626 adolescent patients undergoing orthodontic treatment were divided into 4 groups according to the oral health score and ap-pointment score.(1)The score in highly educated two-parent family is higher than that in highly educated single-parent family,and the score of oral hygiene in highly educated family is higher than that in lowly educated family(P <0.05).(2)There is no statistical difference between two-parent family and single-parent family in oral hygiene when they have equal educational background.

Tumor angiogenesis is a complicated pathologic process, which plays an important role in the growth and metastasis of most solid tumors. Targeting at the angiogenesis and inhibiting tumor growth or metastasis, specific antibodies or inhibitors of tumor angiogenesis have been developed for this purpose. We summarized recent researches about the mechanism of tumor angiogenesis and the development of tumor angiogenesis inhibitors in this review.

We isolated polyA~+ mRNA direcdy from tumor tissue of ovarian carcinoma using Oligotex~(TM) Direct mRNA Kit (QIAGEN) to synthesize the first and second strand cDNA. The ds-cDNA termini were blunted with pfu DNA poly-rnerase. The blunted cDNAs were added EcoR I adaptor, and then were digested by Xho I . Small cDNA molecules(

Objective To investigate introvoxel incoherent motion (IVIM) sequence features of cervical cancer and to analyze the difference between cervical cancer and normal cervix by using biexponential model parameters of IVIM sequence.Methods MR imaging data of 26 patients with cervical cancer confirmed by surgical pathology and 26 patients of normal cervical confirmed by clinical or MR examination were analyzed retrospectively.All patients underwent routine pelvic MRI sequences,including T1WI,T2WI,DWI (b =800 s/mm2) and IVIM sequence.The IVIM sequence was applied using a biexponential model with factors from 0 to 1200 s/mm2.The standard ADC,slow ADC,fast ADC and fraction of fast ADC values of cervical cancer and normal cervix groups were measured and analyzed by using t test.Diagnostic efficacy of these parameters in cervical cancer group was evaluated by using area under the curve.Results The standard ADC,slow ADC,fast ADC and fraction of fast ADC of cervical cancer group were (0.47 ± 0.09) × 10-3 mm2/s,(0.45 ± 0.09) × 10-3 mm2/s,(5.00 ± 1.68) × 10-3 mm2/s,0.30 ±0.06 and those of normal cervical group were (0.77 ± 0.15) × 10-3 mm2/s (0.61 ± 0.06) × 10-3 mm2/s,(4.29 ±0.57) × 10-3 mm2/s and 0.44 ± 0.04,respectively.The differences of standard ADC,slow ADC value and fraction of fast ADC value between two groups were statistically significant (t =8.841,7.540,10.591,P ＜0.01,respectively).There was no difference of fast ADC between the two groups (t =0.120,P ＞ 0.05).The area under the curve of fraction of fast ADC was the maximum,and it may be the most valuable parameter for the diagnosis of cervical cancer.Conclusions Cervical cancer group has characters on IVIM with lower standard ADC,slow ADC and fraction of fast ADC compared with the normal cervix group.IVIM sequence can reflect diffusion and perfusion of cervical cancer quantitatively.It may play a complementary role in the diagnosis and has some application prospects.

Objective To synthetically evaluate the risk factors of recurrent cerebral infarction in Chinese population.Methods The research literature on the risk factors of recurrent cerebral infarction from the domestic December 2011 published was collected through computers literature retrieval (China Academic Journal,VIP Chinese Science and Technology Academic Journal,Wanfang Database) and literature review.Meta-analysis method was used to synthetically and quantitatively analyze the risk factors of recurrent cerebral infarction reported in China.All of the data were analyzed by STATA 11.0 software.Results The total research literature was 216 studies,and 12 studies were enrolled in this study according to the inclusion and exclusion criteria.All case-control study.There were 1599 cases in case group,2566 cases in control group cumulatively.Meta analysis showed that the summary statistics of sex,hypertension,diabetes,hyperlipemia,smoking,age were 1.58 (1.04-2.39),2.66 (2.02-3.51),2.23 (1.70-2.93),2.22(1.48-3.32),1.94 (1.64-2.29),1.58 (0.55-2.60),respectively.There were significances in statistics (Z =2.16,6.95,5.82,3.87,7.68,3.02,respectively,P ＜ 0.05).Conclusion Hypertension,diabetes,hyperlipemia,smoking,male and age are all the risk factors of recurrent cerebral infarction.

Objective To evaluate the safety and efficacy of treating bifurcation lessions with jailed-balloon technique in simple strategy. Methods Ninety patients with bifurcation lessions (Duke D or F type) who received the side branch protection technique with simple strategy were involved in a single center retrospective analysis. Patients were randomly divided into jailed-balloon protection group (n=48) and jailed guidewire group (n=42). The process operating, procedural success of percutaneous coronary intervention (PCI) and percutaneous transluminal coronary angioplasty (PTCA), complications and the results of follow-up were investigated. Results The clinical baseline date and the bifurcation lesions were not significant different between jailed-balloon group and jailed guidewire group (P>0.05). The procedural success rate of PCI was 100%in jailed-balloon group and 97.6%in jailed guidewire group, no significance difference user between two groups (P>0.05). The perioperative complications (the rate of no reflow) was lower in jailed-balloon group than those of jailed guidewire group (1.0%vs. 19.0%, P<0.05). The procedural success rate of PTCA were lower in jailed-balloon group than that of jailed guidewire group (4.2%vs. 23.8%, P<0.01). The total operation time [(56.40±11.71) s vs. (72.60±10.62) s],exposing time [(9.86±1.82) s vs.(12.24±2.32)s] or amount of used contrast agent [(90.54±15.26) mL vs. (118.16±18.64) mL] were significantly lower in jailed-balloon group compared with those of jailed guidewire group (P<0.05). At the 12-month follow-up, the MACE was lower in the jailed-balloon group than that of jailed guidewire group (16.7%vs. 38.1%, P<0.05). The restenotic rate (2.1%vs. 4.8%, P>0.05) and the maximum restenotic level (19.24%vs. 21.46%,P>0.05) in the main branch were not significant different between jailed-balloon group and jailed guidewire group. But the maximum restenotic level in the opening of side branch was lower in jailed-balloon group than that of jailed guidewire group (51.2% vs. 72.46%, P < 0.01). Conclusion The jailed-balloon technique reduces the operation complications, exposure time and amount of contrast agent, and also saves surgical consumables. The procedure of branch with simple strategy is safe and effective in treatment of bifurcation lesions.

Objective: Full expression of class I HLA molecules on tumor cells is pivotal in priming the tumor antigen-specific CTLs for effective iramunotherapies. Tumor cells display abnonnal expression of HLA class I molecules in human ovarian carcinoma. Methods: In this study, the expression of class I molecules in human ovarian cancer cells was determined by using Western bloting, immunohistochemistry testing and flow cytometry. The mRNA of TAP (transporter associated with antigen processing) and LMP(low molecular weight polypeptide) were exannined at the same time by RT-PCR. Results: It has been shown that class I molecules were unable to be, or only weakly, expressed in five of eight ovarian cancer cell lines. On these cell lines abnormal in class I expression, no or only little mRNA were detected for TAP1, TAP2, LMP2 and(or) LMP7 genes. Class I expression, however, could be partially recovered by incubating the tumor cells at 25℃ when compared with those at 37℃ . Conclusion: The results suggested that the dysfunction of TAP and IMP genes, following by a defective expression of class I molecules, might be one of the mechanisms enable ovarian cancer cells to escape from immune surveillance.

Objective To establish a mouse lethal model of influenza B virus , which will facilitate the study on the mechanism of pathogenesis , transmission of influenza B virus , development of new vaccines and drugs against influenza B virus.Methods We obtained a mouse adaptive B/Lee/1940 virus by continuously passaging it in mice for 5 cycles.The P5 virus was propagated in MDCK cells , which was used for infecting mice .The body mass and survival rate of mice were monitored during the following 14 days after infection.At the same time,the 8 gene segments (PB2, PB1, PA, HA, NA/NB, NP, M, and NS) of P0 and P5 virus were sequenced and analyzed .Results and Conclusion Virus was detected in the lungs of mice in each generation in the process of virus passaging .The body mass of mice infected with the deadly mouse adaptive virus changed dramatically .The mortality of mice was 100%, and virus was detected in mouse lungs . Sequence analysis results indicated that the amino acid mutations occurred in PB 2 and NP.A series of experiments indicated that we had established a mouse lethal model of influenza B virus .

ObjectiveTo evaluate the therapeutic effect and toxicities of gemcitabine combined with cisplatin in the treatment of advanced or metastatic transitional cell carcinoma (TCC) of urinary tract. Methods Eighteen patients with advanced or metastatic TCC of urinary tract (15 cases of bladder TCC,2 of renal pelvic TCC,and 1 of ureteral TCC),who were pathologically confirmed,were treated with GC regimen (gemcitabine 1000 mg/m 2,iv infusion on day 1 and day 8;cisplatin 30 mg/m 2,iv infusion on day 2,day 8 and day 9).Before treatment, Karnofsy score for each patient was evaluated with a result of ≥60;liver and renal functions and blood routine test were normal.GC regimen was repeated for 2-3 cycles every 3-4 weeks and the response rate was evaluated.ResultsThree patients (16.7%) had complete response; 7(38.9%), partial response;5(27.8%),no response;and 3(16.7%) had progression.The overall response rate was 55.6%. The main toxic effects included decrease in white cell count (10 cases),anemia (7),nausea and vomiting (10) and constipation (8),which were mild or moderate and disappeared after stopping treatment.No chemotherapy-associated death occurred.ConclusionsGemcitabine combined with cisplatin in the treatment of advanced or metastatic transitional cell carcinoma of urinary tract is effective,and the toxicity is mild and tolerated. It is suggested that GC regimen can be used as the first line chemotherapy.

Objective:To explore the characteristics of human melanoma-specific antigen peptides by HLA-A2 restricted tumor-infiltrating lymphocytes.Methods:The HLA-A2 protein and polypeptides molecules were purified from the three tumor cell lines(624-Mel, Chap-Mel and JY) by immunoaffinity chromatography, after the peptides bound to HLA-A2 protein solution were acidified with acetic acid and boiled by high temperature, and centrifuged through an Ultra-CL filter, then the peptides extracts were fractionated by revered phase high pressure liquid chromatography(RP-HPLC). Individual fractions were assessed for their ability to reconstitute melanoma-specific epitopes by adding to the HLA-A2 Ag-procceing mutant cell, T2. The biological feature of one of three active peptides from RT-HPLC samples was performed by mass spectrometric analysis. The synthetic peptides identical to active peptide sequences were determined in the reconstitute test.Results:Three prominent peaks(P19, P25 and P31) of the fraction from 624-Mel were observed in the reconstitute test, TIL killing rate was 67% for (P31) peptide fraction. The mass spectrometric analysis of one of active peptides (P31) showed that at mass-to-charge ratio(m/z) 948 has been usually nine residues. The sequence is H+ Ala Lue Trp Lue Phe Phe Gly Val Lue OH-. The peptide synthesized comprising epitopes were verified.Conclusion:These results showed the peptides derived from active fractions were related to human melanoma-specific tumor antigen peptides recognized by HLA-A2-restriced TIL. These peptides could develop novel peptide-based an anti-tumor vaccine for immunotherapy of CTL.