Risk factors for progression or persistence of squamous intraepithelial lesions diagnosed during pregnancy

This study aimed to assess the risk of progression/persistence of squamous intraepithelial lesions (SILs) during pregnancy according to the age of the woman, the grade of the lesion, the type of human papillomavirus (HPV) infection, and the mode of delivery.Eighty pregnant women with abnormal cytologic result at the first antenatal visit were evaluated. Postpartum cytologic and histologic findings were compared with the antepartum findings.There were 40 patients with low-grade SIL and 40 with high-grade SIL (HSIL). The overall regression rate was 32.5%. There were 19 patients 25 years or younger and 61 patients older than 25 years. The regression rate among younger patients was 52.6% versus 26.2% among those older than 25 years (relative risk [RR] = 2.01, 95% confidence interval [CI] = 1.10-3.66). The regression rate was 45% in the group of low-grade SIL and 20% in the group of HSIL (RR = 2.25, 95% CI = 1.11-4.57). In patients with HSIL, those older than 25 years had a 2-fold increased risk of progression/persistence than younger patients. High-risk HPV-positive samples were typed in 44 cases, 21 of which (47.7%) were positive for HPV-16. The regression rate was 9.5% for HPV-16-positive cases and 52.2% for HPV-16-negative cases (RR = 5.48, 95% CI = 1.39-21.68). The risk of progression or persistence of the lesion according to mode of delivery did not show significant differences (RR = 1.15, 95% CI = 0.82-1.63).Age of the patient older than 25 years, HSILs, and HPV type 16 infection are risk factors for the progression or persistence of intraepithelial lesions of the cervix in the postpartum period.