There are anecdotal reports of dogs detecting melanoma and studies of canines being able to not only detect but also distinguish cancer from noncancer. Analysis of volatile compounds or metabolites from exhaled human breath and excreted urine also has been shown to differentiate between patients with certain cancers and healthy individuals. In addition, investigators have demonstrated that melanoma tissue has a volatile profile that is distinct from healthy nonneoplastic skin and nevi.
Abaffy et al (Metabolomics. 2013;9:998-1008) conducted a study that gives further support to the potential for analyzing volatile organic compounds as biomarkers of melanoma. They used the headspace solid phase microextraction method followed by gas chromatography and mass spectrometry to compare the volatile metabolic profiles of melanoma and nonneoplastic healthy-appearing adjacent skin from the same patient. They discovered increased levels of lauric acid (C12:0) and palmitic acid (C16:0) in melanoma and they postulated that the increased levels of these fatty acids were due to cancer-associated upregulation of de novo lipid synthesis.
What’s the issue?
In the 1980s, nail fold capillary microscopy using an ophthalmoscope was occasionally performed to evaluate for disease-associated vascular changes in patients who were being evaluated for connective tissue disorders. Within 2 decades, a dermoscope to assist in the evaluation of not only nail folds but also pigmented and other lesions replaced the ophthalmoscope. The US Food and Drug Administration recently approved a software-driven optical imaging and data analysis device that can be used to obtain additional information to assist the clinician in making a decision whether to biopsy a pigmented lesion.
As our ability to develop more sensitive and specific methods to diagnose melanoma and differentiate it from benign lesions advances, our approach to the evaluation of patients with pigmented lesions shall continue to be modified. Based on the detection of melanoma-associated volatile organic compounds coupled with their potential use as readily accessible tumor-related biomarkers, it is reasonable to speculate: (1) that a handheld office-based device, a dermatoscenter, that can identify melanoma-induced volatile tumor markers shall be developed to evaluate whether pigmented lesions are malignant or benign, and (2) that this device will eventually become an integral component of the dermatologist’s diagnostic armamentarium. Does your dermatology center need a dermatoscenter?
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