title: Oncogenic PIK3CA mutation and dysregulation in human salivary duct carcinoma.
abstract: Salivary duct carcinoma (SDC) is an aggressive malignant tumor with a high mortality, which resembles high-grade breast ductal carcinoma in morphology. The parotid gland is the most common location. Its molecular genetic characteristics remain largely unknown. We have previously reported high incidence of PIK3CA somatic mutations in head and neck squamous cell carcinoma, particularly in pharyngeal cancers. Here we examined the PIK3CA gene expression status and hotspot mutations in six cases of SDC by immunohistochemistry and genomic DNA sequencing. Immunohistochemistry showed that PIK3CA expression was elevated in all six patients with SDC. By DNA sequencing, two hotspot mutations of the PIK3CA gene, E545K (exon 9) and H1047R (exon 20), were identified in two of the six cases. Our results support that oncogenic PIK3CA is upregulated and frequently mutated in human SDC, adding evidence that PIK3CA oncogenic pathway is critical in the tumorigenesis of SDC, and may be a plausible drug target for this rare disease.
authors: The Department of Pathology, Columbia University Medical Center, 1130 Saint Nicholas Avenue, ICRC 10-04, New York, NY 10032, USA ; Herbert Irving Comprehensive Cancer Center, Columbia University Medical Center, 1130 Saint Nicholas Avenue, ICRC 10-04, New York, NY 10032, USA.
authors: Wanglong
authors: W
authors: Qiu
authors: The Department of Pathology, Columbia University Medical Center, 1130 Saint Nicholas Avenue, ICRC 10-04, New York, NY 10032, USA.
authors: Guo-Xia
authors: GX
authors: Tong
authors: The Department of Pathology, Columbia University Medical Center, 1130 Saint Nicholas Avenue, ICRC 10-04, New York, NY 10032, USA.
authors: Andrew T
authors: AT
authors: Turk
authors: The Department of Otolaryngology and Head and Neck Surgery, Columbia University Medical Center, 1130 Saint Nicholas Avenue, ICRC 10-04, New York, NY 10032, USA.
authors: Lanny G
authors: LG
authors: Close
authors: The Department of Otolaryngology and Head and Neck Surgery, Columbia University Medical Center, 1130 Saint Nicholas Avenue, ICRC 10-04, New York, NY 10032, USA.
authors: Salvatore M
authors: SM
authors: Caruana
authors: The Department of Pathology, Columbia University Medical Center, 1130 Saint Nicholas Avenue, ICRC 10-04, New York, NY 10032, USA ; Herbert Irving Comprehensive Cancer Center, Columbia University Medical Center, 1130 Saint Nicholas Avenue, ICRC 10-04, New York, NY 10032, USA ; The Department of Otolaryngology and Head and Neck Surgery, Columbia University Medical Center, 1130 Saint Nicholas Avenue, ICRC 10-04, New York, NY 10032, USA.
authors: Gloria H
authors: GH
authors: Su
mesh_terms: D000368:Aged; D002277:Carcinoma / Q000235:genetics*; D058534:Class I Phosphatidylinositol 3-Kinases; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009154:Mutation / Q000235:genetics*; D019869:Phosphatidylinositol 3-Kinases / Q000235:genetics*; D012468:Salivary Gland Neoplasms / Q000235:genetics*
chemical_list: D019869:Phosphatidylinositol 3-Kinases; D058534:Class I Phosphatidylinositol 3-Kinases; C484760:PIK3CA protein, human