Extramammary Paget disease ( EMPD ) is a rare intraepithelial adenocarcinoma affecting the genitals and axillary regions. As metastasis of these tumours is itself rare, solid disease management strategies have not been established. Serum carcinoembryonic antigen ( CEA ) and cytokeratin 19 fragment 21‐1 ( CYFRA 21‐1) levels have been identified as candidate biomarkers for tumour progression in EMPD .
To determine the accuracy of and the correlation between these markers in patients with EMPD .
Serum CEA and CYFRA 21‐1 levels were examined in 30 patients with EMPD treated at Keio University Hospital, and compared against clinical information. Both assays were performed at the time of diagnosis, during the postoperative observation period, and following systemic treatment in those with confirmed metastasis. Serum levels were then correlated with tumour progression status and treatment responses.
Normal levels for both assays were observed in all 11 patients with primary localized disease (100%). In patients with metastatic disease the CEA positivity rate was 79% (15 of 19 patients), with a rate of 63% (12 of 19 patients) for CYFRA 21‐1. Changes in CEA and CYFRA 21‐1 levels were statistically independent; however, using a combined view, elevated levels of either marker improved the positivity rate to 95% (18 of 19 patients). Use of both markers also correlated well with treatment responses.
The combination of CEA and CYFRA 21‐1 is useful for predicting metastasis and treatment response in patients with EMPD , especially in those who only have elevation of a single marker.
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