title: Sequence of radiotherapy with tamoxifen in conservatively managed breast cancer does not affect local relapse rates.
abstract: OBJECTIVE
  To evaluate whether the sequencing of tamoxifen (TAM) relative to radiation (RT) affects outcome in breast cancer patients treated with conservative surgery (CS) plus RT (lumpectomy with RT).
  
  
  METHODS
  Between 1976 and 1999, 1,649 patients with stage I or II breast cancer were treated with CS plus RT at Yale-New Haven Hospital (New Haven, CT). TAM was administered to 500 patients. The timing of TAM relative to RT was documented for each patient. Of the 500 patients, the timing of TAM was unclear in five patients, was administered concurrently with RT in 254 patients (CON-TAM), and was administered sequentially after completion of RT in 241 patients (SEQ-TAM).
  
  
  RESULTS
  There were no differences between the CON-TAM and SEQ-TAM group in T stage, estrogen and progesterone status, nodal status, histology, or margin status. The CON-TAM group was slightly older than the SEQ-TAM group (62 v 58 years) and received chemotherapy in addition to TAM less frequently (14% v 38%). As of September 2002, with a median follow-up of 10.0 years, there were no significant differences between the CON-TAM and SEQ-TAM groups in overall survival (84% v 82%; hazard ratio [HR], 1.234; 95% CI, 0.42 to 2.05; P = .45), distant-metastasis-free rate (82% v 78%; HR, 1.55; 95% CI, 0.89 to 2.68; P = .12), ipsilateral breast-relapse-free rate (90% v 86%; HR, 0.932; 95% CI, 0.42 to 2.05; P = .86), or contralateral breast-relapse-free rate (95% v 93%; HR, 0.892; 95% CI, 0.53 to 1.48; P = .66).
  
  
  CONCLUSIONS
  Although the concurrent use of TAM with RT may theoretically render cancer cells less responsive to RT, this retrospective study suggests that in practical application, concurrent administration of TAM with RT does not compromise local control.
authors.affiliation: Albert Einstein College of Medicine of Yeshiva University, Bronx, NY, USA.
authors.forename: Peter H
authors.initials: PH
authors.lastname: Ahn
authors.forename: Ha Thanh
authors.initials: HT
authors.lastname: Vu
authors.forename: Donald
authors.initials: D
authors.lastname: Lannin
authors.forename: Edward
authors.initials: E
authors.lastname: Obedian
authors.forename: Michael P
authors.initials: MP
authors.lastname: DiGiovanna
authors.forename: Barbara
authors.initials: B
authors.lastname: Burtness
authors.forename: Bruce G
authors.initials: BG
authors.lastname: Haffty
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000970:Antineoplastic Agents / Q000008:administration & dosage*; D001943:Breast Neoplasms / Q000401:mortality / Q000628:therapy*; D003131:Combined Modality Therapy; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015412:Mastectomy, Segmental; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local; D009367:Neoplasm Staging; D011878:Radiotherapy / Q000379:methods; D012189:Retrospective Studies; D015996:Survival Rate; D013629:Tamoxifen / Q000008:administration & dosage*
chemical_list: D000970:Antineoplastic Agents; D013629:Tamoxifen