PRL and schizophrenia: The relationship of the serum levels of testosterone [7–13], prolactin [7, 8], dehydroepiandrosterone (DHEA) and/or its sulfate conjugate (DHEA-S) [8, 11–13], ACTH [9], cortisol [9, 12, 13], progesterone [7, 9], gonadotropins [7], and estradiol [8, 13] with schizophrenia have been evaluated by some studies and diverse findings have been obtained.