PMC6460677_01
a Hematoxylin and Eosin tumor stain. b Synaptophysin tumor stain. c TTF-1 tumor stain. d Cytokeratin 5/6 stain. e P63 tumor stain
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PMC6460677_01_41199_2017_22_Fig1_HTML.jpg
Fig1
The neoplastic cells were positive for cytokeratin AE1/AE3, synaptophysin, p16, and TTF-1 with a nuclear staining pattern; they were negative for cytokeratin 5/6, CAM 5.2, p63, chromogranin, CD56, and EBV (by in-situ hybridization) (Fig. 1). 
Left PET scan pre-treatment. Right PET scan post-treatment
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Fig2
Three months after completion of therapy, a PET/CT showed complete resolution of the tumor and metastatic lymph nodes along with and no evidence of distant metastasis (Fig. 2).