CDX2 and ovarian mucinous adenocarcinoma: The presence of cytokeratin 7, 20, and CDX2 in the second biopsy of thecervical lymph node, markers used in occult primary malignancy search, suggestremaining tumor cells may have originated from a possible ovarian mucinous carcinoma(Table 1), with CA125 supporting this finding; however, serum CEA was negative.