Abstract
Interstitial brachytherapy (IBT) has been shown to provide high tumor control rates in metastatic colorectal carcinoma. Our aim was to evaluate efficacy and safety of IBT in patients with metastatic anal squamous cell carcinoma (mASCC). Seven patients with a total of 38 unresectable ASCC metastases (28 liver, nine lung, one nodal metastases) were treated with computed tomographic or open magnetic resonance imaging-guided IBT using an iridium-192 source. Clinical and image-based follow-up were performed every 3 months after treatment. Local tumor control rate was 97.4% during a median follow-up of 15.2 months. Median progression-free survival was 3.3 months (range=2.5-32.6 months). Median overall survival after IBT was 25.2 months (range=6.5-51.0 months). No severe adverse events (grade 3 or more) were recorded. Image-guided IBT is a safe and particularly effective treatment in patients with mASCC and might provide a well-tolerated therapeutic option in a multidisciplinary setting.
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