This is a single center, correlative study designed to assess metabolic features of melanoma tumors in patients. The study will involve the collection of melanoma tissue at the time of surgical biopsy or excision. All samples will be assessed by mass spectrometry for metabolomic analysis. A subset of patients will have received \[U-13C\]glucose infusions which will be utilized for isotope tracing metabolic analysis. Relevant clinical data (eg survival, metastasis) will be correlated with metabolic findings.
