ALA-PDT in Patients With CIN2 in p16-positivity and High-risk HPV Infection

Inclusion Criteria: * Premenopausal women, 18-45 years of age * Satisfactory the colposcopy examination (cervical transformation zone types: Type 1 or 2) at screening, and CIN2 as verified by cervical biopsy and p16-positivity within the last 3 months * Intense desire to retain the cervical structure or function * High-risk (including probably/possibly carcinogenic) HPV-DNA (i.e. 16, 18, 26, 31, 33, 35, 39, 45, 51, 52, 53, 56, 58, 59, 66, 68, 73 or 82) positive within the last 3 months * Meet the following conditions: pregnancy test negative; no pregnancy plan during the trial;no sexuality or reliable contraceptive measures taken since last menstruation to the onset of the study, agreeing to adopt reliable contraceptive measures during the study * Signed written informed consent Exclusion Criteria: * Atypical glandular cells (AGS) or adenocarcinoma in situ (AIS) on cytology ,or malignant cells on cytology or histology, or other suspicion of either micro-invasive or invasive disease * Invasive carcinoma possibility or lesions extending to the vaginal wall * Severe pelvic inflammatory disease, severe cervicitis, or other severe gynaecological infection as per clinical examination * Undiagnosed vaginal bleeding within the last 3 months * With allergic disease at present; known or suspected porphyria; known allergy to ALA or analogues * With serious cardiovascular, neurologic, psychiatric, endocrine, hematological disease; immunocompromised conditions or long-term glucocorticoid or immunosuppressants exposure; patients with malignant tumors within the last 5 years * Hepatic or renal functions abnormal (alanine aminotransferase or aspartate transaminase \> 3 upper limit of normal \[ULN\], or total bilirubin \> 1.5 ULN, or serum creatinine or blood urea nitrogen \> 1.5 ULN) * History of treatment with systemic antivirals (continued for ≥ 14 days) within the last 3 months * Pregnancy or nursing * Participation in any clinical studies within the last 30 days * Poor compliance or inability to complete the trial * Subjects that the investigators judged to be not suitable to participate the study besides above