Human Papillomavirus Genotype Attribution and Integration in High-Grade Vaginal Intraepithelial Neoplasia

Objective The aim of the study was to investigate the distribution and association between human papillomavirus (HPV) genotypes and integration as well as their correlation with cervical lesions. Methods Two hundred seven patients diagnosed with high-grade vaginal intraepithelial neoplasia (HG-VaIN) were recruited from the Women's Hospital School of Medicine Zhejiang University between 2015 and 2021 and assayed for HPV genotyping. HPV integration sequencing analysis was conducted using tissues from 53 patients with HG-VaIN and 4 patients with invasive vaginal carcinoma (IVC), along with paired cervical lesion specimens. Results A total of 207 patients with HG-VaIN were categorized as having cervical lesions unrelated to HG-VaIN (group A, 71 patients, 34.30%) or cervical lesion-related HG-VaIN (group B, 136 patients, 65.70%). With an average follow-up of 42.19 months, 12 of 153 patients progressed to IVC and were all from group B. HPV16 infection and the presence of cervical lesions were the 2 main factors associated with disease progression, with cervical lesion coexistence being an independent factor. Compared with group A (5/20, 25%), group B (17/33, 51.52%) showed a higher rate of HPV integration, as demonstrated using HPV integration sequencing analysis, with HPV16 being the most integrated genotype (72.73%). The integration analysis of 4 patients with IVC paired with cervical lesion specimens showed that 3 of the 4 pairs exhibited the same HPV infection and integration sites, indicating a high degree of homology in HPV integration between cervical lesions and HG-VaIN-induced IVC. Conclusions Patients with HG-VaIN associated with cervical lesions exhibited a higher risk of malignant transformation, necessitating more proactive treatment approaches.