Identification of inguinofemoral lymph node metastases by methylation markers in vulvar cancer.

Abstract:

OBJECTIVE:Lymph node status in early-stage vulvar cancer can be accurately assessed by the sentinel-node (SN) procedure. Molecular techniques, such as DNA-methylation assay, might improve SN assessment. In this study, we selected methylation markers for vulvar cancer and determined if these methylation markers were suitable for lymph node assessment. METHODS:We performed methylation specific PCR on DNA isolated from primary tumors, metastatic lymph nodes, and negative lymph nodes from twenty vulvar cancer patients using the following genes: P16INK4a, MGMT, TWIST1, CADM1, TERT, and TFPI2. For P16INK4a and MGMT immunohistochemistry was performed on primary tumors and metastatic lymph nodes in order to explore intratumor heterogeneity in gene expression patterns. RESULTS:TERT was methylated in all vulvar cancers, P16INK4a in 13/20, TFPI2 in 12/20, CADM1 in 11/20, MGMT in 9/20, and TWIST1 in 7/20. A panel of three methylation markers (P16INK4a, TERT and TFPI2) reached a sensitivity of 67% and specificity of 100% for detection of metastatic lymph nodes. Immunohistochemistry showed intratumor heterogeneity for expression of P16INK4a and MGMT in respectively 55% and 45% of primary tumors. CONCLUSIONS:Our study shows methylation for one or more methylation markers in all vulvar cancers. Despite a specificity of 100% our panel of three methylation markers had only moderate sensitivity for metastatic lymph node detection, thereby limiting its applicability for lymph node assessment. Intratumor heterogeneity for expression of P16INK4a and MGMT may reflect intratumor heterogeneity for methylation patterns and thereby in general explain the moderate sensitivity of our marker panel for detection of metastases.

journal_name

Gynecol Oncol

journal_title

Gynecologic oncology

authors

Oonk MH,Eijsink JJ,Volders HH,Hollema H,Wisman GB,Schuuring E,van der Zee AG

doi

10.1016/j.ygyno.2012.01.013

subject

Has Abstract

pub_date

2012-05-01 00:00:00

pages

352-7

issue

2

eissn

0090-8258

issn

1095-6859

pii

S0090-8258(12)00037-6

journal_volume

125

pub_type

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