Multicenter Prospective Non-randomized Controlled Study of ALA-PDT for LSIL With HPV16/18 Infection

Inclusion Criteria: 1. Female, 20-60 years, understands study procedures and consents to participate; 2. HPV 16 or 18 positive; 3. Colposcopy-guided cervical biopsy within 3 months showing LSIL; 4. Provides written informed consent. Exclusion Criteria: 1. Cytology showing ASC-H, HSIL, AGC, or AIS; or evidence of malignant cells on cytology/histology, or suspicion of malignancy or invasive cancer; 2. Colposcopy findings suggestive of invasive cancer or lesion extension to the vaginal wall; 3. Severe pelvic, cervical, or other gynecological inflammatory conditions identified clinically; 4. Undiagnosed vaginal bleeding; 5. Active allergic disease, porphyria, or history of allergy to the study drug or structurally similar agents; 6. Severe cardiovascular, neurological, psychiatric, endocrine, hepatic, or hematologic disorders; known immunodeficiency; long-term glucocorticoid or immunosuppressant use; active autoimmune disease; or other malignancies; 7. Pregnant or breastfeeding women; 8. History of hysterectomy, cervical cancer treatment, or cervical excision/ablation within 6 months (e.g., conization, LEEP, laser); 9. Use of interferon or antiviral therapy within 3 months; 10. Any other condition deemed unsuitable for participation by the investigator.