title: The risk of early and late lung sequelae after conformal radiotherapy in breast cancer patients.
abstract: OBJECTIVE
  To study the risks of early and late radiogenic lung damage in breast cancer patients after conformal radiotherapy.
  
  
  METHODS
  Radiogenic lung sequelae were assessed prospectively in 119 patients by means of clinical signs, radiologic abnormalities, and the mean density change (MDC) of the irradiated lung on CT.
  
  
  RESULTS
  Significant positive associations were detected between the development of lung abnormalities 3 months or 1 year after the radiotherapy and the age of the patient, the ipsilateral mean lung dose (MLD), the radiation dose to 25% of the ipsilateral lung (D(25%)) and the volume of the ipsilateral lung receiving 20 Gy (V(20 Gy)). The irradiation of the axillary and supraclavicular lymph nodes favored the development of pneumonitis but not that of fibrosis. No relation was found between the preradiotherapy plasma TGF-beta level and the presence of radiogenic lung damage. At both time points, MDC was strongly related to age. Significant positive associations were demonstrated between the risks of pneumonitis or fibrosis and the age of the patient, MLD, D(25%), and V(20 Gy). A synergistic effect of MLD, D(25%), and V(20 Gy) with age in patients older than 59 years is suggested.
  
  
  CONCLUSIONS
  Our analyses indicate that the risks of early and late radiogenic lung sequelae are strongly related to the age of the patient, the volume of the irradiated lung, and the dose to it.
authors.affiliation: Department of Oncotherapy, University of Szeged, Szeged, Hungary. kahan@onko.szote.u-szeged.hu
authors.forename: Zsuzsanna
authors.initials: Z
authors.lastname: Kahán
authors.forename: Melinda
authors.initials: M
authors.lastname: Csenki
authors.forename: Zoltán
authors.initials: Z
authors.lastname: Varga
authors.forename: Elemér
authors.initials: E
authors.lastname: Szil
authors.forename: Adrienn
authors.initials: A
authors.lastname: Cserháti
authors.forename: Attila
authors.initials: A
authors.lastname: Balogh
authors.forename: Zsófia
authors.initials: Z
authors.lastname: Gyulai
authors.forename: Yvette
authors.initials: Y
authors.lastname: Mándi
authors.forename: Krisztina
authors.initials: K
authors.lastname: Boda
authors.forename: László
authors.initials: L
authors.lastname: Thurzó
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001943:Breast Neoplasms / Q000453:epidemiology* / Q000532:radiotherapy*; D005260:Female; D006801:Humans; D006814:Hungary / Q000453:epidemiology; D015994:Incidence; D008875:Middle Aged; D011832:Radiation Injuries; D017564:Radiation Pneumonitis / Q000453:epidemiology*; D020266:Radiotherapy, Conformal / Q000706:statistics & numerical data*; D018570:Risk Assessment / Q000379:methods*; D012307:Risk Factors; D013997:Time Factors