Objective: To retrospectively evaluate the efficacy of high-dose-rate brachytherapy of vaginal intraepithelial neoplasia with a special focus on analysis of toxicity.
Study Design: Twenty consecutive patients were irradiated with brachytherapy of vaginal intraepithelial neoplasia with component ca in situ (N=3). Late complications of the vagina graded using the CTCAE v.3.0. General assessment three-step scale was introduced for simplicity of analysis.
Results: The median age was 57 years (range: 28-80 years). The median follow-up time was 39 months (range: 14-115 months). Vaginal intraepithelial neoplasia recurrence was observed in 1 patient. The 3-year disease free survival rate was 90% (95% confidence interval [CI]: 71-100%). Observed late side effects: libido grades 1-2 in 15 (75%), vaginal discharge grade 2 (pad use indicated) in 2 (10%), dryness grade 2 (dyspareunia) in 7 (35%), mucositis grades 2-3 in 6 (30%), stenosis grades 2-3 in 7 (35%) and vaginitis grades 2-3 in 4 (20%) cases. General assessment was good in 9 (45%), average in 2 (10%), and bad in 9 (45%) patients. Treatment dose affected the toxicity (p=0.05). In groups of patients irradiated with biologically equivalent dose (assuming α/β=3Gy) of 47.3-63Gy and ≥70Gy, the risk of poor or moderate toxicity amounted to 16.7% (95% CI: 0-47%) and 71.4% (95% CI: 48-95%), respectively.
Conclusion: Brachytherapy revealed to be effective method of vaginal intraepithelial neoplasia treatment, but applying EQD2≥70Gy into vagina generates unacceptable toxicity.
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