Overexpression of metadherin/MTDH is associated with an aggressive phenotype and a poor prognosis in invasive breast cancer

Eriko Tokunaga, Yuichiro Nakashima, Nami Yamashita, Yuichi Hisamatsu, Satoko Okada, Sayuri Akiyoshi, Shinichi Aishima, Hiroyuki Kitao, Masaru Morita, Yoshihiko Maehara

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Background: Metadherin (MTDH) plays functional roles in the tumorigenesis and tumor progression of various cancers. This study investigated the associations between MTDH and the clinicopathological features in primary breast carcinomas to clarify the role of MTDH in the phenotypes and prognosis of breast cancer. Methods: A total of 195 primary invasive breast cancer samples were evaluated. The MTDH DNA copy number and MTDH mRNA expression were analyzed by quantitative genomic polymerase chain reaction (PCR) and quantitative reverse transcriptase PCR. MTDH protein expression was analyzed by immunohistochemistry. Results: A positive correlation was found between the expression of MTDH protein and mRNA expression and the MTDH DNA copy number. MTDH overexpression was significantly associated with a high nuclear grade, negative estrogen receptor (ER) and progesterone receptor (PR) expression, high Ki67 index, poor disease-free survival (P = 0.0001), poor distant metastasis-free survival (P = 0.009), and poor overall survival (P = 0.0101). MTDH overexpression showed a particularly negative impact on the prognosis in node-negative patients. A multivariate analysis showed MTDH overexpression to be independently associated with a poor disease-free survival rate [HR 3.45, 95 % confidence interval (CI) 1.69-6.84, P = 0.0010] and a poor distant metastasis-free survival rate (HR 2.39, 95 % CI 1.08-5.01, P = 0.0319). Conclusion: MTDH overexpression contributes to an aggressive phenotype, thus leading to a poor prognosis for primary invasive breast cancer.

Original languageEnglish
Pages (from-to)341-349
Number of pages9
JournalBreast Cancer
Volume21
Issue number3
DOIs
Publication statusPublished - May 2014

All Science Journal Classification (ASJC) codes

  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Pharmacology (medical)

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