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Common occurrence of PIK3CA and PTEN mutations but not LPA4 mutations in pediatric and adult differentiated thyroid cancer
International Conference on Hematology and Oncology
June 29-July 01, 2017 Bangkok, Thailand

Murugan Avaniyapuram Kannan, Qasem E, Al-Hindi H and Alzahrani A S

King Faisal Specialist Hospital and Research Center, KSA

Scientific Tracks Abstracts: J Blood Disord Transfus


Thyroid cancer is the most common endocrine malignancy. In the past 4 decades, the incidence of thyroid cancer is consistently increasing in all parts of the world. Recently, mutations in the genes of GPCR signaling pathway were reported in thyroid cancer patients of mixed ages. However, the prevalence of mutations of the GPCR signaling pathway genes its significance is completely unknown in pure pediatric and adult DTCs. In this study, we determine the prevalence of the GPCR pathway genes (LPAR4, PIK3CA and PTEN) mutation in pure pediatric and adult DTCs. A total of 310 samples consisting of 17 multi nodular goiters (MNG), 89 pediatric (age < 18 years) and 204 adult (age > 18 years) DTC samples were analyzed for mutations in genes LPAR4 (exon 1), PIK3CA (exons 9 and 20) and PTEN (exons 5, 6, 7 and 8) of the GPCR pathway by PCR amplification of tumor genomic DNAs and direct sequencing of amplicons using Sanger sequencing. Overall, we found 2.7% (2/72) of PIK3CA and 1.4% (1/72) of PTEN in pediatric CPTC (classical papillary thyroid cancer). We identified 3.6% (2/55) of PIK3CA in FV-PTC (Follicular Variant PTC), 3.5% (1/29) of PIK3CA in TPC (Tall-cell PTC), and 1% (1/114) in CPTC of adult thyroid cancer. We did not find any mutations in LPAR4 gene in both pediatric and adult thyroid cancer. We also found two novel mutations one in the PIK3CA gene (C984Y) of a pediatric CPTC and the other in the PTEN gene of an adult CPTC sample. Our study is the first to report GPCR pathway mutations in a pure and adult DTC samples. Our results show a common occurrence of PIK3CA and PTEN mutations but not the LPAR4 mutations in both pediatric and adult DTCs suggest PIK3CA and PTEN genes of the GPCR pathway play a significant role in thyroid carcinogenesis and pave attractive target for therapeutic prevention.

Biography :

Murugan Avaniyapuram Kannan completed his PhD from the Department of Molecular Oncology, Tokyo Medical and Dental University, Tokyo, Japan and Postdoctoral studies from Hoshi University, Tokyo, Japan and The Johns Hopkins University School of Medicine, Baltimore, USA. Currently, he is a Scientist in the Department of Molecular Oncology, King Faisal Specialist Hospital & Research Center, Riyadh, Saudi Arabia. He has published more than 35 papers in reputed journals and holds a patent for identification of novel ALK mutations in anaplastic thyroid cancer. His research focuses on molecular biology of head and neck squamous cell carcinoma and thyroid cancer identifying molecular therapeutic targets and biomarkers. He has been serving as Reviewer in Thyroid, PLOS One, Oncogene, Cancer Research, Tumor Biology, Endocrine Related Cancer, Oral Oncology, etc.