POU5F1 and carcinosarcoma: The highest upregulated serous-specific genes were XAGE2, CCDC155 and AIM2, and the most highly downregulated were PCP4, TBX1 and DLG2. There were 159 carcinosarcoma-specific DEGs identified, including the upregulated genes MYOG, DMRT2 and SLC7A10, and the downregulated genes WDR38, PHYHD1 and POU5F1.