Correlation Between Apparent Diffusion Coefficient and IDH-1/1p19q Genotype of Glioma / 肿瘤防治研究

Objective To investigate the correlation between ADC value and glioma IDH-1/1p19q genotype. Methods The MRI features and molecular pathological results of 69 patients with pathologically confirmed diagnosis of WHO grade Ⅱ/Ⅲ glioma between March 2013 and December 2020 were retrospectively analyzed. The diagnostic performance of ADC values on glioma genotypes (IDH-1, 1p19q) was evaluated using the ROC curve of the subjects' working characteristics. Results The ADCmean, ADCmin, rADCmean, and rADCmin in the IDH-1 mutation group were significantly higher than those in the IDH-1 wild group (P < 0.05, P < 0.01, P < 0.05, P < 0.01). The use of the rADCmin threshold (0.979×103mm2/s) had the highest efficacy (AUC=0.770) for diagnosis of IDH-1 mutant and IDH-1 wild-type gliomas as well as sensitivity and specificity of 84.61% and 59.09%, respectively. Conclusion ADC can be used as an imaging biomarker for noninvasive prediction of IDH-1 mutant and wild-type Ⅱ /Ⅲ gliomas.

Advances in Combined Immunotherapy for Triple Negative Breast Cancer / 肿瘤防治研究

The triple-negative breast cancer has a relatively poor prognosis with limited therapeutic options. This subtype is highly immunogenetic and exhibits rich tumor infiltrated lymphocytes in the tumor microenvironment. However, immunotherapy alone is less effective as compared with the doublet of chemotherapy and immunotherapy in TNBC. The efficacy in early recurrence settings of mTNBC exceeds that in heavily treated subgroups. Meanwhile, other combinations including anti-angiogenesis, immune modulators, and PARPi elicit a promising effect. Herein, this paper reviews the progress of efficacy, safety, and the outlook in the immunotherapy of TNBC disease.

Target-responsive subcellular catabolism analysis for early-stage antibody-drug conjugates screening and assessment

Events including antibody‒antigen affinity, internalization, trafficking and lysosomal proteolysis combinatorially determine the efficiency of antibody-drug conjugate (ADC) catabolism and hence the toxicity. Nevertheless, an approach that conveniently identifies proteins requisite for payload release and the ensuing toxicity for mechanistic studies and quality assessment is lacking. Considering the plethora of ADC candidates under development, we developed a target-responsive subcellular catabolism (TARSC) approach that examines ADC catabolism and probes changes in response to targeted interferences of proteins of interest. We firstly applied TARSC to study the commercial T-DM1 and the biosimilar. We recorded unequivocal catabolic behaviors regardless of the absence and presence of the targeted interferences. Their negligible differences in TARSC profiles agreed with their undifferentiated anti-tumoral efficacy according to further

The role of caveolin-1 in the biofate and efficacy of anti-tumor drugs and their nano-drug delivery systems

As one of the most important components of caveolae, caveolin-1 is involved in caveolae-mediated endocytosis and transcytosis pathways, and also plays a role in regulating the cell membrane cholesterol homeostasis and mediating signal transduction. In recent years, the relationship between the expression level of caveolin-1 in the tumor microenvironment and the prognostic effect of tumor treatment and drug treatment resistance has also been widely explored. In addition, the interplay between caveolin-1 and nano-drugs is bidirectional. Caveolin-1 could determine the intracellular biofate of specific nano-drugs, preventing from lysosomal degradation, and facilitate them penetrate into deeper site of tumors by transcytosis; while some nanocarriers could also affect caveolin-1 levels in tumor cells, thereby changing certain biophysical function of cells. This article reviews the role of caveolin-1 in tumor prognosis, chemotherapeutic drug resistance, antibody drug sensitivity, and nano-drug delivery, providing a reference for the further application of caveolin-1 in nano-drug delivery systems.

Role of diffusion: weighted magnetic resonance imaging in evaluation of renal masses

Background: Diffusion-weighted magnetic resonance imaging (DWI) is a valuable tool to narrow down the differential diagnosis of renal masses. Studies have shown that benign renal masses have higher Apparent diffusion coefficient (ADC) value than malignant renal masses. Aim of study was to evaluate the role of diffusion-weighted magnetic resonance imaging in the characterization of renal masses.Methods: The study was conducted in department of Radio diagnosis at ABVIMS and Dr. RML Hospital, New Delhi between June 2017 to March 2019. This was a cross-sectional observational study comprising of 28 patients. Patients found to have renal mass on ultrasound and computed tomography (CT) were evaluated further on 3T siemens Magnetic resonance imaging (MRI) scanner. In addition to routine sequences, DWI using b value of 0,500,1000 s/mm2 sequence was used to study to differentiate benign and malignant renal masses.Results: Of a total of 28 cases, the most common malignant mass was renal cell carcinoma (RCC). Angiomyolipoma (AML) was the most common benign masses. DWI showed low ADC values in most of the malignant masses and high ADC values in most of the benign masses. The cut-off level of ADC value for differentiation among benign and malignant renal masses was 1.08×10-3 mm2/s. DWI-MR findings were correlated with histopathological diagnosis.Conclusion: DWI with ADC measurements are a non-invasive, problem solving tool for characterization of renal masses helping to differentiate malignant from benign masses.

Use of MRI Apparent Diffusion Coefficient to Noninvasively Differentiate between the Histologic Grades of Meningioma.

It is well known in the literature that Apparent Diffusion Coefficient (ADC) obtained during diffusion-weighted MRI of brain is sensitive in detecting and differentiating low-grade and aggressive meningiomas. However, other studies establish no correlation between mean-ADC and ultimate classification as benign, atypical or malignant. We wanted to assess the correlation between, A. mean of MRI Apparent Diffusion Coefficient (mean-ADC) and B. meningioma biomarker Ki-67 proliferation index, in cases of both low-grade and aggressive meningioma. We also wanted to assess the sensitivity of mean-ADC for diagnosing an aggressive meningioma.METHODSWe analysed 66 surgically treated meningioma patients with complete histopathology report (HPR) in Government Medical College, Kozhikode during the period of study (Nov-2017-Oct-2018), also having a pre-operative mean-ADC value during Diffusion Weighted Imaging (DWI) investigation at the same centre. For the latter, a standard MRI brain protocol including diffusion imaging was conducted and ADC map was generated. Regions of interest (ROIs) were manually drawn within the tumour on ADC map and mean-ADC values were measured.RESULTSUsing Pearson correlation coefficient, we found a significant negative correlation between Ki-67 proliferation index and mean-ADC in meningioma cases. We also calculate 0.79 x 10-3 mm2/s being a reasonable mean-ADC cut-off value due to its sensitivity of 84% and specificity of 77% in differentiating between typical and atypical meningiomas.CONCLUSIONSThe non-invasive calculation of mean-ADC is a valid diagnostic tool. Further, mean ADC can be used as a good test to differentiate typical and atypical meningiomas. The latter is a particularly valid conclusion, since there were few results from conventional MRI studies to differentiate between various typical and atypical meningiomas.

Current LC-MS-based strategies for characterization and quantification of antibody-drug conjugates / 药物分析学报

The past few years have witnessed enormous progresses in the development of antibody-drug conju-gates (ADCs). Consequently, comprehensive analysis of ADCs in biological systems is critical in sup-porting discovery, development and evaluation of these agents. Liquid chromatography-mass spectrometry (LC-MS) has emerged as a promising and versatile tool for ADC analysis across a wide range of scenarios, owing to its multiplexing ability, rapid method development, as well as the capability of analyzing a variety of targets ranging from small-molecule payloads to the intact protein with a high, molecular resolution. However, despite this tremendous potential, challenges persist due to the high complexity in both the ADC molecules and the related biological systems. This review summarizes the up-to-date LC-MS-based strategies in ADC analysis and discusses the challenges and opportunities in this rapidly-evolving field.

Evaluation and prediction of therapeutic response to neoadjuvant androgen deprivation therapy for prostate cancer by diffusion weighted imaging / 中华泌尿外科杂志

Objective To evaluate the effect of neoadjuvant androgen deprivation therapy (ADT) for prostate cancer on diffusion weighted imaging base on the pathological results after radical prostatectomy.Methods Medical records of 33 patients diagnosed with prostate cancer and treated with neoadjuvant androgen deprivation therapy and radical prostatectomy between January 2016 and September 2019 at Peking University First Hospital were retrospectively reviewed.Average age of patients was 67.7 (49-81) years old.All of the patients underwent prostate MRI examination before and after neoadjuvant ADT.Results Mean prostate volume after neoadjuvant ADT is 28.5 (6.25-113.76) em3,which decreased significantly by therapy (Z =-4.458,P ＜ 0.05).Apparent diffusion coefficient (ADC) values increased significantly in tumor (1.070 ± 0.325) vs.(0.828 ± 0.291) × 10-3 mm2/s (P ＜ 0.001) and decreased in benign prostatic tissue (P ＜ 0.05).Relative changes in ADC differed significantly between low-median level ISUP group and high level ISUP group (0.315 ± 0.173) vs.(0.164 ± 0.224) × 10-3 mm2/s (P ＜ 0.05),as well as obvious reaction group and focal reaction group(0.278 ± 0.21) vs.(0.094 ± 0.119) × 10-3 mm2/s (P ＜ 0.05).Conclusions There were significant,quantitative measurable changes of ADC value in prostate cancer after neoadjuvant ADT.DWI can be used to assess the efficacy of neoadjuvant ADT for prostate cancer as well as predicting pathological features.

Coeficiente de difusión aparente en tejido encefálico: valores de normalidad en población colombiana clínicamente sana / Apparent diffusion coefficient in brain tissue: values of normality in clinically healthy colombian population

Resumen Introducción: Las secuencias de difusión en resonancia magnética, incluido el coeficiente de difusión aparente (ADC), representan una herramienta fundamental para el radiólogo en el diagnóstico clínico. Sin embargo, no existe estandarización para las medidas entre los límites normales o un rango de valores normales del ADC. Objetivo: Determinar valores normales del ADC en el tejido encefálico para la población clínica y radiológicamente sana. Métodos: Estudio de corte transversal sobre datos retrospectivos, se midieron valores del ADC para 21 regiones encefálicas (sustancia gris frontal, parietal y temporal, sustancia blanca frontal y parietal, núcleo caudado, putamen, tálamo, cápsula interna, hemisferios cerebelosos bilateralmente y puente del tallo cerebral) en 90 sujetos clínica y radiológicamente sanos, en dos clínicas privadas de Bogotá. Resultados: Valores normales del ADC, en población clínica y radiológicamente sana, en 21 territorios encefálicos, análisis comparativo de los resultados según el sexo y edad de los pacientes, y correlación entre las mediciones realizadas por dos investigadores. Conclusiones: Los hallazgos sirven como referencia para la población colombiana y latinoamericana normal, establecen un punto de comparación para la evaluación de patologías intracraneanas, y abre la posibilidad a desarrollar nuevos proyectos de investigación que busquen determinar valores de ADC en población enferma.

Abstract Introduction: The diffusion sequences in magnetic resonance, including the apparent diffusion coefficient (ADC), represent a fundamental tool for the radiologist in the clinical diagnosis. However, there is no standardization for measurements between normal limits or a range of normal ADC values. Objective: To determine normal ADC values ​​in the brain tissue for the clinical and radiologically healthy population. Methods: Cross-sectional study on retrospective data, ADC values ​​were measured for 21 encephalic regions (frontal gray, parietal and temporal substance, frontal and parietal white matter, caudate nucleus, putamen, thalamus, internal capsule, cerebellar hemispheres bilaterally and bridge of the brainstem) in 90 clinically and radiologically healthy subjects, in two private clinics in Bogotá. Results: Normal ADC values, in a clinical and radiologically healthy population, in 21 encephalic territories, comparative analysis of the results according to the sex and age of the patients, and correlation between the measurements made by two researchers. Conclusions: The findings serve as a reference for the Colombian and normal Latin American population, establish a point of comparison for the evaluation of intracranial pathologies, and open the possibility to develop new research projects that seek to determine ADC values ​​in sick population.

Discursos sobre educação física escolar e o protagonismo da midiatização esportiva / Discourses on school physical education and the protagonism of sports mediatization / Discursos sobre educación física escolar y el protagonismo de la mediatización deportiva

A pesquisa desenvolve reflexões sobre sentidos enunciados em reportagens exibidas no programa televisivo Esporte Espetacular durante o mês de janeiro de 2017. O conjunto enunciativo investigado apresentou como as aulas de educação física escolar são desenvolvidas em quatro países: Brasil, Inglaterra, Estados Unidos e Japão. Metodologicamente, a Análise de Discurso Crítica (ADC) proporcionou a identificação das representações relacionais entre esporte e educação, e as estratégias discursivas construídas nessas reportagens. A reflexão sobre o texto/imagem como discurso social e a potência das representações esportivas como fenômeno discursivo e ideológico, torna a enunciação esportiva o currículo majoritário no ambiente educacional relativo às aulas de educação física escolar.

The research develops reflections on the meanings expressed in reports presented in the television program Esporte Espetacular during the month of January, 2017. The enunciative set investigated presented how the school physical education classes are developed in four countries: Brazil, England, United States and Japan. Methodologically, the Critical Discourse Analysis (ADC) provided the identification of the relational representations between sport and education, and the discursive strategies constructed in these reports. The reflection on the text/image as a social discourse and the power of sports representations as a discursive and ideological phenomenon, makes sports enunciation the main curriculum in the educational environment related to school physical education classes.

La investigación desarrolla reflexiones sobre sentidos enunciados en reportajes exhibidos en el programa televisivo Esporte Espectacular durante el mes de enero de 2017. El conjunto enunciativo investigado presentó cómo las clases de educación física escolar se desarrollan en cuatro países: Brasil, Inglaterra, Estados Unidos y Japón. Metodológicamente, el Análisis de Discurso Crítico (ADC) proporcionó la identificación de las representaciones relacionales entre deporte y educación, y las estrategias discursivas construidas en esos reportajes. La reflexión sobre el texto/imagen como discurso social y la potencia de las representaciones deportivas como fenómeno discursivo e ideológico, hace la enunciación deportiva el currículo mayoritario en el ambiente educativo relativo a las clases de educación física escolar.

Measurement of Tumor Pressure and Strategies of Imaging Tumor Pressure for Radioimmunotherapy / 대한핵의학회잡지

Tumor interstitial pressure is a fundamental feature of cancer biology. Elevation in tumor pressure affects the efficacy of cancer treatment and results in the heterogenous intratumoral distribution of drugs and macromolecules. Monoclonal antibodies (mAb) play a prominent role in cancer therapy and molecular nuclear imaging. Therapy using mAb labeled with radionuclides—also known as radioimmunotherapy (RIT)—is an effective form of cancer treatment. RIT is clinically effective for the treatment of lymphoma and other blood cancers; however, its clinical use for solid tumor was limited because their high interstitial pressure prevents mAb from penetrating into the tumor. This pressure can be decreased using anti-cancer drugs or additional external therapy. In this paper, we reviewed the intratumoral pressure using direct tumor-pressure measurement strategies, such as the wick-in-needle and pressure catheter transducer method, and indirect tumor-pressure measurement strategies via magnetic resonance.

Experimental study of diffusion kurtosis imaging in predicting radiotherapy sensitivity of esophageal carcinoma / 中华放射医学与防护杂志

Objective To explore the value of diffusion kurtosis imaging (DKI) in predicting radiotherapy sensitivity of esophageal cancer from the animal model level.Methods BALB/c nude mice were subcutaneously injected with Eca-109 cell lines to form xenograft tumors.The tumors received a single dose of 15 Gy (6 MV X-rays) in the experimental group or had no any treatment as control.The volume of transplanted tumor,the change of ADC,MK and MD values,and the tumor cell density and necrosis ratio of these two groups were observed at the corresponding time points.Results The growth of xenograft volume in the experimental group was suppressed and it was significantly smaller than that in the control group (t=3.206-6.149,P＜0.05) at the 7th day after radiotherapy.From the 3rd day after radiotherapy,the ADC and MD values of the experimental group were significantly higher than those of the control group,and the MK values was lower than those in the control group (tADC =-11.018--2.049,tMD =-6.609--2.052,tMK =2.492-9.323,P＜0.05).Meanwhile,the tumor cell density of the control group was higher than that of the experimental group,and the proportion of necrosis in the experimental group was higher than that in the control group (tdensity =-8.387--2.239,t is =2.980-17.430,P＜0.05).Conclusions A single large dose radiation could inhibit the growth of xenograft.ADC,MK,MD values changed at the early stage prior to morphological changes of tumor in consistent with the change of cell density and necrosis ratio.DKI has the potential value in predicting radiotherapy sensitivity of esophageal carcinoma.

FPGA-Based Interface of Digital DAQ System for Double-Scattering Compton Camera / 대한핵의학회잡지

PURPOSE: The double-scattering Compton camera (DSCC) is a radiation imaging system that can provide both unknown source energy spectra and 3D spatial source distributions. The energies and detection locations measured in coincidence with three CdZnTe (CZT) detectors contribute to reconstructing emission energies and a spatial image based on conical surface integrals. In this study, we developed a digital data acquisition (DAQ) board to support our research into coincidence detection in the DSCC.METHODS: The main components of the digital DAQ board were 12 ADCs and one field programmable gate array (FPGA). The ADCs digitized the analog 96-channel CZTsignals at a sampling rate of 50MHz and transferred the serialized ADC samples and the bit and frame clocks to the FPGA. In order to correctly capture the ADC sample bits in the FPGA, we conducted individual sync calibrations for all the ADC channels to align the bit and frame clocks to the right positions of the ADC sample bits. The FPGA logic design was composed of IDELAYand IDDR components, six shift registers, and bit slip buffer resources.RESULTS: Using a Deskew test pattern, the delay value of the IDELAY component was determined to align the bit clock to the center of each sample bit.We determined the bit slip in the 12-bit ADC sample using an MSB test pattern by checking where the MSB value of one is located in the captured parallel data.CONCLUSION: After sync calibration, we tested the interface between the ADCs and the FPGA with a synthetic analog Gaussian signal. The 96 ADC channels yielded a mean R2 goodness-of-fit value of 0.95 between the Gaussian curve and the captured 12-bit parallel data.

A brief analysis of bifunctional molecules / 药学学报

Selectivity of drug action is a determinant for wide therapeutic window and less adverse response. From the viewpoint of molecular structure the conception and strategy of drug design are mainly embodied in raising selectivity. For the target-based drug discovery it is crucial to precisely obliterate detrimental targets in dimension of time and space, so as to efficaciously translate the in vitro active compounds into in vivo therapeutic medicines. To realize this translation drug molecules must be accurately transported to and destroy the harmful targets. To this end, chemical structures of drugs must be manipulated in multiple dimensions. This article attempts to concisely describe several kinds of bifunctional molecules for raising selectivity from the standpoint of medicinal chemistry. The bifunctionality of antibody-drug conjugates (ADCs) involves in the guidance and carrier of the antibody to guide ADC and reach to target cells, and simultaneously injury quality of the toxin moiety of ADC interacts with and destroys targets. Based upon target 3D structures design of irreversible inhibitors consist in connecting an appropriate electrophilic moiety to a well-defined ligand to endow the molecule with an additional ability to covalently bond to a specific amino acid residue. Hydrophobic tag (HyT), proteosis-targeting chimera (PROTAC), and degradation tag (dTAG) are new developed technologies, which are structurally characterized by bifunctionality, and mechanistically these compounds are capable of recruiting protein of interest (POI), inducing protein-protein interaction (PPI), and cleaving POI. In spite of large molecular size and the bottleneck of pharmacokinetic and physicochemical properties these technologies still have broad development prospect owing to high selectivity and wide adaptations.

Diffusion-Weighted Imaging of Upper Abdominal Organs Acquired with Multiple B-Value Combinations: Value of Normalization Using Spleen as the Reference Organ

OBJECTIVE: To compare apparent diffusion coefficient (ADC) of the upper abdominal organs acquired with multiple b-value combinations and to investigate usefulness of normalization. MATERIALS AND METHODS: We retrospectively analyzed data, including 3T diffusion-weighted images, of 100 patients (56 men, 44 women; mean age, 63.9) that underwent liver magnetic resonance imaging. An ADC map was derived with the following six b-value combinations: b1 = 0, 50, 400, 800; b2 = 0, 800; b3 = 0, 50, 800; b4 = 0, 400, 800; b5 = 50, 800; and b6 = 50, 400, 800 s/mm2. ADC values of the right liver lobe, left liver lobe, spleen, pancreas, right kidney, and left kidney were measured. ADC values of the spleen were used for normalization. Intraclass correlation coefficients (ICCs), comparison of dependent ICCs, and repeated-measures analysis of variance were used for statistical analysis. RESULTS: Intraclass correlation coefficients of the original ADC revealed moderate to substantial agreement (0.5145–0.6509), while normalized ADCs revealed almost perfect agreement (0.8014–0.8569). ICC of normalized ADC for all anatomical regions revealed significantly less variability than that of the original ADC (p < 0.05). Coefficient of variance for normalized ADC was significantly lower than that for the original ADC (3.0.3.8% vs. 4.8.8.8%, p < 0.05). CONCLUSION: Normalization of the ADC values of the upper abdominal organs using the spleen as the reference organ significantly decreased variability in ADC measurement acquired with multiple b-value combinations.

Application value of magnetic resonance DWI high b-value and ADC value in hyperacute cerebral ischemia / 重庆医学

Objective To investigate the value of DWI high b value and ADC value in the diagnosis of hyperacute cerebral is-chemia.Methods Adult SD rats were selected and divided into the control and ischemic group by adopting the random number table method,the ischemic group was re-divided into 0.25,0.50,2.00,4.00、6.00 h groups according to the ischemic time,6 cases in each group with a total of 42 cases.The ischemic group conducted the right middle cerebral artery occlusion(MCAO)for performing the head T2WI and DWI scanning(b values were 0,400,800,2 000,3 000 s/mm2),the CNR and SNR values were recorded,rs-T2WI, rs-DWI and relative apparent diffusion coefficient(rADC)were measured.Then the imaging change of ischemic area was observed. The sensitivity and specificity were detected.Results In b=2 000 s/mm2and 3 000 s/mm2,the diagnostic rates of DWI for hyper-acute cerebral ischemia were obviously higher than those in b=400 s/mm2and 800 s/mm2,and when the b values were 400,800, 2 000,3 000 s/mm2,the sensitivities were 16.7%,50.0%,100.0% and 100.0% respectively and the specificities were 16.7%, 50.0%,100.0% and 100.0% respectively.The difference of ADC values under different b values had statistical significance(P<0.05).Conclusion High b value DWI in the diagnosis of hyperacute ischemia is significantly better than that of low b value,espe-cially in the aspect of displaying the lesion at 0.25,0.50 h cerebral ischemia.

Diffusion-Weighted MR Imaging of Unicystic Odontogenic Tumors for Differentiation of Unicystic Ameloblastomas from Keratocystic Odontogenic Tumors

OBJECTIVE: Differentiating unicystic ameloblastomas from keratocystic odontogenic tumors (KCOT) is necessary for the planning of different treatment strategies; however, it is difficult based on conventional CT and MR sequences alone. The purpose of this study was to investigate the utility of diffusion-weighted imaging (DWI) and apparent diffusion coefficients (ADCs) in the differentiation of the two tumors. MATERIALS AND METHODS: We prospectively studied 40 patients with odontogenic cysts and tumors of the maxillomandibular region using conventional MR imaging and DWI. ADCs were measured using 2 b factors (500 and 1000). RESULTS: Unicystic ameloblastomas (n = 11) showed free diffusion on DWI and a mean ADC value of 2.309 ± 0.17 × 10-3 mm2/s. KCOT (n = 15) showed restricted diffusion on DWI with a mean ADC value of 0.923 ± 0.20 × 10-3 mm2/s. The ADC values of unicystic ameloblastomas were significantly higher than those of KCOT (p < 0.001, Mann-Whitney U-test). An ADC cut-off value of 2.0 × 10-3 mm2/s to differentiate KCOT and unicystic ameloblastomas resulted in a 100% sensitivity and 100% specificity. Dentigerous cysts (n = 3) showed restricted diffusion on DWI and similar ADC values (1.257 ± 0.05 × 10-3 mm2/s) to those of KCOT. CONCLUSION: Diffusion-weighted imaging and ADC determination can be used as an adjuvant tool to differentiate between unicystic ameloblastomas and KCOT, although the ADC values of dentigerous cysts overlap with those of KCOT.

Mac-2 binding protein glycosylation isomer compared with imaging examination in the prognosis of hepat-ic fibrosis in patients with hepatitis C / 实用医学杂志

Objective To explore and compare the prognostic ability of the serum level of M2BPGi and MRI imaging technology for hepatic fibrosis. Methods 118 patients who were diagnosed as hepatitis C were enrolled from March 2014 to March 2015 in our hospital.Their baseline data were recorded,and they were texted by imaging examination of MRI.Then all patients were followed-up 2 years.The patients were divided into hepatic fibrosis group and control group according to the follow-up results.Univariate analysis and Cox model were used to show that the prognostic factors influencing the prognosis of hepatic fibrosis in patients;meanwhile,the statistical significance factors were calculated by ROC curve.Results The serological markers of IV-C,HA and serum level of M2BPGi in hepatic fibrosis group were higher than those in control group,but its ADC values of liver was lower than those in control group,and the difference was statistically significant(P < 0.05). COX regression analysis showed that the difference of M2BPGi(RR = 4.282,P = 0.003)and ADC values(RR = 0.654,P = 0.004). The ROC analysis of the hepatic fibrosis group and the control group showed that the AUC of the combination was 0.865,the sensitivity and specificity were 95.2%,60.5%,respectively.Conclusion The clinical value the com-bined prognostic of them is of high prognostic efficacy,which is hopeful to be used as an auxiliary prognostic meth-od in clinic.

Design of a high speed data acquisition system for biological mass spectrometers / 军事医学

Objective To develop a high-speed data acquisition system with sampling frequency of 2 GHz to meet the requirement of accurate measurement of flight time.Methods The ALTERA STRATIX Ⅲ series FPGA was used as the main control chip, matching with high-performance ADC chip with sampling frequency up to 2 GHz and sampling accuracy up to 12 bit, while extending 512 MB DDR3 SDRAM for data cache and exchanging data with the host computer through Gigabit Ethernet.In addition, a variety of PCB wiring methods were used to effectively ensure the signal integrity.Results The 250 MHz sine signal was input into the data acquisition board with 2 GHz sampling frequency,by analyzing and calculating the sampling data,acquired the following performance index of SNR=44.6639 and ENOB=7.1.Conclusion This high-speed data acquisition system based on ADC technology is a fast and reliable path and method for the measurement and analysis of biological mass spectrometry data.

A Preliminary exploration of the intravoxel incoherent motion applied in the preoperative mediastinal lymph node metastasis of lung cancer / 中华胸心血管外科杂志

Objective The aim of this study was to investigate the diagnostic value of the intravoxel incoherent motion (IVIM) for discriminating nonmetastatic from metastatic mediastinal lymph nodes in lung cancer.Methods IVIM was performed preoperatively on 66 patients with lung cancer during October 2015 to June 2016 in Capital Medical University Affiliated Beijing Chaoyang Hospital.Preoperative examination including the chest MRI scan,chest CT,head MRI,bone scan-ning and the cardiopulmonary function.None of the patients was undergone any kind of treatment about the cancer before the examinations,the neoadjuvant chemotherapy or radiation therapy,immunotherapy and gene targeted therapy were included.Measured the short axis diameter and the IVIM parameters of the mediastinal lymph nodes,apparent diffusion coefficient(ADC),diffusion coefficient(D),pseudo-diffusion coefficient(D *),and perfusion fraction(f).All the patients underwent the lobectomy or wedge resection and lymph node dissection or systematic sampling.By comparing the IVIM parameters of the nonmetastatic and metastatic mediastinal lymph nodes according to the pathological examination,draw the ROC curves to find the best cutoff value for diagnosis.And 42 cases were used to comparing the value of the MRI and CT in differential diagnosis.Results MRI measured 184 groups mediastinal lymph nodes,including 164 groups without metastasis,20 groups with metastasis.The ADC,D,D *,f values and short axis diameter of the nonmetastatic lymph nodes(n =164) were(2.880 ± 0.785) × 10-3 mm2/s,(0.670 ± 0.179) × 10-3 mm2/s,(0.383 ± 0.123) × 10-3 mm2/s,0.422 ± 0.119,(6.546 ± 1.932) mm,respectively,and (1.897 ±0.657) × 10-3 mm2/s,(0.472 ±0.210) × 10-3 mm2/s,(0.354 ±0.130) × 10-3 mm2/s,0.412 ±0.090,(7.510 ± 2.773) mm respectively for the metastatic lymph nodes (n =20).The ADC and D value of the nonmetastatic lymph nodes were significantly higher than the metastatic lymph nodes(P ＜0.01).While the other paraneters(D *,f,and short axis diameter) between the two groups did not show significantly different.Optimal cutoff values(area under the curve,sensitivity,and specificity) for distinguishing metastatic from nonmetastatic lymph nodes were as follows:ADC =1.890 × 10-3 mm2/s (0.871,92.7％,80.0％);and D =0.648 × 10-3mm2/s(0.740,70.0％,84.1％).Conclusion IVIM is useful to distinguish metastatic from nonmetastatic lymph nodes in lung cancer.The ADC and the D values are significant higher in metastatic lymph nodes,which more sensitive than the other parameters(D *,f,and short axis diameter).As a result,IVIM can be used in the N-stage diagnosis of lung cancer.