Pediatric epithelial salivary gland tumors: spectrum of histologies and cytogenetics at a children's hospital.
There are conflicting reports regarding the relative frequency of benign and malignant epithelial salivary gland tumors in children. There are only a few reports of the cytogenetic abnormalities in the pleomorphic adenomas (PA) that arise in children, and even less information regarding the pleomorphic adenoma gene 1 (PLAG1) and high motility group A2 (HMGA2 ) histochemical staining in PAs, or their correlation with histologic types (stromal vs epithelial predominance). A retrospective 14 year review of epithelial salivary gland tumors encountered at a children's hospital identified 13 tumors: 12 PAs and 1 acinic cell carcinoma (ACC). No mucoepidermoid carcinomas were identified. Tumors arose in the parotid (7) and other sites (2 submandibular, 4 minor). Ten PAs in our cohort had cytogenetic studies. Four were normal, 5 involved 8q12, and 1 involved 12q13. Immunohistochemistry identified an additional 2 PAs with PLAG1 staining, and 5 additional PAs with HMGA2 staining. One tumor with ins(18;8)(q21.1;q12q22.2) had no PLAG1 staining, but stained with HMGA2. This ins(18;8) may not have involved the PLAG1 gene. There was no demonstrable correlation of 8q12/PLAG1 staining or 12q13/HMGA2 staining with histologic type. Thus we found abnormalities in either 8q12/PLAG1 staining or 12q13/HMGA2 staining in all PAs. The HMGA2 staining in 50% of PAs suggests that it may be more frequently involved in PAs than previously thought based on cytogenetic studies, at least in children.
Craver
Randall D
RD
Department of Pathology, Louisiana State University Health Sciences Center, New Orleans, LA 70112, USA. rcrave@lsuhsc.edu
Fonseca
Paula
P
Carr
Ronald
R
D008949:Adenoma, Pleomorphic / Q000235:genetics* / Q000378:metabolism / Q000473:pathology*; D000293:Adolescent; D002648:Child; D002869:Chromosome Aberrations; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D005260:Female; D025743:HMGA2 Protein / Q000235:genetics / Q000378:metabolism; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D012468:Salivary Gland Neoplasms / Q000235:genetics* / Q000378:metabolism / Q000473:pathology*
D004268:DNA-Binding Proteins; D025743:HMGA2 Protein; C104382:PLAG1 protein, human