PAX8 and undifferentiated carcinoma: Finally, in addition to the morphological differences, this ALES did not express PAX-8, CD5, Ber-EP4 and loss of INI1 expression was not seen, further excluding the pancreas metastasis of intrathyroidal thyroid undifferentiated carcinoma [29], thymic carcinoma [30], skin basal cell carcinoma [31] and INI1-defient undifferentiated carcinoma [32].