This research study is evaluating an immune modulatory agent as a possible treatment for patients with Recurrent Respiratory Papillomatosis (RRP) with significant disease involving the larynx, trachea, and/or lungs. The investigators will be using Pembrolizumab as the treating agent.
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Overall Response Rate Via Endoscopic Lesional Burden Score and/or RECIST
Timeframe: Up to 2 years
Number of Participants With Adverse Events Through CTCAE
Timeframe: Up to 3 years after enrollment of the last the patient