Looking at the results of immunohistochemical analysis, which determined CK7 positivity with focal CK20 and CDX2 positivity, correlating them with the clinical presentation and radiological findings both preoperatively and during follow-up, everything indicates that this is a primary, and not a secondary (metastatic) mucinous ovarian tumor. The gene discussed is CDX2; the disease is ovarian mucinous neoplasm.