ABSTRACT
Objective To compare the short-term effect of laparoscopic surgery with open surgery for gastrointesti﹣nal stromal tumor. Methods 26 patients, whose tumor were localized and the pathologic diagnosis were gastrointesti﹣nal stromal tumor in stomach after surgery, were randomly divided into laparoscopic surgery group (n=12) and open surgery group (n= 14). The age and gender level, disease duration, clinical symptom, tumor location, and the lesion diameter were similar between the two groups (P> 0.05). Surgery achievement, intraoperative blood loss, operative time, postoperative hospital stay, postoperative flatus time, postoperative liquid time, and incidence rates of postoper﹣ative complications were compared between the two groups. Results All the patients get successful R0 resection. The volume of intraoperative blood loss, operative time, postoperative hospital stay, postoperative flatus time, and postop﹣erative liquid time in laparoscopic surgery group were lower than open surgery group (P 0.05). Conclusion Compared with open surgery, the short-term effect of laparoscopic surgery were better for patients whose gastrointestinal stromal tumor in stomach were localized, and it is worth of promoting clinical application.
ABSTRACT
Human hepatocarcinoma cells, HepG2 were cultured onto biodegradable polyglycolic acid (PGA) polymer scaffolds, which were cultured in a rotating cell culture system (RCCS) to form a three-dimensional (3D) multicellular culture in vitro. The RCCS can simulate microgravity effects with low shear stress and well exchanging for gas. Then the growth characteristics and some mechanism of the cells in RCCS were detected by scanning electron microscopy (SEM), transmission electron microscopy (TEM), RT-PCR and flow cytometry (FCM). The results indicate that the cells grew well with polyhedron morphology and lots of microvilli, mitochondria and tight junctions in this system, which means that this system is useful for cells to form 3D structure to mimic cell status in vivo. The expression of some cell adhesion molecules (CAMs) were changed markedly, which are closely associated with cancer invasion and metastasis. The characters of increased expression of integrin ?1(CD29), CD44, intercellular adhesion molecule-1(CD54) and depressed expression of E-cadherin presumably show that the HepG2 cells cultured in RCCS could recur some characters of primary liver cancer in vivo, the capacity of invasion and metastasis. It is necessary for acquiring perfect and external results to select an appropriate research model for studying in vitro. This 3D culture in vitro under simulated microgravity can provide a useful and reasonable model for oncology, anticancer drugs research and other research.
ABSTRACT
Objective To establish a method for determination of psoralen and isopsoralen in Bushen Jiannao Soft Capsule. Methods The HPLC separation was performed on Diamonsil-C18 (250 mm?4.6 mm, 5 ?m) column with a mixture methanol-water (48∶52) as the mobile phase, at a flow rate of 1.0 mL/min. Detection wavelength was at 246 nm, and column temperature at 40 ℃. Results The linear response of psoralen and isopsoralen ranged from 0.010 08～0.252 ?g (r=0.999 8) and 0.009 14～0.228 5 ?g (r =0.999 9). The average recovery was 98.91% (RSD=1.74%) and 99.93% (RSD=1.27%) respectively. Conclusion The method is simple, accurate, and suitable for the determination of the psoralen and isopsoralen in the preparations.