In this study, we demonstrated the effects of CA on BPH in TP-induced BPH rats by measuring the prostate tissue weight, examining the histological changes, and evaluating the major factors involved in the biology of BPH such as prostate specific antigen (PSA), 5AR, AR, SRC1, estrogen receptor α (ERα), and mitogen-activated protein kinases (MAPKs). The gene discussed is NCOA1; the disease is benign prostatic hyperplasia.