The High Frequency of De novo Promoter Methylation in Synchronous Primary Endometrial and Ovarian Carcinomas
Purpose: The methylation status of hMLH1, CDKN2A , and MGMT was investigated in a panel of synchronous cancers of the ovary and endometrium, fulfilling the clinicopathologic criteria for independent primary tumors to define the possible role of epigenetic mechanisms in the development of these cance...
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Veröffentlicht in: | Clinical cancer research 2006-06, Vol.12 (11), p.3329-3336 |
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Zusammenfassung: | Purpose: The methylation status of hMLH1, CDKN2A , and MGMT was investigated in a panel of synchronous cancers of the ovary and endometrium, fulfilling the clinicopathologic criteria
for independent primary tumors to define the possible role of epigenetic mechanisms in the development of these cancers.
Experimental Design: Bisulfite-converted DNA from 31 tumors (13 endometrial and 18 ovarian carcinomas) and from matched normal tissue of 13 patients
was analyzed by a methylation-specific PCR assay at the CpG-rich 5′ regions of all three genes. In all tumors, we also investigated
the presence of microsatellite instability and hMLH1 immunohistochemical expression in relation to hMLH1 hypermethylation status.
Results: Methylation of hMLH1, CDKN2A , and MGMT was detected in 39%, 41%, and 48% of endometrial and ovarian tumors, respectively. hMLH1 hypermethylation was observed in all tumors of five patients, and it was invariably associated with loss of hMLH1 protein
and presence of microsatellite instability. CDKN2A and MGMT methylation was randomly detected among both endometrial (45% and 24% of cases, respectively) and ovarian carcinomas (39%
and 39% of cases, respectively). Concordant methylation at two or three genes was observed in 35% of cases.
Conclusions: Epigenetic inactivation of hMLH1, CDKN2A , and MGMT may be a common and early event in the development of synchronous primary endometrial and ovarian carcinomas and may qualify
as a marker of a field cancerization encompassing the ovary and endometrium. Detection of MGMT hypermethylation may be useful to define a set of gynecologic malignancies with a specific sensitivity to alkylating chemotherapy. |
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ISSN: | 1078-0432 1557-3265 |
DOI: | 10.1158/1078-0432.CCR-05-2679 |