Clinical trial of thalidomide combined with radiotherapy in patients with esophageal cancer

Table 2 Dynamic changes in vascular endothelial growth factor levels in 83 evaluable esophageal cancer patients

Group	n	Before radiotherapy	During radiotherapy	After radiotherapy
Drug group	32	98.56 ± 28.74	122.69 ± 43.03d	109.53 ± 32.48b
Non-drug group	51	141.76 ± 53.78	100.94 ± 22.61f	100.31 ± 23.45

^bP < 0.01 vs during radiotherapy (drug group);

^dP < 0.01 vs before radiotherapy (drug group);

^fP < 0.01 vs before radiotherapy (non-drug group).