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Classifying melanocytic tumors based on DNA copy number changes.
Boris C Bastian1, Adam B Olshen, Philip E LeBoit
1Departments of Pathology and Dermatology, Dermatopathology Section, University of California-San Francisco, San Francisco, CA 94143-0808, USA. bastian@cc.ucsf.edu
The American Journal of Pathology
|October 28, 2003
Summary
Genetic analysis of DNA copy number changes can help distinguish melanoma from benign nevi. Most melanomas show chromosomal aberrations, while benign nevi rarely do, offering a potential diagnostic tool for ambiguous skin lesions.
Area of Science:
- Dermatopathology
- Cancer Genetics
- Genomics
Background:
- Melanoma and benign melanocytic nevi present similar histopathological features, leading to frequent misdiagnoses.
- Accurate differentiation is crucial for appropriate patient management and treatment.
Purpose of the Study:
- To investigate DNA copy number changes in melanocytic tumors using comparative genomic hybridization (CGH).
- To determine if genetic criteria can aid in the differential diagnosis between melanoma and benign nevi.
- To explore genetic variations in melanomas based on anatomical site and sun exposure.
Main Methods:
- Comparative genomic hybridization (CGH) was performed on 186 melanocytic tumors (132 melanomas, 54 benign nevi).
- DNA copy number alterations were analyzed and compared between melanoma and nevus groups.
- Melanoma genetic profiles were further analyzed based on anatomical location, histogenetic type, and sun-exposure patterns.
Main Results:
- Significant differences in chromosomal aberrations were observed between melanomas and nevi.
- 96.2% of melanomas exhibited chromosomal aberrations, compared to only 13.0% of benign nevi.
- A specific aberration (gain of chromosome 11p) was found in Spitz nevi but not in melanomas.
- Acral melanomas showed more aberrations on chromosomes 5p, 11q, 12q, and 15.
- Lentigo maligna melanomas and those on sun-damaged skin had increased losses of chromosomes 17p and 13q.
Conclusions:
- Chromosomal aberration patterns in melanoma are distinct from those in benign nevi, suggesting CGH as a potential diagnostic aid for ambiguous lesions.
- Genetic profiles of melanomas vary significantly based on anatomical site and sun exposure, indicating potential differences in therapeutic targets.