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Disease Markers
Volume 2014, Article ID 798170, 6 pages
Research Article

Expression of the Microtubule-Associated Protein MAP9/ASAP and Its Partners AURKA and PLK1 in Colorectal and Breast Cancers

1Institute of Human Genetics, UPR 1142, CNRS, 141 rue de la Cardonille, 34396 Montpellier, France
2Cancer Research Center of Toulouse, U1037, ERL5294, INSERM, CNRS and University Paul Sabatier, University of Toulouse, 205, route de Narbonne, 31077 Toulouse Cedex, France

Received 17 September 2013; Revised 25 March 2014; Accepted 14 April 2014; Published 30 April 2014

Academic Editor: George Perry

Copyright © 2014 Sylvie Rouquier et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Background. Colorectal and breast cancers are among the most common cancers worldwide. They result from a conjugated deficiency of gene maintenance and cell cycle control. Objective. We investigate the expression of the microtubule-associated protein MAP9/ASAP and its two partners AURKA and PLK1 in colorectal tumors as well as in ductal breast cancers. Materials and Methods. 26 colorectal cancer samples and adjacent normal tissues and 77 ductal breast cancer samples from grade I to grade III were collected. Real-time quantitative PCR was used to analyse the expression of MAP9, AURKA, and PLK1. Results. Expression of MAP9 is downregulated in colorectal cancer compared to normal tissues ( ), whereas those of AURKA and PLK1 are upregulated ( ). In ductal breast cancer, we found a grade-dependent increase of AURKA expression ( ), while the variations of expression of MAP9 and PLK1 are not significant ( ). Conclusions. MAP9 downregulation is associated with colorectal malignancy and could be used as a disease marker and a new drug target, while AURKA and PLK1 are upregulated. In ductal breast cancer, AURKA overexpression is strongly associated with the tumor grade and is therefore of prognostic value for the progression of the disease.