Abstract: A method for predicting a therapeutic effect of chemotherapy with a combination drug containing tegafur, gimeracil, and oteracil potassium in a gastric cancer patient by: (1) measuring an expression level of epidermal growth factor receptor (EGFR) in a biological sample obtained from the patient; (2) comparing the expression level of EGFR obtained in step (1) with a corresponding predetermined cut-off point; and (3) predicting that the patient is likely to sufficiently respond to chemotherapy when a tegafur, gimeracil, and oteracil potassium combination drug is used with an EGFR inhibitor, when the step (2) comparison reveals that the expression level of EGFR is greater than the cut-off point, or predicting that the patient is likely to sufficiently respond to chemotherapy when a tegafur, gimeracil, and oteracil potassium combination drug is used alone, when the step (2) comparison reveals that the expression level of EGFR is not greater than the cut-off point.

Abstract: A method for predicting a therapeutic effect of chemotherapy with a combination drug containing tegafur, gimeracil, and oteracil potassium in a gastric cancer patient by: (1) measuring an expression level of epidermal growth factor receptor (EGFR) in a biological sample obtained from the patient; (2) comparing the expression level of EGFR obtained in step (1) with a corresponding predetermined cut-off point; and (3) predicting that the patient is likely to sufficiently respond to chemotherapy when a tegafur, gimeracil, and oteracil potassium combination drug is used with an EGFR inhibitor, when the step (2) comparison reveals that the expression level of EGFR is greater than the cut-off point, or predicting that the patient is likely to sufficiently respond to chemotherapy when a tegafur, gimeracil, and oteracil potassium combination drug is used alone, when the step (2) comparison reveals that the expression level of EGFR is not greater than the cut-off point.

Abstract: An antitumor effect fortifier comprising as an active ingredient an effective amount of platinum (II) cis-oxalato(1R,2R-diaminocyclohexane) so as to enhance the antitumor activity of antitumor agent containing a therapeutically effective amount of tegafur, an amount, effective for the enhancement of antitumor effect, of gimeracil and an amount, effective for the suppression of side effects, of oteracil potassium; and a relevant antitumor agent. Further, there is provided a method of therapy for cancer, characterized in that an amount, effective for the enhancement of antitumor effect, of platinum (II) cis-oxalato(1R,2R-diaminocyclohexane) is concomitantly administered to a mammal.

Abstract: A DNA array for measuring sensitivity to an antimetabolite-type anticancer agent or a combined use of such an anticancer agent and another anticancer agent, characterized by including at least 13 types of target gene fragments, involving at least two types of genes selected from each of the following groups: nucleic acid metabolism-associated enzyme genes, gene repair-associated enzyme genes, drug resistance-associated factor genes and housekeeping genes, wherein these gene fragments have been selected by the following steps 1) and 2) and immobilized on a substrate; 1) a step of selecting fragments having high specificity for target genes by searching the homology with the use of databases; and 2) a step of performing Northern hybridization against RNA obtained from tumor cells with the use of the fragments selected in the step 1) as probes to thereby confirm the specificity for the target genes.