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Having enough tissue available for biomarker (aka mutation, genetic, or molecular) testing can also be an important consideration. Before a biopsy is done, the patient should speak with his or her oncologist about having the tumor sample profiled. To find out if targeted cancer therapy makes sense for an individual with lung cancer, that person’s tumor tissue will be tested. The goal is to determine whether or not an appropriate target is present. The following video describes diagnostic testing for mutations in lung cancer.