Limited clinical relevance of mitochondrial DNA mutation and gene expression analyses in ovarian cancer
In recent years, numerous studies have investigated somatic mutations in mitochondrial DNA in various tumours. The observed high mutation rates might reflect mitochondrial deregulation; consequently, mutation analyses could be clinically relevant.
The purpose of this study was to determine if mutations in the mitochondrial D-loop region and/or the level of mitochondrial gene expression could influence the clinical course of human ovarian carcinomas.
Methods: We sequenced a 1320-base-pair DNA fragment of the mitochondrial genome (position 16,000 750) in 54 cancer samples and in 44 corresponding germline control samples.
In addition, six transcripts (MT-ATP6, MT-CO1, MT-CYB, MT-ND1, MT-ND6, and MT-RNR1) were quantified in 62 cancer tissues by real-time RT-PCR.
Results: Somatic mutations in the D-loop sequence were found in 57% of ovarian cancers.
Univariate analysis showed no association between mitochondrial DNA mutation status or mitochondrial gene expression and any of the examined clinicopathologic parameters. A multivariate logistic regression model revealed that the expression of the mitochondrial gene RNR1 might be used as a predictor of tumour sensitivity to chemotherapy.
Conclusions: In contrast to many previously published papers, our study indicates rather limited clinical relevance of mitochondrial molecular analyses in ovarian carcinomas. These discrepancies in the clinical utility of mitochondrial molecular tests in ovarian cancer require additional large, well-designed validation studies.
Author: Piotr Bragoszewski, Jolanta Kupryjanczyk, Ewa Bartnik, Andrea Rachinger and Jerzy Ostrowski
Credits/Source: BMC Cancer 2008, 8:292
Published on: 2008-10-08
Copyright by the authors listed above - made available via BioMedCentral (Open Access). Please
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