Abstract: An antigen detection method detects an antigen having a specific sugar chain in a sample with a lectin that binds to plural kinds of sugar chains including the specific sugar chain. The detection method includes: a first step of bringing the lectin into contact with the sample; a second step of bringing a glycohydrolase capable of cleaving at least one kind of sugar chain to which the lectin can bind into contact with the sample, the at least one kind of sugar chain excluding the specific sugar chain among the plural kinds of sugar chains; and a step of detecting the antigen bound with the lectin after the first and second steps.

Abstract: A method of analyzing diagnostic information for estimating which of a benign prostate disease and prostate cancer is affecting a subject to be diagnosed combines two methods of analyzing diagnostic information. The first method includes measuring a concentration of a mucin-1 (Tn-MUC1), reactive with a lectin that recognizes and binds to an N-acetyl-D-galactosamine->serine(threonine) residue, in a subject blood sample, comparing the measured value with a threshold value, and estimating that a disease affecting the subject is benign prostate disease when the measured value is greater than the threshold value.

Abstract: A method of analyzing diagnostic information, the method including: measuring a concentration of a mucin-1 (Tn-MUC1), which is reactive with a lectin that recognizes and binds to an N-acetyl-D-galactosamine?serine (threonine) residue, in a blood sample originated from a subject to be diagnosed; comparing the measured value with a threshold value; and estimating that a disease affecting the subject to be diagnosed is not prostate cancer but a benign prostate disease when the measured value of the concentration of Tn-MUC1 is greater than the threshold value.

Abstract: A method of analyzing diagnostic information, the method including: measuring the concentration of all mucin-1s (total MUC1) in a blood sample originated from a subject to be diagnosed; comparing the measured value with a threshold value; and estimating that a disease affecting the subject to be diagnosed is not prostate cancer but a benign prostate disease when the measured value of the concentration of total MUC1 is greater than the threshold value.

Abstract: A method of analyzing diagnostic information, the method including: measuring a concentration of a mucin-1 (Tn-MUC1), which is reactive with a lectin that recognizes and binds to an N-acetyl-D-galactosamine?serine (threonine) residue, in a blood sample originated from a subject to be diagnosed; comparing the measured value with a threshold value; and estimating that a disease affecting the subject to be diagnosed is not prostate cancer but a benign prostate disease when the measured value of the concentration of Tn-MUC1 is greater than the threshold value.

Abstract: A method of analyzing diagnostic information, the method including: measuring the concentration of all mucin-1s (total MUC1) in a blood sample originated from a subject to be diagnosed; comparing the measured value with a threshold value; and estimating that a disease affecting the subject to be diagnosed is not prostate cancer but a benign prostate disease when the measured value of the concentration of total MUC1 is greater than the threshold value.

Abstract: An antigen detection method detects an antigen having a specific sugar chain in a sample with a lectin that binds to plural kinds of sugar chains including the specific sugar chain. The detection method includes: a first step of bringing the lectin into contact with the sample; a second step of bringing a glycohydrolase capable of cleaving at least one kind of sugar chain to which the lectin can bind into contact with the sample, the at least one kind of sugar chain excluding the specific sugar chain among the plural kinds of sugar chains; and a step of detecting the antigen bound with the lectin after the first and second steps.

Abstract: [Problem] An object of the present invention is to provide a method by which the amount of a very small amount of analyte (in particular, one having a sugar chain) can be measured with a high accuracy and a device which is used for said measurement method. [Means for Solution] The method for measuring the amount of an analyte according to the present invention is characterized in that a lectin labeled with a fluorescent dye, preferably said lectin whose dissociation rate constant [kd] is from 1.0×10?6 to 1.0×10?3 (S?1), is used as a secondary antibody in a sandwich assay using a surface plasmon excitation enhanced fluorescence spectroscopy [SPFS; Surface Plasmon-field enhanced Fluorescence Spectroscopy].