CYP11A1 and neoplasm: It was also found that YC could promote the synthesis of testosterone in mouse Leydig tumor cells-1 by increasing the expression of steroidogenic acute regulatory protein (StAR), cytochrome P450, family 11, subfamily A, polypeptide 1 (CYP11A1), and 3-hydroxysteroid dehydrogenase/isomerase (3-HSD) mRNAs and proteins [11].