Objective To study 18F-deoxyglueose positron emission tomography computed tomo graphy(18 FDG PET-CT) in the diagnosis of cervical lymph node(LN) metastasis from rabbit nasopharyngeal VX2 carcinoma.Methods Nasopharyngeal VX2 carcinoma model using 30 rabbits was established. 18 FDG PET-CT,MRI and pathological diagnosis were performed and compared.ResultsFifty-three cervi cal LNs were picked up from resected specimens of 30 rabbits with nasopharyngeal VX2 carcinoma.There were 42 pathologically confirmed positive LNs.Positivity rate was significantly correlated with the volume and the shortest diameter of the LNs (r = 9.18,P =0.007 ; r = 2.77,P = 0.008).The diagnostic sensitivity of PET-CT was 96% (24/25) and 29% (5/17) for LNs with volume >0.5 cm3 and ≤0.5 cm3 ,83% (25/30) and 33% (4/12) for LNs with the shortest diameter ≥0.5 cm and < 0.5 cm,respectively.The diagnostic sensitivity,specificity and accuracy of PET-CT was 69% (29/42) ,100% (11/11) and 95% (40/42) ,com paring with 60% (25/42) ,91% (10/11) and 83% (35/42) of MRl,respectively.The volume measured by PET-CT images was not significantly different from the pathologically measured volume (t =-1.23,P = 0.233) ,while the volume measured by MRI was significantly different from the pathologically measured vol ume (t =-3.99,P = 0.001).Conclusions The sensitivity,specificity and accuracy of PET-CT are better than those of MRl,especially for the cervical lymph nodes with volume >0.5 cm3 or the shortest diameter ≤ 0.5 cm.PET-CT also can be used to detect the smaller metastatic lymph nodes,though the false negative rate is higher.

Objective To investigate the clinical value of preoperative serum carcinoembryonic antigen (CEA) detection in the prediction of esophageal cancer lymph node metastasis.Methods The clinical data of 111 patients with esophageal cancer who were admitted to the Chaoyang Hospital of Capital Medical University between December 2010 and January 2014 were retrospectively analyzed.Patients received preoperative serum CEA examination and enhanced CT of the chest.The surgical procedures were selected according to the condition of patients, including radical resection of esophageal cancer via left thoracic approach, transabdominal right thoracic approach (open and laparoscopic surgeries), cervico-thoracic-abdominal triple incision (open and laparoscopic surgeries) and transabdominal incision.The international standard was used for tumor location and TNM stage of esophageal cancer.The count data and comparison of ordinal data in the univariate analysis were analyzed using the chi-square test, Fisher exact probability and rank-sum test, respectively.The multivariate analysis was done using the stepwise logistic regression.The ROC curve was used for evaluating diagnostic value of serum CEA examination and enhanced CT of the chest.All the 111 patients were divided into 4 groups according to the interquartile range results of the CEA examination, and the lymph node metastasis rates of 4 groups were compared by the chi-square test.Results All the 111 patients underwent successful radical resection of esophageal cancer after preoperative serum CEA detection and enhanced CT of the chest, including 40 via left thoracic approach, 56 via transabdominal right thoracic approach, 8 via cervico-thoracic-abdominal triple incision and 7 via transabdominal incision.There were 3 patients with upper thoracic esophageal cancer, 52 with middle thoracic esophageal cancer, 36 with lower thoracic esophageal cancer and 20 with cancer of gastro-esophageal junction.The postoperative pathological type included 84 squamous cell carcinomas, 23 adenocarcinomas and 4 other carcinomas.There were 44 patients with negative lymph node metastases and 67 with positive lymph node metastases.The positive rate of elevated serum CEA in the 111 patients was 36.04％ (40/111).Tumor location, pathological type and N stage of tumor were clinical pathological factors affecting the positive rate of serum CEA of patients (Z =6.815, 6.608, 16.928, P ＜0.05).N stage of tumor was an independent risk factor affecting the positive rate of serum CEA of patients by multivariate analysis [OR =2.206, 95％ confidence interval (CI) :1.370-3.552, P ＜ 0.05].The T stage of tumor and serum CEA level were risk factors affecting lymph node metastasis of esophageal cancer by univariate analysis (Z =18.971, x2=10.081, P ＜0.05), and those were also independent risk factors affecting lymph node metastasis of esophageal cancer by multivariate analysis (OR =3.558, 3.936, 95％ CI: 1.798-7.041, 1.480-10.469, P ＜0.05).The lymph node metastasis rates of esophageal cancer were 46.43％, 48.28％ , 55.56％ and 92.59％ when CEA level≤ 1.75 μg/L, 1.75 μg/L ＜ CEA level ≤ 2.68 μg/L, 2.68 μg/L ＜ CEA level ≤4.21 μg/L and CEA level ＞ 4.21 μg/L by the stratified analysis, respectively, with a significant difference among the 4 groups (x2=16.026, P ＜ 0.05).The areas under the curve of CEA level and enhanced CT of the chest for lymph node metastasis were 0.687 (95％ CI: 0.590-0.785) and 0.689 (95％ CI: 0.591-0.788) by ROC curve, which were significantly different from the area under the guides (P ＜0.05).The areas under the curve of CEA level and enhanced CT of the chest for lymph node metastasis were 0.785 (95％ CI: 0.697-0.873, P ＜ 0.05).Conclusions Serum CEA detection not only has certain predictive value for lymph node metastasis of esophageal cancer, but has a higher predictive value combined with enhanced CT of the chest.There is a risk of lymph node metastasis for patients with deep tumor invasion and elevated CEA level, and the range of lymph node dissection should be expanded.

Objective To use enzyme-linked immunosorbent assay (ELISA) for measuring thrombospondin-1 (TSP-1),and to analyze its diagnostic value for prostatic carcinoma.Methods The possible difficulties and the way to solve the difficulties with ELISA spot were explored first.Three agents which could segregate idio-antigen and one technique which could depurate proteinum were designed and developed.The non- idio- proteinum cross reaction problems were solved and the routine method to measure TSP-1 with ELISA was set up successfully.The serum TSP-1 was measured in 14 patients with benign prostatic hyperplasia (BPH) and 18 patients with prostatic carcinoma.Results The TSP-1 values were (73.77±12.72)% and (121.86±-19.47)% in prostatic carcinoma group and benign prostatic hyperplasia group,respectively (t= 8.44,P＜0.01).The diagnostic sensitivity and specificity of TSP-1 and prostate specific antigen (PSA) for prostatic cancer were 92.7%,88.9% and 85.7%,66.7%,respectively (P＜0.01).The area under the receiver operating characteristic curve (ROC) of TSP-1 and PSA were 0.9663 and 0.7421 (P＜0.05).Conclusions The determination of TSP-1 with ELISA is feasible.TSP-1 is an ideal diagnostic parameter for prostatic carcinoma and it may distinguish BPH from malignant prostatic disease more exactly than PSA.

Objective To extract the loci of murine MHC gene and construct plasmids.Methods The RNA of mice was extracted and reversely transcribed into cDNA.By using nested PCR,the products were connected with T vector,cloned,and sequenced.Subsequently,the genes were digested by endonucleases,connected with expression vector,and sequenced again to choose the correct clones.Results After the nested PCR,the products were approved by sequencing.After being connected with the vectors,they were approved again by sequencing and the correct clones were chosen.Conclusion All of the loci of the MHC gene can be obtained by nested PCR.The plasmids from the correct clone can be used in the further experiments of transferring the gene to mitigate the transplantation rejection.

OBJECTIVE To investigate the clinical pathological characteristics of differentiated thyroid carcinoma (DTC) in children and adolescents. METHODS The clinical data of 30 children and adolescents with DTC were retrospectively reviewed. Meanwhile the clinical pathological characteristics of DTC were analyzed according to patients' age and gender. RESULTS Papillary thyroid carcinoma (PTC) was found in 27 cases and follicular thyroid carcinoma (FTC) in 3 cases. The average diameter of tumors was (2.56±1.1) cm. In the group of children, the incidence of lymph node metastasis was 92.3% (12/13), pulmonary metastasis was 46.2% (6/13), and those in the group of adolescents was 88.2% (15/17) and 35.3% (6/17) respectively. Children group tended to present with more vascular invasion, thyroid capsule invasion, and invasion out of thyroid, and a higher rate of cervical lymph node metastasis (P=0.025, 0.007, 0.025, 0.033). CONCLUSION Thyroid carcinoma in childhood and adolescent has a stronger invasive feature. It is easy to local invasion, lymph node and distance metastasis.

OBJECTIVE To study the results of the reoperation for thyroid cancer. METHODS The clinical data of 288 cases who underwent reoperation for thyroid cancer were analyzed retrospectively. There were 69 male and 219 female. There were 249 cases (86.5 %) with papillary adenocarcinoma, 27 cases(9.4 %) with follicle adenocarcinoma, 6 cases (2 %) with medullar cancer, and 6 cases (2 %) with anaplastic cancer pathologically. The types of operation were lobectomy and near total lobectomy. The unilateral or bilateral neck dissections were performed in selected cases. RESULTS Pathological examination reveal that there were 63 cases of cancer residual in the ipsilateral side and 33 cases of the opposite side. The cervical node metastasis were present in 164 cases of patients at the same side. CONCLUSION The ipsilateral side lobaectomy and/or contralateral side near total lobectomy should be employed for the thyroid cancer patients. The neck dissection should be performed in most of the patients.

OBJECTIVE To observe the effects of RNA interference mediated PIK3CA gene silencing on the proliferation and invasiveness of laryngeal squamous cell carcinoma(LSCC) cells, and investigate the feasibility of PIK3CA gene as a potential therapeutic target in the treatment of LSCC. METHODS The lentiviral vector system expressing short hairpin RNA targeting PIK3CA gene(PIK3C-shRNA)was constructed and transfected subsequently into Hep-2 cells mediated by liposome in vitro. The expression of PIK3CA gene was detected by real-time RT-PCR and Western blot respectively. The proliferation of Hep-2 cells was measured by MTT, colony formation, and cell growth curve. The invasive power was determined by Boyden chamber model in vitro. RESULTS The lentiviral vector system expressing short hairpin PIK3CA- shRNA was constructed successfully. Compared with the control groups, the mRNA and protein expression of PIK3CA were significantly down-regulated(75% and 70% respectively)in the experimental group (P

Objective:To evaluate the cancer detection rate in patients with multiparametric magnetic resonance imaging (mpMRI) PI-RADS 1-2 prior to initial biopsy, and analyze the risk factors of prostate cancer.Methods:A total of 196 patients undergoing initial prostate biopsy between July 2011 and June 2018 were retrospectively analyzed. According to ESUR PI-RADS system, the patients’ PI-RADS score was 1 and 2, with the mean age of 66.6±9.0 years, and the median PSA 7.44 ng/ml. Twenty-eight patients were enrolled with PSA<4 ng/ml but with abnormal directeral rectun examination. The rest 168 patients were enrolled with elevated PSA. According to the Epstein prostate risk classification criteria, clinically insignificant prostate cancer was defined as: PSA density ≤0.15 ng/ml 2, Gleason score≤6, less than 3 positive needles, <50% puncture length. If any of the above is not met, the diagnosis should be clinically significant prostate cancer(CsPCa). T test or Mann-Whitney U test were used for comparison between groups. Risk factors for diagnosis of prostate cancer and CsPCa were analyzed by chi square test(or Fisher’s exact probability method) and multivariate logistic regression analysis. Results:There were 42(21.4%) patients diagnosed with prostate cancer, 30(15.3%)patients were CsPCa. The negative predictive value of mpMRI was 78.6%(154/196)for prostate cancer overall, and 84.7%(166/196)for CsPCa. Patients with higher age and PSA density were associated with higher possibility of prostate cancer. Higher age, PSA level, PSA density, and lower PSA ratio were associated with higher possibility of CsPCa. Multivariate logistic regression analysis showed that PSA density>0.15 ng/ml 2( OR=2.94, 95% CI 1.45-5.95) was independent risk factor of prostate cancer.Ages over 70 years( OR=2.49, 95% CI 1.22-5.07), PSA ratio<0.2( OR=3.70, 95% CI 1.25-11.23), PSA density>0.15 ng/ml 2( OR=5.77, 95% CI 1.96-16.96) were independent risk factors of CsPCa ( P<0.05). Conclusions:The detection rate of prostate cancer was 21.4% in patients with elevated PSA or abnormal digital prostate examination but with PI-RADS score of 1-2. Higher age and PSA density were associated with higher risk of prostate cancer. The detection rate of CsPCa was 15.3%. Ages over 70 years, PSA ratio<0.2, PSA density>0.15 ng/ml 2 were independent risk factors of CsPCa.

Objective To evaluate the morbidity trend of prostate cancer since the clinical usage of PSA was introduced in Beijing Hospital.Methods Retrospectively we analyzed prostate cancer cases diagnosed in Beijing Hospital from 1995 to 2008.The incidence, age, PSA and clinical stage at diagnosis were taken into account.Results Four hundred and thirty-two cases were enrolled into the study.Who were aged 40 - 90 years old, mean age 72.0 ± 7.8 years.The most frequent age at diagnosis was 70 to 79 years.The incidence increased annually with the most significant increase taking place in 2007 and 2008.Compared with the period 1995 to 1999, the localized prostate cancer rate between 2004 and 2008 increased from 23.9% to 36.3%; the metastatic prostate cancer rate decreased from 49.3% to 32.1%; the rate of patients with PSA 4 - 10 ng,/ml increased from 12.7% to 29.2%; the rate of PSA ＞ 100 ng/ml decreased from 22.5% to 13.2%.Conclusions The incidence and early detection rate of prostate cancer in Beijing Hospital increased from 1995 to 2008.The age at diagnosis had not significantly changed.However, the early detection rate should be improved.

COVID-19 is caused by the 2019 novel coronavirus, which is characterized by hidden onset, long incubation period, and high contagion. The study found that the COVID-19 not only attacks the respiratory system, but also affects other systems such as the heart, kidney, and digestive tract, and could be combined with multiple system diseases such as acute cerebrovascular disease. If doctors, especially non-infective or respiratory doctors, do not pay great attention to the patient when they are receiving patients, and take good care of them, they may easily cause their own infection. This article summarizes the case of a concealed onset COVID-19 patient with cerebral infarction, which caused a medical staff infection after intravenous thrombolytic therapy, explores its clinical characteristics, treatment process and analyzes its prevention and control links to help the epidemic situation. In the prevention and control, the first-time doctor should pay attention to identification, reduce missed diagnosis, and scientific investigation to reduce occupational infection.