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Miserocchi G, Bassi M, De Luca G, Calpona S, De Rosa F, Bongiovanni A, Parisi E, Di Menna G, De Vita A, Liverani C, Spadazzi C, Cocchi C, Vanni S, Capelli L, Magnani M, Meccariello G, Vicini C, Campobassi A, Mercatali L, Ibrahim T. High-grade transformation of a polymorphous adenocarcinoma of the salivary gland: a case report and review of the literature. Front Oncol 2023; 13:1245043. [PMID: 37795450 PMCID: PMC10545860 DOI: 10.3389/fonc.2023.1245043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Accepted: 08/23/2023] [Indexed: 10/06/2023] Open
Abstract
Background Polymorphous adenocarcinoma (PAC) represents the second most widespread neoplasm of the minor salivary glands. These tumors rarely develop a histological progression from low-grade to high-grade malignancy, named "high-grade transformation" (HGT). Only nine cases are described in literature. Case description Here, we describe the case of a 76-year-old male patient with a PAC recurrence of the oral floor displaying HGT, and we explore the tumor cytomorphological features, genomic profiling, and the patient's clinical management. The tumor mass was characterized by poorly atypical cellular elements with vesicular nuclei and comedonecrosis foci. The growth pattern was predominantly solid, tubular, and cribriform. The lesion did not show microsatellite instability or targeted molecular alterations. The case was successfully treated with radical surgery followed by radiotherapy. Conclusion We report for the first time the recurrence of a PAC with HGT arising in the oral floor after 20 years from the primary lesion. These preliminary data and the literature analysis enhance the knowledge of this extremely rare disease.
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Affiliation(s)
- Giacomo Miserocchi
- Preclinic and Osteoncology Unit, IRCCS Istituto Romagnolo per lo Studio dei Tumori (IRST) “Dino Amadori”, Meldola, Italy
| | - Massimo Bassi
- Maxillofacial Surgery Unit, “Bufalini Hospital”, Azienda Unità Sanitaria Locale (AUSL) Romagna, Cesena, Italy
| | - Giovanni De Luca
- Pathology Unit, “Bufalini” Hospital, Azienda Unità Sanitaria Locale (AUSL) Romagna, Cesena, Italy
| | - Sebastiano Calpona
- Preclinic and Osteoncology Unit, IRCCS Istituto Romagnolo per lo Studio dei Tumori (IRST) “Dino Amadori”, Meldola, Italy
| | - Francesco De Rosa
- Immunotherapy, Cell Therapy and Biobank, IRCCS Istituto Romagnolo per lo Studio dei Tumori (IRST) “Dino Amadori”, Meldola, Italy
| | - Alberto Bongiovanni
- Preclinic and Osteoncology Unit, IRCCS Istituto Romagnolo per lo Studio dei Tumori (IRST) “Dino Amadori”, Meldola, Italy
| | - Elisabetta Parisi
- Radiotherapy Department, Istituto Scientifico Romagnolo per lo Studio e la Cura dei Tumori (IRST), IRCCS, Meldola, Italy
| | - Giandomenico Di Menna
- Department of Medical Oncology, IRCCS Istituto Romagnolo per lo Studio dei Tumori (IRST) “Dino Amadori”, Meldola, Italy
| | - Alessandro De Vita
- Preclinic and Osteoncology Unit, IRCCS Istituto Romagnolo per lo Studio dei Tumori (IRST) “Dino Amadori”, Meldola, Italy
| | - Chiara Liverani
- Preclinic and Osteoncology Unit, IRCCS Istituto Romagnolo per lo Studio dei Tumori (IRST) “Dino Amadori”, Meldola, Italy
| | - Chiara Spadazzi
- Preclinic and Osteoncology Unit, IRCCS Istituto Romagnolo per lo Studio dei Tumori (IRST) “Dino Amadori”, Meldola, Italy
| | - Claudia Cocchi
- Preclinic and Osteoncology Unit, IRCCS Istituto Romagnolo per lo Studio dei Tumori (IRST) “Dino Amadori”, Meldola, Italy
| | - Silvia Vanni
- Preclinic and Osteoncology Unit, IRCCS Istituto Romagnolo per lo Studio dei Tumori (IRST) “Dino Amadori”, Meldola, Italy
| | - Laura Capelli
- Biosciences Laboratory, IRCCS Istituto Romagnolo per lo Studio dei Tumori (IRST) “Dino Amadori”, Meldola, Italy
| | - Massimo Magnani
- Department of Head-Neck Surgery Azienda Unità Sanitaria Locale (AUSL) Romagna, Ear Nose Throat (ENT) Unit, Bufalini Hospital, Cesena, Italy
| | - Giuseppe Meccariello
- Otolaryngology and Head-Neck Surgery Unit, Department of Head-Neck Surgeries, Morgagni Pierantoni Hospital, Azienda USL della Romagna, Forlì, Italy
| | - Claudio Vicini
- Otolaryngology and Head-Neck Surgery Unit, Department of Head-Neck Surgeries, Morgagni Pierantoni Hospital, Azienda USL della Romagna, Forlì, Italy
| | - Angelo Campobassi
- Maxillofacial Surgery Unit, “Bufalini Hospital”, Azienda Unità Sanitaria Locale (AUSL) Romagna, Cesena, Italy
| | - Laura Mercatali
- Preclinic and Osteoncology Unit, IRCCS Istituto Romagnolo per lo Studio dei Tumori (IRST) “Dino Amadori”, Meldola, Italy
| | - Toni Ibrahim
- Preclinic and Osteoncology Unit, IRCCS Istituto Romagnolo per lo Studio dei Tumori (IRST) “Dino Amadori”, Meldola, Italy
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Cilona M, Locatello LG, Novelli L, Gallo O. The Mismatch Repair System (MMR) in Head and Neck Carcinogenesis and Its Role in Modulating the Response to Immunotherapy: A Critical Review. Cancers (Basel) 2020; 12:cancers12103006. [PMID: 33081243 PMCID: PMC7602801 DOI: 10.3390/cancers12103006] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Revised: 10/05/2020] [Accepted: 10/12/2020] [Indexed: 12/11/2022] Open
Abstract
Simple Summary The dysfunction of the mismatch repair system, an important mechanism for the detection and correction of DNA replication mistakes, may often lead to instability in the length of specific genetic sequences, known as microsatellites, and to the accumulation of mutations. Microsatellite instability is a well-known risk factor for the development of colorectal cancers and other types of tumors but is also considered a positive predictor of the immunotherapy response. Malignancies harboring such a specific genomic instability are very immunogenic because of the great number of aberrant antigens they produce. Therapies based on the blockade of specific immune checkpoints have shown to induce an effective immune response against microsatellite-unstable cancer. Many studies proved that microsatellite instability has a decisive role in the carcinogenesis and the malignant progression of head and neck cancer and, in the near future, it may become a useful tool in tailoring immunotherapy also in this field of precision oncology. Abstract The mismatch repair (MMR) system has a major role in the detection and correction of DNA replication errors, resulting from DNA polymerase slippage or nucleotides misincorporation. Specific inherited/acquired alterations or epigenetic inactivation of MMR genes are associated with microsatellite instability (MSI): the loss of crucial function in repairing DNA alterations can promote carcinogenesis by favoring the accumulation of thousands of mutations in a broad spectrum of different anatomic sites such as colon, stomach, prostate, esophagus, endometrium, lung and head and neck. Recent extensive data suggest that tumor mutational burden strongly correlates with a clinical response to immunotherapy using checkpoint inhibitors and this response is influenced by MMR deficiency in a wide range of human solid cancers. In this context, few data about this crucial point are available for head and neck cancer (HNC). In this review, we discuss the role of MMR alterations and the resulting MSI in HNC pathogenesis. Furthermore, by summarizing the clinical available data on how they influence the progression of precancerous lesions and the risk of recurrence or second primary tumors, we want to define the current role of MSI in the management of HNC. Finally, we analyze the complex interaction between cancer cells and the immune system addressing the data now available about a potential correlation between microsatellite instability and immunotherapy response in HNC.
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Affiliation(s)
- Maria Cilona
- Department of Otorhinolaryngology, Careggi University Hospital, Largo Brambilla, 3-50134 Florence, Italy; (M.C.); (L.G.L.)
| | - Luca Giovanni Locatello
- Department of Otorhinolaryngology, Careggi University Hospital, Largo Brambilla, 3-50134 Florence, Italy; (M.C.); (L.G.L.)
| | - Luca Novelli
- Department of Pathology, Careggi University Hospital, Largo Brambilla, 3-50134 Florence, Italy;
| | - Oreste Gallo
- Department of Otorhinolaryngology, Careggi University Hospital, Largo Brambilla, 3-50134 Florence, Italy; (M.C.); (L.G.L.)
- Correspondence: ; Tel.: +39-0557947989
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Nakano T, Takizawa K, Uezato A, Taguchi K, Toh S, Masuda M. Prognostic value of programed death ligand-1 and ligand-2 co-expression in salivary gland carcinomas. Oral Oncol 2019; 90:30-37. [DOI: 10.1016/j.oraloncology.2019.01.015] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2018] [Accepted: 01/25/2019] [Indexed: 02/07/2023]
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Particular aspects in the cytogenetics and molecular biology of salivary gland tumours - current review of reports. Contemp Oncol (Pozn) 2016; 20:281-6. [PMID: 27688723 PMCID: PMC5032155 DOI: 10.5114/wo.2016.61847] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Accepted: 04/24/2015] [Indexed: 12/26/2022] Open
Abstract
Salivary gland tumours are a group of lesions whose heterogeneity of biological and pathological features is widely reflected in the molecular aspect. This is demonstrated by an increasing number of studies in the field of genetics of these tumours. The aim of this study was to collect the most significant scientific reports on the cytogenetic and molecular data concerning these tumours, which might facilitate the identification of potential biomarkers and therapeutic targets. The analysis covered 71 papers included in the PubMed database. We focused on the most common tumours, such as pleomorphic adenoma, Warthin tumour, mucoepidermoid carcinoma, and others. The aim of this study is to present current knowledge about widely explored genotypic alterations (such as PLAG1 gene in pleomorphic adenoma or MECT1 gene in mucoepidermoid carcinoma), and also about rare markers, like Mena or SOX10 protein, which might also be associated with tumourigenesis and carcinogenesis of these tumours.
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Amaral-Silva GKD, Martins MD, Pontes HAR, Fregnani ER, Lopes MA, Fonseca FP, Vargas PA. Mismatch repair system proteins in oral benign and malignant lesions. J Oral Pathol Med 2016; 46:241-245. [PMID: 27509575 DOI: 10.1111/jop.12484] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/20/2016] [Indexed: 12/15/2022]
Abstract
Different environmental agents may cause DNA mutations by disrupting its double-strand structure; however, even normal DNA polymerase function may synthesize mismatch nucleotide bases, occasionally demonstrating failure in its proofreading activity. To overcome this issue, mismatch repair (MMR) system, a group of proteins specialized in finding mispairing bases and small loops of insertion or deletion, works to avoid the occurrence of mutations that could ultimately lead to innumerous human diseases. In the last decades, the role of MMR proteins in oral carcinogenesis and in the development of other oral cavity neoplasms has grown, but their importance in the pathogenesis and their prognostic potential for patients affected by oral malignancies, especially oral squamous cell carcinoma (OSCC), remain unclear. Therefore, in this manuscript we aimed to review and critically discuss the currently available data on MMR proteins expression in oral potentially malignant lesions, in OSCC, and in other oral neoplasms to better understand their relevance in these lesions.
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Affiliation(s)
| | - Manoela Domingues Martins
- Department of Pathology, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Hélder Antônio Rebelo Pontes
- Service of Buccal Pathology, João de Barros Barreto University Hospital, Federal University of Pará, Belém, Brazil
| | | | - Márcio Ajudarte Lopes
- Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Felipe Paiva Fonseca
- Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Pablo Agustin Vargas
- Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
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Alaizari NA, Tarakji B, Al-Maweri SA, Al-Shamiri HM, Darwish S, Baba F. p53 expression in pleomorphic adenoma of salivary glands: A systematic review and meta-analysis. Arch Oral Biol 2015; 60:1437-41. [PMID: 26163983 DOI: 10.1016/j.archoralbio.2015.06.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Revised: 05/29/2015] [Accepted: 06/15/2015] [Indexed: 01/10/2023]
Abstract
OBJECTIVE There are conflicting data regarding immunohistochemical expression of p53 in pleomorphic adenoma. This systematic review and meta-analysis aimed to examine whether p53 expression has a role in the pathogenesis of pleomorphic adenoma. DESIGN A comprehensive literature search for relevant studies published from 2000 up to end of 2014 was performed using PubMed, EMBASE and the Cochrane Library Databases. Only articles in which p53 detected by immunohistochemical staining were included. The meta-analysis was done using Comprehensive Meta-Analysis software. RESULTS Eighteen eligible studies were included in this meta-analysis. Heterogeneity measures showed a statistically significant Cochrane Q value (P-value<0.001). The random effects model showed an effect size of 0.254 with a 95% CI (0.139-0.417). The overall p53 positivity is 25.4%. CONCLUSION Mutant p53 has to be detected by more precise techniques to emphasize on its role in development of pleomorphic adenoma of salivary gland.
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Affiliation(s)
- Nader Ahmed Alaizari
- Department of Oral Maxillofacial Sciences, Al-Farabi College of Dentistry and Nursing, Riyadh, Saudi Arabia; Department of Oral Medicine and Pathology, Faculty of Dentistry, Sana'a University, Yemen.
| | - Bassel Tarakji
- Department of Oral Maxillofacial Sciences, Al-Farabi College of Dentistry and Nursing, Riyadh, Saudi Arabia
| | - Sadeq Ali Al-Maweri
- Department of Oral Maxillofacial Sciences, Al-Farabi College of Dentistry and Nursing, Riyadh, Saudi Arabia; Department of Oral Medicine and Pathology, Faculty of Dentistry, Sana'a University, Yemen
| | - Hashem Motahir Al-Shamiri
- Department of Oral Maxillofacial Sciences, Al-Farabi College of Dentistry and Nursing, Riyadh, Saudi Arabia
| | - Shourouk Darwish
- Department of Oral Maxillofacial Sciences, Al-Farabi College of Dentistry and Nursing, Riyadh, Saudi Arabia
| | - Feras Baba
- Aleppo University, Faculty of Dentistry, Syria
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Nomura T, Shibahara T. Detection of field alterations using useful tools for oral squamous cell carcinoma. JAPANESE DENTAL SCIENCE REVIEW 2013. [DOI: 10.1016/j.jdsr.2013.04.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Image cytometric analysis of p53 and mdm-2 expression in primary and recurrent mucoepidermoid carcinoma of parotid gland: immunohistochemical study. Diagn Pathol 2010; 5:72. [PMID: 21092204 PMCID: PMC3000838 DOI: 10.1186/1746-1596-5-72] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2010] [Accepted: 11/22/2010] [Indexed: 11/21/2022] Open
Abstract
Aims and Objectives This study aims to analyze immunocytochemically p53 aberrant expression and mdm-2 expression in primary and recurrent mucoepidermoid carcinoma (MEC) of parotid gland and to ascertain if expression of these markers correlates with tumor behavior, clinical outcome, histological grade and local recurrence. Methods 20 cases histologically diagnosed as primary MEC with different grades were included in the study. Out of 20 cases, 7 were classified as grade I, 8 as grade II and 5 as grade III. Immunohistochemical staining of these 20 primary cases as well as 6 recurrent cases with anti-p53 and anti-mdm-2 antibodies was carried out. Area fraction of immunopositivity was estimated by image analysis software. Results 16/20 primary cases were p53 +ve (80%). The p53 positive cases included 3 cases classified as grade (I), 8 cases as grade (II) and 5 cases as grade (III). All 6 recurrent cases were p53 +ve. On the other hand, 14/20 primary and only 2/6 recurrent cases were mdm-2 +ve. The mdm-2 +ve primary cases included 2 classified as grade (I), 7 as grade (II) and 5 as grade (III). 12 primary MEC showed co-expression of both p53 and mdm-2 of which 2 cases showed local recurrence. Conclusions these data suggested that expression of p53 and mdm-2 in primary and recurrent MEC correlates with the high histological grade. P53 aberrant expression is not only considered as an early event in MEC carcinogenesis but also correlates to tumor behavior and local recurrence. Mdm-2 overexpression is correlated to pathogenesis of MEC. However, no strong evidence was found between mdm-2 expression and MEC local recurrence.
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AL-Rawi NH, Omer H, AL Kawas S. Immunohistochemical analysis of P53and bcl-2 in benign and malignant salivary glands tumors. J Oral Pathol Med 2010; 39:48-55. [DOI: 10.1111/j.1600-0714.2009.00816.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Pannellini T, Spadaro M, Di Carlo E, Ambrosino E, Iezzi M, Amici A, Lollini PL, Forni G, Cavallo F, Musiani P. Timely DNA vaccine combined with systemic IL-12 prevents parotid carcinomas before a dominant-negative p53 makes their growth independent of HER-2/neu expression. THE JOURNAL OF IMMUNOLOGY 2006; 176:7695-703. [PMID: 16751417 DOI: 10.4049/jimmunol.176.12.7695] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Double transgenic mice overexpressing the transforming rat HER-2/neu oncogene and the mutated p53, with both dominant-negative and a gain-of-function properties, display early aggressive and metastasizing parotid tumors. Multiple acinar and ductal hyperplasia foci overexpressing the HER-2/neu gene product are evident at wk 5 and progress to poorly differentiated carcinoma by wk 7. Mice die before wk 18 with invasive carcinomas and multiple metastases that no longer express HER-2/neu. A combination of repeated electroporations of plasmids coding for the extracellular and transmembrane domains of the rat HER-2/neu receptor with systemic IL-12 administrations started when the parotids that present diffuse hyperplasia protected all female and 50% of the male mice until the close of the experiment at wk 40. This combined treatment began when multifocal in situ carcinomas that were already present cured 33% of the females and 25% of the males. The most prominent immunologic features associated with the antitumor protection were the production of high titers of anti-HER-2/neu Abs and the nonappearance of cell-mediated cytotoxic reactivity. In conclusion, anti-HER-2/neu vaccination combined with systemic IL-12 control parotid carcinomas as far as p53 mutation makes their growth independent of HER-2/neu expression.
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Affiliation(s)
- Tania Pannellini
- Aging Research Center, CeSi, G. d'Annunzio University Foundation, Chieti, Italy
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Abstract
Odontogenic tumors are lesions derived from the elements of the tooth-forming apparatus and are found exclusively within the jawbones. This review represents a contemporary outline of our current understanding of the molecular and genetic alterations associated with the development and progression of odontogenic tumors, including oncogenes, tumor-suppressor genes, oncoviruses, growth factors, telomerase, cell cycle regulators, apoptosis-related factors, regulators of tooth development, hard tissue-related proteins, cell adhesion molecules, matrix-degrading proteinases, angiogenic factors, and osteolytic cytokines. It is hoped that better understanding of related molecular mechanisms will help to predict the course of odontogenic tumors and lead to the development of new therapeutic concepts for their management.
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Affiliation(s)
- H Kumamoto
- Division of Oral Pathology, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, Sendai, Japan
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Poetsch M, Zimmermann A, Wolf E, Kleist B. Loss of heterozygosity occurs predominantly, but not exclusively, in the epithelial compartment of pleomorphic adenoma. Neoplasia 2005; 7:688-95. [PMID: 16026648 PMCID: PMC1501429 DOI: 10.1593/neo.05163] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2005] [Revised: 03/22/2005] [Accepted: 03/22/2005] [Indexed: 11/18/2022] Open
Abstract
Pleomorphic adenoma (PA), being the most common benign tumor of the salivary glands, is composed of epithelial and mesenchymal compartments. In this study, we analyzed 19 microsatellite markers from chromosomal arms 6q, 8q, 9p, 12q, and 17p in 31 PAs and 3 carcinoma ex pleomorphic adenomas (CXPAs) as well as 11 other non-PA-related carcinomas of the salivary gland for comparison. In our analysis, we differentiated between epithelial and mesenchymal tissues. Loss of heterozygosity (LOH) in PAs was most often found in 8q (32%) and 12q (29%). Two of the three CXPAs displayed allelic loss at all chromosomal arms investigated, whereas the results of the non-PA-related carcinomas were rather heterogeneous. LOH could not only be detected in the epithelial, but also in the mesenchymal, compartments of a subset of PAs, especially at chromosomal arm 8q. Concerning the CXPAs, we were able to demonstrate allelic losses not only in the malignant epithelial compartment, but also in the residual adenoma parts. Our data give further evidence that alterations in 8q may be an early event in PA tumorigenesis, whereas LOH in 12q may characterize cells with the potential to transform in CXPAs.
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Affiliation(s)
- Micaela Poetsch
- Institute of Forensic Medicine, University of Greifswald, Greifswald, Germany.
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Rutherford S, Hampton GM, Frierson HF, Moskaluk CA. Mapping of candidate tumor suppressor genes on chromosome 12 in adenoid cystic carcinoma. J Transl Med 2005; 85:1076-85. [PMID: 16025147 DOI: 10.1038/labinvest.3700314] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Adenoid cystic carcinoma (ACC) is a common malignancy of salivary glands, for which the underlying genetic mechanisms of tumorigenesis are poorly understood. Prior studies in ACC have identified deletions in chromosome 12. To further characterize these changes, we performed an extensive LOH analysis in 58 ACC using a panel of 28 microsatellite markers. Results show 66% overall genetic loss. Three markers (D12S1713, D12S2196, D12S398) are contiguous and define a 6.84 Mb region of deletion at 12q13.11-q13.13. Two other markers (D12S2078, D12S1628) are also contiguous and define a 4.5 Mb region of deletion at 12q24.32-q24.33. The three remaining markers, D12S1056 at 12q14.1, D12S1051 at 12q23.1 and D12S1636 at 12q23.3 define smaller regions of deletion. An analysis of microarray gene expression profiling data available for ACC shows several genes with significant transcriptional downregulation that map to these areas of genetic deletion. This combined genetic and genomic analysis provides several candidate genes to test for functional tumor suppressor activity in ACC.
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Affiliation(s)
- Sue Rutherford
- Department of Pathology, University of Virginia Health System, Charlottesville, VA 22908-0708, USA
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Matizonkas-Antonio LF, de Mesquita RA, de Souza SCOM, Nunes FD. TP53 mutations in salivary gland neoplasms. Braz Dent J 2005; 16:162-6. [PMID: 16475613 DOI: 10.1590/s0103-64402005000200014] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Many studies have demonstrated that loss of TP53 gene function has an important role in the genesis of many neoplasms, including salivary gland neoplasms. The purpose of this study was to examine the mutation profile of the TP53 gene in salivary gland neoplasms. Genomic DNA was extracted from paraffin-embedded tissues of pleomorphic adenoma, carcinoma in pleomorphic adenoma, mucoepidermoid carcinoma, adenoid cystic carcinoma and polymorphous low grade adenocarcinoma. Exons 5 to 8 of the TP53 gene were amplified by polymerase chain reaction (PCR) to perform single-stranded conformational polymorphism (SSCP) analysis. Band shifting was observed in exons 5, 6 and 8 in 9 out of 18 neoplasms. The results of this study suggest that mutations in TP53 gene are related to salivary gland neoplasms pathogenesis and that exons 5 and 8 are most frequently involved.
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Yokoo K, Noma H, Inoue T, Hashimoto S, Shimono M. Cell proliferation and tumour suppressor gene expression in iodine unstained area surrounding oral squamous cell carcinoma. Int J Oral Maxillofac Surg 2004; 33:75-83. [PMID: 14690663 DOI: 10.1054/ijom.2002.0457] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The purpose of this study was to investigate the relationship between epithelial dysplasia unstained with iodine and the expression of proliferating cell nuclear antigen (PCNA) and/or tumour suppressor gene (p53) and the existence of glycogen. Thirty cases of squamous cell carcinomas arising from the buccal mucosa and floor of the mouth were examined. Iodine unstained areas were diagnosed histopathologically as mild, moderate or severe epithelial dysplasia. Normal oral mucosa stained with iodine was used as a control group. There was no histochemical difference in the distribution or ratio of PAS-positive cells between the control and the mild epithelial dysplasia groups, however PAS stained areas of the moderate and the severe dysplasia groups were significantly decreased. Ultrastructurally, glycogen granules were not recognized in the moderate or severe dysplastic epithelia. Immunoreactive ratios of PCNA and p53 in the moderate and severe dysplastic groups were significantly higher than those of the control and the mild dysplasia groups. The positive ratio of PCNA was higher than that of p53, although the immunostaining patterns of PCNA- and p53-positive cells were quite similar. These results suggest that mild dysplastic epithelia that are stained with iodine may be in the category of normal epithelia, whereas both moderate and severe dysplasia that are un-stained with iodine may be suspected of malignant lesions.
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Affiliation(s)
- K Yokoo
- The 1st Department of Oral and Maxillofacial Surgery, Tokyo Dental College, Chiba, Japan
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