NR4A1 and breast cancer: These results are the same as studies conducted by Jansson which stated that PDGF expression is correlated with the occurrence of early recurrence in breast cancer.53 Another study conducted by Chou stated that breast cancer patients who get taxane chemotherapy tend to experience chemoresistance if they get over expression of PDGF.54 Another study stated that if PDGF expression in breast cancer patients is inhibited, it increases the effectiveness of hormonal therapy in patients with positive hormonal receptors.55