MUC16 and cancer: In addition, with each cancer and patient, there exist different biomarkers that give insight, including imaging (e.g. computed tomography, magnetic resonance imaging, or histopathology) and blood biomarkers [e.g. protein-based markers such as PSA, cancer antigen 125 (CA125), or cancer antigen 9 (CA9), and emerging liquid biopsy techniques, such as circulating tumor DNA (ctDNA) monitoring].