Objective To study the expression and significance of monocyte chemotactic protein 1 (MCP-1) in the process of early radiation-induced lung injury in mice.Methods 40 mice were randomly divided into control group (10 cases) and post-irradiation group (30 cases).A large dose (15 Gy) irradiation on chest was performed in post-irradiation group.Every 10 mice in this group were killed on the 1st day (RT1d),the 10th day (RT10d),the 30th day (RT30d),respectively,and the specimens were collected.The expression of MCP-1 mRNA was detected by quantitative real-time PCR (RT-PCR),and MCP-1 and IL-6 proteins in BALF were detected by ELISA.The pathological changes of lung tissue were observed with HE staining.Results Under the microscope,lung tissue began to show inflammation on the 10th day and was more seriousness on the 30th day in post-irradiation group.Immunohistochemistry staining showed that the expression of MCP-1 in lung tissue irradiated was increased.RT-PCR results showed that the relative expressions of MCP-1 mRNA in control group,RT1d group,RT10d group and RT30d group were 7.63±0.77,6.81±0.75,5.75±0.73 and 4.61±0.75,respectively.The differences between RT1d group and control group,RT10d and RT1d group,and RT30d and RT10d were significantly different (all P ＜ 0.05).ELISA results showed that the levels of MCP-1 and IL-6 proteins in post-irradiation group were significantly higher than those in the control group (P ＜ 0.05).Conclusion The expression of MCP-1 in mice after irradiation is abnormal,and MCP-1 may participate in early radiation-induced lung injury.

Objective To evaluate the efficacy and toxicity of capecitabine combined with intensity modulated radiotherapy( IMRT)for postoperative mediastinal lymph node metastasis in esophageal cancer. Methods A total of 62 esophageal cancer patients with postoperative mediastinal lymph node metastases were randomly divided into the irradiation group(A group,31 cases)and the capecitabine combined with IMRT group( B group,31 cases). Both of two groups received IMRT radiotherapy with a total dose of 60-66 Gy, 30-33 times in 6-6. 5 weeks. The patients in B group were treated with capecitabine(1 250mg/ m2 ,2 f/ d, d1-d14,21 d × 2 cycle). Results Group A:there were 7 cases of complete response(CR),12 of partial response(PR),10 of stable disease(SD),and 2 of progressive disease(PD);the effective rate was 61. 3%(19 / 31). Group B:there were 10 cases of CR,16 of PR,4 of SD,and 1of PD;the effective rate was 83. 9%(26 / 31). There was a statistical significance between the effective rates of A group and B group(χ2 = 3. 971, P < 0. 05). Our experiment showed that the rates of grade Ⅱand Ⅲ myelosuppression in group A and group B were 29. 0% and 38. 7%(χ2 = 0. 648,P = 0. 421). The rates of Ⅰ and Ⅱ level radioactive pneumonia in group A and were 19. 4% and 25. 8%(χ2 = 0. 369,P = 0. 544). The different incidence of the two adverse reactions between group A and B had no statistical significance. Conclusion Compared with IMRT alone,IM-RT combined with capecitabine may have better curative efficacy without increasing toxicity to esophageal cancer patients with postoperative mediastinum lymphonode metastasis.