Molecular Diagnostics of Melanoma Fine-Needle Aspirates A Cytology-Histology Correlation Study

Dept of Pathology, University of Michigan Medical School, 2G332 UH, 1500 E. Medical Center Dr, Ann Arbor, MI 48109-5054
American Journal of Clinical Pathology (Impact Factor: 2.51). 11/2012; 138(5):670-7. DOI: 10.1309/AJCPEQJW3PLOOZTC
Source: PubMed


Patients with advanced-stage melanoma harboring a BRAF mutation are candidates for BRAF inhibition as a therapeutic strategy. The use of fine-needle aspiration (FNA) to diagnose metastatic melanoma is increasing. Studies examining the predictive value of BRAF mutation analysis on melanoma FNAs via correlation with follow-up excision findings are lacking. We examined 37 consecutive FNA cases of metastatic melanoma in which the aspirated lesion was subsequently excised. DNA was purified from Diff-Quik-stained FNA smears and tissue blocks from corresponding excisions in parallel. BRAF mutation status was successfully obtained from both specimen types in 34 (92%) of 37 cases. BRAF mutations were detected in 12 (35%) of 34 cases-11 V600E and 1 V600K. Results of BRAF mutational analysis were concordant in all 34 FNA smear/tissue excision pairs. Thus, melanoma FNA for molecular diagnostics represents a rapid, minimally invasive, and effective management strategy in this era of precision medicine.

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