Abstract
We hypothesize that the correlation between the radiation dose expressed as the biologically effective dose (BED) and the clinical endpoints will correlate better as the value of the α / β ratio is increased to >10 Gy, which theoretically minimizes the overestimation of the dose potency associated with the linear quadratic (LQ) formula in the setting of stereotactic body radiation therapy (SBRT) for early stage non-small cell lung cancer (NSCLC). A search was conducted in the PubMed electronic databases in August 2011. In the studies analyzed, increasing the α / β ratio is associated with an increase in the strength of the correlation between isocenter BED and local control, especially in the studies with median followup of ≥24 months, for which Spearman's correlation coefficients of 0.74-0.76 were achieved for α / β of 20 Gy, 30 Gy, and 50 Gy (P = 0.007-0.008). A trend toward statistical significance was observed for the correlation of isocenter BED and the 2-year overall survival when an α / β of 20 Gy was used approached statistical significance (P = 0.073). Our results suggest that an α / β > 10 Gy may be more appropriate for the prediction of dose response in the setting of lung SBRT.
Original language | English (US) |
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Article number | 391021 |
Journal | BioMed research international |
Volume | 2013 |
DOIs | |
State | Published - 2013 |
ASJC Scopus subject areas
- General Immunology and Microbiology
- General Biochemistry, Genetics and Molecular Biology