Efficacy and Safety of Photodynamic Therapy for Cervical Intraepithelial Neoplasia 3(CIN3):A Multicenter Prospective Cohort Study
Phase: NA
Conditions: Precancerous Cervical Lesion
Sponsor: Peking University Third Hospital

Efficacy and safety of photodynamic therapy
for cervical intraepithelial neoplasia
3(CIN3):A multicenter prospective cohort
study
Study protocal
2025.5

Program design
[ Design of the study methodology ]
The aim of this project is to study the efficacy and safety of photodynamic
therapy (20% 5-aminolivulonic acid +630nm red light) in the treatment of
cervical intraepithelial neoplasia 3(CIN 3) in women in real-world applications.
[ Eligibility, exclusion and withdrawal criteria ]
Inclusion Criteria:
-CIN3, photodynamic therapy was required,
-type 1 2 transformation area, colposcopy was sufficient
-the lesion boundary was completely visible
-The ECC did not indicate high-grade lesions
Exclusion Criteria:
-coexistence or suspicion of cancer;
-TCT HSIL
-involving glands
-Porphyria patients, or suspected allergic to red and blue light.
-severe medical comorbidities；
Withdrawal Criteria:
- The subject requested to withdraw from the clinical trial;
- Those who experienced serious adverse events during the trial;
- Those whose conditions have progressed during the trial and are not suitable to
continue with this research protocol;
- The researcher or/and sponsor consider that the patient does not meet the
experimental requirements and is not suitable to continue participating in this study.
[ Study duration and follow-up ]
The specific implementation steps are as follows:
After enrollment, the subjects signed the informed consent form and made an
appointment for the first treatment time. No treatment was given 3 days before and
after menstruation.
For the first treatment, after the patient ate, the bladder was emptied, the
lithotomy position of the bladder was taken, the cervix was exposed with a endoscope,
the vaginal secretions of the cervix were wiped with a dry gauze ball, 20%

aminolevulonic acid photosensitizer (5-ALA) was applied to the lesion site, a cotton
condom was stuffed into the vagina, and the patient was instructed to sit still and wait
for 3-4 hours. Avoid activities during this period, reduce walking and urination. Four
hours later, the patient lay on the examination bed again and was irradiated with red
light at 630-635nm. After the treatment is completed, observe for half an hour. If there
is no discomfort, you can leave the hospital. Before leaving, an adverse reaction
record card will be issued. Make an appointment for treatment 7 days later. If it falls
during menstruation, it will be postponed by one week.
For the 2nd and 3rd treatments, the parameters and energy density are the same
as those of the first one. The treatment interval is 7 days. If it falls during the
menstrual period, it will be postponed by one week.
One month after the end of the third treatment, colposcopy was performed. If the
suspected lesion worsened, a biopsy was taken. If no abnormalities are found under
colposcopy, a single-point biopsy is taken at the most severe site of the original lesion.
If the biopsy indicates that the lesion persists, continue the treatment for three times.
TCT+HPV was reexamined 6 months after the start of the first treatment. If the lesion
worsens, the patient will be referred for surgical resection in accordance with the
diagnosis and treatment norms.
Data management
1. Data Entry
Data collection will be obtained by team staff via the Case Report Form (CRF). As a
part of the clinical data management system, the case report form for data collection is
jointly negotiated and prepared by the project leader and the clinical epidemiology
Research Center, and the experts are invited to discuss and modify it for use. The data
collation process includes automated validation procedures and manual validation to
ensure the completeness and accuracy of the data entered into the case report form.
When the data does not match, the data can be queried, and the team staff can verify
and modify the entered data.
2. Contents and methods of data verification and management
According to the data entered in the case report form, medical supervision is
conducted regularly to ensure the accuracy of data entry, and medical problems are
discussed separately.
3. Data Archiving

After data entry and verification are completed as required, the case report form shall
be filed and stored in numbered order, and be filled with a retrieval catalogue for
reference. Electronic data files, including databases, inspection programs, analysis
programs, analysis results, coding and explanatory files, should be classified and
stored in different disks or recording media with multiple backups, properly stored to
prevent damage. All original files shall be kept for the period specified accordingly.
Statistical analysis
Based on the assessment of traditional Chinese medicine practitioners in prospective
clinical trials combined with the treatment intentions of patients, various control
groups were formed. Appropriate clinical research methods were selected for
statistical analysis.