Abstract
BackgroundTo evaluate the association between the clinical, dosimetric factors and severe acute radiation pneumonitis (SARP) in patients with locally advanced non-small cell lung cancer (LANSCLC) treated with concurrent chemotherapy and intensity-modulated radiotherapy (IMRT).MethodsWe analyzed 94 LANSCLC patients treated with concurrent chemotherapy and IMRT between May 2005 and September 2006. SARP was defined as greater than or equal 3 side effects and graded according to Common Terminology Criteria for Adverse Events (CTCAE) version 3.0.The clinical and dosimetric factors were analyzed. Univariate and multivariate logistic regression analyses were performed to evaluate the relationship between clinical, dosimetric factors and SARP.ResultsMedian follow-up was 10.5 months (range 6.5-24). Of 94 patients, 11 (11.7%) developed SARP. Univariate analyses showed that the normal tissue complication probability (NTCP), mean lung dose (MLD), relative volumes of lung receiving more than a threshold dose of 5-60 Gy at increments of 5 Gy (V5-V60), chronic obstructive pulmonary disease (COPD) and Forced Expiratory Volume in the first second (FEV1) were associated with SARP (p < 0.05). In multivariate analysis, NTCP value (p = 0.001) and V10 (p = 0.015) were the most significant factors associated with SARP. The incidences of SARP in the group with NTCP > 4.2% and NTCP ≤4.2% were 43.5% and 1.4%, respectively (p < 0.01). The incidences of SARP in the group with V10 ≤50% and V10 >50% were 5.7% and 29.2%, respectively (p < 0.01).ConclusionsNTCP value and V10 are the useful indicators for predicting SARP in NSCLC patients treated with concurrent chemotherapy and IMRT.
Highlights
To evaluate the association between the clinical, dosimetric factors and severe acute radiation pneumonitis (SARP) in patients with locally advanced non-small cell lung cancer (LANSCLC) treated with concurrent chemotherapy and intensity-modulated radiotherapy (IMRT)
Univariate analyses showed that the normal tissue complication probability (NTCP), mean lung dose (MLD), relative volumes of lung receiving more than a threshold dose of 5-60 Gy at increments of 5 Gy (V5-V60), chronic obstructive pulmonary disease (COPD) and Forced Expiratory Volume in the first second (FEV1) were associated with SARP (p < 0.05)
NTCP value and V10 are the useful indicators for predicting SARP in nonsmall cell lung cancer (NSCLC) patients treated with concurrent chemotherapy and IMRT
Summary
To evaluate the association between the clinical, dosimetric factors and severe acute radiation pneumonitis (SARP) in patients with locally advanced non-small cell lung cancer (LANSCLC) treated with concurrent chemotherapy and intensity-modulated radiotherapy (IMRT). Many studies showed that dose and volume of radiation to lung are associated with the risk of radiation pneumonitis, such as mean lung dose (MLD) [7,8,9,10,11], normal tissue complication probability (NTCP) [8,12,13] value and relative volume of lung receiving more than a threshold dose (Vdose) [7,10,14,15,16,17,18,19] Technology such as intensity-modulated radiotherapy (IMRT) that could reduce the dose and volume of radiation to lung would potentially decrease the risk of severe radiation pneumonitis, as demonstrated in a planning study by Musherd [20] et al Further more, Yom et al reported that IMRT was associated with a significantly reduced radiation pneumonitis rate in NSCLC patients treated with concurrent chemotherapy and so far, this is the only study that looked at concurrent chemotherapy and IMRT [21]. More clinical evidence on using IMRT in treating lung cancer is needed
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