Medical College of Wisconsin
CTSICores SearchResearch InformaticsREDCap

Safety and Acceptability of Three Ablation Treatments for High-Grade Cervical Precancer: Early Data From a Randomized Noninferiority Clinical Trial. JCO Glob Oncol 2022 Dec;8:e2200112



Pubmed ID


Pubmed Central ID




Scopus ID

2-s2.0-85144589856 (requires institutional sign-in at Scopus site)   1 Citation


PURPOSE: This ongoing trial is comparing the efficacy and safety of three ablation treatments for cervical intraepithelial neoplasia grade 2 or higher. Here, we present early data regarding pain, side effects, and acceptability of CO2 gas-based cryotherapy (CO2), nongas cryotherapy, and thermal ablation (TA). Efficacy results are expected to become available in late 2023.

MATERIALS AND METHODS: This noninferiority randomized trial is taking place in El Salvador, China, and Colombia. Patients are 1,152 eligible women with biopsy-confirmed cervical intraepithelial neoplasia grade 2 or higher who will receive one of three ablation treatments. Pain is measured before, during, and after treatment with a visual analog scale (1-10). Side effects and acceptability are assessed at 6 weeks.

RESULTS: To date, 1,024 of 1,152 (89%) women were randomly assigned to treatment. The median pain level was higher during TA (4, IQR = 4) than CO2 (2, IQR = 4) or nongas cryotherapy (2, IQR = 4) (P < .01, range: 0-10). The most common post-treatment symptom was watery discharge, reported by 97.9% of women, and it lasted longer in the CO2 group than the other two treatments (in days, median [IQR]: CO2 = 20[20], nongas cryotherapy = 15[10], TA = 18[15], P < .01). Bleeding was reported more frequently in women treated with TA (27.6%) than CO2 (17.5) or nongas cryotherapy (18.7%) (P < .01). The majority of patients reported being very satisfied with the treatment they received at 6 weeks (91%) and again at 12 months post-treatment (97%).

CONCLUSION: Despite differences in pain and side effects across ablation treatments, all were safe and highly acceptable to patients. In addition to efficacy, considerations such as cost and portability may be more significant in choosing a treatment method.

Author List

Soler M, Alfaro K, Masch RJ, Conzuelo Rodriguez G, Qu X, Wu S, Sun J, Hernández Jovel DM, Bonilla J, Puentes LO, Murillo R, Alonzo TA, Felix JC, Castle P, Cremer M


Juan Felix MD Vice Chair, Director, Professor in the Pathology department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Carbon Dioxide
Uterine Cervical Dysplasia
Uterine Cervical Neoplasms