Comparative study of topical 5-aminolevulinic acid photodynamic therapy and surgery in treating vaginal high-grade squamous intraepithelial lesions following hysterectomy

To compare the clinical efficacy and safety of 5-aminolevulinic acid photodynamic therapy (ALA-PDT) and surgery in treating vaginal high-grade squamous intraepithelial lesions (HSIL) after hysterectomy due to cervical cancer (CC) or precancerous lesions. A retrospective study was performed comprising 41 women with histologically confirmed vaginal HSIL after hysterectomy for CC or cervical HSIL. Patients were treated with surgery or ALA-PDT and were followed up at 3, 6 and 12 months and then every six months afterwards. Clinical data were collected and the efficacy and safety of the two groups were analyzed. Of the 41 patients with vaginal HSIL after hysterectomy, 18 were treated with ALA-PDT and 23 underwent surgery. There was no significant difference in the lesions' complete remission (CR) rate or the human papillomavirus (HPV) clearance rate between the ALA-PDT group and the surgery group (P>0.05). In the surgery group, the clearance rate of HPV16/18 was higher than that of other high-risk HPV (HR-HPV) and HPV16/18 combined with other HR-HPV (87.50% vs. 45.45% vs. 0.00%, P=0.014). No significant difference in the recurrence rate between the two groups was noted (P>0.05). And none of the patients progressed. In the surgery group, one patient developed significant thickening of the vaginal stump, and one patient had increased vaginal discharge. In women treated with ALA-PDT, there was no vaginal bleeding or harmful effects on the organizational structure or functions compared to the surgery group. The efficacy of ALA-PDT was comparable to that of surgery in treating vaginal HSIL following hysterectomy due to CC or cervical HSIL, with fewer side effects.