Patent ID: 8735177

Claim:
A diagnostic marker comprising particles having a diameter of from 1 nm to 100 μm, the particles possessing on their surfaces: a site comprising lectin having a high specific bonding ability to a specific antigen residing on the mucosa of digestive cancers, said lectin bonded on the surface of the particles by covalent bonding; and a site comprising at least one of a structure represented by formula (1) and a structure represented by formula (2) having a low bonding ability to the mucosa of digestive organs, wherein, R is hydrogen atom or a hydrocarbon group having from 1 to 4 carbon atoms; and n is any number of from 10 to 400, wherein, m is any number of from 10 to 400, and the particles incorporating an identification material for detecting the particle, said material being incorporated in the course of particle synthesis so as to be sandwiched between the molecules of the particle, or incorporated by absorption into the inside of the particles after the particles are synthesized.