Abstract: A method of examining a possibility of a subject having pancreatic cancer, including measuring GPRC5C (G protein-coupled receptor family C group 5 member C) present in an exosome in a specimen collected from the subject.

Abstract: The present invention is to provide a method of exosome analysis that can analyze exosome in a sample in a simple manner. The method of exosome analysis of the present invention is a method of analyzing exosome in a sample, including: an addition step of adding a first antibody that specifically binds to a first antigen contained in the exosome and a second antibody that specifically binds to a second antigen contained in the exosome to the sample; a reaction step of causing the first antigen to be reacted with the first antibody and the second antigen to be reacted with the second antibody; and a detection step of detecting a reaction between the first antigen and the first antibody and a reaction between the second antigen and the second antibody.

Abstract: A method increases permeability of a blood-brain barrier in a subject. The method includes administering a small interfering ribonucleic acid (siRNA) against the 3-Phosphoinositide Dependent Protein Kinase 1 (PDPK1) gene or micro ribonucleic acid (miRNA) miR-181c as an active ingredient to the subject. The method can be applied for delivering a desired active agent to the subject.

Abstract: A method of examining a possibility of a subject having pancreatic cancer, including measuring GPRC5C (G protein-coupled receptor family C group 5 member C) present in an exosome in a specimen collected from the subject.

Abstract: An exosome secretion inhibitor containing a substance suppressing expression of NAPG, HINT3 or GXYLT1 gene, or a substance suppressing activity of NAPG, HINT3 or GXYLT1 protein. It is possible to suppress secretion of exosome, thereby making it possible to suppress proliferation or metastasis of cancer cells, so that the substance suppressing expression of the gene or activity of the protein can be used as an active ingredient of a pharmaceutical composition suitably used in treatment of cancer or suppression of cancer metastasis, and also the substance can provide a carcinostatic agent having a new action mechanism which specifically suppresses expression of the gene or activity of the protein.

Abstract: A method for detecting a colorectal cancer, including the steps of measuring an amount of exosomes expressing CD147 in a body fluid sample derived from a test individual with an anti-CD147 monoclonal antibody or a fragment thereof; and comparing a signal intensity of exosomes in the step with a signal intensity in a control individual, wherein a case where the signal intensity in the test individual is found to be stronger than the signal intensity in the control individual serves as an index of the presence of the colorectal cancer. According to the method of the present invention, whether or not a sample provider has a high possibility of developing a colorectal cancer can be judged. Therefore, the method is useful because the sample provider can take a means of inhibiting the progression of cancer.