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Deoxyribonucleic acid ploidy studies in choroidal melanomas
K Coleman1, J P Baak, A Dorman
1Research Foundation, Royal Victoria Eye and Ear Hospital, Dublin, Ireland.
American Journal of Ophthalmology
|March 15, 1993
Summary
DNA quantitation in choroidal melanomas revealed image analysis as a valuable tool for diagnosis and prognosis. This method accurately assessed cell DNA content (ploidy), aiding in understanding malignancy.
Area of Science:
- Ophthalmology
- Oncology
- Genetics
Background:
- Cellular DNA content, or ploidy, is linked to malignancy in various tumors.
- Choroidal melanomas are a type of eye cancer where ploidy assessment may be relevant.
Purpose of the Study:
- To compare DNA quantitation methods (flow cytometry and image analysis) in choroidal melanomas.
- To evaluate the utility of image analysis for diagnosing and predicting outcomes of choroidal melanomas.
Main Methods:
- DNA quantitation was performed on 21 choroidal melanomas.
- Flow cytometry and image analysis were compared in 11 cases.
- Image analysis techniques were modified to address challenges posed by pigment and control cells.
Main Results:
- Fifteen tumors were diploid, and two were tetraploid.
- Image analysis successfully processed two tumors that were unprocessable by flow cytometry, identifying them as diploid.
- Image analysis detected tetraploidy in two tumors that flow cytometry classified as diploid.
- Spindle A cells were consistently diploid, while epithelioid cells predominantly formed tetraploid peaks.
Conclusions:
- Image analysis is a valuable tool for DNA quantitation in choroidal melanomas, complementing flow cytometry.
- This method can aid in confirming diagnosis and providing prognosis for choroidal melanomas.
- Image analysis may also be useful for therapeutic monitoring, such as in radiation treatment.