ABSTRACT
The chronic-hypoxia-resistant gastric cancer cell line was established,and its biological characteristics were explored and compared with the parental cell line.Gastric cancer cell lines were cultured under the degressive oxygen concentration.Cell doubling time was calculated by cell counting method.Chemo-resistance ability of cells was tested by MTT assay.Irradiation tolerance of cells was evaluated by colony forming method.Cell cycle distribution was tested with flow cytometry.Invasive ability was tested by Transwell method.The expression levels of GLUT-1 and HIF-1α were detected by using Western blot.MNK45/HYP cells successfully survived under the 1％ concentration of oxygen and its cell doubling time was 35.01±1.02 h,while that of MNK45 was 27.35±0.83 h (P＜0.01).The percentage of MNK45/HYP cells in G0/G1 stage was (58.3±6.1)％,and that of MNK45 cells was (42.2±6.0)％ (P＜0.05).Comparing with the parental cells MNK45,drug resistance indexes of 5-Fu,PTX,OXA,Sn38,GEM and VP16 in MNK45/HYP cells were respectively 5.3,1.3,3.6,2.2,4.8 and 4.4.Colony forming ability of MNK45/HYP cells after irradiation was also significantly higher than MNK45 cells.The invasive number of MNK45/HYP cells was 107.7±17.5,while that of MNK45 cells was 59.0±9.9.The expression levels of GLUT-1 and HIF-1α in MNK45/HYP cells were significantly higher than those in MNK45 cells.MNK45/HYP cells hold biological characteristics of hypoxia tumor with good tolerance to chronic hypoxia,and can be used for the research of solid tumor under chronic hypoxia condition.
ABSTRACT
The benefit achieved by concurrent chemoradiotherapy (CCR) and sequential chemoradiotherapy (SCR) vs radiotherapy (RT) alone for patients with stage Ⅱ-Ⅳa nasopharyngeal carcinoma (NPC) was compared.A total of 113 patients with stage Ⅱ-Ⅳa NPC were allotted into CCR group (n=38),SCR group (n=36) and RT alone group (n=39).All patients were irradiated with the same RT technique to ≥66 Gy at 2 Gy per fraction,conventional 5 fractions/week in all groups.The CCR group received concurrent chemotherapy of weekly cisplatin for 7 weeks,and the SCR group received neoadjuvant and (or) adjuvant chemotherapy.The results showed that the 3- and 5-year overall survival rate was significantly higher in CCR group than in RT alone group (92.16％ vs 61.54％,81.58％ vs 51.28％,P＜0.005).The median survival time was significantly longer in CCR group than in RT alone group (67.8 months vs 52.7 months,P＜0.005).It was concluded that CCR could significantly improve overall survival rate,progression-free survival rate,and median survival time when compared with RT alone.
ABSTRACT
The inhibitory effects of Endostar in combination with radiotherapy in BALB/c nude mice model of human CNE2 nasopharyngeal carcinoma and the mechanism were investigated.In nude mice model of CNE2 nasopharyngeal carcinoma,the inhibitory rate and the sensitizing enhancement ratio (E/O) were calculated according to the tumor volumes in different groups.The expression of microvascular density (MVD) in tumor tissues was examined by using immunohistochemistry staining.The transcription of VEGF gene was detected by using RT-PCR.The inhibitory rate in Endostar+radiotherapy group was higher than in other groups.In Endostar+radiotherapy group,the tumor volume was significantly decreased and the E/O ratio was 2.335,suggesting that Endostar could be a radiosensitizer.The expression of MVD of tumor tissues in Endostar+radiotherapy group was reduced significantly.The expression of the MVD in treatment groups was significantly different from that in control group (P＜0.05).Compared to other groups,VEGF mRNA expression in Endostar+radiotherapy group was decreased remarkably.Endostar in combination with radiotherapy significantly inhibited the growth of CNE2 tumor.The combination therapy decreased the expression of VEGF,and inhibited tumor angiogenesis and proliferation.When combined with radiotherapy,Endostar acted as a radiosensitizer.