|Reference : First insights into the molecular basis of pleomorphic adenomas of the salivary glands.|
|Scientific journals : Article|
|Life sciences : Genetics & genetic processes|
|First insights into the molecular basis of pleomorphic adenomas of the salivary glands.|
|Voz, Marianne [Université de Liège - ULg > Département des sciences de la vie > GIGA-R : Biologie et génétique moléculaire >]|
|Van de Ven, W. J. [> > > >]|
|Kas, K. [> > > >]|
|Advances in Dental Research|
|International & American Associations for Dental Research|
|[en] Adenoma, Pleomorphic/genetics/pathology ; Cell Transformation, Neoplastic/genetics ; Chromosome Aberrations ; Chromosomes, Human, Pair 12/genetics ; Chromosomes, Human, Pair 8/genetics ; DNA-Binding Proteins/genetics ; Diploidy ; Ectoderm/pathology ; Endoderm/pathology ; Gene Expression Regulation, Neoplastic/genetics ; Humans ; Karyotyping ; Salivary Gland Neoplasms/genetics/pathology ; Translocation, Genetic ; Zinc Fingers/genetics|
|[en] Pleomorphic adenoma, or mixed tumor of the salivary glands, is a benign tumor originating from the major and minor salivary glands. Eighty-five percent of these tumors are found in the parotid gland, 10% in the minor (sublingual) salivary glands, and 5% in the submandibular gland. It is the most common type of salivary gland tumor, accounting for almost 50% of all neoplasms in these organs. In fact, after the first observation of recurrent loss of chromosome 22 in meningioma, this was the second type of benign tumor for which non-random chromosomal changes were reported. The rate of malignant change with the potential to metastasize has been reported to be only 2 to 3%, and only a few cases of metastasizing pleomorphic salivary gland adenomas have been described to date. The fact that these tumors arise in organs located in an ontogenetic transitional zone, a region where endoderm and ectoderm meet, might be one of the reasons for the often-problematic histopathological classification. This type of benign tumor has been cytogenetically very well-characterized, with several hundreds of tumors karyotyped. In addition to the cytogenetic subgroup with an apparently normal diploid stemline (making up approximately 30% of the cases), three major cytogenetic subgroups can be distinguished. In addition to a subgroup showing non-recurrent clonal abnormalities, another subgroup is various translocations involving 12q15. By far the largest cytogenetic subgroup, however, consists of tumors with chromosome 8 abnormalities, mainly showing translocations involving region 8q12. The most frequently encountered aberration in this group is a t(3;8)(p21;q12).|
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