Photodynamic therapy effectively palliates gynecologic malignancies

Abstract

Background: There is a need for novel therapies for women with recurrent gynecologic malignancies. In this paper, the authors report their experience with photodynamic therapy (PDT). PDT involves administering a systemic injection of Photofrin II, a selective tumor photosensitizer hematoporphyrin derivative, followed by exposure of tumor tissue to visible light at 630 nm. The photodynamic destruction of tumor exhibits both cytocidal and vascular effects that may contribute to the tumoricidal effects observed.

Materials and methods: Patients were injected intravenously with two mg/kg Photofrin II. Approximately 48 hours post-injection, the tumor was exposed to red light (wavelength 630 nm +/- 2 nm) from a laser through a flexible 400-um quartz fiber with an attached microlens to produce a spot of uniform intensity and/or diffuser tip fiber to uniformly illuminate the cavity.

Results: Thirty-two patients with recurrent gynecologic malignancies were treated with photodynamic therapy using Photofrin II dye and laser. A total of 45 PDT treatments were given; 25 patients received only one treatment, five patients received two treatments, two patients received three treatments, and one patient received four treatments. There were nine cervical, six vulvar, six vaginal, five ovarian, five endometrial carcinomas, and one recurrent pagets of the anal canal. Nine out of 11 (82%) patients with metastatic cutaneous lesions had a complete response. Five out of 21 patients (24%) with vaginal, cervical or anal recurrences had a complete response to therapy with median response time of 28 months. Toxicity associated with treatment was limited to burning sensation, pain, and edema at treatment site. There were no treatment related deaths.

Conclusions: PDT is an effective therapy in patients with recurrent gynecologic malignancies and limited treatment options. PDT is an alternative therapy that offers the possibility of complete response in select groups of patient populations. Specifically, it provides palliation for superficial recurrent lesions of skin, cervix, vagina and vulva, in the absence of distant disease.