Background/Aim: This study aimed to determine the anxiolytic effect of a putative glyoxalase 1 inhibitor, piceatannol, as well as its antitumor activities on the stressinduced tumor growth of Lewis lung carcinoma. Materials and Methods: The anxiolytic activities of piceatannol (1-30 mg/kg) were assessed using the elevated plus maze (EPM) test. We also evaluated the pharmacological modulation of stress-induced tumor growth; the mice were treated with piceatannol (3 and 30 mg/kg) from the 10 th day till the 19 th day after administration of the LLC cells. Results: At the low dose (3 mg/kg), piceatannol significantly increased the time spent in the open arms of the EPM test when compared with the vehicle. At higher doses (30 mg/kg), it significantly suppressed the stress-induced enhancement of tumor growth. Conclusion: A low dose of piceatannol exerts an anxiolytic effect, and high doses have an antitumor effect.

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