SNPMiner Trials by Shray Alag


SNPMiner SNPMiner Trials (Home Page)


Report for Clinical Trial NCT01543113

Developed by Shray Alag, 2020.
SNP Clinical Trial Gene

cKIT, BRAF/NRAS Mutations in Advanced Melanoma : Clinical Outcome in Response to Tyrosine-kinase Inhibitors - KitMel Project

Background: Metastatic melanoma has a devastating prognosis and is one of the top causes of cancer death in young patients. Until now, available therapies were few and unreliable, but recent understanding of melanomas' molecular pathways has improve their classification and new clinical strategies have been proposed. Initial studies showed that B-Raf/N-Ras mutations (respectively V600E and Q61) are the most frequent alteration being present in 70 to 80% of melanomas, characterizing non Chronic Sun-induced Damage skins (CSD). These include Superficial Spreading Melanomas (SSM) and Nodular Melanomas (NM). Other studies showed that c-Kit mutations are presently the predominant activating mutation (20 - 40 %) in Acro-Lentiginous Melanomas (ALM), Mucous Melanomas (MM) and in melanomas arising on CSD skin. c-Kit mutation pattern is more complex with four exons being affected leading to different mutations, which incidence and biological impact are less documented. BRAF/NRAS genetics alterations drive constantly cell growth, being thus attractive targets. Spectacular results have indeed been obtained with the BRAF inhibitor that targets the V600E BRAF-mutated form. Data from GIST disease revealed that the different c-Kit mutations modulate differently c-Kit function and the response to targeted therapies. Because c-Kit targeted therapy is a critical clinical issue, the investigators aimed to identify the most frequent mutations present in our population to propose appropriate screening test and adapt the therapy. Methods: 250 melanoma samples corresponding to an homogeneous white-Caucasian population (Brittany, France) will be screened. c-Kit exons 11, 13, 17 and 18 will be sequenced (direct sequencing and pyrosequencing when possible). c-Kit copy number will be quantified by q-PCR and level of c-Kit determined by immunohistochemistry (IHC, CD117). Samples will also be analyzed for B-Raf mutations in codon 464, 466, 469 and 600, and for N-Ras mutations in codon 12, 13 and 61 (Pyrosequencing). Expected Results: Taken together, the investigators anticipate that the present genetic analysis of the tumours from patients with advanced melanoma will first document the type and frequency of cKit mutations, will confirm or not that BRAF, NRAS and cKit mutations are mutually exclusive and document their repartition in the melanomas sub-types. Finally this study will clue researchers in to how well patients will respond to a therapy that targets the growth-promoting proteins BRAF/NRAS and cKIT.

NCT01543113 Melanoma
MeSH: Melanoma
HPO: Cutaneous melanoma Melanoma

1 Interventions

Name: sequencing

Description: sequencing

Type: Other

melanoma


Primary Outcomes

Description: c-Kit exons 11, 13, 17 and 18 will be sequenced (direct sequencing and pyrosequencing when possible)

Measure: c-Kit exons 11, 13, 17 and 18 will be sequenced (direct sequencing and pyrosequencing when possible)

Time: Day 1

Secondary Outcomes

Description: level of c-Kit determined by immunohistochemistry

Measure: level of c-Kit determined by immunohistochemistry

Time: Day 1

Description: Samples will also be analyzed for B-Raf mutations in codon 464, 466, 469 and 600, and for N-Ras mutations in codon 12, 13 and 61 (Pyrosequencing).

Measure: Samples will also be analyzed for B-Raf mutations in codon 464, 466, 469 and 600, and for N-Ras mutations in codon 12, 13 and 61 (Pyrosequencing).

Time: Day 1

Purpose: Diagnostic

Single Group Assignment


There is one SNP

SNPs


1 V600E

Initial studies showed that B-Raf/N-Ras mutations (respectively V600E and Q61) are the most frequent alteration being present in 70 to 80% of melanomas, characterizing non Chronic Sun-induced Damage skins (CSD). --- V600E ---

Spectacular results have indeed been obtained with the BRAF inhibitor that targets the V600E BRAF-mutated form. --- V600E ---



HPO Nodes


HPO:
Cutaneous melanoma
Genes 15
HRAS MITF CDKN2A BRAF NRAS NRAS WRN CDKN2A CXCR4 BAP1 POLH CDK4 ERCC3 XPC MC1R
Melanoma
Genes 98
MGMT NRAS POT1 NRAS XPA CTSC BRCA1 SDHC ERCC4 CXCR4 RAD51C CDKN2B ERCC3 XPC PALLD ERCC2 ERCC2 CHEK2 CDKN2A RAD51D GNAQ SDHD KRAS MBTPS2 BAP1 BAP1 CYSLTR2 RNF43 BAP1 CDKN2A PTPN11 CDK4 BRCA2 ERCC3 MITF TERF2IP ERCC4 CHEK2 BRCA1 TRPV3 POT1 OCA2 TERT CDKN2A AKT1 CDKN2A SF3B1 ERCC6 ERCC5 ERCC5 MDM2 BRCA2 BAP1 GNA11 ACD BRIP1 HRAS MRE11 BRAF TYR TP53 KLLN SEC23B PTEN PIK3CA XPA PERP MITF RAF1 BRAF POLH TP53 BARD1 NRAS SMAD4 RAD50 DDB2 ERCC2 NBN TERT MC1R SLC45A2 WRN PALB2 DDB2 PALB2 CDKN2A SDHB MC1R RAD51 TP53 XPC ERCC3 PTEN CDKN2A POLH CDK4 MC1R