Method of assisting diagnosis of hematological tumor, method of obtaining data for diagnosis of hematological tumor, and kit for these methods

A method of obtaining data for diagnosis of a hematological tumor, the method comprising:

• the following (1) and (2);
• (1) measuring A which is an amount of kynurenic acid or measuring A which is an amount of kynurenic acid and B which is at least one amount selected from the group consisting of an amount of anthranilic acid, an amount of kynurenine, an amount of 3-hydroxyanthranilic acid, an amount of 3-hydroxykynurenine, and an amount of tryptophan in a subject-derived specimen, and
• (2) (i) using A obtained in the (1) as data for diagnosing a hematological tumor, (ii) calculating B/A, which is a ratio of B to A obtained in the (1), and using the calculated B/A as data for diagnosing a hematological tumor, or (iii) calculating A/B, which is a ratio of A to B obtained in the (1), and using the calculated A/B as data for diagnosing a hematological tumor.