Study of FHIT and WWOX expression in mucoepidermoid carcinoma and adenoid cystic carcinoma of salivary gland.
Mucoepidermoid carcinoma (MEC) and adenoid cystic carcinoma (ACC) are salivary gland neoplasms with divergent morphological features and clinical behavior. ACC is a basaloid tumor whereas MEC is a glandular epithelial neoplasm. FHIT and WWOX are tumor suppressor genes that encompass the FRA3B and FRA16D fragile sites at chromosomes 3p14.2 and 16q23.3, respectively. In previous studies, we have shown concordant loss of Fhit and Wwox expression in breast cancer, with significantly more frequent loss in cancers of basal-like phenotype. To determine if there is a similar association in salivary gland neoplasms, we designed a study of MEC and ACC of salivary gland on tissue microarrays (TMA). TMAs were constructed from 25 MEC and 19 ACC of salivary gland. Fhit and Wwox protein expression was assessed by immunohistochemical staining of cores on TMAs. Correlations among immunohistochemical markers and histological type were determined by statistical analyses. Significantly reduced Fhit and Wwox expression was observed in ACC (p=0.002 and p<0.001, respectively). The results suggest that, as for breast cancer, loss of Fhit and Wwox expression might have a role in the pathogenesis of basaloid differentiation in salivary gland neoplasms; alternatively, differences in chromatin structure at chromosome fragile regions might make fragile genes more accessible to DNA damage and rearrangement early during preneoplastic stages of basaloid cancers. Studies of basaloid tumors of other organ systems may show similar results and these findings may have implications for treatment modalities designed for basal-like tumors.
Dincer
Nazmiye
N
Hacettepe University, Faculty of Medicine, Department of Pathology, Ankara, Turkey. nazmiye_karaman@yahoo.com
Tezel
Gaye Güler
GG
Sungur
Arzu
A
Himmetoglu
Cigdem
C
Huebner
Kay
K
Güler
Gülnur
G
D017766:Acid Anhydride Hydrolases / Q000235:genetics / Q000378:metabolism*; D000293:Adolescent; D000328:Adult; D000368:Aged; D003528:Carcinoma, Adenoid Cystic / Q000235:genetics / Q000378:metabolism*; D018277:Carcinoma, Mucoepidermoid / Q000235:genetics / Q000378:metabolism*; D045744:Cell Line, Tumor; D002471:Cell Transformation, Neoplastic; D002648:Child; D043283:Chromosome Fragile Sites; D002885:Chromosomes, Human, Pair 16; D002893:Chromosomes, Human, Pair 3; D005260:Female; D016147:Genes, Tumor Suppressor; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D009363:Neoplasm Proteins / Q000235:genetics / Q000378:metabolism*; D010088:Oxidoreductases / Q000235:genetics / Q000378:metabolism*; D011379:Prognosis; D012468:Salivary Gland Neoplasms / Q000235:genetics / Q000378:metabolism*; D025521:Tumor Suppressor Proteins / Q000235:genetics / Q000378:metabolism*; D000074584:WW Domain-Containing Oxidoreductase; D055815:Young Adult; D000099170:Bis(5'-adenosyl)triphosphatase
D017766:Acid Anhydride Hydrolases; D009363:Neoplasm Proteins; D010088:Oxidoreductases; D025521:Tumor Suppressor Proteins; D000074584:WW Domain-Containing Oxidoreductase; D000099170:Bis(5'-adenosyl)triphosphatase; C486071:WWOX protein, human