Current treatment approaches increasingly rely on cancer biomarkers to gain information about a patient's cancer to predict which treatment may work best for them, a practice known as precision medicine. At a fundamental level, precision medicine focuses on selecting the right treatment, for the right patient, at the right time to optimize health outcomes. Precision medicine looks at genetics, the environment, and lifestyle of a patient and accounts for specific information about the cancerous tumor to aide in diagnosis, estimate prognosis, select therapy, and monitor the efficacy of treatment.