NR4A1 and female reproductive system neoplasm: Currently some clinical phase 1 trials are ongoing elucidating the use of endoxifen in adults with refractory hormone receptor-positive breast cancer, desmoid tumors, gynecologic tumors, or other hormone receptor-positive solid tumors (ClinicalTrials.gov Identifier: NCT01273168; last access date Nov 18, 2013) or in patients with metastatic or locally recurrent ER-positive breast cancer (ClinicalTrials.gov Identifier: NCT01327781; last access date Nov 18, 2013).