To study the mechanism of p16,Cyclin D1 and CDK4 and their relationship with pancreatic carcinoma, their expressions were examined by immunchistochemistry methods. Results: overpression of Cyclin D1 and CDK4 was revealed in these samples and p16 was undertectable. There was a negitive correlation between p16 and Cyclin D1 (Ｐ＜0.05), and a positive relation between Cyclin D1 and CDK4 (Ｐ＜0.05). The results indicate that abnormality of p16, Cyclin D1 and CDK4 may be involved in the molecular mechanism of pancreatic carcinoma, p16 lower expression and Cyclin D1 over expression may coexit in the development of pancreatic carcinoma.
ObjectiveTo study the value of Gd-DTPA three dimension fast spoiled gradientecho (3D FSPGR) dynamic MRI in the diagnosis and preoperative respectability assessment of pancreatic carcinoma.MethodsThirty-two cases of pancreatic carcinoma verified by surgery and pathology were included in this study. All of the cases had MRI examinations two weeks before surgery. MRI protocols involved gradient echo T1 weighted（GRE T1W） with fat suppression, fast spin echo respiratory gating T2 weighted (FSE RG T2W) with fat suppression, MR cholangiopancreatography (MRCP) and gadolinium chelate 3D FSPGR T1W dynamic enhancement. Two radiologists reviewed MRI of the 32 cases retrospectively. Preoperative resectability of pancreatic carcinoma was assessed according to the characteristics of tumor lesions, peripancreatic invasion, vascular invasion, lymph node metastases, and liver metastases. The diagnosis and preoperative resectability assessment of pancreatic carcinoma by MRI was compared with surgical findings. ResultsOf 32 cases, 29 cases diagnosed by MRI were confirmed by surgery and pathology (accuracy of MRI, 90.6%). The sensitivity was 84.4%(27/32) and 93.8%(30/32) respectively for GRE T1W with fat-suppression combining FSE RG T2W and for Gd-DTPA 3D FSPGR dynamic MRI in the detection of pancreatic tumors. The accuracy was 87.5%（21/24）, 87.0%（20/23）, 80.0%（12/15）, 88.9%（8/9） and 83.3%（5/6） respectively for Gd-DTPA 3D FSPGR dynamic MRI in assessing local extension, vascular invasion, lymph node metastases, liver metastases and peritoneal carcinomatosis of pancreatic carcinoma. Eight cases of pancreatic carcinoma were considered to be resectable by enhanced MRI, while the tumors in 7 cases of the 8 cases were resected by surgery. Twentythree cases were confirmed nonresectable by surgery in the 24 cases of pancreatic carcinoma considered to be non-resectable by enhanced MRI. The sensitivity, specificity and accuracy were 87.5%，95.8% and 93.8% resectability for the assessment of respectability of pancreatic carcinoma by using Gd-DTPA 3D FSPGR dynamic MRI. There was no significant difference in the assessment of the resectability of pancreatic carcinoma between enhanced MRI and surgery or pathology （κ=0.83）.ConclusionUsing of Gd-DTPA 3D FSPGR dynamic enhanced MRI improves the detections of pancreatic carcinoma and metastasis. It is also accurate in the assessment of the resectability of pancreatic carcinoma.
Objective To investigate the value of MR diffusion-weighted imaging (DWI) in differentiating pancreatic carcinoma from chronic focal pancreatitis on 3.0 T MR system. Methods Thirteen patients with proved pancreatic carcinoma, 7 patients with confirmed chronic focal pancreatitis, and 14 healthy volunteers, were included in this study. MR examination including the routine abdomen scanning protocol and DWI was performed for both patients and volunteers. The SE-EPI sequence and ASSET technique were used for DWI. The b values of 400, 600, 800 and 1 000 s/mm2 were selected to acquire the DWI. The corresponding apparent diffusion coefficient (ADC) values were measured in each designated region of interest and statistically analyzed. Results ①DWI of the healthy volunteers showed intermediate signals of pancreas. ②DWI of pancreatic tumor masses showed homogenous high signal intensity relative to the surrounding pancreatic tissue with clear boundary. Under different b values, the tumor ADC values were (1.63±0.235)×10-3 mm2/s, (1.42±0.126)×10-3mm2 /s, (1.36±0.170)×10-3 mm2 /s and (1.26±0.178)×10-3 mm2 /s respectively, which were significantly lower than those of non-tumor region 〔(2.11±0.444)×10-3 mm2 /s, (1.83±0.230)×10-3 mm2 /s, (1.81±0.426)×10-3 mm2 /s, (1.60±0.230)×10-3 mm2 /s〕 and of the normal pancreas 〔(1.85±0.350)×10-3 mm2 /s, (1.69±0.290)×10-3 mm2 /s, (1.67±0.268)×10-3 mm2 /s, (1.42±0.221)×10-3 mm2 /s〕， P＜0.05. ③DWI of chronic focal pancreatitis showed inhomogeneous slightly hyper-intense signal with blurring borders. Under different b values, the ADC values of the inflammatory masses of chronic pancreatitis were (169±0.150)×10-3 mm2 /s, (1.56±0.119)×10-3 mm2 /s, (1.59±0.172)×10-3 mm2/s and (1.35±0.080)×10-3 mm2 /s respectively, which were higher than those of pancreatic carcinoma. When b value was set to 800 s/mm2 , the difference in ADC values between pancreatic carcinoma and chronic focal pancreatitis was statistically significant (P＜0.05). Conclusion MR DWI can clearly depict the tumor mass of pancreatic carcinoma. In addition, the measurement of ADC values can provide useful information for the differential diagnosis between pancreatic carcinoma and chronic focal pancreatitis.
ObjectiveTo explore the new gene therapy method for tumor, the recombinant Caspase3 gene (rcaspase3) eukaryotic expression plasmid was constructed by molecular biologic method. MethodsThe eukaryotic expression plasmid pcDNA3.1(+)/rCaspase3 was constructed by rearrangement of the large subunit and small subunit of Caspase3 and it was transfected into pancreatic carcinoma cells(PCⅡ). After being transfected, the expression of rCaspase3 mRNA in pancreatic carcinoma cells was detected by RTPCR and it’s apoptotic activity was detected by FCM. ResultsThe sequence of rCaspase3 showed that the recombinant molecules (rCaspase3) now had its’ small subunit preceding its’ large subunit. After pancreatic carcinoma cells being transfected with the pcDNA3.1(+)/rCaspase3 by liposomes, a 894 bp strap was observed by RTPCR. No strap was found in control groups. A transparent hypodiploid karyotype peak was found by FCM.ConclusionThe plasmid of pcDNA3.1(+)/rCaspase3 has been constructed successfully. rCaspase3 has apoptotic activity and can be used as target gene in gene therapy for pancreatic carcinoma.
ObjectiveTo explore the value of multi-slice CT angiography (MSCTA) in peripancreatic vascular invasion of pancreatic carcinoma. MethodsThirty-eight patients with pancreatic carcinoma were detected by MSCTA technology before operation. The peripancreatic vascular invasion of pancreatic carcinoma was evaluated by multi-planar reconstruction (MPR) and maximum intensity projection (MIP) combined with axial image, and compared with the surgical results. ResultsThe MSCTA results showed that there were 12 patients (31.6%) with vascular invasion in 38 patients with pancreatic carcinoma, and the surgical results showed that there were 16 patients (42.1%) with vascular invasion. There was a b fit goodness of two results (kappa=0.665, P=0.000). The sensibility and specificity of MSCTA was 68.8% (11/16) and 95.5% (21/22), respectively. ConclusionsMSCTA technology has a high correct rate in evaluation of peripancreatic vessel encroached by pancreatic carcinoma, the MSCTA result has a b consistency to the surgical result. It has a value of clinical application in evaluation of peripancreatic vessel encroached by pancreatic carcinoma.
ObjectiveTo study the expressions of Ras trapping to Golgi (RasTG) genes in pancreatic carcinoma tissues and to observe the growth, proliferation and the impact of tumors formation of human pancreatic cancer cells (PANC-1), and to explore its mechanism. MethodsMade PANC1 as a target to research, transfected RasTG genes into PANC-1, used RNAi technology and observed the growth, proliferation and the impact of tumors formation of the cells. Meantime, contrasted the RasTG expressions between pancreatic ductal cancer and adjacent tissue by tissue microarray technology. Results①The expression of RasTG gene in tissues was not very differential， which was higher in the brain, liver, and adrenal gland. ②The expression of RasTG protein in pancreatic ductal carcinoma was significantly higher than that in adjacent tissues （Plt;0.05）. ③After RasTG RNAi in PANC-1 cells, the ability of growth and proliferation were decreased. ④The ability of tumors formation in PANC-1 cells after RNAi was decreased, carcinoma’s volume of transfected group was significantly smaller than that in the nontransfected group (Plt;0.05). ConclusionsRasTG gene is widely distributed in animals. RasTG protein in pancreatic carcinoma tissues is higher than that in adjacent tissues. The ability of proliferation, transformation and tumors formation in PANC-1 cells after RNAi of RasTG gene are restrained, RasTG gene is a positive regulatory factor.
【Abstract】Objective To search for valuable serum tumor markers in diagnosis and prognosis of pancreatic carcinoma. Methods Seven kinds of serum tumor markers including AFP,CEA,CA50, CA15-3,CA19-9,CA72-4 and CA125 were detected in 62 patients with pancreatic carcinoma by Auto DELFIA and IRMA, 16 patients with other gastrointestinal tumors and 16 patients with benign diseases served as control. And 19 patients after pancreatectomy were followed up. Results Among these 7 kinds of tumor markers, CA19-9,CA50 and CA125 were valuable in diagnosis of pancreatic carcinoma. CA19-9 was the most valuable one, whose sensitivity and specificity were 90.6% and 86.7% respectively. After resection of the tumor, the 3 markers tended to decrease significantly. Conclusion Serum CA19-9,CA50 and CA125 were valuable in diagnosis and following up of pancreatic carcinoma.
【Abstract】ObjectiveTo investigate the relationship between tumor suppressor gene DPC4 and the development and prognosis of pancreatic carcinoma. MethodsRelevant literatures of recent years were reviewed. ResultsDPC4 was located on chromosome 18. Its product was Smad 4 protein. Smad 4 protein was the central component of the transforming growth factor-beta signaling pathway, and all the biological effect was the results of interaction of Smad 4 and different Smads. The gene was deleted or inactive in about 50% of pancreatic carcinomas. The deletion of DPC4 had a great relation to the development and prognosis of pancreatic carcinoma. ConclusionThe alteration of tumor suppressor gene DPC4 is connected with the development and prognosis of pancreatic carcinoma. However, this research should be further studied.
Objective To summarize the principle and application of functional MR imaging of pancreatic carcinoma and chronic mass-forming type pancreatitis. Methods Articles about diffusion-weighted imaging (DWI), magnetic resonance spectrum imaging (MRSI) and dynamic contrast-enhanced MR imaging of pancreatic carcinoma and chronic pancreatitis were reviewed and analyzed. Results Functional MR imaging could reflected the differences in molecules diffusion, metabolism and tissue perfusion between pancreatic carcinoma and chronic pancreatitis. Conclusion As a non-invasive protocol, functional MR imaging can provide useful information in differential diagnosis between chronic mass-forming type pancreatitis and pancreatic carcinoma.
Pancreolith with pancreatic carcinoma is a rare disease. It’s difficult to be diagnosed before operation. In this study we summerized 29 cases of pancreolith (including cases of pancreolith with pancreatic carcinoma) during Jan. 1989 to Oct. 1994 treated in our hospital. The clinical characteristics were the following more male patients encomtered; many had the history of chronic alcoholic pancreatitis and many accompanied with diabetes; the main symptoms were persistent upper abdominal pain, pain in the back anoxia, diarrhea, wasting, but rarely jaundice. Main points in diagnosis: ①When the symptoms of chronic pancreatitis are getting worse and the patients become wasting, the carcinoma should be considered. ②Mutiple investigations such as B-US, CT, and MRI, CA19-9, CEA should be taken. ③Exploretory laparotomy and freezy biopsy is performed If nesscessery. Two patients were diagnosed before operation in this study. 3 cases had pancreatoduodenectomy. One had biopsy and other had pancreatojejunostomy.