Treatment of recurrent mucosal melanoma of the oral cavity with topical imiquimod and pembrolizumab achieves complete histopathologic remission

Tejus Satish,Shaheer Khan, Matt Levin,Richard Carvajal,Angela J Yoon

JOURNAL FOR IMMUNOTHERAPY OF CANCER(2021)

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摘要
Mucosal melanomas constitute a subtype of melanoma with less effective treatments than cutaneous melanomas. We present a case of oral mucosal melanoma that recurred despite multiple resections and adjuvant temozolomide. Treatment with topical imiquimod combined with pembrolizumab achieved remission. A 56-year-old woman presented with a pigmented mass on her left anterior hard palate. Biopsy revealed malignant melanoma. The patient had resection with neck dissection with 3 months of adjuvant temozolomide due to positive margins. Malignant melanoma involving the hard palate recurred 1 year later requiring additional resection. Two years later, two additional pigmented lesions were found; further resections were deferred due to expected morbidity. Following 6 weeks of topical imiquimod treatment, the lesions shrunk significantly. Adjuvant pembrolizumab was added and complete histopathologic remission was observed in 6 months. The patient remained in remission for 4 years before new melanoma in situ was diagnosed, requiring five additional months of imiquimod. As of April 2021, there is no clinical evidence of melanoma. There are limited reports of oral melanoma treated with topical imiquimod. Here, imiquimod administered in combination with pembrolizumab achieved complete pathologic response.
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关键词
melanoma, immunotherapy, immunomodulation, case reports
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