Association of positive dual-modality positron emission tomography/computed tomography imaging of primary choroidal melanoma with chromosome 3 loss and tumor size.
OBJECTIVE
To evaluate the positive dual-modality positron emission tomography/computed tomography (PET/CT) of choroidal melanoma with chromosome 3 loss and tumor size.


METHODS
Thirty-seven consecutive patients with choroidal melanoma with known chromosome 3 status who underwent whole-body PET/CT imaging were retrospectively reviewed. Cytology and chromosome 3 loss were identified by fine-needle aspiration biopsy. Fluorescent in situ hybridization and whole genome microarray by single-nucleotide polymorphism were used to evaluate the chromosome 3 status. Metabolic activity of primary choroidal melanoma by PET/CT imaging was evaluated.


RESULTS
Thirteen of 37 (35%) primary choroidal melanomas had loss of chromosome 3; 7 of the 13 (54%) melanomas were positive for metabolic activity identified by PET/CT imaging. All 24 of 37 melanomas without chromosome 3 loss were inactive for metabolic activity. There was a statistically significant association between positive metabolic activity and chromosome 3 loss (P = 0.00017 Fisher exact test); positive PET/CT imaging was 54% sensitive and 100% specific for loss of chromosome 3. Seven of 37 (19%) choroidal melanomas with positive metabolic activity by PET/CT were statistically significantly larger in size than the 30 metabolically inactive melanomas (P < 0.001, Kruskal-Wallis test).


CONCLUSIONS
Positive metabolic activity of choroidal melanoma identified by PET/CT imaging was statistically significantly associated with chromosome 3 loss and larger tumor size.
McCannel
Tara A
TA
Department of Ophthalmology, University of California, Los Angeles, CA, USA.
Reddy
Shantan
S
Burgess
Barry L
BL
Auerbach
Martin
M
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001707:Biopsy, Needle; D002830:Choroid Neoplasms / Q000175:diagnosis* / Q000235:genetics*; D002872:Chromosome Deletion; D002893:Chromosomes, Human, Pair 3 / Q000235:genetics*; D005260:Female; D019788:Fluorodeoxyglucose F18; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D008297:Male; D008545:Melanoma / Q000175:diagnosis* / Q000235:genetics*; D008875:Middle Aged; D020411:Oligonucleotide Array Sequence Analysis; D020641:Polymorphism, Single Nucleotide; D049268:Positron-Emission Tomography; D019275:Radiopharmaceuticals; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed
D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18