title: Radiation therapy after a partial response to CHOP chemotherapy for aggressive lymphomas.
abstract: OBJECTIVE
  To analyze the results with involved-field radiotherapy after aggressive lymphomas had decreased in size by 50-99% in response to cyclophosphamide, doxorubicin, vincristine, and prednisone (CHOP)-based chemotherapy.
  
  
  METHODS
  From 1988 through 1996, 294 previously untreated patients with Working Formulation intermediate-grade or large-cell immunoblastic lymphomas underwent CHOP-based chemotherapy on 2 consecutive protocols at the M. D. Anderson Cancer Center. Forty-four (15%) of these patients achieved, based on international working group guidelines, a partial (50-75%) response (n = 25), or unconfirmed complete (76-99%) response (n = 19) to a median of 6 cycles of chemotherapy. These patients were treated with salvage involved-field radiotherapy (n = 32) or chemotherapy (n = 12), e.g., MINE-ESHAP, without autologous stem-cell rescue (ASCR).
  
  
  RESULTS
  Median follow-up was 43 months. Partial responders experienced similar outcomes to unconfirmed complete responders. Local control (4-year rates: 86% vs. 53%, p = 0.009) and progression-free survival (4-year rates: 67% vs. 8%, p < 0.0001), but not overall survival (4-year rates: 70% vs. 50%, p = 0.067) were significantly better in those who received salvage radiotherapy, which was well tolerated.
  
  
  CONCLUSIONS
  Progression-free and overall survival in aggressive lymphoma patients who underwent salvage radiotherapy were similar to results reported for high-dose chemotherapy with ASCR. The role of salvage radiotherapy in partial and unconfirmed complete responders to CHOP chemotherapy justifies examination in a large, cooperative group trial.
authors.affiliation: Department of Radiation Oncology, University of Texas M. D. Anderson Cancer Center, Houston, TX 77030-4009, USA. rwilder@mdanderson.org
authors.forename: R B
authors.initials: RB
authors.lastname: Wilder
authors.forename: M A
authors.initials: MA
authors.lastname: Rodriguez
authors.forename: S L
authors.initials: SL
authors.lastname: Tucker
authors.forename: C S
authors.initials: CS
authors.lastname: Ha
authors.forename: M A
authors.initials: MA
authors.lastname: Hess
authors.forename: F F
authors.initials: FF
authors.lastname: Cabanillas
authors.forename: J D
authors.initials: JD
authors.lastname: Cox
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000008:administration & dosage / Q000627:therapeutic use*; D002945:Cisplatin / Q000008:administration & dosage; D003131:Combined Modality Therapy; D003520:Cyclophosphamide / Q000008:administration & dosage; D003561:Cytarabine / Q000008:administration & dosage; D018572:Disease-Free Survival; D004317:Doxorubicin / Q000008:administration & dosage; D005047:Etoposide / Q000008:administration & dosage; D006801:Humans; D007069:Ifosfamide / Q000008:administration & dosage; D016400:Lymphoma, Large-Cell, Immunoblastic / Q000188:drug therapy* / Q000532:radiotherapy*; D008228:Lymphoma, Non-Hodgkin / Q000188:drug therapy* / Q000532:radiotherapy*; D015080:Mesna / Q000008:administration & dosage; D008776:Methylprednisolone Hemisuccinate / Q000008:administration & dosage; D008875:Middle Aged; D008942:Mitoxantrone / Q000008:administration & dosage; D011241:Prednisone / Q000008:administration & dosage; D012189:Retrospective Studies; D016879:Salvage Therapy; D014750:Vincristine / Q000008:administration & dosage
chemical_list: D003561:Cytarabine; D008776:Methylprednisolone Hemisuccinate; D014750:Vincristine; D005047:Etoposide; D004317:Doxorubicin; D003520:Cyclophosphamide; D008942:Mitoxantrone; D015080:Mesna; D002945:Cisplatin; D007069:Ifosfamide; D011241:Prednisone