Prediction of residual neoplasia based on histopathology and margin status of conization specimens

Objective: To evaluate the status of cone margins and the severity of cervical neoplasia as predictors of residual lesions in the remaining cervices. Methods: We performed a 7-year retrospective study and reviewed 172 patients who had undergone cervical conization followed by subsequent hysterectomy. Pathological findings of the cone margins and residual lesions in the postcone hysterectomy specimens were recorded for analysis. Results: The prevalence rates of positive cone margins were 0, 18.6, 23.8, and 25%, respectively, in patients with low-grade squamous intraepithelial lesion (SIL) (n = 6), high-grade SIL (n = 129), stage IA1 cervical cancer (CC-IA1) (n = 21), and CC-IA2 (n = 16). The prevalence rates of positive residual lesions in postcone hysterectomy specimens were 0, 23.3, 23.8, and 43.88, respectively, in those with low-grade SIL, high-grade SlL, CC-IA1, and CC-IA2. Residual lesions were significantly more frequently found in patients with positive cone margins (84.81) than in those with negative margins (10.1%) (chi(2) = 76.81, P < 0.0001). All six patients with low-grade SIL had free cone margins. Positive predictive values of margin status for the presence of residual lesions were 83.3, 80, and 100%, respectively, in patients with high-grade Sa, CC-IA1, aid CC-IA2. Only two (6.1%) of 33 patients with positive cone margins had more advanced residual lesions. Negative predictive values of margin status for the absence of residual lesions were 100, 90.5, 93.8, and 75%, respectively, in patients with low-grade SIL, high-grade SIL, CC-IA1, and CC-IA2. None of the 139 patients with negative margins had invasive residual lesion. Conclusions: (1) The prevalence of positive cone margin and residual lesion increased with higher severity of cervical neoplasia. (2) Patients with positive cone margins had significantly higher chances of having residual lesion than those with negative margins. (3) Free cone margin does not ensure the absence of residual lesion in the remaining cenix However, the possibility of residual invasive cancer in the remaining cervix is remote. (4) Positive cone margin does not invariably indicate the presence and persistence of more severe residual lesion. Subsequent hysterectomy may be reserved for the patient with invasive cone pathology, the patient with concomitant morbid uterine condition, or the patient who is not reliable for continuous follow-up. (C) 1996 Academic Press, Inc.