Objective:To explore the relationship between drug resistance occurrence and the distribution pattern of polymorphic loci in individuals with human immunodeficiency virus infection/acquired immunodeficiency syndrome (HIV/AIDS) treated with highly active anti-retroviral therapy (HAART).Methods:HAART-failed HIV/AIDS patients who successfully amplified the gene sequences of the pol region between June 2015 and December 2021 from 16 prefecture-level administrative regions in Yunnan Province were included.The resistant sequences were classified using the human immunodeficiency virus (HIV) basic local alignment search tool (BLAST) and validated through MEGA 6.0, and the obtained sequences were submitted to the Stanford University HIV Drug Resistance Database to identify drug resistance loci. The distribution of polymorphic loci was analyzed across patients exhibiting varying degrees of drug resistance, different treatment regimens and distinct HIV-1 subtypes.Changes of the frequencies of polymorphic loci in patients with different degrees of drug resistance were analyzed using trend chi-square test. Statistical comparisons and further paired comparisons were performed using chi-square test.Results:Gene sequences were amplified from 1 453 patients, and the resistance testing results showed 954 sensitive, 224 potentially or low resistant, 189 moderately resistant, and 86 highly resistant patients. The frequencies of mutations I15V, L19I, D60E in the HIV-1 protease region (PR region) and E36A, T39D, S48T mutations in the HIV-1 reverse transcriptase region (RT region) showed a decreasing trend as the degree of HIV-1 resistance escalated ( χ2trend=19.86, 9.16, 13.66, 37.64, 18.44 and 40.86, respectively, all P<0.01). Conversely, the mutations V77I in the PR region and K122E in the RT region showed an ascending trend ( χ2trend=12.19 and 10.03, respectively, both P<0.01). Distinct treatment groups, namely zidovudine (AZT)+ lamivudine (3TC)+ lopinavir/ritonavir (LPV/r), AZT+ 3TC+ efavirenz (EFV), AZT+ 3TC+ nevirapine (NVP), and tenofovir (TDF)+ 3TC+ EFV, were examined. Statistically significant differences in the frequencies of mutations E35D, M36I, and D60E in the PR region, as well as S48T, K122E, and R211K in the RT region, were observed among these treatment groups ( χ2=22.46, 9.32, 14.46, 26.85, 18.92 and 24.26, respectively, all P<0.05). In paired comparisons, AZT+ 3TC+ LPV/r group displayed higher frequencies of E35D, M36I, and D60E mutations, the AZT+ 3TC+ EFV group showed a higher frequency of S48T mutation, the AZT+ 3TC+ NVP group showed a higher frequency of K122E mutation, and the TDF+ 3TC+ EFV group exhibited a higher frequency of R211K mutation, all with statistically significant differences (all P<0.008). The differences in the frequencies of T12S, I15V, L19I, M36I, V77I, L89M in the PR region and E53D, I135V, S162C, R211K, K277R in the RT region among circulating recombinant form (CRF)08_BC, CRF07_BC and CRF01_AE subtype group were statistically significant ( χ2=693.60, 712.51, 798.11, 434.85, 386.91, 657.78, 932.58, 409.21, 344.39, 469.44 and 260.48, respectively, all P<0.001). In paired comparisons, the frequencies of T12S, I15V, L19I, E53D, I135V, S162C and R211K in CRF08_BC subtype, the frequencies of V77I and K277R in CRF07_BC subtype, and the frequencies of M36I and L89M in CRF01_AE subtype were higher than those in the other two groups, and the differences were all statistically significant (all P<0.017). Conclusions:The polymorphic loci resulting from HIV-1 HAART failure show different distribution patterns across various degrees of drug resistance, treatment regimens and HIV-1 subtypes.These loci demonstrate both specific and shared characteristics. It is necessary to enhance the surveillance of select polymorphic loci.

Objective:To explore the capability of vascular endothelial growth factor receptor 2 (VEGFR2)/integrinα vβ 3 dual-targeted microbubbles in assessing the expression level of pro-angiogenic factors during renal cell carcinoma (RCC) growth. Methods:VEGFR2/integrinα vβ 3 dual-targeted microbubbles were prepared by using biotin-avidin linkage method. Twenty subcutaneous RCC xenografts in nude mice were established by subcutaneously injecting 786-O cells and then divided into 2 groups randomly. The targeted contrast-enhanced ultrasound (t-CEUS) examination was performed for all 10 mice in the first group when xenograft tumors were metered from 5 to 10 mm and >10 to 20 mm respectively. And the quantitative parameters of RCC on t-CEUS were longitudinally evaluated during tumor growth. The second group were divided into two subgroups according to xenograft tumors′ diameter, which was 5 to 10 mm and >10 to 20 mm respectively, and underwent t-CEUS examination. Quantitative analysis was performed for all t-CEUS images to obtain the targeted quantitative parameters, which including peak intensity (PI), area under the time-intensity curve (AUC), the differential tissue enhancement (dTE, presenting the difference in PI before (P 1) and after (P 2) the process of Flash). All xenograft tumors in the second group were harvested for immunohistochemical staining to observe the expression of VEGFR2, integrinα vβ 3 and CD31, and their differences in RCC with different tumor sizes. And the correlations between quantitative parameters and VEGFR2, integrinα vβ 3 and CD31 were analyzed. Results:The longitudinal comparison showed that there were statistically significant differences between AUC and dTE of RCC with different tumor sizes (all P<0.001). The larger the tumor size, the smaller the parameters were. According to the horizontal comparison, the expression levels of VEGFR2 and integrinα vβ 3 in larger RCCs were higher than those of RCCs with smaller size (both P<0.05), but there was no significant difference in CD31 expression between the two subgroups ( P=0.754). Both the targeted quantitative parameters (AUC anddTE ) and pro-angiogenic factors (VEGFR2 and integrinα vβ 3) were negatively correlated with tumor size ( rs=-0.83, -0.81, -0.70, -0.88; all P<0.05). Further more, there were good positive correlations between AUC and VEGFR2, integrinαvβ ( rs=0.76, 0.72; all P<0.05). There were good positive correlations between dTE and VEGFR2, integrinα vβ 3 ( rs=0.81, 0.70; all P<0.05). Additionally, the parameter PI was positively correlated with the expression of CD31 ( rs=0.70, P=0.025). Conclusions:The t-CEUS, mediated by VEGFR/integrinα vβ 3 dual-targeted microbubbles, allows noninvasive assessment of the expression levels of VEGFR2 and integrinα vβ 3 in RCCs, which decrease gradually with the increase of tumor size.

Objective:To evaluate the ability of vascular endothelial growth factor receptor 2(VEGFR2)/integrin α vβ 3 dual-targeted microubble (MBD) to target angiogenesis of renal cell carcinoma (RCC) in vivo. Methods:Non-targeted microbubble (MBN) USphere LA was employed as a template to prepare single- and dual-targeted microbubbles which could bind VEGFR2 and/or integrin α vβ 3 (MBV and MBI) by the biotin-avidin bridging method. A total of 40 RCC nude mice models were established by subcutaneously injecting 786-O cells.Twenty of the models were all injected with MBN, MBV, MBI and MBD in a random order, and the other 20 models were registered for antibody blocking assays. The results of ultrasound images were used for quantitative analyses, and the following quantitative parameters were obtained: intensity increment (a 1), peak halving speed (a 2), curve rising slope (a 3), perfusion time (t 0), time to peak (TTP), peak intensity (PI), mean transit time (MTT) and area under the curve (AUC) for the first three minutes, peak intensity at 10 s before (P 1) and after (P 2) ultrasound destruction, and the differences of tissue enhancement (dTE) between P 1 and P 2 (dTE=P 1-P 2). All the quantitative parameters of four contrast agents and the antibody blocking assays were compared.Besides, the immunohistochemical assays were performed to evaluate the expression of CD31, VEGFR2 and integrin α vβ 3 in tumor tissues. Results:The differences of parameters of a 1, a 3, t 0, TTP, PI and P 2 among four different microbubbles had no statistical significances (all P>0.05), and all parameters between the two single-targeted contrast agents were not statistically different (all P>0.05). The parameters of AUC, MTT, P 1 and dTE all showed a trend that dual-targeted bubbles > single-targeted bubbles > non-targeted bubbles (all P<0.05). On the contrary, the trend of dual-targeted bubbles < single-targeted bubbles < non-targeted bubbles (all P<0.05) was observed for a 2. In the antibody blocking experiment, a 2 was faster after the antibody injection ( P<0.001), while AUC, MTT, P 1 and dTE were all lower than those before the antibody injection ( P<0.001), and the other parameters were not statistically different before and after the antibody injection (all P>0.05). Immunohistochemical analyses confirmed the high expression of CD31, VEGFR2 and integrin β 3 in tumor tissues. Conclusions:The VEGFR2 and integrin α vβ 3 dual-targeted microbubble has a good potential to target the angiogenesis of human RCC in vivo.

Objective:To investigate the clinical feasibility of three-dimensional contrast-enhanced ultrasound (3D-CEUS) in the quantitative assessment of blood perfusion of hepatocellular carcinoma (HCC).Methods:Between January 2020 and August 2021, 36 HCC patients (39 lesions in total) confirmed by pathology and clinical diagnosis without any treatment from Zhongshan Hospital, Fudan University were enrolled and underwent both 2D-CEUS and 3D-CEUS examinations. Each examination last for 150 s and all images were recorded, and then the data were analyzed. A region of interest was manually drawn along the margin of the whole tumor and then the time-intensity curve (TIC) generated. The following perfusion parameters were extracted: peak intensity (PI), peak time (TTP), ascending slope (AS), mean transit time (MTT) and area under the curve (AUC). After calculating the quality of fit (QOF) of the curve, the intraobserver agreement of the 3D-CEUS quantitative parameters obtained by the same doctor between two times were assessed, and the consistency of the 3D-CEUS and 2D-CEUS quantitative parameters was evaluated when QOF>75%. The differences of the quantitative parameters between different groups (divided by depth of 8 cm and necrosis rate of 50%, respectively) in 3D-CEUS were compared.Results:There were 38 lesions (97.4%, 38/39) with QOF>75% in 3D-CEUS. The intraobserver agreement was excellent, the intraclass correlation efficient(ICC) values was 0.85-0.99. The consistency of the time quantitative parameters (TTP and MTT) were high (the ICC values of 0.87 and 0.91), and the correlation of intensity quantitative parameters were substantial, the rs values were 0.71, 0.72 and 0.71. The differences in 3D-CEUS quantitative parameters of the two groups of lesions with different depths were statistically significant (all P<0.05); but there were no significant differences in quantitative parameters between the two groups with different necrosis rate (all P>0.05). Conclusions:Quantitative 3D-CEUS is an useful and creditable tool in evaluating the blood perfusion of HCC, especially when the depth of lesion was less than 8 cm.

Objective:To investigate the value of contrast-enhanced ultrasonography (CEUS) in detecting minute renal cell carcinoma (MRCC) smaller than 15 mm (by ultrasonic measurement) and the strategy to improve its detection rate.Methods:Fifty-three pathologically confirmed MRCCs by surgery from November 2007 to October 2019 at Zhongshan Hospital of Fudan University were enrolled in this retrospectively study. All of them underwent both conventional ultrasound and CEUS examinations. The clinical and imaging data were collected and analyzed. Common features, such as tumor size, location, echogenicity, morphology, border, and blood flow signals were observed on conventional ultrasound. On CEUS, the presence of enhancement, wash in and wash out pattern, perfusion uniformity within the lesions were observed.Results:Post-operative pathology confirmed 48 clear cell carcinomas, 4 papillary carcinomas, and 1 chromophobe cell carcinoma. On conventional ultrasound, 12/53 lesions showed no protrusion out of the kidney, and 41/53 cases slightly protruded out of the kidney. There was considerable difficulty in the detection of ten lesions, which was achieved with the guidance of CT/MRI, due to their dorsal location of the kidney. On conventional ultrasound, solid, hyper-echoic, color flow signal with varying degrees were the main features of MRCC.The boundary could be well- or ill-defined, and cystic changes existed in part of cases. On CEUS, most MRCCs showed simultaneous enhancement in cortical phase, iso- to hyper-enhancement at peak, and rapid washout in parenchymal phase. The comparisons of imaging features demonstrated that the characteristics were significantly different between conventional ultrasound and CEUS with regard to boundaries, blood supply, and perfusion uniformity (χ 2=12.425, 20.247, 7.185; all P<0.01). Conclusions:CEUS can significantly improve the detection rate of MRCC, which is superior to conventional ultrasound.

Objective:To explore the value of contrast-enhanced ultrasound(CEUS) in distinguishing of renal oncocytoma(RO) and chromophobe renal cell carcinoma(chRCC).Methods:The ultrasonic image features of 49 ROs and 72 chRCCs between October 2007 and January 2020 were retrospectively analyzed, all lesions underwent ultrasonic examination (including 19 ROs and 70 chRCCs with CEUS imaging) and were pathologically approved in our institution. The statistically significant parameters from univariate analyses were then entered for further multivariable Logistic regression. The value of each ultrasonic imaging feature in differentiating RO and chRCC was evaluated.Results:According to the univariate analyses, all imaging features on conventional ultrasound were not statistically different between RO and chRCC (all P>0.05), while the characteristics of tumor wash-in/out pattern, enhancement degree and homogeneity at peak time and pseudocapsule around tumor were significantly different (all P<0.05). After multivariable analyses, tumor wash-in and wash-out pattern were excluded for tumor differentiation ( P>0.05), and the parameters of enhancement degree or homogeneity at peak time and pseudocapsule around tumor were still significantly different between tumor types (all P<0.05, odd ratio was 8.683, 6.667 and 18.774 respectively). The overall sensitivity, specificity and accuracy of these three parameters in diagnosing RO was 68.4%, 91.4% and 86.5%, respectively. Conclusions:CEUS can provide some useful information for the differentiation of RO and chRCC.

Objective: To investigate the value of contrast-enhanced ultrasound(CEUS) in differential diagnosis of complex renal cysts and clear renal cell carcinoma with cystic change(CRCCC). Methods: The ultrasonographic datas of 82 lesions in 82 patients with complicated renal cysts or CRCCC confirmed by pathology were analyzed. The characteristics of conventional ultrasound and CEUS were observed and evaluated. The lesions were graded according to Bosniak classification criteria. Results: Pathological examination showed that 36 cases were complicated renal cysts and 46 cases were CRCCC. Routine ultrasound showed there were 9 cases (25.0%) with cystic masses and 27 cases (75.0%) with solid and cystic masses in complex renal cysts, of which 14 cases (38.9%) could detect color flow signals. In CRCCC, 2 cases (4.3%) were with cystic masses and 44 cases (95.7%) were with solid and cystic masses, of which 33 cases (75.0%) could detect color flow signals. CEUS showed that only 18 cases (50.0%) of the complex renal cysts showed enhancement of cystic wall or septum, with equal or low enhancement at the peak, 9 cases (50.0%) accompanied by decrease of renal cortex, 35 cases (97.2%) had thin and regular cystic wall, no enhancement of cystic wall in all lesions, and 33 cases (91.7%) had septal thickness less than 1 mm. Forty-five cases (97.8%) of CRCCC showed enhancement of cystic wall or septum, 40 cases (88.9%) showed equal or high enhancement at peak, 30 cases (66.7%) were faster than the decrease of renal cortex, 37 cases (80.4%) showed uneven thickness of cystic wall, 24 cases (52.2%) showed enhancement of cystic wall nodules, and 28 cases (60.9%) showed uneven thickness of septum. After CEUS, 33 cases (91.7%) of complex renal cysts were classified as grade Ⅰ and Ⅱ, while 42 cases (91.3%) of CRCCC were classified as grade Ⅲ and Ⅳ. Conclusions The CEUS manifestations of complex renal cysts are different from those of CRCCC. The application of Bosniak criteria in CEUS is helpful for the differential diagnosis of complex renal cysts and CRCCC.

Objective To investigate the influence factors of mortality among human immunodeficiency virus (HIV)-infected children under highly active antiretroviral therapy (HAART).Methods Retrospective cohort study of 652 children initiated HAART from 2005 to 2014 was conducted,and enrolled patients were followed-up until December,2015.Survival data was analyzed using Kaplan-Meier method and Cox regression model was used to identify independent predictors of mortality among these children on HARRT.Chi-square test and Fisher's exact test were used for comparison between groups.Results Overall,26 of the children died over a follow-up period of 3 116.24 child-years,with a mortality rate of 0.83 per 100 child-years.Twelve (46％)of deaths occurred during the first six months after starting HAART.Cox regression analysis of variables showed that the World Health Organization (WHO) clinical stages Ⅲ/Ⅳ (hazard rate [HR] =10.717,95％confidence interal [95％ CI]:4.189-4.749,P =0.000),baseline hemoglobin ＜ 80 g/L (HR =14.768,95 ％ CI:5.721-38.125,P =0.000),tuberculosis co-infection (HR =4.794,95％ CI:2.105-10.918,P =0.000),baseline CD4+T lymphocyte ＜ 50 cells/μL (HR =4.219,95％ CI:1.524-11.680,P =0.006),weight-for-age z-score ＜-2 (HR =2.983,95 ％ CI:1.094-8.135,P =0.033) were independently associated with death,whereas the age ＜ 7 year-old at HAART initiation was protectire (HR =0.293,95％ CI:0.126-0.684,P =0.005).Conclusions The mortality of children receiving HAART is strongly associated with WHO stages Ⅲ/Ⅳ,hemoglobin ＜ 80 g/L,weight-for-age z-score ＜-2,tuberculosis co-infection and older age at treatment.

Objective To prepare the vascular endothelial grow th factor receptor 2 ( VEGFR2 )/Integrinαv β3 dual‐targeted contrast ultrasound agent ,and further evaluating the physical properties ,imaging characteristics and targeted ability in v itro . Methods VEGFR2 targeted microbubble ( MBV ) ,Integrinαv β3 targeted microbubble ( MBI) and VEGFR2/Integrinαv β3 dual targeted microbubble ( MBD) were prepared by attaching VEGFR2 antibody ,Integrinαv β3 antibody and both of VEGFR2/Integrinαv β3 antibody with no targeted USphere LA respectively , using biotin‐avidin linkage method . USphere LA with no antibody attached were used as non‐targeted microbubble( MBN ) . M icrobubble′s physical properties were observed , and its stability was detected by caculating bubble′s concentration at different time points . MBD′s ultrasound imaging characteristics were evaluated by comparing its grey level of ultrasound imaging with SonoVue at the time of preparation and 3 days after preparation . To detect the targeted ability of microbubble ,different types of microbubble were added into Hepa 1‐6 and C3H10 cells ,respectively . T he above procedure was repeated using the pre‐antibody blocking test in Hepa 1‐6 cell . Results MBD had a mean size of 1 256 nm .T he concentration of microbubble in the first duration of three days was declining slowly ,and its speed was accelerated after five days of preparation . T he grey level of new prepared MBD was similar to that of SonoVue in the same concentration ( P ＝0 .113) ,while the level was higher than that of SonoVue within 3 days after preparation( P ＜0 .001) . T he number of microbubble binding to Hepea1‐6 led a tendency of MBD＞ single targeted microbubble ＞ MBN ( all P ＜0 .05 ) . T he number of C3H10 and pre‐blocked Hepa1‐6 cell attached to each group of microbubble had no statistical difference ( all P ＞0 .05) . In addition ,following the pre‐blocked precedure ,the number of Hepa 1‐6 cell attached to each group of microbubble had no statistical difference either ( all P ＞ 0 .05 ) . Conclusions VEGFR2/Integrinαv β3 dual‐targeted contrast ultrasound agent is a stable microbubble and it has excellent ultrasound imaging and targeting ability in v itro .

Objective To compare the efficiencies of handheld ultrasound ,automated breast volume scanner ( ABVS) and breast specific gamma imaging (BSGI) in the diagnosis of breast cancer . Methods A retrospective review was performed in 200 women ( 210 breast lesions) underwent handheld ultrasound , ABVS and BSGI before surgery . The results were verified with histological examination . Results There was no obvious difference among the three methods in the sensitivity for the diagnosis of breast cancer( P >0 .05) . There was no difference of specificity between handheld ultrasound and ABVS ,BSGI( P = 0 .393 , 0 .139) . Compared with BSGI ,ABVS was an imaging modality with highest specificity for the diagnosis of breast cancer( P = 0 .021) ,and there was no difference between handheld ultrasound and ABVS ,BSGI ( P =0 .07 ,0 .29) . The areas under the ROC curve of handheld ultrasound ,ABVS and BSGI were 0 .855 ,0 .894 and 0 .818 ,respectively . The difference was obvious between ABVS and BSGI ( P = 0 .02) . Conclusions The diagnostic efficacy of ABVS in diagnosis of breast malignant lesions is similar to that of handheld ultrasound . BSGI has certain clinical value in the diagnosis of breast cancer ,and it is an effective supplement for breast cancer ultrasound examination .