Therefore, additional immunohistochemical staining was performed which showed positivity for cytokeratin 7, cytokeratin 20 and Caudal Type Homeobox 2 (CDX2) in both the current peritoneal metastasis as well as the previous teratomatous type II GCT metastasis (Fig. 2a and supplementary figure 1). This evidence concerns the gene CDX2 and granular cell tumor.