Leep Procedure - for abnormal pap (cervical dysplasia) In minutes, we can remove pre cancerous lesions from your cervix. The LEEP procedure replaces the traditional cone biopsy, shaving the abnormal tissues away. Over 90% of patients are cured in a single treatment. The loop electrosurgical excision procedure (LEEP) is used when you have pre cancerous cells on the surface of the cervix. This does not mean you have cancer, but treatment of the abnormal area is important to prevent the cells from progressing into invasive cervical cancer.