The risk of early and late lung sequelae after conformal radiotherapy in breast cancer patients.
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.
Kahán
Zsuzsanna
Z
Department of Oncotherapy, University of Szeged, Szeged, Hungary. kahan@onko.szote.u-szeged.hu
Csenki
Melinda
M
Varga
Zoltán
Z
Szil
Elemér
E
Cserháti
Adrienn
A
Balogh
Attila
A
Gyulai
Zsófia
Z
Mándi
Yvette
Y
Boda
Krisztina
K
Thurzó
László
L
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