds). Sensitivity and false positive ratios with the corresponding 95% confidence intervals were estimated.

Results:

We included 5,011 women in the analysis and we obtained 602 biopsies. Positivity rates for colposcopy high-grade and low-grade diagnosis were 1.6% and 10.8%. Positivity rates for VIA and VIA-VILI were 7.4% and 9.9%. VIA showed a significantly lower detection rate than colposcopy with low-grade diagnosis as the threshold(SR=0.72; 95% CI0.57-0.91), and significantly lower false positive rate (FPR=0.70; 95% CI 0.65-0.76). No differences between VIA-VILI and colposcopy low-grade threshold were observed. VIA and VIA-VILI showed significantly higher detection and false positive rates than colposcopy high-grade threshold. Sensitivity rates for visual inspection decreased with age and false positive rates increased. For all age groups, false positive rates for VIA and VIA-VILI were significantly higher than colposcopy.

Conclusions:

Detection rates for VIA-VILI similar to colposcopy low-grade threshold representa chance to reduce cervical cancer mortality through see-and-treat approaches among women with limited access to health care. Lower detection rates suggest reviewing high-grade colposcopy findings as the threshold for biopsy incertain settings.

Keywords : Uterine cervical neoplasms; mass screening; sensitivity and specificity; colposcopy; Colombia.

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