Assessment of methylation status of locoregional lymph nodes in lung cancer using EBUS-NA

Laura Millares, Mireia Serra, Felipe Andreo, Jose Sanz-Santos, Concepción Montón, Carles Grimau, Miguel Gallego, Laia Setó, Neus Combalia, Mariona Llatjos, Rosa Escoda, Eva Castellà, Eduard Monsó

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5 Citations (Scopus)

Abstract

© 2015, Springer Science+Business Media Dordrecht. Hypermethylation of the promoter region of tumor suppressor genes is associated with carcinogenesis in lung cancer (LC). Endobronchial ultrasound with needle aspiration (EBUS-NA) is a semi-invasive method for obtaining cell blocks from lymph nodes, which can be used for epigenetic analyses. To establish the relationship between methylation status of p16, DAPK, RASSF1a, APC and CDH13 genes in lymph nodes sampled by EBUS-NA, tumor staging and prognosis. Methylation status of DAPK, p16, RASSF1a, APC and CDH13 genes was assessed in EBUS-NA cell blocks from LC patients and related to stage and survival. Eighty-five consecutive patients [mean age 67 (SD 8)] were included. Methylation of ≥1 gene was found in 43 malignant nodes (67 %). A higher prevalence of RASSF1a methylation was observed in small cell lung cancer patients [9/10 (90 %) vs. 15/53 (28 %); p < 0.001 χ2 test]. Methylation of APC and/or p16 was related to advanced staging in non-small cell lung cancer (NSCLC) [15/29 (52 %) vs. 6/24 (25 %), p = 0.048, χ2 test]. Patients with NSCLC showing methylation of APC and/or p16 had also lower 6-month survival (p = 0.019, log rank test), which persisted after adjustment for age and subtyping (HR = 6, 95 % CI [1.8–19.5], p = 0.003, Cox regression). Epigenetic analyses are feasible in EBUS-NA cell blocks and may identify methylation patterns associated with worse prognosis. Methylation of p16 and APC genes in NSCLC patients was associated with advanced staging and lower 6-month survival.
Original languageEnglish
Pages (from-to)637-646
JournalClinical and Experimental Metastasis
Volume32
Issue number7
DOIs
Publication statusPublished - 26 Oct 2015

Keywords

  • EBUS-NA
  • Lung cancer
  • Lymph nodes
  • Methylation
  • NSCLC

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