Background: Systemic lupus erythematosus (SLE) is one of the pregnancy complications which cause an increase in fetal and maternal complications which are mainly caused by placental damage due to chronic inflammation and apoptosis. The rate of apoptosis can be assessed by the high expression of caspase-3 which is the majorexecutioner caspases of apoptosis. The use of Mesenchymal Secretome Stem Cell for SLE therapy has an anti-inflammatory and anti-apoptotic role. This study aimed to examine the effect of mesenchymal secretome stem cell therapy toward caspase-3 expression in pregnant mice with pristan-induced lupus model. Subjects and Method: This study was a randomized controlled trial.