TY - JOUR AU - Hoefnagel, L D; Moelans, C B; Meijer, S L TI - Prognostic value of estrogen receptor α and progesterone receptor conversion in distant breast cancer metastases JO - Cancer VL - 118 PY - 2012 DO - 10.1002/cncr.27518 SP - 4929 EP - 4935 N1 - et al. ER -