Defining hrHPV genotypes in cervical intraepithelial neoplasia by laser capture microdissection supports reflex triage of self-samples using HPV16/18 and FAM19A4/miR124-2 methylation

Gynecol Oncol. 2018 Nov;151(2):311-318. doi: 10.1016/j.ygyno.2018.09.006. Epub 2018 Sep 13.

Abstract

Objective: HPV16/18 genotyping and detection of hypermethylation of human cell genes involved in cervical oncogenesis have shown promising results in triage of high-risk HPV (hrHPV)-screen positive women on cervical smears. These tests can be performed on self-samples, which contain cervical and vaginal cells. We studied whether a self-sample represents the hrHPV type causing the worst cervical lesion and whether any differences in hypermethylation of FAM19A4/miR124-2 exist between CIN lesions caused by different hrHPV types. These results have important implications for reflex triage of self-samples.

Methods: Correlation between genotype found on self-sample using GP5+/6+-PCR-EIA-LMNX and causative hrHPV genotype in the worst lesion on histology was studied using laser capture microdissection (LCM)-SPF10-PCR (N = 152). Hypermethylation of FAM19A4/miR124-2 in the self-sample was tested in a quantitative methylation specific PCR and compared between lesions caused by HPV16/18 and other hrHPV genotypes.

Results: Causative hrHPV genotype of the worst lesion (CIN1, CIN2, CIN3, invasive cervical cancer) was detected on self-sample in 93.4%. HPV16 was the most frequently found genotype on self-sampling (39.2%, 73/186) and causative genotype in CIN3+ (51.4%, 38/74, all detected on self-sample). There were no differences in the percentages of positive FAM19A4/miR124-2 methylation assays between lesions caused by HPV16/18 (73.8% in CIN3+) or other hrHPV genotypes (66.7% in CIN3+) (p = 0.538).

Conclusions: Our results show that hrHPV genotypes found on self-sample were a good representation of hrHPV in the worst CIN lesion and that methylation testing on self-sample for detection of CIN3+ was not significantly different between lesions caused by HPV16/18 and other hrHPV genotypes.

Keywords: Cervical cancer; Cervical intraepithelial neoplasia; Human papillomavirus; Methylation; Self-sampling; Triage.

MeSH terms

  • Adult
  • Biopsy
  • Cervical Intraepithelial Neoplasia / genetics
  • Cervical Intraepithelial Neoplasia / metabolism
  • Cervical Intraepithelial Neoplasia / pathology
  • Cervical Intraepithelial Neoplasia / virology*
  • Cytokines / genetics
  • Cytokines / metabolism*
  • DNA Methylation
  • Female
  • Genotype
  • Human papillomavirus 16 / genetics*
  • Human papillomavirus 18 / genetics*
  • Humans
  • Laser Capture Microdissection
  • MicroRNAs / genetics
  • MicroRNAs / metabolism*
  • Middle Aged
  • Papillomavirus Infections / genetics
  • Papillomavirus Infections / metabolism
  • Papillomavirus Infections / pathology
  • Papillomavirus Infections / virology*
  • Uterine Cervical Neoplasms / genetics
  • Uterine Cervical Neoplasms / metabolism
  • Uterine Cervical Neoplasms / pathology
  • Uterine Cervical Neoplasms / virology*

Substances

  • Cytokines
  • MIRN124 microRNA, human
  • MicroRNAs
  • TAFA4 protein, human