This study on the potentially elevated risk of breast cancer adds to the current knowledge of adverse events associated with antipsychotic use, such as stroke and myocardial infarction were investigated previously (Douglas and Smeeth, 2008; Sørensen et al., 2013; Lai et al., 2020), and use of prolactin-inducing antipsychotics was also reported to be associated with hip fractures (De Hert et al., 2016a). Here, PRL is linked to breast cancer.