CDX-2 expression in pseudomyxoma peritonei: a clinicopathological study of 42 cases
Article first published online: 15 SEP 2006
Volume 49, Issue 4, pages 381–387, October 2006
How to Cite
Nonaka, D., Kusamura, S., Baratti, D., Casali, P., Younan, R. and Deraco, M. (2006), CDX-2 expression in pseudomyxoma peritonei: a clinicopathological study of 42 cases. Histopathology, 49: 381–387. doi: 10.1111/j.1365-2559.2006.02512.x
- Issue published online: 15 SEP 2006
- Article first published online: 15 SEP 2006
- Date of submission 8 January 2006 Accepted for publication 4 March 2006
- appendix mucinous neoplasm;
- pseudomyxoma peritonei
Aims: CDX-2 is a highly sensitive and specific marker of intestinal epithelial cells and their neoplastic counterparts. CDX-2 status in pseudomyxoma peritonei (PMP) has been barely reported. The aim of this study was to investigate the clinicopathological features of 42 cases of PMP with a special emphasis on CDX-2.
Methods and results: All patients were treated by cytoreduction. Immunohistochemistry was performed for CDX-2, MUC-2, MUC-5AC, cytokeratin (CK) 7 and CK20. Statistical correlation was evaluated for age, sex, completeness of cytoreduction and histological subtype with overall and progression-free survival (OS and PFS). PMP consisted of 32 cases of disseminated peritoneal adenomucinosis and 10 cases of peritoneal mucinous carcinomatosis. The appendix evaluated in 25 cases showed two mucinous adenocarcinomas and 21 low-grade appendiceal mucinous neoplasms. CDX-2 was diffusely positive in 40 cases, with the remaining two cases being focally positive. All cases demonstrated diffuse reactions to CK20 and MUC-2, and variable reactions to MUC-5AC, while CK7 was variably positive in 38 cases. Five-year OS was 97%. Histological type was significantly correlated with PFS (P = 0.02).
Conclusions: CDX-2 is diffusely and strongly positive in PMP. This is a useful marker to confirm an appendiceal origin of PMP, particularly when used in conjunction with CK7, CK20, MUC-2 and MUC-5AC.