• Title/Summary/Keyword: BRAF 돌연변이

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Mechanism of Resistance and Epithelial to Mesenchymal Transition of BRAF(V600E) Mutation Thyroid Anaplastic Cancer to BRAF(V600E) Inhibition Through Feedback Activation of EGFR (BRAF(V600E) 돌연변이 갑상선 역형성암에서 BRAF(V600E) 억제에 의한 EGFR 발현 증가가 표적치료에 대한 저항성발현과 상피-간질세포이행과정에 미치는 영향분석)

  • Byeon, Hyung Kwon;Na, Hwi Jung;Yang, Yeon Ju;Park, Jae Hong;Kwon, Hyeong Ju;Chang, Jae Won;Ban, Myung Jin;Kim, Won Shik;Shin, Dong Yeob;Lee, Eun Jig;Koh, Yoon Woo;Choi, Eun Chang
    • Korean Journal of Head & Neck Oncology
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    • v.30 no.2
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    • pp.53-61
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    • 2014
  • Background and Objectives : Anaplastic thyroid carcinoma(ATC) is a rare but highly aggressive thyroid malignancy that is associated with an extremely poor survival despite the best multidisciplinary care. BRAF(V600E) mutation is detected in about a quarter of ATC, but unlike its high treatment response to selective BRAF inhibitor (PLX4032) in metastatic melanoma, the treatment response of ATC is reported to be low. The purpose of this study is to investigate the innate resistance mechanism responsible for this low treatment response to BRAF inhibitor and its effect on epithelial-mesenchymal transition(EMT). Materials and Methods : Two ATP cell lines, 8505C and FRO were selected and treated with PLX4032 and its drug sensitivity and effects on cell migration and EMT were examined and compared. Further investigation on the changes in signals responsible for the different treatment response to PLX4032 was carried out and the same experiment was performed on both orthotopic and ectopic xenograft mouse models. Results : FRO cell line was more sensitive to PLX4032 treatment compared to 8505C cell line. The resistance to BRAF inhibition in 8505C was due to increased expression of EGFR. Effective inhibition of both EGFR and p-AKT was achieved after dual treatment with BRAF inhibitor(PLX4032) and EGFR inhibitor(Erlotinib). Similar results were confirmed on in vivo study. Conclusion : EGFR-mediated reactivation of the PI3K/AKT pathway and MAPK pathway contributes to the relative insensitivity of BRAF(V600E) mutant ATC cells to PLX4032. Dual inhibition of BRAF and EGFR leads to sustained treatment response including cell invasiveness.

A Case of Cardiofaciocutaneous Syndrome caused by BRAF gene mutation (BRAF 유전자의 돌연변이로 진단된 Cardiofaciocutaneous 증후군 1례)

  • Lee, Beom-Hee;Kim, Jae-Min;Lee, Jin-Joo;Kim, Gu-Hwan;Yoo, Han-Wook
    • Journal of Genetic Medicine
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    • v.6 no.1
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    • pp.87-90
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    • 2009
  • Cardiofaciocutaneous (CFC) syndrome is characterized by dysmorphic features, cardiac anomalies, and cutaneous abnormalities. CFC syndrome belongs to the class of Noonan-related diseases. CFC syndrome can be clinically differentiated from other Noonan-related diseases by the distinct craniofacial features of sparse hair, a hypoplastic supraorbital ridge, exophthalmos and nystagmus, and skin manifestations such as ichthyosis and hyperkeratosis. However, phenotypes can overlap among Noonan-related syndromes, including CFC syndrome. Recently, several genes in the RAS-MAPK pathway have been identified as disease-causing genes for Noonan-related diseases. Here, we report on a Korean girl diagnosed with CFC syndrome caused by a V-raf murine sarcoma viral oncogene homolog B1 (BRAF) gene mutation, and we discuss the phenotype-genotype heterogeneities in Noonan syndrome and Noonan-related diseases.

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Pathological Factors Affecting DNA Quality in BRAF, EGFR, and KRAS Gene Molecular Tests (BRAF, EGFR, KRAS 유전자 분자병리검사에서 DNA 품질에 영향을 미치는 병리학적인 인자에 관한 연구)

  • Yun, Hyon-Goo;Kim, Bo-Ra;Lee, Joo-Mi;Song, Eun-Ha;Kim, Dong-Hoon
    • Korean Journal of Clinical Laboratory Science
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    • v.52 no.4
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    • pp.381-388
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    • 2020
  • The quality control of pathological specimens is important for accurate molecular pathology testing. This study evaluated that specimen factors affecting the DNA quality during tissue processing and sample types for BRAF, EGFR, and KRAS mutations tests. One thousand seven hundred and seventy-two molecular pathology tests were investigated for the factors influencing the DNA quality, such as sample type, formalin fixation time, and reexamination status. Cytology samples stored in a saline solution had better DNA quality than commercial cytology preservation. Tissue samples fixed in formalin within 24 hours had better DNA quality than the samples fixed over 24 hours. Between the types of samples, fresh tissue samples and tissue samples with a high tumor cell density had relatively better DNA quality than the formalin-fixed paraffin-embedded (FFPE) tissues and cytology specimens. Of real-time PCR, the non-PNA Ct value increased proportionally with samples held for longer than 24 hours in formalin, and that the formalin-fixed time affects the sample DNA quality. In conclusion, the appropriate tumor cellularity and 10% neutral formalin fixation time are the most important factors for maintaining the DNA quality. These factors should be managed properly for an accurate pathological molecular test to ensure optimal DNA quality.