Gan-Sheng Feng

Huazhong University of Science and Technology, Wuhan, Hubei, China

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Publications (29)31.93 Total impact

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    ABSTRACT: To compare the effects of transcatheter arterial chemoembolization (TACE) with transcatheter arterial embolization (TAE) on liver function, hepatic damage, and hepatic fibrogenesis in a rabbit tumor model. Thirty-nine New Zealand white rabbits implanted with VX2 tumors in the left liver lobes were randomly divided into three groups: TAE, TACE, and control group. In the TAE group (n = 15), polyvinyl alcohol particles (PVAs) were used for left hepatic artery embolization. In the TACE group (n = 15), the tumors were treated with left hepatic arterial infusions of a suspension of 10-hydroxycamptothecin and lipiodol, followed by embolization with PVAs. In the control group (n = 9), the animals received sham treatment with distilled water. Serum and liver samples were collected at 6 hours, 3 days and 7 days after treatment. Liver damage was measured using a liver function test and histological analyses. Liver fibrogenesis and hepatic stellate cell (HSC) activation were evaluated using Sirius Red and anti-alpha-smooth muscle actin (α-SMA) immunohistochemical stains. TACE caused liver injury with greater increases in serum alanine aminotransferase and aspartate aminotransferase levels on day 3 (P<0.05). Histological analyses revealed increased hepatic necrosis in adjacent non-tumorous liver tissue from day 3 compared to the TAE group (Suzuki score of 2.33±1.29 versus 1.13±1.18, P = 0.001). HSC activation and proliferation were significantly increased in the TACE group compared to the control group at 3 and 7 days after treatment (0.074±0.014 vs. 0.010±0.006, and 0.088±0.023 vs. 0.017±0.009, P<0.05). Sirius Red staining demonstrated a statistically significant increase in collagen deposition in the livers in the TACE group 7 days after embolization compared to the control group (0.118±0.012 vs. 0.060±0.017, P = 0.05). The results of this animal study revealed that TACE induced prominent hepatocellular damage and hepatic fibrogenesis, which compromised liver function and may be responsible for chronic liver decompensation.
    PLoS ONE 01/2013; 8(8):e70757. · 3.53 Impact Factor
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    ABSTRACT: ObjectiveTo evaluate the efficacy of selective transcatheter arterial embolization (TAE) in renal angiomyolipoma (AML) spontaneous ruptures with hemorrhage. MethodsA retrospective evaluation was carried out in 21 renal AML cases with acute bleeding confirmed by imaging. Selective renal arterial embolization was used to control bleeding. All the cases were detected by renal arteriography had abnormal vascular hyperplasia and enlarged blood vessels. ResultsInitial renal arteriography for all the patients showed that tortuous, hypervascular, and aneurysm-forming angiogenic components with aneurysm formation occurred in 13 cases (61.9%) and extravasation of the contrast agent was found in 8 cases (38.1%). Immediate complete obliteration was technically successful in 19 (90.5%) of the 21 patients. To prevent uncontrollable complications, 3 patients received nephron-sparing surgery after hemodynamic status was stabilized with TAE a week later. Two days and 3 days after the embolizations, 2 patients presented with incomplete embolizations and then underwent nephrectomy when they were in a stable condition. There were no significant differences in the plasma creatinine levels before and after the treatment. All the patients were followed up for 6 months to 6 years (median, 45 months). The largest tumor diameter was reduced from (11.57±4.28) cm to (9.57±2.28) cm. The tumor had no blood supply and no relapses have occurred. ConclusionTAE is a technically feasible and minimally invasive procedure for ruptured renal angiomyolipoma. The aneurysms were a predictor of renal AML spontaneous rupture and detection of such aneurysms by CT may help to determine the timing of embolization. In patients who still need surgical treatment, TAE can make tumor resection easier to perform and reduce blood loss during the operation. Key Wordsrenal angiomyolipoma–hemorrhage–artery embolization–therapy
    Clinical Oncology and Cancer Research 01/2011; 8(3):163-169.
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    ABSTRACT: To evaluate the efficacy of recombinant human adenovirus p53 gene therapy (rAd-p53) in the rabbit VX2 liver cancer model using different interventional therapy approach. Thirty New Zealand rabbits implanted with VX2 tumor in the liver were randomized into five groups with six of each. The tumor volumes (V1) were measured by MRI and CT scan 11 days after tumors implanted. The interventional therapy scheme performed as below: intraarterial 0.9% saline solution perfusion in group A, transcatheter arterial embolization with 0.5 ml ultrafluid lipiodol in group B, intraarterial rAd-p53 gene perfusion in group C (1 x 10(6)/VP); intraarterial rAd-p53 gene perfusion (1 x 10(6)/VP) in combination with transcatheter arterial embolization (ultrofluid lipiodol, 0.5 ml) in group D and intratumoral rAd-p53 gene (1 x 10(6)/VP) injection in group E. The tumor volumes (V2) were measured by MRI and CT scan, and the tumor growth ratios were calculated 14 days after interventional procedures. Then all animals were sacrificed. The tumor tissues were explanted for immunohistochemistry to observe the expressions of vascular endothelial cell growth factor (VEGF) and factor VIII. Microvessel density (MVD) of the tumor tissues was assessed by factor VIII immunohistochemical analysis. In addition, apoptotic index was assessed by terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) staining. The tumor volumes before therapy were (79.4+/-8.2), (75.3+/-7.8), (74.6+/-6.6), (78.7+/-9.1), (75.8+/-8.4) mm(3) respectively, without differences found among them (F = 12.248, P = 0.0636). But the tumor volumes after therapy were (564.7+/-96.7), (176.5+/-83.2), (239.6+/-42.8), (159.8+/-58.6), (334.7+/-32.6) mm(3) respectively (F = 24.537, P = 0.0218). The tumor growth ratios were 6.9, 2.6, 3.1, 1.6 and 4.1 respectively. The mean apoptosis index were 12.0%+/-1.1%, 14.5%+/-2.1%, 17.6%+/-2.3%, 18.6%+/-2.3% and 19.6%+/-2.5% respectively. with significant differences in group E in comparison with the other four groups. Mean positive ratio of VEGF was 50.0%, 83.3%, 83.3%, 50.0% and 50.0% respectively, with significant differences observed in group B and group C compared with the other three groups (F = 7.84, P = 0.019). The differences of VIII factor positive expression ratio among each group were significant (F = 0.854, P = 0.018). Statistical analysis showed a positive correlation between the expression of VEGF and MVD (r = 2.400, P = 0.0233). The rAd-p53 has effective treatment outcomes in VX2 rabbit liver cancer, and intra-arterial rAd-p53 gene perfusion in combination with transcatheter arterial embolization is the best approach in comparison with intra-arterial rAd-p53 gene perfusion, transcatheter arterial embolization and intratumoral rAd-p53 gene injection alone.
    Zhonghua gan zang bing za zhi = Zhonghua ganzangbing zazhi = Chinese journal of hepatology 07/2010; 18(7):502-5.
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    ABSTRACT: To summarize and compare the short-term and long-term clinical efficacy of percutaneous transhepatic biliary drainage (PTBD) and percutaneous transhepatic biliary stent (PTBS) in the treatment of malignant obstructive jaundice. 210 cases of malignant obstructive jaundice underwent interventional therapy, of which 161 cases of drainage catheters placement and 49 cases of metallic stent implantation. Follow-up information was obtained through telephone review or check-up records. The technical success rate of technique was 100%. At 3 - 5 days after treatment, the serum total bilirubin in 15 metallic stent-treated patients was decreased by (178.04 +/- 42.32) micromol/L, and direct bilirubin by (83.97 +/- 23.63) micromol/L. Compared with those of 28 cases treated with drainage catheters: (95.67 +/- 34.28) micromol/L and (49.84 +/- 28.21) micromol/L, there were statistically significant differences between the two groups (P = 0.017 and P = 0.035). At 6 - 9 days after treatment, the serum total bilirubin in 28 cases of metallic stent group was decreased by (188.22 +/- 79.90) micromol/L, and that in 126 cases of drainage catheter group decreased by (141.39 +/- 65.32) micromol/L. The difference was statistically significant (P = 0.014). But the decline value of direct bilirubin had no significant difference. The median patency period and the median survival time of the drainage catheter group were 60 and 148 days, respectively, those of metallic stent group were 197 days and 245 days. There were statistically significant differences between the two groups (P < 0.05). The results of this study indicate that the short-term and long-term efficacies of metallic stent implantation are better than those of catheter drainage technique.
    Zhonghua zhong liu za zhi [Chinese journal of oncology] 06/2010; 32(6):456-8.
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    ABSTRACT: This study sought to determine the expression of hypoxia-inducible factor 1alpha (HIF-1alpha) and its relation to angiogenesis in liver tumors after transcatheter arterial embolization (TAE) in an animal model. A total of 20 New Zealand White rabbits were implanted with VX2 tumor in liver. TAE-treated group animals (n = 10) received TAE with polyvinyl alcohol particles. Control group animals (n = 10) received sham embolization with distilled water. Six hours or 3 days after TAE, animals were humanely killed, and tumor samples were collected. Immunohistochemical staining was performed to evaluate HIF-1alpha and vascular endothelial growth factor (VEGF) protein expression and microvessel density (MVD). Real-time polymerase chain reaction was performed to examine VEGF mRNA levels. The levels of HIF-1alpha protein were significantly higher in TAE-treated tumors than those in the control tumors (P = 0.001). HIF-1alpha protein was expressed in viable tumor cells that were located predominantly at the periphery of necrotic tumor regions. The levels of VEGF protein and mRNA, and mean MVD were significantly increased in TAE-treated tumors compared with the control tumors (P = 0.001, 0.000, and 0.001, respectively). HIF-1alpha protein level was significantly correlated with VEGF mRNA (r = 0.612, P = 0.004) and protein (r = 0.554, P = 0.011), and MVD (r = 0.683, P = 0.001). We conclude that HIF-1alpha is overexpressed in VX2 tumors treated with TAE as a result of intratumoral hypoxia generated by the procedure and involved in activation of the TAE-associated tumor angiogenesis. HIF-1alpha might represent a promising therapeutic target for antiangiogenesis in combination with TAE against liver tumors.
    CardioVascular and Interventional Radiology 11/2009; 33(4):806-12. · 2.09 Impact Factor
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    ABSTRACT: To establish stable enhanced green fluorescent protein (GFP) -expressing human adenoid cystic carcinoma (ACC-M-GFP) cell lines with high lung metastatic potential, and to study the value and influential factor of in vivo monitoring of metastasis and angiogenesis by fluorescent imaging. Human adenoid cystic carcinoma cell line ACC-M-GFP labeled with enhanced GFP was established. ACC-M-GFP cells of the dose 10(7)/ml were injected subcutaneously into two nude mice. Once the subcutaneous tumor reached 0.5 cm in diameter, it was removed, cut into 1 mm3 pieces, and implanted into the left hepatic lobe of 8 nude mice. The animals were observed by whole-body optical imaging system and stereofluorescent microscope each two weeks from the fourth week after transplantation. One mouse was killed and autopsied after each examination. The livers, lungs, and adjacent organs, such as diaphragm and lymph nodes were excised, and fluorescent imaging of different organs separately was studied. Hepatoma was cryostat sectioned and angiogenesis was visualized under fluorescence microscope. The findings of fluorescent imaging were compared with those of HE staining on routine paraffin sections. Liver tumors were transplanted successfully in all 8 nude mice. By whole-body optical system, the fluorescent signal from the liver tumor was detected through a skin-flap window after 6 - 8 weeks. Tumors were visualized directly through skin after 8 - 10 weeks. The hepatoma became enormous after 12 - 14 weeks, when the fluorescent signal of abdominal metastasis was detected. Metastasis of lung and lymph node was found by single organ imaging after 16 -18 weeks. By stereofluorescent microscope, microvessels were detected after 4 weeks, and a large quantity of tumor vessels like black branch stripes were found after 12 - 14 weeks. The tumor vessels appeared as dark tubiform network against the green fluorescence of the implanted tumor in section. Fluorescent imaging provides a method to monitor tumor growing, infiltrating, metastasis and angiogenesis in real time in vivo.
    Zhonghua yi xue za zhi 01/2008; 87(46):3307-9.
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    ABSTRACT: The purpose of this study is to evaluate the usefulness of multislice spiral computed tomography (CT) in the diagnosis of congenital inner ear malformations. Forty-four patients with sensorineural hearing loss were examined on a Somatom Sensation 16 (Siemens) CT scanner. The 3-dimensional reconstructions and multiplanar reformation (MPR) were performed using the volume-rendering technique (VRT) on the workstation. Of the 44 patients examined for this study, 25 patients were found to be normal and 19 patients (36 ears) were diagnosed with congenital inner ear malformations. Of the malformations, the axial, MPR, and VRT images can all display the site and degree in 33 of the ears. Volume-rendering technique images were superior to the axial images in displaying the malformations in 3 ears with small lateral semicircular canal malformations. The common malformations were Michel deformity (1 ear), common cavity deformity (3 ears), incomplete partition I (3 ears), incomplete partition II (Mondini deformity) (5 ears), vestibular and semicircular canal malformations (14 ears), enlarged vestibular aqueduct (16 ears, 6 of which had other malformations), and internal auditory canal malformation (8 ears, all accompanied by other malformations). Multislice spiral CT allows a comprehensively assessment of various congenital inner ear malformations through high-quality MPR and VRT reconstructions. Volume-rendering technique images can display the site and degree of the malformation 3-dimensionally and intuitionisticly. This is very useful to the cochlear implantation.
    Journal of Computer Assisted Tomography 01/2008; 32(1):146-50. · 1.58 Impact Factor
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    ABSTRACT: PURPOSE To investigate the feasibility of volume rendering technique(VRT) in the assessment of postoperative cochlear implant patients and to assess the position of the electrode arrays within the cochlea. METHOD AND MATERIALS 23 children of Combi 40 cochlear implant recipients were included in this study. All the recipients were examined with a MSCT scanner (SOMATOM Sensation 16, Siemens) 7 days after the surgery. Axial imaging were performed using the following parameters:120kv,100mAs,0.75mm slice thickness,a pitch factor of 1.The axial images of implanted ears were reconstructed with 0.1mm reconstruction increment and a FOV of 50mm.Then,3D reconstructions of bony labyrinth and electrode arrays were done with volume rendering technique on the workstation by using the double threshold and false color. RESULTS The time required for volume rendering and electrode assessment ranged from 10 to 20 minutes.By using the double threshold and false color,both the electrode arrays and the bony labyrinth were isolated and displayed in the same 3-D model. It provided an intuitionistic and three-dimensional view of the relationship of electrode array and the cochlea.In 20 children VRT images showed 12 pair electrodes within the cochlea,in one child VRT showed 11 pair electrodes and in two children VRT showed 10 pair electrodes. CONCLUSION Visualization of both the electrode and cochlea in one 3-D model with VRT is feasible. It provided an intuitionistic and three-dimensional view of the relationship of electrode array and the cochlea and is the unique method to assess electrode position within the cochlea. CLINICAL RELEVANCE/APPLICATION VRT enables visualization of both the individual electrode and anatomic details of the cochlea,thus providing useful information to optimize the function of the cochlear implant in individual patients
    Radiological Society of North America 2007 Scientific Assembly and Annual Meeting; 11/2007
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    Zhonghua gan zang bing za zhi = Zhonghua ganzangbing zazhi = Chinese journal of hepatology 05/2006; 14(4):295-6.
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    ABSTRACT: To evaluate the value of X-ray and spiral computed tomography (SCT) in the diagnosis of Swyer-James syndrome (SJS). A total of 28 patients, 12 males and 16 females, were studied retrospectively. Ages ranged from 11 to 57 years, the mean age was 32 years. All patients underwent inspiratory chest X-ray films, 5 with expiratory chest films and 1 with bronchogram. Furthermore, inspiratory and expiratory SCT scans were performed. The SCT findings were analyzed and compared with X-ray films. SCT demonstrated 56 lobes with hyperlucency and diminished vascularity. The size of 51 lobes were smaller and 5 were normal. X-ray films showed that hyperlucency was only in 29 lobes, in which 19 lobes were small-sized and the other 10 lobes normal. There were 56 lobes with air-trapping on expiratory SCT scans, but only 5 lobes with air-trapping on expiratory X-ray films. Bronchogram in 1 case demonstrated bronchiectasis and bronchiolitis obliterans. SCT showed 24 patients with bronchiectasis, 9 patients with tuberculosis, 10 patients with bronchiolitis, and 2 with segmental collapse. SCT scan is superior to chest radiography in the diagnosis and differential diagnosis of SJS.
    Chinese Medical Sciences Journal 04/2006; 21(1):53-6.
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    ABSTRACT: To evaluate the usefulness of multi-slice spiral CT (MSCT) in the post-operative assessment of cochlear implanted electrode. Twenty-three cochlear implant recipients were enrolled in this study. All patients were examined with a SOMATOM Sensation 16-slice CT scanner (Siemens) using the following parameters: 120 kV, 100 mAs, 0. 75 mm collimation, 1 mm reconstruction slice thickness and increment, a pitch factor of 1, and a FOV of 100 mm. The axial images of interested ears were reconstructed with 0.1 mm increment and a FOV of 50 mm, and then volume rendering technique (VRT) reconstruction were done on the work station. The electrode arrays were detected on axial CT images. Both inner ear and electrode array could be displayed on one image simultaneously. VRT provided an intuitionistic view of the relationship between electrode array and cochlea VRT showed the number of the electrode array in 20 patients implanted with Combi 40 + standard electrode array and demonstrated the shape, position, and insertion depth. The electrode array number determined by VRT was in accordance with the surgical findings in 18 patients, and was underestimated in two patients. In 3 patients with Combi 40 + compressed electrode array, only 4 to 5 electrodes arrays were clearly identified and others were not observed. MSCT with VRT can provide useful three-dimensional information of the electrode array and indicate the exact relationship between electrode array and cochlea.
    Zhongguo yi xue ke xue yuan xue bao. Acta Academiae Medicinae Sinicae 03/2006; 28(1):13-5.
  • Yang-yang Zhou, Ping Han, Gan-sheng Feng, Bo Liang
    Chinese medical journal 09/2005; 118(16):1400-1. · 0.90 Impact Factor
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    ABSTRACT: At present, the therapy for patients with lung cancer that achieves a high rate of cure is surgical resection at an early stage of the disease. The aim of this study is to evaluate quantitative computed tomography (QCT) for predicting postoperative pulmonary function in patients with lung cancer. The data of thirty-one patients with lung cancer who underwent both pulmonary functional tests and QCT scan before operations were collected. A CT program was used to quantify the volume of whole lung parenchyma with attenuation of -910 HU to -600 HU, which was defined as total functional lung volume (TFLV). Similarly, the volume of lung (lobes or segments) with attenuation of -910 HU to -600 HU was defined as regional functional lung volume (RFLV). Forced vital capacity (FVC), forced expiratory volume in first second (FEV1), FVC% and FEV1% (ratio to reference values of the matched population) were obtained from preoperational pulmonary functional tests. According to the formula: predicted FVC (pre-FVC) = preoperative FVC x [1-(RFLV/TFLV)]; predicted FEV1 (pre-FEV1) = preoperative FEV1 x [1-(RFLV/TFLV)], we obtained values of predicted FVC, predicted FEV1, predicted FVC% (pre-FVC/reference values of the matched population), and predicted FEV1% (pre-FEV1/reference values of the matched population). The paired t test and Pearson correlation test were used to assess significance of differences and correlations between CT predicted values and postoperative measured results of FVC, FEV1, FVC% and FEV1%. QCT predicted values correlated well with postoperative FVC, FEV1, FVC% and FEV1% (r = 0.873, 0.809, 0.849 and 0.801 respectively, all P < 0.01). QCT is an effective and accurate way to predict postoperative pulmonary function in patients undergoing pulmonary resection, regardless of the patients' preoperative pulmonary functional status.
    Chinese medical journal 05/2005; 118(9):742-6. · 0.90 Impact Factor
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    Han-Ping Wu, Gan-Sheng Feng, Yuan Tian
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    ABSTRACT: To study the distribution and stability of antisense oligodeoxynucleotide (ASODN) in Walker-256 cells and their distribution in liver, lung and kidney tissues after being infused alone or mixed with lipiodol via hepatic artery in a rat liver tumor model. 5'-Isothiocyanate (FITC)-labeled vascular endothelial growth factor (VEGF) ASODN was added into Walker-256 cell culture media. Its distribution in cells was observed by fluorescence microscope at different time points. Walker-256 carcinosarcoma was transplanted into Wistar rat liver to establish a liver cancer model. 5'-FITC-labeled VEGF ASODN mixed with (mixed group, n = 6) or without (TAI group, n = 6) ultra-fluid lipiodol was administrated via hepatic artery. Frozen samples of liver, lung and kidney tissue were taken from rats after 1, 3 and 6 d, respectively. The distribution of ASODN was observed under fluorescent microscope. ASODN could enter cytoplasm within 2 h and nuclei within 6 h. Accumulation of ASODN reached the peak point in nuclei at 12 h, and then disappeared gradually. No fluorescence could be seen in cells at 48 h. In vivo experiment, on d 1 and 3 the fluorescence staining in liver was stronger in mixed group than in TAI group and more fluorescence could be detected in lung and kidney in TAI group than in mixed group. On d 6, no fluorescence could be detected in TAI group, but faint fluorescence could be seen in mixed group. ASODN could be seen in cancer cells and normal hepatic cells. In mixed group, ASODN was mainly distributed in liver tumor tissues. ASODN can transfect Walker-256 cells. ASODN mixed with lipiodol infusion via hepatic artery can be used in the treatment of HCC.
    World Journal of Gastroenterology 05/2005; 11(16):2408-12. · 2.55 Impact Factor
  • Zhonghua gan zang bing za zhi = Zhonghua ganzangbing zazhi = Chinese journal of hepatology 03/2005; 13(2):143-4.
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    ABSTRACT: PURPOSE To evaluate the ability of the volume rendering technique to display the normal and abnormal inner ear structures. METHOD AND MATERIALS 40 normal ear (20 volunteers) and 45 abnormal inner ears (24 congenital inner ear malformations,7 labyrinthitis ossificans, and 14 inner ear erosion caused by cholesteatomas) were examined with a MSCT scanner (SOMATOM Sensation 16, Siemens). Axial imaging were performed using the following parameters:120kv,100mAs,0.75mm slice thickness,a pitch factor of 1.The axial images of interested ears were reconstructed with 0.1mm reconstruction increment and a FOV of 50mm.The 3D reconstructions were done with volume rendering technique on the workstation (3D Virtuoso, Siemens). RESULTS In the subjects without ear disorders a high quality 3D visualization of the inner ear could be achieved.In the patients with ear disorders all inner ear malformations could be clearly displayed on 3D images. For the eight ears with the lateral semicircular canal malformations volume rendering images were superior to the axial images in displaying the malformations.And in describing the other 16 inner ear malformations including Michel(1 ear),Mondini (3 ears),and large vestibular aqueduct syndrome(12 ears) volume rendering was comparable with the axial images.In 7 patients with labyrinthitis ossificans 3D images failed to clearly show the abnormalities in 4 ears(57.1%) because of too high ossifications in the membranous labyrinth, though it could provide useful diagnostic information.In the other 3 ears (42.9%) volume rendering can display the thin cochlea basal turn and the intermittent semicircular canals.In the patients with cholesteatomas 3D volume rendering images could identify the site of the bony labyrinth erosion and its surrounding structures. CONCLUSIONS Volume rendering technique can provide higher quality three-dimensional images of the bony labyrinth and serves as a useful tool for analysis of anomalies of the inner ear.
    Radiological Society of North America 2004 Scientific Assembly and Annual Meeting; 11/2004
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    ABSTRACT: PURPOSE To evaluate the usefulness of multi-slice spiral computed tomography(MSCT) in diagnosing congenital ear malformations. METHOD AND MATERIALS 69 ears with congenital middle or/and inner ear malformation in 48 children were examined with MSCT.The axial imaging were performed on a SOMATOM Sensation 16 CT scanner (Siemens,Germany) using the following parameters:120kv,100mAs,0.75mm collimation,1mm reconstruction increment, a pitch factor of 1 and a FOV of 100mm.The axial images of interested ears were reconstructed with 0.1mm reconstruction increment and a FOV of 50mm and then 2D and 3D reconstruction were done on the workstation (3D Virtuoso). RESULTS There were 24 ears with inner ear malformations(IEM),43 ears with external auditory canal malformations (EACM) and middle ear malformations(MEM), two ears with EACM and MEM and IEM. Of which, external auditory canal atresia combined with middle ear malformations was the most frequent abnormality.Of the 45 MEM ossicle dysplasias,closed oval window and facial nerve canal displacement were found in 44 (97.7% ),two (4.4%) and 31 (68.9%) ears,respectively. In the cases of 24 IEM,there were 12 large vestibular aqueduct syndrome (50%) and 8 vestibular and semicircular canal malformations (33.3%).There were three ears with Mondini malformation and one ear with Michel malformation.All the ear malformations could be visualized by 2D and 3D images in excellent detail without supplementary scans. Of 45 EACM and MEM volume rendering could clearly show the three dimensional external auditory canal atresia and ossicle dysplasias clearly.Virtual endoscopy images were not satisfied in 20 ears due to the narrow middle ear cavity. Closed oval window was more easily diagnosed on the MPR coronal images than on the axial images.In the patients with inner ear malformations all the axial,and MPR and 3D images could distinctly display the malformed site and degree. CONCLUSION The imaging of the temporal bone using MSCT allows a comprehensively assessing various congenital ear malformations through high quality 2D and 3D reconstructions.
    Radiological Society of North America 2004 Scientific Assembly and Annual Meeting; 11/2004
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    ABSTRACT: To investigate the expression level of plasma vascular endothelial growth factor (P-VEGF) in patients with hepatocellular carcinoma (HCC) and its relationship with the clinicopathologic characteristics, and to examine the changes of P-VEGF in the course of transcatheter arterial chemoembolization (TACE). Peripheral blood samples were taken from 45 HCC patients before and 1, 3, 7 d, and 1 mo after TACE. Plasma VEGF level was measured with the quantitative sandwich enzyme-linked immunosorbent assay (ELISA). Twenty patients with benign liver lesions and 17 healthy control subjects were also included in this study. Plasma VEGF levels in HCC patients were significantly elevated as compared to those in patients with benign liver lesions (P = 0.006) and in the normal controls (P = 0.003). Significant differences were observed when P-VEGF was categorized by tumor size (P = 0.006), portal vein thrombosis (P = 0.011), distant metastasis (P = 0.017), arterial-portal vein shunting (P = 0.026), and International Union Against Cancer (UICC) TNM stage (P = 0.044). There was no correlation between plasma level of VEGF and the level of alpha fetoprotein (alpha-FP) (r = 0.068, P = 0.658) and weakly correlated with the number of platelets (r = 0.312, P = 0.038). P-VEGF levels increased significantly and reached the peak value on the first day after TACE, and then decreased gradually. The change rate of P-VEGF concentration (one month post-TACE/pre-TACEX100%) was correlated with the retention rate of lipiodol oil (r s = 0.494, P = 0.001) and the tumor volume change (r s = 0.340, P = 0.034). The patients who achieved a partial or complete response to TACE therapy showed significantly less pre-treatment P-VEGF than those nonresponders (P = 0.025). A high pre-therapeutic P-VEGF level was associated with poor response to treatment (P = 0.018). A high pre-treatment P-VEGF level is a useful marker for tumor progression, especially for vascular invasion. TACE increases the level of P-VEGF only temporarily which may be associated with tumor ischemia. P-VEGF may be useful in predicting treatment response, monitoring disease course after TACE and judging the effect of different TACE regimens.
    World Journal of Gastroenterology 11/2004; 10(19):2878-82. · 2.55 Impact Factor
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    ABSTRACT: To observe the change of tumor microcirculation after transcatheter arterial chemoembolization (TACE) with bletilla microspheres by using first pass perfusion MR imaging (FP) and Chinese ink casting. VX2 carcinoma cells were surgically implanted into the left and right lobes of liver of 30 New Zealand white rabbits, which were divided into 3 groups at random. Emulsion of lipiodol mixed with mitomycin C, and 5-FU bletilla microspheres were injected into the hepatic artery respectively, and saline was used as control agent. MR imaging was performed with turbo-flash sequence 14 d after tumor implantation and 7 d after interventional therapy. The steepest slopes (SS) of the signal intensity versus time curves were created for quantitative analysis, 7.5% Chinese ink gelatin solution was injected through ascending artery (17 cases) or portal vein (2 cases) for lesion microvessel area (MVA) measurement after the last MRI examination. The correlation between perfusion imaging and MVA was studied blindly. The SS values at the rim of tumor in lipiodol group (mean, 49% per second) and bletilla group (mean, 35% per second) were significantly decreased (P<0.05) as compared with control group (mean, 124% per second), no difference was found between lipiodol and bletilla groups (P>0.05). In lipiodol group, the MVAs (24 974+/-11 836 microm(2)) in the center of the tumor were significantly smaller than those of the control group (35 510+/-15 675 microm(2)) (P<0.05), while the MVAs (80 031+/-22 745 microm(2)) around the tumor were significantly increased because small and dense plexuses appeared around the tumor which correlated to intense reaction of granulation tissue. None of the vessels was seen in the tumor in bletilla group, the peripheral MVAs of the tumor were significantly smaller than those of the control group (P<0.05) and lipiodol group (P<0.05). There was a good correlation between SS and MVAs in control group (r(s), 0.985, P<0.0001) and bletilla group (r(s), 0.743, P<0.05), the correlation was not significant in lipiodol group (r(s), 0.527, P>0.05). TACE with bletilla microspheres may enhance its anti-tumor effect by inhibiting the angiogenesis, and FP-MRI provides useful information to assess the TACE effect by depicting tumor vascularization and perfusion.
    World Journal of Gastroenterology 06/2004; 10(10):1415-20. · 2.55 Impact Factor
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    ABSTRACT: To assess the vascularity of hepatocellular carcinoma (HCC) before and after transcatheter arterial chemoembolization (TACE) with the quantitative parameters obtained by first pass perfusion weighted MR imaging (FP-MRI). Seventeen consecutive patients with one to three lesions in liver underwent FP-MRI before treatment. FP-MRI was also performed one, three, six, nine months, and one year after TACE. The baseline signal intensity (S0) of pre-TACE and one month after TACE was analyzed, the vascularity of HCC assessed by steepest slope of the signal intensity versus time curves (SS) was blindly correlated with their DSA feature and clinical outcome. No significant difference was found on baseline signal intensity (S0) between pre-TACE and one month after TACE (F=0.309, P=0.583), The SS (mean, 32% per second) of lesion one month after TACE was lower than that of pre-TACE (mean, 69% per second), but with no statistical significance (F=3.067, P=0.092). When local recurrence occurred, the time intensity curves became steeper. The vascularity of HCC before and after TACE graded by SS closely correlated with that by DSA (K=0.453, P<0.05). FP-MRI is a useful criterion for selecting effective interventional treatment for patients with HCC in their initial treatment and during follow up.
    World Journal of Gastroenterology 04/2004; 10(8):1152-6. · 2.55 Impact Factor