Both tumors were negative for the epithelial marker p63 (marker for squamous cell carcinoma) and the neuroendocrine markers calcitonin gene related protein (CGRP) and Achaete-scute complex homolog-1 (MASH1/ASCL1), characteristic of neuroendocrine tumors (Figure 2). Here, ASCL1 is linked to squamous cell carcinoma.