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Published on: September 7, 2013
Actionable Mutation Profile of Sun-Protected Melanomas in South America
Ricardo Hsieh1,2, Marcello M S Nico2,3, Cláudia M C Camillo4
1Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, Brazil.
Abstract:
Melanomas that arise in sun-protected sites, including acral and oral mucosal melanomas, are likely under the control of unique, specific mechanisms that lead to mutagenesis through various pathways. In this study, we examined somatic mutations in tumors by targeted sequencing using a custom Ion Ampliseq Panel, comprising hotspots of 14 genes that are frequently mutated in solid tumors. Tumor DNA was extracted from 9 formalin fixation, paraffin-embedded sun-protected melanomas (4 primary oral mucosal melanomas and 5 acral lentiginous melanomas), and we identified mutations in the NRAS , PIK3CA , EGFR , HRAS , ERBB2 , and ROS1 genes. This study reveals new actionable mutations that are potential targets in the treatment of photo-protected melanomas. Additional studies on more of these melanoma subtypes could confirm our findings and identify new mutations.
Insights
Researchers identified new actionable mutations in sun-protected melanomas, specifically oral mucosal and acral lentiginous types. These findings offer potential therapeutic targets for treating these rare melanoma subtypes.
Area of Science:
- Oncology
- Genetics
- Dermatology
Background:
- Melanomas in sun-protected areas like the mouth and extremities may have distinct genetic drivers.
- Understanding these unique mutations is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate somatic mutations in oral mucosal melanomas and acral lentiginous melanomas.
- To identify actionable genetic alterations for potential therapeutic intervention.
Main Methods:
- Targeted sequencing of 14 frequently mutated cancer genes using a custom Ion Ampliseq Panel.
- Analysis of tumor DNA from 9 formalin-fixed, paraffin-embedded melanomas (4 oral, 5 acral).
Main Results:
- Identified mutations in key genes including NRAS, PIK3CA, EGFR, HRAS, ERBB2, and ROS1.
- Discovered novel actionable mutations specific to sun-protected melanoma subtypes.
Conclusions:
- The study highlights specific genetic mutations in photo-protected melanomas.
- These identified mutations represent potential therapeutic targets for treating oral and acral melanomas.
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