Radiation-induced pulmonary injury: symptomatic versus subclinical endpoints.

Published

Journal Article

PURPOSE: To assess the relationship between radiation (RT)-induced pulmonary symptoms and subclinical changes in pulmonary functions tests (PFT) and radiographs. MATERIALS AND METHODS: A total of 184 patients irradiated between 1992 and 1998 were prospectively evaluated for RT-induced pulmonary symptoms, changes in computed tomography (CT) density, reductions in single photon emission CT (SPECT) perfusion, and changes in pulmonary functions tests (forced expiratory volume in 1 s [FEV1] and diffusion capacity to carbon monoxide [DLCO]). Comparisons between the evaluable patients with (N=34) and without (N=106) RT-induced pulmonary symptoms were made. RESULTS: Within 6 months of RT, 80% of the RT-induced symptoms were noted. There was no association between the presence or absence of RT-induced pulmonary symptoms and the frequency of RT-induced radiographic changes (p=0.53), or in the dose-response curve for RT-induced reductions in regional perfusion. Overall, RT-induced changes in SPECT images were more commonly seen than increased density changes on CT (p<0.001). Most patients with pulmonary symptoms had relatively low pre-RT PFTs and experienced further declines following RT. CONCLUSIONS: Regional radiographic changes in CT-defined tissue density or SPECT-defined tissue perfusion are similar in patients with and without RT-induced pulmonary symptoms because these endpoints do not consider the volume of lung affected. RT-induced pulmonary symptoms are better related to post-RT PFT because they are an assessment of whole lung function. Additional studies are necessary to better define models that can predict the degree of radiation-induced changes in whole lung function.

Full Text

Duke Authors

Cited Authors

  • Marks, LB; Fan, M; Clough, R; Munley, M; Bentel, G; Coleman, RE; Jaszczak, R; Hollis, D; Anscher, M

Published Date

  • April 2000

Published In

Volume / Issue

  • 76 / 4

Start / End Page

  • 469 - 475

PubMed ID

  • 10815626

Pubmed Central ID

  • 10815626

Electronic International Standard Serial Number (EISSN)

  • 1362-3095

International Standard Serial Number (ISSN)

  • 0955-3002

Digital Object Identifier (DOI)

  • 10.1080/095530000138466

Language

  • eng