Recent findings highlight SRY-box transcription factor 17 (SOX17) as a lineage marker frequently expressed in non-mucinous ovarian carcinomas [93–95], while trichorhinophalangeal syndrome type I (TRPS1)—initially identified as a breast cancer marker—has also been found to be commonly positive in OECs and endometrial carcinomas, necessitating cautious interpretation in differential diagnoses [96]. This evidence concerns the gene SOX17 and ovarian mucinous adenocarcinoma.