BACKGROUND:To trace the survival status of transplanted stem cels and the integration with host tissues using non-invasive imaging techniques are the focus of research in recent years. OBJECTIVE:To observe the distribution and migration of superparamagnetic iron oxide (SPIO)-labeled adipose-derived stem cels in the brain of rats with cerebral infarction. METHODS:Rat models of cerebral infarction were established and randomized into SPIO-labeled group and unlabeled group. At 1 day after modeling, the rats in the two groups were given SPIO-labeled adipose-derived stem cel suspension (10 μL) and unlabeled adipose-derived stem cel suspension (10μL) into the brain, respectively. At 1, 7, 14 days after cel transplantation, neurological severity scores were measured, and MRI was used to observe the distribution of SPIO-labeled adipose-derived stem cels. RESULTS AND CONCLUSION:At 7 and 14 days after transplantation, the neurological severity scores in the two groups were significantly lower than those at 1 day after transplantation (P < 0.05). However, there was no difference in the neurological severity scores between the two groups (P > 0.05). At 14 days after transplantation, MRI findings showed low signals in the transplanted region, indicating the cels migrated from the corpus calosum to the lesion. These findings suggest that intracerebral transplantation of adipose-derived stem cels can promote neurological recovery from cerebral infarction in rats, and MRI can be used to visualize the distribution and migration of SPIO-labeled adipose-derived stem cels in the brain.

The paper describes the appearance of orbital trauma in 5 cases on magnetic resonance imaging (MRI). It helps to show subacute intraorbital hematomas not detectable with plain CT. MRI is better also than CT in the detection of traumatic arteriovenous fistula with proptosis without the use of contrast medium. But, MRI is contraindicated in the search for foreign bodies in the skull, for which CT scan is far superior.

7?cm to a dose of 48-60?Gy in 8-10 fx over 21-24 days. Patients with positive supraclavicular lymph nodes received conventional fractionated radiotherapy with 12 MeV-E to a total dose of 66-70 ?Gy in 7 weeks. Therapeutic effect and survival rate were studied. Results Twelve patients achieved CR, 22 PR, 4 NR and 5 PD, with a total response rate of 79.1%(34/43). The 1-, 2- and 3-year survival rates were 75.2%, 53.2% and 35.4%. Conclusions Three-dimensional conformal hypofractionated high-dose radiotherapy combined with chemotherapy should be considered as an effective and feasible approach in the treatment of NSCLC patients. Long-term survival and possible specific injury await further study.

There are many difficulties in studying Radiation & Oncology.We improve the teaching effect by selecting the proper teaching content,optimizing the teaching mode,cultivating idea of multidisciplinary tumor management and clinical teaching.

Objective To explore the clinical value of cervical lesion screening,which was detected by Pap smears,thinprep cytologic test (TCT),full automatic cellular DNA quantitative analysis system,human papilloma virus detection,colposcopy staining biopsy and blind biopsy.Methods 8 780 peoples were as the study object,divided into four groups,positive rate and accuracy of different screening methods;In addition,which were the positive rate of colposcopy staining biopsy and blind biopsy,the positive rate of HPV in all positive biopsy people and negative biopsy people,and the HPV infection rate of various lesions in positive patients were compared,respectivey.Results (1) The positive rates between the four groups showed an increasing trend (P ＜ 0.05).The positive rate of Pap smears and TCT had no statistical difference between every two of them (P ＜ 0.05),the rest were statistically significant (P ＜0.05).(2) The accuracy rates between the four groups showed an increasing trend (P ＜ 0.05).The accuracy rate of Pap smears and TCT had no statistical difference between two of them(P ＞ 0.05),the rest were statistically significant (P ＜ 0.05).(3)The positive rate of colposcopy biopsy under vision inspection with acetic acid (VIA) was higher than that of blind biopsy (P ＞ 0.05).(4) The positive rate of HPV detection of positive biopsy people was higher than that of negative biopsy people(P ＜0.05).(5)In colposcopy biopsy under vision inspection with acetic acid(VIA)group,the HPV positive rates of inflammation showed an increasing trend(P ＜ 0.05) ;in blind biopsy group,the HPV positive rates also showed an increasing trend (P ＜ 0.05).Conclusion (1) HPV test has the highest sensitivity and strongest specificity,cellular DNA quantitative analysis is second,Pap smears is worst,so HPV and DNA detection have more valuable in clinical.(2)There is no significant difference between colposcopy biopsy under vision inspection with acetic acid(VIA)and blind biopsy in clinical,but HPV infection is the key factor,which affects the occurrence,development of cervical intraepithelial neoplasia and gradually progresses to cervical cancer.

ObjectiveTo evaluate the effects of transcatheter arterial chemoembolization (TACE) combined with 3-dimensional conformal radiation therapy(3DCRT )for unresectable primary hepatic carcinoma (PHC). MethodsNinety-four patients with unresectable PHC were initially treated with TACE and then sequentially with 3DCRT. The therapeutic effect and survival rate of the patients were assessed as endpoints with Cox proportional hazard model used to define prognostic factors. Of these 94 patients,82 presented with a solitary lesion and 12 with multiple ones. Fifty-nine patients received only one course of TACE while 35 several courses. The total radiation dose of 42-52 Gy was delivered to 42 patients, and 53-60 Gy to 52. ResultsThe local response rates were 90.4% (85/94) in 3 months and 83.0% (78/94) in 1 year after treatment with 12 CR,73 PR,6 NR and 3 PD. The 1-,2-,and 3-year survival rates were 93.6%,53.8% and 26.0% respectively,with a median survival duration of 25.0 months. In the multivariate analysis,the number of tumor lesion,Child's classification and clinical stage presented prognostic significance for overall survival (P

Objective To investigate the risk factors of radiation-induced oral mucositis (ROM) and to provide evidence for the prevention of ROM. Methods The severity of ROM was observed and recorded in 56 patients with nasopharyngeal carcinoma. The association of the severity of mucositis with age , sex, clinical stage, concurrent chemoradiotherapy, white blood cell count,BMI index, smoking, alcohol intake, and history of diabetes were assessed by using multivariate logistic regression analysis. Results The severity of ROM was significantly associated with a decrease in leucocyte count (P<0.05), and it was not markedly correlated with the other eight factors (P>0.05). Conclusions Leukopenia was one of the risk factors for the development of ROM. In clinical pratice,leukopenia should be corrected in patients with bone marrow depression due to radiotherapy in a timely manner.

Objective To analyse the ultrastructural and metabolic changes of brain injury after single-fraction high-dose radiation in rabbits by means of proton 1-hydrogen) magnetic resonance spectroscopy ~1H MRS) ,in order to provide the basic theory for early detection of radiation-induced brain injury.Methods Experimental model of single-fraction high-dose radiation-injured brain was established in 40 rabbits , which were randomly divided into 4 groups and underwent 10, 15, 20 Gy and 30 Gy radiation , respectively. Proton MRS in a clinical MR imager was used to ascertain the amount of whole-brain N-acetylaspartic acid NAA), lactic acid Lac), choline Cho), creatine Cr) before and within 8 weeks after focused single-fraction high-dose irradiation therapy. Metabolic maps of NAA, Lac, Cho and Cr were created from MRS data set. Detection of irradiation injury among the tested models was assessed by receiver operating characteristic analysis and by quantitative signal intensity changes. The peak values of NAA , Lac , Cho and Cr on MRS before and after radiation were measured. Histopathology and electron microscope were used to ascertain changes of the ultrastructural organization in the irradiated area.the results were compared and statisti-cally analyzed. Results Initially MRS was found a slightly decrease. Until obviously change was detected, statistical significance variation of MRS occurred. A significant decrease in~1H MRS occurred at the early stage of brain injury induced by single-fraction high-dose irradiation.Conclusion ~1H MRS may be regarded as a noninvasive and sensitive means for the detection of early radiation-induced brain injury.

Objective To explore the relationship between severe(≥grade 3 ) radiation pneumonitis (RP) and dose-volume histogram (DVH) parameters for non-small cell lung cancer (NSCLC) treated with three-dimensional conformal radiation therapy (3-DCRT). Methods Ninety-four patients with NSCLC treated with 3-DCRT were retrospectively analyzed. Clinical parameters were analyzed. DVH parameters analyzed were V20, V30, V40,mean lung dose (MLD),normal tissue complication probability(NTCP) ,and total dose. Results Age,sex, Karnofsky scored, performance status, forced expiratory volume in 1 second,presence of weight loss, preexisting lung disease, history of thoracic surgery, and history of chemotherapy were not associated with the risk of severe RP(P>0.05). However,in univariate analyses, V20, V30, V40, MID and NTCP were associated with severe RP(P<0.01). In multivariate analysis, MID and V30 were variable associated with severe RP(P<0.01). The severe RP was 0 when MLD < 10 Gy and 21%(8/39) when MLD between 10 Gy and 20 Gy but 35%(7/20) when MLD > 20 Gy,it was 0 when V30 < 25% and 12%(4/33) when V30 between 25% and 35% but 38%(11/29) when V30 >35%. Conclusion MLD and V30 are significant predictive factors for severe RP and they should be limited to ≤20 Gy and ≤ 35% in order to reduce severe RP.

Objective pSUPER was used as vector to construct the siRNA targeting the gene of Rac1 to explore its inhibitive effects on Rac1 expression in hepatoma cell HepG2,and observe the proliferation of HepG2.Methods The oligonucleotide possessing 64 bases targeting the hairpin-like RNA of Rac1 gene was chemically synthesized,and inserted into the downstream of H1 promoter of linearized pSUPER vector after annealing.The vector pSUPER-Rac1-siRNA was constructed by sequencing and restrictive digestion of the recombined vector,and then transfected to hepatome cell line HepG2.pSUPER-Control-siRNA was used as a negative contro1.Western blotting was performed to monitor the Rac1 gene in plasmid-transfected cells,and the proliferation of extracorporeal cells after Rac1 expression was detected by MTT assay.Results The siRNA expression vector pSUPER-Rac1-siRNA targeting Rac1 gene was successfully constructed.The expression of Rac1 protein in HepG2 cells was down-regulated effectively by the transfection of pSUPER-Rac1-siRNA with an inhibition rate of 82%.It was revealed by MTT detection that the proliferation rate of cells declined remarkably when the expression of Rac1 protein was inhibited efficiently.Conclusions The hairpin-like RNA expression vector pSUPER-Rac1-siRNA targeting Rac1 has been constructed successfully,which may effectually and specifically down-regulate the gene expression of Rac1 in HepG2 cells.The silencing of Rac1 protein may remarkably inhibit the proliferation of hepatoma cells,implying that the Rac1 may play an important role in the in vitro growth of hepatoma cells.