Mexican Cervical Cancer Screening Study II: 6-month and 2-year follow-up of HR-HPV women treated with cryotherapy in a low-resource setting

J Low Genit Tract Dis. 2014 Oct;18(4):333-7. doi: 10.1097/LGT.0000000000000029.

Abstract

Objective: To determine the efficacy and tolerance of cryotherapy in a visual inspection with acetic acid (VIA) triage protocol after primary human papillomavirus (HPV) screening in a low-resource setting.

Materials and methods: This continuous series conducted over 2 years enrolled nonpregnant, high-risk HPV (HR-HPV)-positive women between the ages of 30 and 50 years, who resided in the state of Michoacán, Mexico, and had a history of no Pap smear screening or knowledge of Pap smear results within the last 3 years. These women were initially enrolled in the Mexican Cervical Cancer Screening Study II (MECCS II) trial and were treated with cryotherapy after VIA triage. They subsequently followed up at 6 months and 2 years for repeat VIA, colposcopy, and biopsy.

Results: A total of 291 women were treated with cryotherapy, of whom 226 (78%) followed up at 6 months. Of these 226 women, 153 (68%) were HR-HPV-negative; there were no findings of cervical intraepithelial neoplasia grade 2 (CIN2) or worse. The remaining 73 women (32%) were HR-HPV-positive; of these women, 2 had CIN2 and 3 had CIN3. Only 137 women followed up at 2 years. Of these 137 women, 116 were HR-HPV-negative and 21 were HR-HPV-positive. Of the 21 women positive for HR-HPV, 9 had negative biopsy results, 11 had CIN1, and 1 had no biopsy. The clearance rate of HR-HPV was 83% (95% confidence interval: 0.78-0.87). There were no biopsy findings of CIN2 or worse at 2 years. Before cryotherapy, of the 226 women, 15 (6.6%) were positive for endocervical curettage (ECC) and 5 (2.2%) were referred for surgical management. Of these 15 ECC-positive women, 10 (67%) followed up at 6 months and it was shown that no patient was ECC positive at that time point. Moreover, of the 15 ECC-positive women, 11 (73%) followed up at 2 years and it was shown that no patient was ECC positive at that time point. In our study, VIA had a false-positive rate of 5%.

Conclusions: Cryotherapy was an effective, acceptable, and well-tolerated means of treating cervical dysplasia in a low-resource setting.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Biopsy
  • Colposcopy
  • Cryotherapy / adverse effects
  • Cryotherapy / methods*
  • Female
  • Follow-Up Studies
  • Histocytochemistry
  • Humans
  • Mexico
  • Middle Aged
  • Papillomavirus Infections / complications*
  • Treatment Outcome
  • Uterine Cervical Neoplasms / therapy*