We evaluated, in some cases for the first time, the effect of polymorphisms in multiple candidate genes on serum prolactin (PRL) levels in an AP-treated FEP cohort recruited in the multicenter PEPs study (Phenotype - genotype and environmental interaction; Application of a predictive model in first psychotic episodes).
However, increased prolactin levels (mlU/L) were found in patients suffering from the first psychotic episode who were not receiving antipsychotic therapy.