Résumé
Attenuated Salmonella typhimurium VNP20009 is a widely used natural oncolytic bacterium, which has great application potential given its unique characteristics, including clinical safety, tumor targeting specificity, and explicit genome sequence. Here, we show that tumor progression can be effectively reduced by intraperitoneal administration with VNP20009 in a mouse model of melanoma (all animal experiments were conducted in accordance with the Animal Ethics Committee of China Pharmaceutical University); co-culture experiment in vitro demonstrated that VNP20009 can induce the polarization of macrophage M1, accompanied by expression of inflammation-related factors; flow cytometry analysis showed that VNP20009 induced the increase of immune cell infiltration in tumor. Further analysis showed that T cells infiltration in tumor-draining lymph node (TDLN) increased, and VNP20009 induced the activation of CD4+ T cells and CD8+ T cells in tumor. Our results demonstrate that VNP20009 treatment significantly inhibited melanoma tumors by remodeling tumor-associated macrophages to an M1-like phenotype, as well as recruiting and activating cytotoxic T cells, combined with its own antigenic activity to exert anti-tumor immunity.
Résumé
The development of CT and the clinical application of CT pulmonary angiography (CTPA) in diagnosing pulmonary embolism were introduced,and the methods for decreasing CTPA radiation dose and the importance of iterative reconstruction for low-dose scanning were analyzed.The development and application of contrast agent were described,and the ways to reduce contrast agent dose was expounded.Double-low CTPA combined with iterative reconstruction was pointed out to decrease greatly the radiation dose and contrast agent iodine dose while ensured image quality,and thus the damages to the patient by radiation and contrast agent could be lowered at the most.
Résumé
<p><b>OBJECTIVE</b>To evaluate the diagnostic value of multislice spiral CT (MSCT) pneumocolon and image reconstruction in colorectal carcinomas.</p><p><b>METHODS</b>206 patients with suspected colorectal cancer underwent whole abdominal fast volume scan using 16-slice spiral CT before they were insufflated with 1000-1500 ml air through the anus. Then the axis data were transferred to workstation for imaging by MPR, SSD, Raysum, MIP and CTVE, respectively. The results of MSCT diagnosis were compared with those of surgical pathology and from some other common adjunctive techniques, such as ultrasonography (US), colonoscopy (CC), and etc.</p><p><b>RESULTS</b>In this group, 192 cases were confirmed to be colorectal cancer by surgical pathology. 189 cases were identified by MSCT. The sensitivity, specificity and accuracy was 98.4%, 92.8% and 98.1%, respectively. The accuracy rate of general tumor classification was 98.4%. These data were compared with those by US and CC, Statistical analysis showed that the qualitative diagnosis of MSCT is more accurate than those of other two examination methods, indicating that it is most valuable clinical detection approach at present.</p><p><b>CONCLUSION</b>MSCT pneumocolon is a superior detecting method as it is safe, quick and accurate. Due to the accuracy in orienting and qualitative diagnosis by comprehensive application of 2D and 3D imaging techniques, it can clearly display the detailed information of tumor in terms of morphological characteristics, blood-supply resources and pericolonic lymph nodes involvement, which provides reliable basis for making rational surgical protocol.</p>