Postoperative pancreatic fistula (POPF) is the most common complication after pancreaticoduodenectomy (PD) and remains a challenge to pancreatic surgeons.In pancreaticojejunostomy,the methods of reconstruction,experience and operational techniques of surgeons are closely related to POPF.Based on a literature review and on personal experience,the author presented the basic requirements and principle in reconstructing a safe pancreaticojejunostomy (PJ).The traditional methods of pancreaticojejunostomy and their recent developments were evaluated,with their advantages and disadvantages compared.The indications of various types of PJ and the special skills required were summarized.According to his own experience,the author described in detail his recommended method of anastomosis.

Pancreatic cancer is one of the worst digestive malignancies characterized by non-specific symptoms, rapid progression and high mortality. Despite great efforts that have been made in basic and clinical research, the prognosis remains poor with an overall 5-year survival rate of less than 5%. Complete surgical resection is the only curative treatment option, but the curative resectabillty is still about 15% in China. Pancreatic surgery is considered one of the most techni-cally demanding and challenging procedures. The development of pancreatic surgery in China depends not only on the progress in surgical techniques, but also the specialization on pancreatic surgery. There has been advancement in combined therapy with a modern interdisciplinary approach including chemotherapy,radiotherapy, biotherapy and thermotherapy. The research pro-gress of gene therapy on pancreatic cancer showed us some hopes for the future. The outcome of pancreatic cancer treated by Chinese medicine with herbal drugs is encouraging, but still needs the support of more solid evidences from randomized con-trolled trials. It is suggested that the combined therapy should play an important role in the treatment of pancreatic cancer, and the fallow-up should be paid more attention.

Lymphatic metastasis is an important prognostic factor for pancreatic cancer.However,lymphatic metastatic status (N0 or N1) can not reflect the degree of lymphatic metastasis.Lymph node ratio,which is defined as the number of positive lymph nodes divided by total examined lymph nodes,can reflect the degree of lymph metastatic metastasis and give consideration to examined lymph nodes.Lymph node ratio is superior to lymph metastatic status in staging,guiding treatment,and predicting prognosis.However,currently,lymph node ratio cannot replace lymph metastatic status for the undetermined minimum number of examined lymph nodes and cut-off value.Further evidence is needed to prove its clinical value.

10.3969/j.issn.1007-3969.2013.05.011

Objectives To investigate the r el ationship between pancreatic ischemia and cytokines released in rats with acute pancreatitis(AP). Methods 20 acute edematous pancreatitis(AEP) and 20 acute necrotizing pancreatits(ANP) rat models wer e induced by injection of sodium taurocholate into the pancreatic duct, another 10 normal rats were used as control. At 12 hours after the induction of AP, 10 r ats in each group were sacrificed, blood and pacreatic tissue samples were taken for measurement of TNF-? and IL-10 levels. The pathological study of pancre as was performed, and pancreatic blood flow(PBF) was measured by Doppler ultraso und instrument.Results The TNF -? and IL-10 levels in serum and pancreatic tissue increased after the induction of AP, IL-10 levels elevated more significantly in AEP rats, TNF-? levels e levated more significantly in ANP rats. PBF reduced in AP rats, and the amplitud e of PBF measured by Doppler ultrasound was closely correlated with serum and ti ssue TNF-?, IL-10 levels, inflammation, hemorrhage and necrosis scores.Conclusion The reduction of PBF and the i ncreasement of cytokines developed simultaneously in rats with AP, hence both of them are important pathogenic factors of AP.

Objective To investigate the role of Stathmin in pancreatic cancer invasion and metastasis and its relationship with DNA methylation. Methods Immunohistochemical detection of MBDI and Stathmin protein expression in 40 cases of pancreatic cancer and 15 cases ot normal pancreatic tissue were performed,followed by analysis of their clinical and pathological relationship with pancreatic cancer; Human pancreatic cancer cell line BxPC-3 was treated with 5-Aza-2-dC (AZA).Both qRT-PCR and Western blot analysis of Stathmin expression were used before and after AZA treatment; Stathmin-siRNA transfected BxPC-3 cells were divided into the Stathmi-siRNA group and the empty vector control group.Transwell chamber invasion assay and animal experiment were performed to measure the changes in cell invasion and metastatic capability. Results lmmunohistochemistry showed positive MBDI and Stathmin expressions in 28 (70％) and 24 (60％) out of 40 cases of pancreatic cancer,respectively,which were significantly higher than that in the normal pancreatic tissue (P＜ 0.05); MBDI and Stathmin protein expressions were positively correlated (r =0.356,P =0.037),so were MBDI expression and lymph node metastasis (P=0.023).Stathmin expression was significantly correlated with clinical staging and lymph node metastasis (P =0.002,and P =0.001,respectively).After AZA treatment,both Stathmin mRNA and protein expression in BxPC-3 were significantly decreased.Transwell chamber invasion assay showed that compared with the control group,the cell invasion capability of the Stathmin-siRNA group was significantly decreased (P＜0.05).Animal experiment showed that the incidence of liver metastasis was significantly lower in the Stathmin-siRNA transfected group than the empty vector control group (P＜0.05).Conclusion Demethylation may contribute to the reduction of Stathmin expression in pancreatic cancer and further improve the prognosis of pancreatic cancer patients.

Objective To study the role of preoperative CA19-9 level in predicting resectability of pancreatic cancer.Methods Preoperative CA19-9 levels were determined by radioimmunoassay.The receiver operating characteristic curve was used to determine the cut-off point.The clinical value of the level of CA19-9 as a predictive marker of resectability was evaluated by the area under curve.Results The preoperative CA19-9 levels in the resectahle group was (313.6±515.5) kU/L,which was significantly lower than (852.1± 865.1)kU/L in the unresectable group (P＜0.001).The cut-off point of CA19-9 for predicting pancreatic cancer resectability was 312.1 kU/L,which had a sensitivity of 56.6％ and a specificity of 73.3％.The area under curve was 0.67.Conclusions The preoperative CA19-9 level may be used to predict resectability of pancreatic cancer.

ObjectiveTo explore the role of β-catenin in the proinvasive consequences of hypoxia in hepatocellular carcinoma (HCC).MethodsWe established in vitro and in vivo hypoxic models using the highly metastatic MHCC97 and the stable red fluorescent protein-expressing MHCC97-R cells.The role of β-catenin in hypoxia-mediated aggressiveness was investigated by β-catenin knockdown.ResultsHypoxia caused a pronounced arrest of proliferation in MHCC97 cells,suppressed tumor growth in MHCC97-R xenografts,but promoted in vitro invasiveness and in vivo metastasis.β-Catenin-silencing by short hairpin significantly inhibited the enhanced invasiveness of MHCC97 cells due to hypoxia,reduced the increase in distant metastasis by hepatic arterial ligation,but failed to further restrain cell proliferation.Conclusionβ-Catenin in HCC cells plays an essential role in the hypoxia-induced metastatic potential.A reduction of βcatenin expression inhibited the proinvasive consequences of hypoxia in HCC.

Objectives To investigate preparation of gemcitabine albumin nanoparticles, and its property of slow-release, the cytotoxic effect on pancreatic cancer cells (PANC1) in vitro, for improving the effect of regional intra-arterial infusion chemotherapy in pancreatic cancer with new medicament in the future. Methods The gemcitabine albumin nanoparticles were prepared with bovine serum albumin and gemcitabine with the desolvation-crosslink method, the concentration of gemcitabine was detected by high performance liquid chromatography (HPLC). The cytotoxic effect on pancreatic cancer cells in vitro were detected with MTT colorimetric assay. Results The mean diameter of gemcitabine albumin nanoparticles was (156.2±2.2) nm, and Zeta potential was (-20.4±1.41)mV, drug loading was 10.8%, drug release time in virto was 3 hours respectively. Gemcitabine albumin nanoparticles (0.01～50 μg/ml) had a 31%～44% inhibitory rate on PANC1 cell, which was similar to the inhibitory rate of same concentration of gemcitabine (26%～47%). Conclusions The new preparation of gemcitabine albumin nanoparticles had obvious drug slow-release effect, which may help improve the effect of regional intra-arterial infusion chemotherapy for pancreatic cancer.

Objective To describe the hemodynamic characteristics of normal pancreas and pancreatic tumors by 64 slices helical CT perfusion imaging, to evaluate the role of CT perfusion in the diagnosis of pancreatic tumors. Methods Perfusion CT scan was performed in 149 patients, including 36 patients with normal pancreas, 105 patients with pancreatic tumors and 8 patients with duodenal papillary carcinoma. The parameters including blood flow (BF) ,blood volume (BV) and permeability surface area product (PS) were measured. Results The mean value of BF, BV and PS of normal pancreas were (135.24±48.36) ml· min-1·kg-1, (200.55±54.96)ml/kg and (49.75±24.27) ml·min-1·kg-1, respectively. Pancreatic carcinoma has a lower BF, BV and PS,whieh were 31.77±19.36 ml·min-1· kg-1, (66.84±39.49)ml/kg and (37.64±27.14) ml·min-1·kg-1, respectively. The aforementioned parameters in pancreatic cysts were close to zero. The parameters in pancreatic carcinoma were significantly lower than those in normal pancreas(P<0.05); the BF and BV in duodenal papillary carcinoma were significantly lower than those in normal pancreas(P<0.05), while the value of PS was not significantly different from that in normal pancreas; the aforementioned parameters in pancreatic cysts were significantly different from those in normal pancreas(P <0.01). Conclusions In perfu sion CT, normal pancreas was an organ with symmetrical BF,BV and PS. Pancreatic carcinoma was a tumor with low perfusion and decreased PS. Duodenal papillary carcinoma had decreased BF and BV with no significant change in PS. Pancreatic cyst had no blood perfusion. The 64 slice helical CT peffusion imaging was invaluable in differential diagnosis of pancreatic tumors.