...- Patients be >= 18 years old at the time of enrollment and must have a documented germline neurofibromatosis 1 (NF1) mutation in a Clinical Laboratory Improvement Act (CLIA) certified laboratory or a diagnosis of NF1 based on clinical National Institutes of Health (NIH) consensus criteria; in addition to substantial cutaneous neurofibroma burden, at least one of the criteria below have to be present...