Authored by: Andy Lin Art by: Caitlin Sweeney In the war on cancer, information is power. Survival chances skyrocket when malignancies are detected early and treated accordingly. But cancer is a moving target. Tumors develop resistance and spread to other parts of the body before symptoms appear. Although imaging and tissue biopsy help establish a diagnosis and guide treatment, they provide only limited information about a constantly changing disease. Tissue biopsy remains the gold standard...