B-RAF is a member of the RAF-family of kinases which plays an important role in the RAS-RAF-MEK-ERK mitotic signaling pathway. Mutations of B-RAF have been described in up to 100% of Hairy cell leukemia, 40-70% of Langerhans cell histiocytosis, approximately 50% of Erdheim-Chester disease, approximately 5% of diffuse large B cell lymphoma and plasma cell neoplasms and less than 5% of chronic lymphocytic leukemia. While some reports have found that 10-20% of cases of acute leukemias (ALL or AML) may have BRAF mutations, other reports have described no BRAF in those diseases or in myeloid diseases such as MDS or CML. The hotspot for mutations in BRAF is at codon Val600 and these are activating mutations. The most common activating mutation is p.Val600Glu(V600E). Various B-Raf inhibitors(Vemurafenib, Dabrafenib) have been FDA approved for therapy for some tumor types in certain clinical settings.

Eighty percent of all thyroid cancers are papillary thyroid carcinomas (PTCs). BRAF is part of the mitogen-activated protein kinase (MAPK) signaling pathway and V600E is an activating mutation of BRAF. The BRAF V600E mutation has been reported in 45% of patients with papillary thyroid carcinoma. The BRAF V600E-like PTC's (BVL) and the RAS-like PTC (RL-PTC) are fundamentally different in their genomic, epigenomic, and proteomic profiles. Presence of a BRAF p.Val600Glu (V600E) mutation is highly specific for papillary thyroid carcinoma and is only rarely associated with the follicular variant PTC , other well-differentiated thyroid neoplasms or nodular goiters. The possible prognostic impact of BRAF V600E mutations in papillary carcinoma of the thyroid continues to be studied. FDA approved dabrafenib and trametinib administered together for the treatment of BRAF V600E mutation-positive anaplastic thyroid cancer.

Presence of a BRAF c.1799T>A, p.Val600Glu (V600E) mutation in a microsatellite unstable colorectal carcinoma indicates that the tumor is probably sporadic and not associated with Lynch syndrome (HNPCC). However, if a BRAF mutation is not detected, the tumor may either be sporadic or Lynch syndrome associated. Detection of BRAF mutations may also be useful in determining patient eligibility for anti-EGFR treatment. Approximately 8--15% of colorectal cancer (CRC) tumors harbor BRAF mutations. The presence of BRAF mutation is significantly associated with right-sided colon cancers and is associated with decreased overall survival. Some studies have reported that patients with metastatic CRC (mCRC) that harbor BRAF mutations do not respond to anti-EGFR antibody agents cetuximab or panitumumab in the chemotherapy-refractory setting. BRAF V600-mutated CRCs may not be sensitive to V600E targeted TKIs. Drug: Vemurafenib + Panitumumab, Encorafenib + Binimetinib + Cetuximab, Radiation + Trametinib + Fluorouracil

B-RAF is a member of the RAF-family of kinases which plays an important role in the RAS-RAF-MEK-ERK mitotic signaling pathway. BRAF mutations are present in approximately 50% to 60% of cutaneous melanomas and are also present at lower frequencies in other melanoma subtypes. The hotspot for mutations in BRAF is at codon Val600 and the most common one is p.Val600Glu (V600E). Various B-Raf inhibitors(Vemurafenib, Dabrafenib) have been FDA approved for melanoma therapy in certain settings. Drug: Vemurafenib Dabrafenib Dabrafenib + Trametinib Vemurafenib + Cobimetinib Trametinib

Somatic mutations in BRAF have been found in 1-4% of all NSCLC most of which are adenocarcinomas and may be a potential therapeutic target in some settings. Drug: Vemurafenib, Dabrafenib, Dabrafenib + Trametinib

Somatic mutations in BRAF have been found in 1-4% of all NSCLC most of which are adenocarcinomas. The G469A mutation results in an amino acid substitution at position 469 in BRAF, occurs within the highly conserved motif of the kinase domain. Most mutant BRAF proteins, such as G469A, have increased kinase activity and are transforming in vitro. In preclinical studies, lung cancer cell lines harboring the BRAF G469A mutation were not sensitive to dasatinib

Somatic mutations in BRAF have been found in up to 10% of all NSCLC, more common in adenocarcinomas. The G464V mutation results in an amino acid substitution within the highly conserved motif of the kinase domain. This specific mutation is a low frequency cancer-associated variant classified as an intermediate activity mutant that moderately increases ERK activation and can transform cells. The predictive significance of this mutation needs further study. Clinical correlation is recommended.

Somatic mutations in BRAF have been found in 1-4% of all NSCLC most of which are adenocarcinomas. The K601E mutation results in an amino acid substitution at position 601 in BRAF, occurs within the highly conserved motif of the kinase domain. Most mutant BRAF proteins, such as K601E, have increased kinase activity and are transforming in vitro. Preclinical studies suggest that downstream signaling induced by the K601E mutant may be blocked by the BRAF inhibitor, vemurafenib.

The D594E mutation in BRAF is believed to result in inactivation of BRAF and, therefore, BRAF inhibitors are not likely to be effective.

BRAF alterations have been described in a wide spectrum of brain tumors, including in gliomas and glioneuronal tumors. BRAFV600E mutations have been found in approximately 10--15% of pilocytic astrocytoma and in approximately 5--10% of pediatric diffusely infiltrating gliomas, including diffuse astrocytomas (WHO grade II), anaplastic astrocytomas (WHO grade III) and glioblastomas (WHO grade IV), but in less than 2% of comparable adult gliomas. This mutation is potentially targetable.

BRAF mutants, with a 3bp insertion between codons 599 and 600, display increased in vitro kinase activity activation potential comparable to those of BRAF V600E mutants.

B-RAF is a member of the RAF-family of kinases which plays an important role in the RAS-RAF-MEK-ERK mitotic signaling pathway. Mutations of B-RAF have been described in up to 40-70% of Langerhans cell histiocytosis and approximately 50% of Erdheim-Chester disease. The hotspot for mutations in BRAF is at codon Val600 and these are activating mutations. The most common activating mutation is p.Val600Glu(V600E). Various B-Raf inhibitors(Vemurafenib, Dabrafenib) have been FDA approved for therapy for some tumor types in certain settings, and clinical trials for advanced BRAF V600 mutation-positive tumors using targeted therapy (often in combination with other therapy) may be available (clinical trials.gov).

This mutation, namely a 1795GTT insertion, results in BRAF V599Ins. Kinase assays on BRAF V599Ins and BRAF V600E show increased enzymatic activity, increased phosphorylation of MEK, MAPK and RSK and a high transformation rate in the cells compared to wild type BRAF. Thus, BRAF V599Ins, similar to BRAF V600E, is a 'gain of function' mutation, with constitutive activation, which accounts for its role in papillary cancer of the thyroid.

B-RAF is a member of the RAF-family of kinases which plays an important role in the RAS-RAF-MEK-ERK mitotic signaling pathway. Eighty percent of all thyroid cancers are papillary thyroid carcinomas (PTCs). Presence of a BRAF p.Val600Glu (V600E) mutation is highly specific for papillary thyroid carcinoma and is only rarely associated with the follicular variant PTC and other well-differentiated thyroid neoplasms or nodular goiters. The K601E mutation results in an amino acid substitution at position 601 in BRAF, occurring within the highly conserved motif of the kinase domain. This is the second most common BRAF mutation found in thyroid nodules after V600E. Unlike BRAF V600E, K601E is strongly associated with follicular-patterned cancer, particularly with the encapsulated follicular variant of PTC, and may also be found in follicular thyroid carcinomas. Overall, BRAF K601E mutant tumors may show better clinical outcomes than BRAF V600E positive tumors.

B-RAF is a member of the RAF-family of kinases which plays an important role in the RAS-RAF-MEK-ERK mitotic signaling pathway. BRAF mutations are common in a wide spectrum of brain tumors but they are not described in medulloblastomas to our knowledge. BRAF F595 mutations are pathogenic in some tumor types but their clinical significance in medulloblastomas remains to be studied. Various B-Raf inhibitors(Vemurafenib, Dabrafenib) have been FDA approved for therapy for some BRAF mutations in select tumor types in certain settings.

B-RAF is a member of the RAF-family of kinases which plays an important role in the RAS-RAF-MEK-ERK mitotic signaling pathway. BRAF mutations are present in approximately 50% to 60% of cutaneous melanomas and are also present at lower frequencies in other melanoma subtypes. A point mutation, L597R, is located in the kinase domain of BRAF. A case report has shown that a metastatic melanoma with this mutation is sensitive to BRAF inhibitors. In addition, it has been suggested that BRAF L597 mutations could potentially be responsive to MEK inhibitors. Drug: Trametinib BGB659

Somatic mutations in BRAF have been found in 1--4% of all NSCLC most of which are adenocarcinomas. The G466V mutation results in an amino acid substitution within the kinase domain of BRAF. Unlike other mutant BRAF proteins, G466V shows decreased kinase activity. In preclinical studies, lung cancer cell lines with G466V mutation were sensitive to TKI dasatinib, presumably by induction of tumor cell senescence. However, therapeutic implications of BRAF inhibitors in patients with this mutation need to be fully elucidated. Drug: Trametinib

BRAF is a member of the RAF-family of kinases which plays an important role in the RAS-RAF-MEK-ERK mitotic signaling pathway. Approximately 8-15% of colorectal cancer (CRC) harbors BRAF mutations. BRAF G469A mutation in exon 11 is infrequent in CRC and occurs within the kinase domain. The presence of BRAF mutation is significantly associated with right-sided colon cancers and is associated with decreased overall survival. BRAF mutation in a microsatellite unstable colorectal carcinoma indicates that the tumor is probably sporadic and not associated with Lynch syndrome (HNPCC). However, if a BRAF mutation is not detected, the tumor may either be sporadic or Lynch syndrome associated. Detection of BRAF mutations may also be useful in determining patient eligibility for anti-EGFR treatment. Some studies have reported that patients with metastatic CRC (mCRC) that harbor BRAF mutations do not respond to anti-EGFR antibody agents (cetuximab or panitumumab) in the chemotherapy-refractory setting. Results should be interpreted in conjunction with other laboratory and clinical findings.

B-RAF is a member of the RAF-family of kinases which plays an important role in the RAS-RAF-MEK-ERK mitotic signaling pathway. BRAF mutations are present in approximately 50% to 60% of cutaneous melanomas and are also present at lower frequencies in other melanoma subtypes. A point mutation, N581S, is located in the kinase domain of BRAF. It has been reported that N581S is associated with intermediate kinase activity. Correlation with other clinical and lab findings is necessary.

B-RAF is a member of the RAF-family of kinases which plays an important role in the RAS-RAF-MEK-ERK mitotic signaling pathway. BRAF mutations are present in approximately 50% to 60% of cutaneous melanomas and are also present at lower frequencies in other melanoma subtypes. A point mutation, D594G, is located in the kinase domain of BRAF. Mutations at residue D594 are believed to result in an impaired kinase activity. Correlation with other clinical and lab findings is necessary.

BRAF is a member of the RAF-family of kinases which plays an important role in the RAS-RAF-MEK-ERK mitotic signaling pathway. BRAF mutations are infrequent in small intestinal adenocarcinoma, ranging from 1% to13% of reported cases. BRAF N581S mutation is located in the kinase domain and has been associated with intermediate kinase activity. Mutations in the kinase region of BRAF have been associated with resistance to anti-EGFR therapy in colorectal cancers. The prognostic and predictive significance of this specific BRAF mutation in small intestinal adenocarcinoma needs further elucidation. Results should be interpreted in conjunction with other laboratory and clinical findings.

B-RAF is a member of the RAF-family of kinases which plays an important role in the RAS-RAF-MEK-ERK mitotic signaling pathway. BRAF mutations are present in approximately 50% to 60% of cutaneous melanomas and are also present at lower frequencies in other melanoma subtypes. Mutations at protein residue G464 are rare in melanoma and have not been reported in previous sequencing studies. The G464V mutation results in an amino acid substitution within the highly conserved motif of the kinase domain. This specific mutation is a low frequency cancer-associated variant classified as an intermediate activity mutant that moderately increases ERK activation and can transform cells. The predictive significance of this mutation needs further study. Clinical correlation is recommended.

Somatic mutations in BRAF have been found in up to 10% of all NSCLC, more common in adenocarcinomas. D594 is a highly conserved residue within the kinase domain of BRAF and mutation of this residue appears to result in kinase inactivation. In vitro study has shown that kinase-dead BRAF forms a constitutive complex with CRAF in the presence of activated RAS leading to MEK and ERK signaling. The predictive and prognostic significance of this mutation needs further study. Clinical correlation is recommended.

BRAF is a member of the RAF-family of kinases which plays an important role in the RAS-RAF-MEK-ERK mitotic signaling pathway. BRAF mutations are infrequent in small intestinal adenocarcinoma, ranging from 1% to 13% of reported cases. D594 is a highly conserved residue within the kinase domain of BRAF and mutation of this residue appears to result in kinase inactivation. In vitro study has shown that kinase-dead BRAF forms a constitutive complex with CRAF in the presence of activated RAS leading to MEK and ERK signaling. The predictive and prognostic significance of this specific BRAF mutation in small intestinal adenocarcinoma needs further study. Results should be interpreted in conjunction with other laboratory and clinical findings.

Mutations in beta catenin (CTNNB1) are seen in about 90% of adamantinomatous craniopharyngiomas and mutations in BRAF (V600E) in papillary craniopharyngiomas. Adamantinomatous and papillary craniopharyngiomas have been shown to carry clonal mutations that are typically mutually exclusive but may occasionally coexist. These findings indicate that the adamantinomatous and papillary subtypes have distinct molecular underpinnings, each principally driven by mutations in a single well-established oncogene - CTNNB1 in the adamantinomatous form and BRAF in the papillary form, independent of age. This may have implications for the diagnosis and treatment of these tumors. Treatment with the BRAF inhibitor vemurafenib has been reported to result in disease stabilization in a patient with a papillary craniopharyngioma with a BRAF V600E mutation.

This gene is a known cancer gene.

This gene is a known cancer gene.

BRAF is a member of the RAF-family of kinases which plays an important role in the RAS-RAF-MEK-ERK mitotic signaling pathway. BRAF V600E lies within the activation segment of the kinase domain of the BRAF protein and confers a gain of function. BRAF mutations are infrequent in urothelial carcinoma and are identified in 3-5% of cases. Various BRAF inhibitors (Vemurafenib, Dabrafenib) have been FDA approved for therapy for some tumor types in certain settings. The use of BRAF inhibitors in a number of other cancer types harboring BRAF V600E mutations are under investigation (clinicaltrials.gov). The clinicopathologic effects of BRAF in urothelial carcinoma remains to be fully elucidated.

BRAF is a member of the RAF-family of kinases which plays an important role in the RAS-RAF-MEK-ERK mitotic signaling pathway. BRAF mutations are present in approximately 50% to 60% of cutaneous melanomas and are also present at lower frequencies in other melanoma subtypes. The G469R variant accounts for less than 1% of mutations overall in melanoma; however, it has been shown to account for 13% of non-V600E BRAF mutations in a study of advanced melanoma cases. The G469R mutation results in an amino acid substitution at position 469 in BRAF and occurs within the highly conserved motif of the kinase domain. Amino acid substitutions at this positon have been shown to retain variable levels of kinase activity compared to the normal BRAF. The effect of this mutation (p.G469R) on the kinase activity of BRAF is unknown. Correlation with other clinical and lab findings is recommended.

BRAF is a member of the RAF-family of kinases which plays an important role in the RAS-RAF-MEK-ERK mitotic signaling pathway. Approximately 10% of cutaneous squamous cell carcinomas harbor somatic mutations in BRAF. The G469A mutation in exon 11 results in an amino acid substitution at position 469 in BRAF, which occurs in the highly conserved motif of the kinase domain. Most mutant BRAF proteins, such as G469A, have increased kinase activity and are transforming in vitro. Though BRAF mutations and targeted therapies have been have been studied in other solid tumors, the predicative and prognostic significant in cutaneous squamous cell carcinoma is unclear and needs to be further investigated.

BRAF is a member of the RAF-family of kinases which plays an important role in the RAS-RAF-MEK-ERK mitotic signaling pathway. The hotspot for mutations in BRAF is at codon Val600 and these are activating mutations. The most common activating mutation is p.Val600Glu(V600E). BRAF mutation frequencies are highly controversial in biliary tract cancers ranging from 0 to 33% for BRAF V600E. As most studies with high BRAF mutation rates were performed on European cohorts, this has raised the question of whether these discordant results represent a regional difference in the genetics of biliary tract cancer. In large cohort of biliary tract cancers including intrahepatic cholangiocarcinomas, extrahepatic cholangiocarcinomas, and adenocarcinomas of the gallbladder, BRAF V600E mutations were only rarely found in intrahepatic cholangiocarcinomas and were not identified in any cases of gallbladder adenocarcinoma. The clinicopathologic significance of BRAF V600E remains to be further elucidated in adenocarcinoma of the gallbladder. Various BRAF inhibitors (Vemurafenib, Dabrafenib) have been FDA approved for therapy for some tumor types in certain settings. These results should be interpreted in the clinical and radiographic context.

Drug: Trametinib BGB659

Drug: Trametinib

DRUG: Trametinib

Trametinib

Vemurafenib Dabrafenib Dabrafenib + Trametinib Vemurafenib + Cobimetinib

Vemurafenib Dabrafenib Dabrafenib + Trametinib

Vemurafenib

Drug Vemurafenib Dabrafenib Dabrafenib + Trametinib Vemurafenib + Cobimetinib

Vemurafenib

Vemurafenib Dabrafenib Dabrafenib + Trametinib

DRUG: Trametinib

RAS/RAF path mutation has been identified in 5-9 % of CLL patients. The K601E mutation results in an amino acid substitution at position 601 in BRAF, occurs within the highly conserved motif of the kinase domain. Most mutant BRAF proteins, such as K601E, have increased kinase activity and are transforming in vitro. Preclinical studies suggest that downstream signaling induced by the K601E mutant may be blocked by the BRAF inhibitor, vemurafenib.

Vemurafenib Dabrafenib Dabrafenib + Trametinib Vemurafenib + Cobimetinib Trametinib

Drug: Trametinib

Vemurafenib Dabrafenib Dabrafenib + Trametinib Vemurafenib + Cobimetinib Vemurafenib + Panitumumab Encorafenib + Binimetinib + Cetuximab Radiation + Trametinib + Fluorouracil

Trametinib

Somatic mutations in BRAF have been found in 1-4% of all NSCLC most of which are adenocarcinomas. The G466R mutation results in an amino acid substitution within the kinase domain of BRAF. Unlike other mutant BRAF proteins, G466R shows decreased kinase activity, however, it also causes paradoxically activation Erk signaling in cell culture Therapeutic implications of BRAF inhibitors in patients with this mutation need to be fully elucidated.

BRAF is a member of the RAF-family of kinases which plays an important role in the RAS-RAF-MEK-ERK mitotic signaling pathway. Approximately 8--15% of colorectal cancer (CRC) harbors BRAF mutations. BRAF G469V mutation in exon 11 is infrequent in CRC and occurs within the kinase domain. The presence of BRAF mutation is significantly associated with right-sided colon cancers and is associated with decreased overall survival. BRAF mutation in a microsatellite unstable colorectal carcinoma indicates that the tumor is probably sporadic and not associated with Lynch syndrome (HNPCC). However, if a BRAF mutation is not detected, the tumor may either be sporadic or Lynch syndrome associated. Detection of BRAF mutations may also be useful in determining patient eligibility for anti-EGFR treatment. Some studies have reported that patients with metastatic CRC (mCRC) that harbor BRAF mutations do not respond to anti-EGFR antibody agents (cetuximab or panitumumab) in the chemotherapy-refractory setting. Results should be interpreted in conjunction with other laboratory and clinical findings.

BRAF is part of the mitogen-activated protein kinase (MAPK) signaling pathway and is frequently mutated in papillary thyroid carcinoma (PTC). The BRAF V600E-like PTC's (BVL) and the RAS-like PTC (RL-PTC) are fundamentally different in their genomic, epigenomic, and proteomic profiles. The BRAF V600E mutation in Exon 15 is the most common BRAF mutation has been reported in 45% of patients with PTC. BRAF F468S is a rare somatic variant in Exon 11 and is located in the tyrosine kinase domain of the BRAF protein. The clinicopathologic effects of this variant as a somatic mutation in cancer has not been established in the literature. However, a mutation at the same location, F468C, has been shown to be a gain of function mutation. This variant has also been previously reported as a pathogenic germline variant in ClinVar associated with Cardio-facio-cutaneous syndrome. These results should be interpreted in the clinical context.

BRAF is part of the mitogen-activated protein kinase (MAPK) signaling pathway. BRAF G466V is a missense mutation which impairs BRAF kinase activity but paradoxically activates MEK and ERK through transactivation of c-RAF. This variant is associated with decreased cell proliferation and cell viability as compared to wild-type BRAF. This variant is a rare BRAF mutation and accounts for < 1% of BRAF mutations in colorectal adenocarcinoma. A single preclinical study of BRAF G466V in colon cancer demonstrated sensitivity to anti-EGFR tyrosine kinase therapy (cetuximab) and a MEK inhibitor (trametinib), however, there was no benefit seen with the RAF inhibitor vermurafinib. The clinicopathologic significance of BRAF G466V remains to be fully elucidated.

BRAF is a member of the RAF-family of kinases which plays an important role in the RAS-RAF-MEK-ERK mitotic signaling pathway. The K601E mutation results in an amino acid substitution at position 601 in BRAF, occurs within the highly conserved motif of the kinase domain. Most mutant BRAF proteins, such as K601E, have increased kinase activity and are transforming in vitro. BRAF mutations are infrequent in urothelial carcinoma and are identified in 3-5% of cases. Preclinical studies are investigating the use of MEK and RAS inhibitors in BRAF K601E mutant cell lines. The clinicopathologic effects of BRAF in this cancer type remain to be fully elucidated.

B-RAF is a member of the RAF-family of kinases which plays an important role in the RAS-RAF-MEK-ERK mitotic signaling pathway. Mutations of B-RAF have been described in up to 100% of Hairy cell leukemia, 40-70% of Langerhans cell histiocytosis, approximately 50% of Erdheim-Chester disease, approximately 5% of diffuse large B cell lymphoma and plasma cell neoplasms and less than 5% of chronic lymphocytic leukemia. Some types of Hairy Cell Leukemia (eg, Hairy Cell Leukemia-Variant, Hairy Cell Leukemia with IgHV4-34 rearrangement) are negative for BRAF V600E mutation and may have MAP2K1 mutations. While some reports have found that 10-20% of cases of acute leukemias (ALL or AML) may have BRAF mutations, other reports have described no BRAF in those diseases or in myeloid diseases such as MDS or CML. The hotspot for mutations in BRAF is at codon Val600 and these are activating mutations. The most common activating mutation is p.Val600Glu(V600E). B-Raf inhibitors(eg, Vemurafenib) have been FDA approved for therapy for various tumor types and have been used in Hairy Cell Leukemia in some clinical settings, including in combination with other therapy.

B-RAF is a member of the RAF-family of kinases which plays an important role in the RAS-RAF-MEK-ERK mitotic signaling pathway. The hotspot for mutations in BRAF is at codon Val600 and these are activating mutations. The most common activating mutation is p.Val600Glu(V600E). Various B-Raf inhibitors(Vemurafenib, Dabrafenib) have been FDA approved for therapy for some tumor types in certain settings, and clinical trials for advanced BRAF V600 mutation-positive tumors using targeted therapy (often in combination with other therapy) may be available (clinical trials.gov). It has been found that BRAF V600E has a mutation frequency of 2% in pancreatic cancer. A small study showed that no BRAF mutations were present in cases without KRAS mutations and in the few cases with BRAF mutations, a KRAS mutation was also present.

BRAF is a member of the RAF-family of kinases which plays an important role in the RAS-RAF-MEK-ERK mitotic signaling pathway. The hotspot for mutations in BRAF is at codon Val600 and these are activating mutations. The most common activating mutation is p.Val600Glu(V600E). Activating BRAF(V600E) (Val600Glu) mutations have been identified in approximately 1-2% of lung adenocarcinomas. Various BRAF inhibitors (Vemurafenib, Dabrafenib, and Trametinib) have been FDA approved for therapy for some tumor types in certain clinical settings. Of note, Dabrafenib and Trametinib are approved for metastatic non-small cell lung cancer (NSCLC) harboring BRAF V600E mutations.

BRAF is a serine/threonine kinase that plays a key role in the regulation of the mitogen-activated protein kinase (MAPK) cascade. Genetic alterations in BRAF are found in a large percentage of melanomas, thyroid cancers and histiocytic neoplasms as well as a small fraction of lung and colorectal cancers. Somatic mutations in BRAF have been found in up to 10% of all NSCLC, more common in adenocarcinomas. Genetic alterations of BRAF have been identified in 9% of lung adenocarcinomas. BRAF N581I lies within the protein kinase domain of the Braf protein (UniProt.org). N581I results in low Braf kinase activity and Ras-dependent activation of Erk signaling in cell culture but, induces similar cell proliferation and cell viability as wild-type Braf. The BRAF N581I mutation is known to be oncogenic.

BRAF is a serine/threonine kinase that plays a key role in the regulation of the mitogen-activated protein kinase (MAPK) cascade. Genetic alterations in BRAF are found in a large percentage of melanomas, thyroid cancers and histiocytic neoplasms as well as a small fraction of lung and colorectal cancers. Somatic mutations in BRAF have been found in up to 10% of all NSCLC, more common in adenocarcinomas. Genetic alterations of BRAF have been identified in 9% of lung adenocarcinomas. E586 is located within the kinase domain of BRAF and E586K mutation has been shown to result in increased kinase activity. The BRAF E586K mutation is likely oncogenic although the predictive and prognostic significance of this mutation needs further study. Correlation with other laboratory and clinical findings is recommended.

BRAF is part of the mitogen-activated protein kinase (MAPK) signaling pathway and V600E is an activating mutation of BRAF. The BRAF V600E mutation has been reported in 45% of patients with papillary thyroid carcinoma, which comprise 80 % of all thyroid cancers. Presence of a BRAF p.Val600Glu (V600E) mutation is highly specific for papillary thyroid carcinoma and is only rarely associated with the follicular variant PTC, other thyroid neoplasms, or nodular goiters. Anaplastic thyroid carcinomas are rare, highly aggressive, undifferentiated tumors that comprise 1% to 2% of all thyroid cancers in the United States. Well-differentiated papillary thyroid cancer, in which BRAF V600 mutations are an early and common driver mutation, precedes or coexists with approximately 50% of anaplastic thyroid carcinomas. Between 20% and 50% of anaplastic thyroid carcinomas harbor activating BRAF V600 mutations, with unknown prognostic significance. The possible prognostic impact of BRAF V600E mutations in carcinoma of the thyroid continues to be studied.

B-RAF is a member of the RAF-family of kinases which plays an important role in the RAS-RAF-MEK-ERK mitotic signaling pathway. Mutations of B-RAF have been described in <2% of head and neck squamous cell carcinomas. The hotspot for mutations in BRAF is at codon Val600 and the most common one is p.Val600Glu (V600E). Various B-RAF inhibitors have been FDA approved for cancer therapy in certain settings.

Somatic mutations in BRAF have been found in 1-4% of all NSCLC most of which are adenocarcinomas and may be a potential therapeutic target in some settings. The BRAF V590I variant lies within the protein kinase domain of the Braf protein, has not been biochemically characterized, but results in similar cell proliferation and viability levels to wild-type Braf in culture (PMID: 29533785), and therefore is predicted to have no effect on Braf protein function, but its oncogenic potential has not been characterized. Clinical correlation is recommended.

Somatic mutations in BRAF have been found in up to 10% of all NSCLC, more common in adenocarcinomas. D594 is a highly conserved residue within the kinase domain of BRAF and mutation of this residue appears to result in kinase inactivation. In vitro study has shown that kinase-dead BRAF forms a constitutive complex with CRAF in the presence of activated RAS leading to MEK and ERK signaling.While clinical trials targeting BRAF-mutant NSCLC have mostly focused on patients with V600E-mutant disease, in vitro studies suggests potential sensitivity to targeted agents in cell lines with inactivating BRAF non-V600 mutations. However, established clinical activity of targeted BRAF and MEK inhibition in patients with these mutations has yet to be fully elucidated and further study is warranted. Clinical correlation is recommended.