GIP and cancer: Exosomes can be detected diagnostic cancer biomarkers in body fluids, such as prostate specific nucleic acid expression (PNA), gastrointestinal specific protein expression (GIP), and respiratory specific nucleic acid expression (RNA) (137, 138), which can identify cancer cells faster and more accurately, providing more detailed and reliable molecular information of cancer cells, so as to better predict the trend of cancer cell metastases and provide more accurate treatment guidance.