title: [Prognosis of primary non-Hodgkin's lymphoma of the breast].
abstract: OBJECTIVE
  To analyze the clinical characteristics and prognosis of primary non-Hodgkin's lymphoma of the breast (PNHLB).
  
  
  METHODS
  The characteristics, treatment methods and outcomes of 45 patients with PNHLB were retrospectively analyzed. Chemotherapy including CHOP and CHOP-like regimens was administered in 43 patients, and monoclonal antibody therapy in 6 patients. Furthermore, 19 patients underwent radiotherapy after chemotherapy.
  
  
  RESULTS
  Of these 45 patients, 37 patients had diffuse large B cell lymphoma (DLBCL), patients with T cell or mucosa-associated lymphoid tissue (MALT) lymphoma were 4, respectively. Overall response rate of first-line chemotherapy was 90.7%. Median overall survival (OS) and progression-free survival (PFS) of all patients was 6.82 and 4.25 years, respectively. The results of Cox regression model analysis showed that international prognostic index score (IPI) (RR = 5.682, P = 0.002) and Ann Arbor stage (RR = 1.836, P = 0.040) were negative independent prognostic factors for OS. Central nervous system involvement (RR = 1.107, P = 0.005) was a negative independent prognostic factor for PFS.
  
  
  CONCLUSIONS
  The patients with PNHLB have early occurrence in lifespan. Most pathologic type was DLBCL. IPI and Ann Arbor stage are two independent prognostic factors for survival.
authors.affiliation: Department of Medical Oncology, Cancer Hospital, Shanghai Medical College, Fudan University, Shanghai 200032, China.
authors.forename: Hai-Yi
authors.initials: HY
authors.lastname: Guo
authors.forename: Xin-Min
authors.initials: XM
authors.lastname: Zhao
authors.forename: Jun-Ning
authors.initials: JN
authors.lastname: Cao
authors.forename: Xi-Chun
authors.initials: XC
authors.lastname: Hu
authors.forename: Ji-Liang
authors.initials: JL
authors.lastname: Yin
authors.forename: Xiao-Nan
authors.initials: XN
authors.lastname: Hong
authors.forename: Jin
authors.initials: J
authors.lastname: Li