Method for predicting therapeutic effect on colorectal cancer patients with enhanced expression of TK1 protein

摘要

The present invention provides a method for predicting the therapeutic effect of chemotherapy using an antitumor agent containing trifluridine and tipiracil hydrochloride at a molar ratio of 1:0.5 on a colorectal cancer patient, the method comprising the following steps (1) to (3). As the means for solving the problem, the following invention is provided: a method comprising (1) detecting the expression of TK1 protein by an immunohistochemical method in tumor cells contained in a biological sample obtained from the patient; (2) based on the detection results obtained in step (1), classifying the tumor cells into positive cells and negative cells, and calculating the percentage of positive cells in the tumor cells; and (3) based on the calculation results obtained in step (2), predicting that when the percentage is 30% or more, the patient is likely to sufficiently respond to chemotherapy using the antitumor agent containing trifluridine and tipiracil hydrochloride at a molar ratio of 1:0.5.