MUC1 and neoplasm: Immunohistochemically, the tumor cells were partially positive for cytokeratin (AE1/AE3), epithelial membrane antigen (EMA), cluster of differentiate 56 (CD56), synaptophysin, and CD10 and loss for SMARCA4 (Figure 2C), chromogranin A, and thyroid transcription factor-1 (TTF-1).