ObjectiveTo investigate the ability of clinically isolated， Helicobacter pylori （H. pylori）-specific gene polymerase chain reaction （PCR）-positive gastric， vaginal， and fecal Candida to release H. pylori. MethodsResuscitate 4 strains of H. pylori -specific 16S rDNA and ureA gene PCR-positive Candida strains isolated in laboratory from clinical sources， including 1 strain of gastric Candida， 1 strain of fecal Candida， 2 strains of vaginal Candida and the standard Candida albicans strain ATCC10231 （Ca10231）. The presence of H. pylori-specific ureA in the 5 strains of Candida isolates was confirmed by PCR. The aforementioned strains of Candida and H.pylori were inoculated into urea medium and cultured in a constant temperature incubator at 37 ℃. The color change of the medium was observed daily. A change in the medium's color from yellow to red indicated the presence of urease activity. Then， the five strains of Candida and H. pylori were co-incubated with the magnetic beads coated with H. pylori antibodies respectively. Scanning electron microscopy （SEM） was employed to observe the presence of bacilli adsorbed on the surface of the magnetic beads. PCR was used to detect the presence of H.pylori-specific 16S rDNA and ureA genes on magnetic beads. ResultsThe PCR analysis of the ureA gene in the four Candida isolates was positive， whereas the Ca10231 strain tested negative. Upon culturing the four Candida isolates on urea medium， the medium color changed from yellow to red which was determined to be urease positive， while the medium containing Ca10231 remained unchanged， which was urease negative. SEM revealed that bacilli could be observed on the surface of magnetic beads co-incubated with the 4 strains of Candida of clinical origin and H.pylori isolate. Specifically， PCR testing of the magnetic beads co-incubated with one vaginal Candida， one gastric Candida and H.pylori isolate showed positive results for the 16S rDNA and ureA genes of H. pylori； however， the PCR tests for the two genes were negative for the magnetic beads co-incubated with the other two Candida isolate. ConclusionThis study demonstrates that H. pylori-specific genes Candida can release H. pylori.

Objective:To investigate the selection of treatment methods for renal tumors in pilots as well as the clinical significance of robot-assisted surgery by summarizing the process of robot-assisted surgery in the treatment of renal cell carcinoma in a pilot.Methods:The diagnosis, robot-assisted surgery and aeromedical assessment of a pilot with renal cell carcinoma were reported, and the related literature was reviewed.Results:The patient was a 44-year-old male transporter pilot, who was diagnosed with a left renal mass in the middle-lower pole of the kidney during a routine abdominal CT scan. After detailed preoperative evaluation that ruled out the possibility of distant metastasis and other surgical contraindications, the patient underwent robot-assisted laparoscopic partial nephrectomy in August 2022. The postoperative recovery went well, and renal function remained within normal limits at follow-ups. In March 2023, the pilot was concluded as qualified for flight after aeromedical assessment.Conclusions:Robot-assisted partial nephrectomy can significantly reduce surgical trauma, lower the risk of complications, and maximally preserve renal function. It is a good approach to renal tumors in pilots who can recover quickly.

Objective:To evaluate alterations in dopaminergic neurons, cortical metabolism, and functional connectivity networks in patients with early-onset Parkinson′s disease (EOPD) using multimodal neuroimaging.Methods:In this prospective cross-sectional study, 26 patients with EOPD and 16 healthy controls (HC group) were recruited from the PLA General Hospital between April and November 2023. All participants underwent integrated 11C-β-CFT PET/MR, 18F-FDG PET/CT brain imaging and resting-state functional MRI. Clinical assessments were conducted using the Unified Parkinson′s Disease Rating Scale and Hoehn-Yahr staging. Cognitive status was evaluated using the Mini-Mental State Examination and Montreal Cognitive Assessment. Standardized uptake value ratios for both 11C-β-CFT and 18F-FDG PET images were calculated using cerebellar gray matter as the reference region. Voxel-wise two-sample t-tests were performed to identify regions with significant group differences in tracer uptake. Seed regions showing altered 11C-β-CFT or 18F-FDG uptake were used to compute seed-based functional connectivity (FC) with all other brain voxels, and group differences in FC were assessed. Correlations between imaging metrics and clinical scales were evaluated using Pearson or Spearman analyses as appropriate. Results:Compared with HC group, EOPD group showed significantly reduced 11C-β-CFT uptake in the bilateral putamen, globus pallidus, and left temporal pole ( P<0.05), and decreased 18F-FDG uptake in the right superior frontal gyrus and anterior cingulate cortex ( P<0.05). Relative to HC group, EOPD group exhibited markedly lower FC between the right putamen and the left gyrus rectus as well as the right parahippocampal gyrus; the right superior frontal gyrus and the left gyrus rectus; the anterior cingulate cortex and the olfactory area of the frontal lobe, the left gyrus rectus, and the right superior parietal gyrus; the left temporal pole and the left orbitofrontal cortex as well as the left olfactory area ( P<0.05). Correlation analyses revealed no statistically significant associations between altered FC values and clinical scale scores in the EOPD group. Conclusions:Patients with EOPD demonstrate impaired nigrostriatal dopaminergic function, regional cortical hypometabolism, and aberrant functional connectivity across multiple brain networks.

Objective:To analyze the differentially diagnostic ability of metabolic parameters of 18F-fluorodeoxyglucose positron-emission tomography/computed tomography(18F-FDG PET/CT)in thymic epithelial tumors(TETs)of different histological types.Methods:A total of 72 patients who underwent 18F-FDG PET/CT examination and were confirmed as TETs before treatment at the Department of Nuclear Medicine of the First Medical Center of Chinese PLA General Hospital between January 2013 to May 2022 were analyzed.The patients were divided into thymic tumor with low risk group(9 cases),thymic tumor with high risk group(15 cases)and thymic cancer group(9 cases)according to histological type.The clinical data of patients were recorded,and the patients were staged according to pathological Masaoka-Koga staging of thymic tumor surgery.The maximum standardized uptake value(SUVmax),average standardized uptake value(SUVmean),metabolic tumor volume(MTV),total lesion glycolysis(TLG)and standardized uptake value ratio(SUVR)of the lesions were recorded respectively.The differences of metabolic parameters of various group were compared.The area under curve(AUC)value of receiver operating characteristic(ROC)curve was used to analyze the diagnostic efficacy of 18F-FDG PET/CT in TETs of different histological types.Results:The results of analyzing each metabolic parameter of three groups indicated that the SUVmax,SUVmean and SUVR values of thymic tumor with high risk group and thymic cancer group were significantly higher than them of thymic tumor with low risk group,and the differences were significant(F=10.315,8.336,11.593,P<0.05),respectively.SUVR has the highest diagnostic efficacy in the differential diagnosis for thymic tumor and thymic cancer(AUC:0.864,sensitivity:83.3%,specificity:75.0%),and for thymic tumor with high-risk and thymic cancer(AUC:0.832,sensitivity:56.3%,specificity:100.0%).In addition,SUVR has the highest diagnostic efficacy for thymic tumor with high-risk and thymic tumor with low-risk(AUC:0.748,sensitivity:80.0%,specificity:66.7%).Conclusion:The metabolic parameters of 18F-FDG PET/CT have a certain of differential and diagnostic value in identifying TETs of different histological types.

Objective:To evaluate alterations in dopaminergic neurons, cortical metabolism, and functional connectivity networks in patients with early-onset Parkinson′s disease (EOPD) using multimodal neuroimaging.Methods:In this prospective cross-sectional study, 26 patients with EOPD and 16 healthy controls (HC group) were recruited from the PLA General Hospital between April and November 2023. All participants underwent integrated 11C-β-CFT PET/MR, 18F-FDG PET/CT brain imaging and resting-state functional MRI. Clinical assessments were conducted using the Unified Parkinson′s Disease Rating Scale and Hoehn-Yahr staging. Cognitive status was evaluated using the Mini-Mental State Examination and Montreal Cognitive Assessment. Standardized uptake value ratios for both 11C-β-CFT and 18F-FDG PET images were calculated using cerebellar gray matter as the reference region. Voxel-wise two-sample t-tests were performed to identify regions with significant group differences in tracer uptake. Seed regions showing altered 11C-β-CFT or 18F-FDG uptake were used to compute seed-based functional connectivity (FC) with all other brain voxels, and group differences in FC were assessed. Correlations between imaging metrics and clinical scales were evaluated using Pearson or Spearman analyses as appropriate. Results:Compared with HC group, EOPD group showed significantly reduced 11C-β-CFT uptake in the bilateral putamen, globus pallidus, and left temporal pole ( P<0.05), and decreased 18F-FDG uptake in the right superior frontal gyrus and anterior cingulate cortex ( P<0.05). Relative to HC group, EOPD group exhibited markedly lower FC between the right putamen and the left gyrus rectus as well as the right parahippocampal gyrus; the right superior frontal gyrus and the left gyrus rectus; the anterior cingulate cortex and the olfactory area of the frontal lobe, the left gyrus rectus, and the right superior parietal gyrus; the left temporal pole and the left orbitofrontal cortex as well as the left olfactory area ( P<0.05). Correlation analyses revealed no statistically significant associations between altered FC values and clinical scale scores in the EOPD group. Conclusions:Patients with EOPD demonstrate impaired nigrostriatal dopaminergic function, regional cortical hypometabolism, and aberrant functional connectivity across multiple brain networks.

Objective:To analyze the differentially diagnostic ability of metabolic parameters of 18F-fluorodeoxyglucose positron-emission tomography/computed tomography(18F-FDG PET/CT)in thymic epithelial tumors(TETs)of different histological types.Methods:A total of 72 patients who underwent 18F-FDG PET/CT examination and were confirmed as TETs before treatment at the Department of Nuclear Medicine of the First Medical Center of Chinese PLA General Hospital between January 2013 to May 2022 were analyzed.The patients were divided into thymic tumor with low risk group(9 cases),thymic tumor with high risk group(15 cases)and thymic cancer group(9 cases)according to histological type.The clinical data of patients were recorded,and the patients were staged according to pathological Masaoka-Koga staging of thymic tumor surgery.The maximum standardized uptake value(SUVmax),average standardized uptake value(SUVmean),metabolic tumor volume(MTV),total lesion glycolysis(TLG)and standardized uptake value ratio(SUVR)of the lesions were recorded respectively.The differences of metabolic parameters of various group were compared.The area under curve(AUC)value of receiver operating characteristic(ROC)curve was used to analyze the diagnostic efficacy of 18F-FDG PET/CT in TETs of different histological types.Results:The results of analyzing each metabolic parameter of three groups indicated that the SUVmax,SUVmean and SUVR values of thymic tumor with high risk group and thymic cancer group were significantly higher than them of thymic tumor with low risk group,and the differences were significant(F=10.315,8.336,11.593,P<0.05),respectively.SUVR has the highest diagnostic efficacy in the differential diagnosis for thymic tumor and thymic cancer(AUC:0.864,sensitivity:83.3%,specificity:75.0%),and for thymic tumor with high-risk and thymic cancer(AUC:0.832,sensitivity:56.3%,specificity:100.0%).In addition,SUVR has the highest diagnostic efficacy for thymic tumor with high-risk and thymic tumor with low-risk(AUC:0.748,sensitivity:80.0%,specificity:66.7%).Conclusion:The metabolic parameters of 18F-FDG PET/CT have a certain of differential and diagnostic value in identifying TETs of different histological types.

Objective:To investigate the selection of treatment methods for renal tumors in pilots as well as the clinical significance of robot-assisted surgery by summarizing the process of robot-assisted surgery in the treatment of renal cell carcinoma in a pilot.Methods:The diagnosis, robot-assisted surgery and aeromedical assessment of a pilot with renal cell carcinoma were reported, and the related literature was reviewed.Results:The patient was a 44-year-old male transporter pilot, who was diagnosed with a left renal mass in the middle-lower pole of the kidney during a routine abdominal CT scan. After detailed preoperative evaluation that ruled out the possibility of distant metastasis and other surgical contraindications, the patient underwent robot-assisted laparoscopic partial nephrectomy in August 2022. The postoperative recovery went well, and renal function remained within normal limits at follow-ups. In March 2023, the pilot was concluded as qualified for flight after aeromedical assessment.Conclusions:Robot-assisted partial nephrectomy can significantly reduce surgical trauma, lower the risk of complications, and maximally preserve renal function. It is a good approach to renal tumors in pilots who can recover quickly.

Purpose To investigate the predictive value of 18F-FDG PET/CT radiomic features before treatment for progression free survival(PFS)and overall survival(OS)in diffuse large B-cell lymphoma(DLBCL).Materials and Methods A total of 135 patients with pathologically proven DLBCL in Chinese PLA General Hospital from January 2016 to December 2018 and 18F-FDG PET/CT imaging prior to treatment were retrospectively collected.Patients were randomly divided into training set and test set using 8∶2,and then the training set was divided into training set and verification set using 8∶2 to construct the model.Semi-automatically delineated patients'lymphoma lesions as regions of interest and extracted the features.Univariate COX and least absolute shrinkage and selection operator regression were used to screen the features,and the non-zero radiomic features were obtained and the weight coefficients were used to calculate the Radscore value of each patient,and the predictive value of Radscore on PFS and OS was analyzed.Three models were established using traditional prognostic indicators(metabolic parameters and clinical factors),Radscore and combination.C-index,time-dependent area under the curve and decision curve were used to evaluate the model prediction efficiency.Finally,based on the optimal model,a column diagram was drawn,and the calibration curve was used to verify the efficiency of the column diagram.Results The combined model predicted PFS and OS at 3 and 5 years better than the traditional prognostic index model and Radscore model(Z=0.962 1-2.253 9,all P<0.05).Decision curve showed that the combined model achieved the greatest clinical net benefit.The calibration curve showed that the predicted values of the nomogram were in good agreement with the observed values.Conclusion Radscore is an independent prognostic factor for survival in DLBCL patients.The combined model has great application value in guiding the formulation of clinical individualized treatment plan.

Objective:To investigate the effect of different acquisition duration of brain image of 18F-florbetaben(18F-FBB)positron emission tomography(PET)on standardized uptake value(SUV).Methods:Eight subjects who underwent 18F-FBB PET examination in Chinese PLA General Hospital from May 2021 to June 2021 were selected,including 5 persons of healthy control and 3 patients with mild cognitive impairment(MCI).All subjects underwent 18F-FBB PET imaging,and the dynamic PET images of them on brains were continuously acquired for 20 min between 90 and 110 min after the 18F-FBB injection was injected as(3.7-5.5 MBq/kg).Under the situation that other reconstruction parameters did not change,the images were reconstructed at 0-1,0-3,0-5,0-10,0-15 and 0-20 min,respectively.The same of region of interest(ROI)ranges were delineated in bilateral frontal cortex,bilateral temporal cortex,bilateral parietal cortex,posterior cingulate gyrus and cerebellar cortex of each group of images.And then,the corresponding mean standardized uptake value(SUVmean)of each region was obtained.The differences of SUVmean values of different ROI values between each group of data images and the images of 0-20 min were compared and analyzed.Results:There were significant differences in SUVmean between the acquired images in 0-1,0-3,0-5 and 0-10 min and the acquired standard images of 0-20 min(t=-7.569--2.410,P<0.05),respectively.There were no significant differences in SUVmean between the acquired images of 0-15 min and the acquired standard images of 0-20 min in the bilateral frontal lobe,bilateral temporal lobe,bilateral parietal cortex and posterior cingulate gyrus(P>0.05),only there was significant difference in the cerebellar cortex area between them(t=-5.597,P<0.001).Conclusion:The results of 15 min can reach to the similar results of 20 min in acquiring images,which can shorten the time of examination,and enhance the degrees of comfort and cooperation of patients in examination.It has clinical application value.

Objective:To evaluate the potential of 177Lu-prostate specific membrane antigen (PSMA)-3Q in the treatment of metastatic castration-resistant prostate cancer (mCRPC) and compare it with 177Lu-PSMA-I&T. Methods:177Lu-PSMA-3Q was prepared and the quality control and stability testing were performed. Pharmacokinetic evaluation and biodistribution of 177Lu-PSMA-3Q and 177Lu-PSMA-I&T were conducted in normal BALB/c mice and 22Rv1 tumor-bearing mice. SPECT imaging was performed on 2 patients (60 and 76 years old) with mCRPC from Chinese PLA General Hospital at 24, 72, and 120 h after injection of 177Lu-PSMA-3Q or 177Lu-PSMA-I&T ((7.40±0.74) GBq). Data were analyzed by using independent-sample t test. Results:177Lu-PSMA-3Q was prepared with the total activity of 74 GBq, the yield rate of 95% (uncorrected), and the radiochemical purity was still above 95% after 168 h at room temperature. The distribution half-lives of 177Lu-PSMA-3Q and 177Lu-PSMA-I&T were (0.75±0.22) and (0.86±0.19) min, and the clearance half-lives were (24.74±3.77) and (29.53±3.42) min. Biodistribution of normal mice showed that the uptake values in the liver, lungs, and kidneys 5 d after injection of 177Lu-PSMA-3Q were lower than those of 177Lu-PSMA-I&T ( t values: 4.24-8.36, all P<0.05). The tumor uptake of 177Lu-PSMA-3Q after 24 h injection was the highest and was higher than that of 177Lu-PSMA-I&T ((0.856±0.183) vs (0.579±0.126) percentage activity of injection dose per gram of tissue (%ID/g); t=2.78, P=0.024) in 22Rv1 tumor-bearing mice. The rapid clearance pattern resulted in a higher tumor/muscle (T/M) ratio for 177Lu-PSMA-3Q (99.604±11.106), which was significantly higher than that for 177Lu-PSMA-I&T (45.078±10.444; t=7.80, P<0.001). According to SPECT imaging of patients with mCRPC, the residual lesion counts of 177Lu-PSMA-3Q and 177Lu-PSMA-I&T at 120 h accounted for 0.32±0.05 and 0.58±0.04 of those at 24 h, with significant difference ( t=7.62, P=0.002). Conclusion:177Lu-PSMA-3Q is easy to label, and has high yield and radiochemical purity, good stability, excellent biological performance, good targeting ability in patients, longer retention time, and fast background clearance rate, which is an ideal prostate cancer treatment drug targeting PSMA.