Relationship of serum levels of VEGF and TGF-β1 with radiosensitivity of elderly patients with unresectable non-small cell lung cancer

This study aimed to evaluate the relationship of serum levels of vascular endothelial growth factor (VEGF) and transforming growth factor-beta 1 (TGF-beta 1) with radiosensitivity of elderly patients with unresectable non-small cell lung cancer (NSCLC) receiving three-dimensional conformal radiation therapy (3D-CRT). Fifty-eight elderly patients with unresectable NSCLC and 40 healthy controls were enrolled in this study. Serum levels of VEGF and TGF-beta 1 were detected by the enzyme-linked immunosorbent assay (ELISA) method before and after 3D-CRT. Clinical performances of serum VEGF and TGF-beta 1 levels in predicting radiosensitivity of NSCLC patients with 3D-CRT were evaluated. Serum VEGF and TGF-beta 1 levels of NSCLC patients were higher than those of health controls (all p < 0.05). After 3D-CRT treatment, 41 patients achieved effective clinical response (complete response (CR) + partial response (PR)) and 17 patients were ineffective clinical response (stable disease (SD) + progressive disease (PD)). There was no significant difference in the VEGF and TGF-beta 1 levels between the effective and ineffective groups before 3D-CRT (all p > 0.05). Serum levels of VEGF and TGF-beta 1 after 3D-CRT in the effective group were lower compared with the levels before 3D-CRT treatment (p < 0.001 and 0.027, respectively). However, no significant differences in serum VEGF and TGF-beta 1 levels between before and after 3D-CRT in the ineffective group were observed (p = 0.196 and 0.517, respectively). We observed significant differences in serum VEGF and TGF-beta 1 levels between the effective and ineffective groups after 3D-CRT (p < 0.001 and 0.013, respectively). Sensitivity and specificity of VEGF combined with TGF-beta 1 in predicting radiosensitivity of NSCLC patients with 3D-CRT were 87.8 and 94.1 %, respectively. In conclusion, our results indicate that serum VEGF and TGF-beta 1 levels may accurately predict radiosensitivity of elderly patients with unresectable NSCLC receiving 3D-CRT.