<prompt> What laboratory test is most appropriate for this patient?Alpha-fetoproteinBeta2-microglobulinCalcitoninInsulin-like growth factor-1  <response>: Answer C. CalcitoninThis patient had multiple flesh-colored papules on the eyelids, lips, and tongue. This phenotype is suggestive of multiple endocrine neoplasia MEN type 2B MEN-2B, an autosomal dominant condition characterized by medullary thyroid cancer among other features. Serum calcitonin can be used to screen for medullary thyroid cancer. 