First Insights into the Molecular Basis of Pleomorphic Adenomas of the Salivary Glands

2000 ◽  
Vol 14 (1) ◽  
pp. 81-83 ◽  
Author(s):  
M.L. Voz ◽  
W.J.M. Van de Ven ◽  
K. Kas
Keyword(s):  
Salivary Gland ◽  
Salivary Glands ◽  
Benign Tumor ◽  
Salivary Gland Tumor ◽  
Transitional Zone ◽  
Chromosome 8 ◽  
Gland Tumor ◽  
Histopathological Classification ◽  
Pleomorphic Adenomas ◽  
Chromosomal Changes

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 composed of tumors with various translocations involving 12ql5. By far the largest cytogenetic subgroup, however, consists of tumors with chromosome 8 abnormalities, mainly showing translocations involving region 8ql2. The most frequently encountered aberration in this group is a t(3;8)(p21;q12).

Intraductal Papillary Tumors of the Major Salivary Glands

2000 ◽  
Vol 124 (2) ◽  
pp. 291-295 ◽  
Author(s):  
Toshitaka Nagao ◽  
Isamu Sugano ◽  
Osamu Matsuzaki ◽  
Hitoshi Hara ◽  
Yoichiro Kondo ◽  
...  
Keyword(s):  
Salivary Gland ◽  
Salivary Glands ◽  
Salivary Gland Tumor ◽  
Papillary Adenocarcinoma ◽  
Intraductal Papilloma ◽  
Gland Tumor ◽  
Ki 67 ◽  
Parotid Gland Tumor ◽  
Invasive Component ◽  
Papillary Structure

Abstract Intraductal papilloma is an extremely rare benign salivary gland tumor that occurs most commonly in the minor salivary glands. To our knowledge, a malignant counterpart of intraductal papilloma has not been described previously. We report one case each of benign and malignant intraductal papillary tumors. The benign tumor occurred in the sublingual gland and was a typical example of intraductal papilloma, with the exception that we found no previously published reports of this type of tumor in this location. The other patient had a left parotid gland tumor that was architecturally similar to the intraductal papilloma, with the addition of cytologic atypia, intraductal extension, microinvasion, and lymph node metastases. This tumor was diagnosed as intraductal papillary adenocarcinoma with an invasive component. Both patients were alive and well without evidence of recurrence 2 years and 6 months (case 1) and 6 years (case 2) after surgery. Immunohistochemical examination revealed that the tumor cells resembled duct luminal cells in both cases. The 2 tumors had different immunoreactivities for carcinoembryonic antigen, p53, and Ki-67. The malignant counterpart of intraductal papilloma should be considered in the differential diagnosis of salivary gland tumors with a predominantly papillary structure, even though this tumor is extremely rare.

scholarly journals Etiology and familial inheritance of pleomorphic adenomas

2017 ◽  
Vol 5 (1) ◽  
Author(s):  
Krysten Clark
Keyword(s):  
Salivary Gland ◽  
Parotid Gland ◽  
Pleomorphic Adenoma ◽  
White Male ◽  
Salivary Gland Tumor ◽  
Major Salivary Gland ◽  
Gland Tumor ◽  
Superficial Lobe ◽  
Increased Risk ◽  
Pleomorphic Adenomas

Background: A pleomorphic adenoma is the most common salivary gland neoplasm in both children and adults. Pleomorphic adenomas are derived from ductal and myoepithelial cells and are most commonly found in the superficial lobe of the parotid gland. The purpose of this article is to discuss the genes involved in pleomorphic adenomas and the possible autosomal dominant mode of inheritance. Case Description: The first patient was a white male who was diagnosed with carcinoma ex pleomorphic adenoma, a highly aggressive tumor, at the age of 57. He had an undiagnosed pleomorphic adenoma for approximately 15 years prior. The tumor was excised and the patient underwent radiation in the location of his parotid gland for 4 years until he deceased. The second patient is a white female, his daughter, who was diagnosed with a benign pleomorphic adenoma at the age of 46. Her salivary gland tumor was excised and normal follow up appointments occurred. Practical Implications: Pleomorphic adenomas most commonly affect the parotid gland, the largest of the three major salivary gland tumors. Occurrence and excision of this salivary gland tumor will cause a decrease in the secretion of saliva, leading to a dry mouth and an increased risk of caries.

scholarly journals Pediatric Pleomorphic Adenoma of the Palate

2021 ◽  
Vol 2021 ◽  
pp. 1-5
Author(s):  
Jerome A. Lindeboom ◽  
Jean-Pierre T. F. Ho ◽  
Naomi Donner ◽  
Willem H. Schreuder
Keyword(s):  
Salivary Gland ◽  
Parotid Gland ◽  
Salivary Glands ◽  
Pleomorphic Adenoma ◽  
Pediatric Patients ◽  
Salivary Gland Tumor ◽  
Minor Salivary Glands ◽  
Gland Tumor

Pleomorphic adenoma is the most common salivary gland tumor but is extremely rare in pediatric patients. The parotid gland is the most affected salivary gland, and the minor salivary glands are rarely affected. Here, we report a case of a 12-year-old boy with a pleomorphic adenoma of the palate.

scholarly journals Unusual Salivary Gland Tumor of the Palate: Clinical, Histological and Immunohistochemical Features

Proceedings ◽  
2019 ◽  
Vol 35 (1) ◽  
pp. 7
Author(s):  
Petruzzi ◽  
Vella ◽  
Sportelli ◽  
Maiorano
Keyword(s):  
Salivary Gland ◽  
Salivary Glands ◽  
Who Classification ◽  
Salivary Gland Tumor ◽  
Gland Tumor

The latest WHO classification of salivary glands tumors includes more than 30 different benign and malignant histo-types [1]. [...]

scholarly journals Histopathological Pattern of Salivary Gland Tumors

2014 ◽  
Vol 4 (7) ◽  
pp. 520-524 ◽  
Author(s):  
S Shrestha ◽  
GK Pandey ◽  
CB Pun ◽  
R Bhatta ◽  
R Shahi
Keyword(s):  
Salivary Gland ◽  
Salivary Glands ◽  
Pleomorphic Adenoma ◽  
Malignant Tumor ◽  
Mucoepidermoid Carcinoma ◽  
Salivary Gland Tumor ◽  
Salivary Gland Tumors ◽  
Carcinoma Ex Pleomorphic Adenoma ◽  
Common Site ◽  
Gland Tumor

Background: The tumors of the salivary glands are uncommon head and neck neoplasms. The aim of this study was to evaluate the relative frequencies, types, site distribution and the histopathological features of salivary gland tumors. Materials and Methods: This was a retrospective study of 176 cases of salivary gland tumors collected from medical record section and department of pathology at B.P.Koirala Memorial Cancer Hospital from Jan. 2005 to Dec. 2010. Tumors were analyzed based on demographics, anatomic location and histopathological type. Results: Out of 176 cases, 66 (37.5 %) were benign and 110 (62.5 %) were malignant with M:F ratio of 1.7:1. The mean age observed was 44.76 years with age range of 12 to 75 years. Pleomorphic adenoma was found to be the commonest benign tumor (72.7 %), followed by Warthin tumor (15.1%), monomorphic adenoma (3.0 %) and basal cell adenoma (3.0 %). The mucoepidermoid carcinoma was the most common malignant tumor (38.1 %), followed by adenoid cystic carcinoma (25.4%), acinic cell carcinoma (10.9%), adenocarcinoma NOS (6.3%), carcinoma ex pleomorphic adenoma (5.4%) and unclassified malignant tumor (4.5 %). Parotid was the most common site for the location of tumors (70.4%) followed by submandibular (19.3%) and minor salivary glands (10.2 %). Conclusion: Pleomorphic adenoma was the commonest salivary gland tumor observed in both sexes. Mucoepidermoid carcinoma was the most common malignant salivary gland tumor. The parotid gland was the most common site of origin in both benign and malignant tumors. DOI: http://dx.doi.org/10.3126/jpn.v4i7.10291 Journal of Pathology of Nepal (2014) Vol. 4, 520-524

scholarly journals N-Terminal Truncated Myb with New Transcriptional Activity Produced Through Use of an Alternative MYB Promoter in Salivary Gland Adenoid Cystic Carcinoma

Cancers ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 45
Author(s):  
Candace A. Frerich ◽  
Hailey N. Sedam ◽  
Huining Kang ◽  
Yoshitsugu Mitani ◽  
Adel K. El-Naggar ◽  
...  
Keyword(s):  
Salivary Gland ◽  
Adenoid Cystic Carcinoma ◽  
Transcriptional Activity ◽  
Perineural Invasion ◽  
Salivary Gland Tumor ◽  
Rna Seq ◽  
Gland Tumor ◽  
Adenoid Cystic ◽  
Myb Proteins ◽  
Tumor Types

Adenoid cystic carcinoma (ACC) is an aggressive salivary gland tumor that frequently displays perineural invasion and is often associated with translocations or overexpression of the MYB oncogene. Detailed analyses of MYB transcripts from ACC patient samples revealed that ACC tumors utilize an alternative MYB promoter, which is rarely used in normal cells or other tumor types. The alternative promoter transcripts produce N-terminally truncated Myb proteins lacking a highly conserved and phosphorylated domain, which includes the pS11 epitope that is frequently used to detect Myb proteins. In RNA-seq assays, Myb isoforms lacking the N-terminal domain displayed unique transcriptional activities, regulating many genes differently than full-length Myb. Thus, a regulatory pathway unique to ACC activates the alternative MYB promoter, leading to the production of a truncated Myb protein with altered transcriptional activities. This could provide new therapeutic opportunities for ACC patients.

scholarly journals An Interesting Case of Hodgkin\'s Lymphoma Presenting as Salivary Gland Tumor

2021 ◽  
Vol 12 (2) ◽  
pp. 89-91
Author(s):  
Tharun Ganapathy Chitrambalam ◽  
Sidhu Sekhar ◽  
Preetham Anguraj ◽  
Koshy M Panicker
Keyword(s):  
Salivary Gland ◽  
Salivary Gland Tumor ◽  
Interesting Case ◽  
Gland Tumor
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