HSIL, High-Grade Squamous Intraepithelial Lesions

This study aims to learn more about anal cancer risk in men who have sex with men (MSM) who are using Pre-Exposure Prophylaxis (PrEP) to prevent HIV. Specifically, we want to check how common High-Grade Squamous Intraepithelial Lesions (HSIL) are in this group, how well anal swabs can screen for these lesions, and how having HSIL affects their quality of life. We'll also test if DNA methylation testing can give us extra information about the lesions. The main questions the study aims to answer are: * How common are HSIL in MSM using PrEP? * How accurate are anal swabs for detecting HSIL in this group? * How does having HSIL affect the quality of life of MSM using PrEP? * Can DNA methylation testing help improve our understanding of HSIL in these individuals? Participants will: * Answer questions about their health and quality of life. * Have an anal smear collected for testing. * Undergo High-Resolution Anoscopy (HRA) to check for HSIL and get a biopsy if deemed necessary.

The goal of this clinical trial is to identify the immunophenotypic profile of the local immune response, the cervicovaginal microenvironment and the microbiological profile of women with CIN 3 treated with imiquimod. Participants will be divided in 3 groups: CIN 3 who will use 16 doses of imiquimod in the uterine cervix, applied twice a week and will be treated with LEEP procedure; 2) patients with CIN 3 who will undergo standard treatment with LEEP procedure; 3) patients with negative cytology and HPV (human papillomavirus) test. Blood and cervicovaginal lavage collections will be performed at different times, for comparisons between cellular response profiles to imiquimod during treatment and baseline levels in healthy patients.

Clinically, cervical precancerous lesion is one of the important diseases that endanger the life safety and fertility of young women. Women with histopathologically confirmed CIN2 need regular HPV, cervical cytology, and colposcopic biopsy if necessary to assess the outcome and progression of the disease. In this study, we intend to visit Fujian Maternal and Child Health Hospital, Tongji Hospital affiliated to Tongji Medical College of Huazhong University of Science \& Technology and other hospitals, including 300 CIN2 participants aged 45 and below diagnosed by histopathology, and collect the remaining cervical secretions and cervical exfoliated cell samples after clinical examination, even if you do not participate in this clinical study. In clinical diagnosis, treatment and follow-up, it is also necessary to collect the above specimens for relevant medical tests. Therefore, it is of great clinical and scientific significance to explore the role of HPV integrated detection in predicting the prognosis of young women with CIN2.