Molecular testing is performed on your tumor tissue, blood and plasma with tests to discover what biomarkers they might contain and which of these biomarkers might determine how your cancer behaves or will behave. Biomarkers can be proteins, genes, or other biological substances. The results of these tests determine your distinct 'molecular fingerprint.' Just as no two fingerprints are alike, neither are molecular fingerprints. The information contained in your unique molecular fingerprint gives your oncologist or treating physician insights into how to personalize your Lung Cancer treatment. A biopsy must be performed to obtain an ideal amount of your tumor tissue for testing and may be done in any number of ways that will be recommended by your physician.