Clear cell carcinoma, not otherwise specified/hyalinising clear cell carcinoma of the salivary gland: The current nomenclature, clinical/pathological characteristics and management
Introduction
Clear cell carcinoma, not otherwise specified (NOS), is a rare form of salivary gland tumour. One hundred and fifty cases have been reported in the English literature (Chaudhry et al., 1983, Lattanzi et al., 1985, Uri et al., 1986, Hayashi et al., 1988, Ogawa et al., 1991, Newman and Funkhouser, 1993, Milchgrub et al., 1994, Orden et al., 1994, Rajab et al., 1994, Simpson et al., 1990, Tang et al., 1995, Okon et al., 1996, Urban et al., 1996, Triantafillidou et al., 1997, Berho and Huvos, 1999, Rinaldo et al., 1999, Rezende et al., 1999, Ereño et al., 2000, Milchgrub et al., 2000, Boccato et al., 2000, Grenevicki et al., 2001, Nayak et al., 2001, Balakrishnan et al., 2002, Browne and Holland, 2002, Félix et al., 2002, Manoharan et al., 2002, Moh'd Hadi et al., 2002, Wang et al., 2002, Sahasrabudhe et al., 2003, Chao et al., 2004, Fujita et al., 2004, O'Regan et al., 2004, Sun et al., 2005, Sicurella et al., 2004, Suzuki et al., 2006, Angiero and Stefani, 2007, Ponniah et al., 2007, Suzuki et al., 2007, Uzochukwu et al., 2007, Lai et al., 2008, Pujary et al., 2008, Yang et al., 2008, Cheng et al., 2008, O'Sullivan-Mejia et al., 2009, Solar et al., 2009, Yamashita et al., 2009, Barber et al., 2010, Antonescu et al., 2011, Kauzman et al., 2011, López-Quiles et al., 2011, Masilamani et al., 2011, Baghirath et al., 2011, Cashman and Woo, 2012, Hijjawi et al., 2012, Jin et al., 2012, Roby et al., 2012, Saleh et al., 2012, Adil et al., 2013, Gon et al., 2013, Shah et al., 2013, Kim et al., 2013, Fulciniti et al., 2014, Su et al., 2015, Arpaci et al., 2014, Ceballos Sáenz et al., 2014). The disease first appeared in German literature in 1968 as part of a heterogeneous group of oral malignancies demonstrating clear cell populations (Kleinsasser et al., 1968). Donath et al. (1972) described the carcinoma as a form of epithelial-myoepithelial carcinoma, originating from the intercalated ducts. Then, the carcinoma was defined by Chaudhry et al. (1983) who recognised that a subset of ‘glycogen-rich’ tumours were myoepithelium deficient. In 1994, Milchgrub et al. (1994) first isolated and characterized this unique subset of tumours, designating them as ‘hyalinizing clear cell carcinomas’. This was based on the observation that the carcinoma has a prominent hyalinised stroma and a lack of myoepithelial differentiation. Also, Dardick and Leong (2009) proposed primary squamous differentiation of the tumour based on a review of morphological, immunohistochemical and ultrastructural features. In 2005, the World Health Organization (WHO) classified the tumour the as “clear cell carcinoma, not otherwise specified” (Ellis, 2005). The carcinoma is defined as a malignant epithelial neoplasm composed of monomorphous population of cells having clear cytoplasm.
In the recent decade, the identification of a specific translocation (EWSR1-ATF1 (Ewing sarcoma breakpoint region 1-activator transcription factor 1) fusion-t (12; 22) (q13; q12)) in clear cell carcinoma, NOS indicates that this group of tumours belong to a distinct entity. Thus, the term “NOS” as a “wastebasket” qualifier is not appropriate anymore. Many authors recommended again using the term “hyalinising clear cell carcinoma” for this reason. Also, using the term “hyalinising” labelled the carcinoma as a separate class of salivary gland tumour as different from other clear cell malignancies of other origins (Gupta et al., 2015, Brandwein-Gensler and Wei, 2014).
As clear cell carcinoma, NOS/hyalinising clear cell carcinoma of the salivary gland is very uncommon, the majority of cases were reported in scattered case reports. There is a lack of comprehensive understanding of the clinical characteristics of the disease and subsequent treatment regimens. In addition to this, the finding of the specific translocation in the tumour and the proposed change in terminology led us to review the current concepts of the disease entity. In the current review, we analysed the clinical and pathologic characteristics of all the reported cases of clear cell carcinoma, NOS/hyalinising clear cell carcinoma in a systemic manner, in order to identify risk factors for recurrent disease and subsequent treatment recommendations.
Section snippets
Method
The literature between 1981 and 2014 recorded in PubMed was searched for the key-words included “clear cell”; “carcinoma”; “tumour”; “tumor”; “hyalinizing” “hyalinising” and “salivary gland”. Only original publications in English were reviewed. One hundred and fifty cases of clear cell carcinoma; NOS/hyalinising clear cell carcinoma of salivary gland were identified in the literature (Chaudhry et al., 1983, Lattanzi et al., 1985, Uri et al., 1986, Hayashi et al., 1988, Ogawa et al., 1991,
Epidemiology and clinical features
The majority of reported cases of clear cell carcinoma, NOS/hyalinising clear cell carcinoma of salivary gland were from the United States of America (n = 101). Other cases were published in India (n = 8), Japan (n = 7), Italy (n = 5), China (n = 4), Scotland (n = 3), Portugal (n = 3), Malaysia (n = 3), Canada (n = 3), Australia (n = 2), Spain (n = 2), United Kingdom (n = 2), Taiwan (n = 2), Ireland (n = 1), Poland (n = 1), Hong Kong (n = 1), Greece (n = 1), South Korea (n = 1), Turkey (n = 1) and Mexico (n = 1).
Clear cell carcinoma,
Conclusion
Clear cell carcinoma, NOS/hyalinising clear cell carcinoma is a rare malignancy of the minor salivary gland. It often affects middle aged women. EWSR1-ATF1 fusion is specific for the carcinoma, being not found in other types of salivary gland tumours, and could be used to differentiate the tumour from other tumours with clear cell morphology. It also leads to the proposal of the using the term “hyalinising clear cell carcinoma” instead of “clear cell carcinoma, NOS” for this group of lesion.
Conflict of interest
None.
Source of funding
Not applicable.
Acknowledgement
The authors would like to thank staff in Pathology Queensland, Gold Coast University Hospital in preparing the histology sections
Alfred King-yin Lam The corresponding author is an internationally recognized authority in diagnostic and molecular pathology of endocrine and head/neck cancer with more than 25 years of activities this field. He has published more than 280 articles in peer reviewed journals with impact factor and has written book chapters in World Health Organization’s classification of endocrine as well as head/neck tumours. His publications have attracted high citations in the research field with the
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Alfred King-yin Lam The corresponding author is an internationally recognized authority in diagnostic and molecular pathology of endocrine and head/neck cancer with more than 25 years of activities this field. He has published more than 280 articles in peer reviewed journals with impact factor and has written book chapters in World Health Organization’s classification of endocrine as well as head/neck tumours. His publications have attracted high citations in the research field with the citation index (H-index) for his publications at 44 for 2016. He also serves on editorial boards for a few international peer reviewed journals.