title: A case of synchronous relapse of breast cancer and uterine müllerian adenosarcoma post tamoxifen in a premenopausal woman.
abstract: OBJECTIVE
  We report a case of a 42-year-old multigravida, premenopausal woman with breast carcinoma, who presented after four years of use of adjuvant tamoxifen with synchronous liver, bone, and lung metastasis of breast cancer with müllerian adenosarcoma.
  
  
  RESULTS
  Immunohistochemical stains on the uterine tumor for estrogen and progesterone receptors showed positivity for both epithelial and stromal cells, actin, and desmin while the proliferative index (MIB-1) showed positivity for stromal cells only. The patient underwent a hysterectomy followed by palliative chemotherapy. She died 14 months after her relapse because of progressive disease (cerebral, bone, liver and lung metastases).
  
  
  CONCLUSIONS
  Our case is the only one reported in the literature with synchronous relapse of breast adenocarcinoma and a Müllerian adenosarcoma. Moreover, it is one of the rare cases occurring in a premenopausal woman since all except two cases were postmenopausal.
authors.affiliation: Division of Hematology-Oncology, Hammoud Hospital University Medical Center Saida, Lebanon. drfadi@terra.net.lb
authors.forename: F
authors.initials: F
authors.lastname: Farhat
authors.forename: N
authors.initials: N
authors.lastname: Fakhruddine
mesh_terms: D018195:Adenosarcoma / Q000139:chemically induced / Q000473:pathology*; D000328:Adult; D001943:Breast Neoplasms / Q000188:drug therapy* / Q000473:pathology; D005260:Female; D006801:Humans; D018200:Mixed Tumor, Mullerian / Q000139:chemically induced / Q000473:pathology*; D009362:Neoplasm Metastasis; D009364:Neoplasm Recurrence, Local / Q000150:complications*; D017697:Premenopause; D013629:Tamoxifen / Q000009:adverse effects*; D017211:Treatment Failure; D014594:Uterine Neoplasms / Q000139:chemically induced / Q000473:pathology*
chemical_list: D013629:Tamoxifen