To evaluate the effectiveness and obstetric outcomes after laser conization for cervical intraepithelial neoplasia.

This retrospective study included 757 patients who underwent laser conization between 2014 and 2020. Patients with a diagnosis of invasive lesions or adenocarcinoma in situ were excluded. Histological data from the conization specimen, pre and postoperative histological and virological data (Human PapillomaVirus (HPV) test) and obstetric outcomes were collected from the medical record. The primary endpoint was the negative surgical margin rates after laser conization. The secondary endpoint were the size of the operative specimen, the postoperative virological test results (3 to 6 months after surgery), factors associated with negative or positive margin and postoperative obstetric outcomes (prematurity). Patient characteristics and outcomes were compared using Student's t-test, χ² test, or Fisher exact test. Values of p ≤ 0.05 were considered significant.

This study included 757 patients. Negative surgical margins were obtained in 76.1% of the cases and were associated with more negative HPV tests at 6 months (64.9% vs. 52.5%, p = 0.006) and fewer repeat surgeries (0.2% vs. 2.2%, p = 0.013) than for patients with positive margins. Among the patients under 43 years at the time of conization, 71 achieved a pregnancy with a term >22 weeks, and of these 66 (93%) delivered at term (≥37 weeks).

Laser conization appears to be an effective technique for the management of cervical intraepithelial neoplasia both in terms of the quality of the resection margins and the obstetric prognosis.