ABSTRACT
Objective:To explore the relationship between cardiac radiation dose and prognosis of patients with non-small cell lung cancer (NSCLC).Methods:From August 2015 to September 2018, the clinical data and cardiac dose parameters of 180 patients with locally advanced NSCLC who received radiotherapy in Tangshan people′s Hospital of Hebei Province were analyzed retrospectively.The relationship between cardiac dose parameters and overall survival rate was analyzed by K-M analysis, and the prognostic factors of NSCLC patients were identified by multivariate Cox regression.Results:The median survival time of NSCLC patients was 33.4 months.Univariate analysis indicated prescription dose≥56Gy ( HR 1.54, 95% CI1.28-2.86, P=0.011), hypertension ( HR 1.42, 95% CI1.34-1.89, P=0.012), mean cardiac dose≥13.9Gy ( HR 1.12, 95% CI1.05-2.61, P=0.031), V5≥70% ( HR 1.08, 95% CI1.01-2.16, P=0.044), and V30≥40% ( HR 1.16, 95% CI1.04-3.01, P=0.041), V50≥20% ( HR 1.23, 95% CI1.11-2.81, P<0.001), and V60≥5% ( HR 1.03, 95% CI1.00-1.89, P=0.037) were the prognostic factors of NSCLC patients.After multi-factor adjustments, receiving chemotherapy was a favorable factor for the prognosis of NSCLC patients ( HR 0.711, 95% CI0.35-0.89, P=0.005); hypertension was a factor of poor prognosis ( HR 1.641, 95% CI1.56-1.86, P=0.034); V50≥20% in cardiac dose ( HR 1.161, 95% CI1.13-3.82, P=0.002) was a poor prognostic factor in NSCLC patients. Conclusion:The cardiac dose V50 is an independent predictor of prognosis in patients with advanced NSCLC.The increase of cardiac radiation dose may increase the potential risk of death.In clinical practice, the prognosis of patients may be improved by reducing the cardiac radiation dose.