Prediction of treatment response by genetic biomarkers has potential for clinical use and contributes to the understanding of pathophysiology and drug mechanism of action. The purpose of this study is to detect genetic biomarkers possibly associated with response to lurasidone, during the first four weeks of treatment. One-hundred and seventy-one acutely psychotic patients from two placebo-controlled clinical trials of lurasidone were included. Genetic associations with changes in Positive and Negative Syndrome Scale total score at weeks one, two, and four were examined. Genotyping was done with the Affymetrix 6.0 microarray and associations were computed using PLINK regression model. Although genome-wide significance was not reached with a limited sample size, signals of potential interest for further studies were with genes important for neurogenesis. Possible week one marker, rs6459950 (p = 7.05 × 10