APAF1 and cancer: To evaluate the impact of styrax liquidus on the apoptosis and caspase pathway, apoptosis-related expression levels of the genes Bax, Bad, Bak1, p53, Bcl-2, Bcl-XL, Apaf-1, Caspase2, Caspase3a, Caspase9, and Caspase12 were determined in HEp-2 cancer cells.