Background Air pollution and meteorological factors exert complex nonlinear effects on acute symptoms in the population, with intricate interactions among these factors. Traditional statistical methods struggle to simultaneously address complex nonlinear relationships and multicollinearity issues. Objective To delineate the dynamic effects of air pollutants and meteorological parameters on acute symptoms in three distinct populations with the multicollinearity being addressed and to generate reliable scientific evidence for prevention and control of health risk factors. Methods A time-series study design was employed to collect data on air pollution (daily mean temperature, daily precipitation, daily mean relative humidity, and daily mean wind speed), meteorological factors [Air Quality Index (AQI), fine particulate matter (PM_2.5), inhalable particulate matter (PM₁₀), sulfur dioxide (SO₂), nitrogen dioxide (NO₂), carbon monoxide (CO), and 8-hour maximum ozone (O₃)], and acute symptoms such as fever, cough, and sore throat in Jinan from June to December 2023. Key variables were selected using least absolute shrinkage and selection operator (LASSO) regression, followed by generalized additive mixed modeling (GAMM) to analyze the health effects of combined environmental exposures to air pollution and meteorological factors. Linear variables were modeled using linear mixed-effects function, nonlinear variables were smoothed using thin-plate regression splines, and variables with interaction effects were smoothed using low-rank scale-invariant tensor product splines. Fluctuations in independent variables following a normal distribution were treated as sampling errors and incorporated as random effects in the GAMM. Results For fever, the daily mean temperature, daily mean relative humidity, daily mean wind speed, and ambient SO₂ were statistically significant (P<0.05), with daily mean wind speed being a linear influencing factor. When the daily mean temperature was below 3 °C, each 10 °C increase corresponded to a relative risk (RR) of 2.64 (95%CI: 2.50, 2.79). When the daily mean temperature was ≥3 °C, each 10 °C increase corresponded to an RR of 0.86 (95%CI: 0.83, 0.89). Each 10% increase in daily mean relative humidity was associated with an RR of 0.93 (95%CI: 0.89, 0.97). Each 1 m·s⁻¹ increase in daily mean wind speed corresponded to an RR of 1.06 (95%CI: 1.02, 1.10). Within the concentration ranges of <10 μg·m⁻³, 10–<12.5 μg·m⁻³, and ≥12.5 μg·m⁻³, each 1 μg·m⁻³ increase in ambient SO₂ corresponded to RR values of 1.01 (95%CI: 0.98, 1.05), 1.21 (95%CI: 1.17, 1.24), and 0.97 (95%CI: 0.94, 0.99), respectively. For cough, the daily mean temperature, daily mean relative humidity, PM₁₀, and SO₂ were statistically significant (P<0.001), with PM₁₀ being a linear influencing factor. When the daily mean temperature was below 1 °C, each 10 °C increase corresponded to an RR of 1.47 (95%CI: 1.42, 1.52). When the daily mean temperature was ≥1 °C, each 10 °C increase corresponded to an RR of 0.85 (95%CI: 0.82, 0.87). Each 10% increase in daily mean relative humidity was associated with an RR of 0.95 (95%CI: 0.92, 0.98). Each 50 μg·m⁻³ increase in PM₁₀ concentration corresponded to an RR of 1.05 (95%CI: 1.02, 1.08). Within the concentration ranges of <10 μg·m⁻³, 10–<12.5 μg·m⁻³, and ≥ 12.5 μg·m⁻³, each 1 μg·m⁻³ increase in ambient SO₂ corresponded to RR values of 1.00 (95%CI: 0.97, 1.03), 1.12 (95%CI: 1.09, 1.16), and 0.98 (95%CI: 0.95, 1.00), respectively. For sore throat, the daily mean temperature, daily mean relative humidity, daily mean wind speed, PM₁₀, and SO₂ were statistically significant (P<0.05), with daily mean wind speed and PM₁₀ being linear influencing factors. When the daily mean temperature was below 2 °C, each 10 °C increase corresponded to an RR of 1.82 (95%CI: 1.69, 1.96). When the daily mean temperature was ≥2 °C, each 10 °C increase corresponded to an RR of 0.81 (95%CI: 0.77, 0.87). Each 10% increase in daily mean relative humidity was associated with an RR of 0.94 (95%CI: 0.88, 1.00). Within the concentration ranges of <10 μg·m⁻³, 10–<12.5 μg·m⁻³, and ≥12.5 μg·m⁻³, each 1 μg·m⁻³ increase in ambient SO₂ corresponded to RR values of 1.02 (95%CI: 0.97, 1.08), 1.13 (95%CI: 1.08, 1.19), and 0.98 (95%CI: 0.94, 1.02), respectively. Each 1 m·s⁻¹ increase in daily mean wind speed and each 50 μg·m⁻³ increase in PM₁₀ concentration were associated with RR values of 1.06 (95%CI: 1.00, 1.12) and 1.04 (95%CI: 0.98, 1.10), respectively. An interaction effect was observed between daily mean wind speed and PM₁₀: increasing daily mean wind speed non-linearly reduced the impact of PM₁₀, on sore throat whereas PM₁₀ had no significant effect on wind speed. Conclusion This study, by combining LASSO and GAMM, largely eliminates the multicollinearity among selected variables. It reveals complex non-linear effects and interactions between air pollutants, meteorological factors, and acute symptoms in different population groups in Jinan. The symptoms like fever, cough, and sore throat are non-linearly associated with daily mean temperature and SO₂ concentration, while PM₁₀ and wind speed show a linear relationship or interactive effects. These findings provide a new basis for the precise prevention and control of health risk factors.

Objective To compare the clinical efficacy of three different therapies,including transjugular intrahepatic portosystemic shunt(TIPS)treatment,endoscopic treatment and medication treatment,combined with transhepatic arterial chemoembolization(TACE)in treating primary liver cancer complicated by portal hypertension and upper gastrointestinal bleeding.Methods A total of 105 patients with primary liver cancer associated with portal hypertension and upper gastrointestinal bleeding,who were admitted to the No.980 Hospital of PLA Joint Logistics Support Forces of China to receive treatment between January 2014 and June 2020,were enrolled in this study.According to the therapeutic scheme,the patients were divided into TIPS+TACE group(TIPS group,n=25),endoscopy+TACE group(endoscopy group,n=30),and medication+TACE group(medication group,n=50).The clinical efficacy,recurrence rate of bleeding,incidence of hepatic encephalopathy,and survival rate were compared between each other among the three groups.Results The differences in the postoperative 6-month,12-month and 24-month recurrence rates of bleeding between each other among the three groups were statistically significant(all P＜0.05).In TIPS group,the portal vein pressure decreased from preoperative(38.47±9.35)mmHg(1 mmHg=0.133 kPa)to postoperative(25.24±5.68)mmHg,the difference was statistically significant(P＜0.05).After treatment,the hemoglobin level in the three groups showed varying degrees of elevation,which in the TIPS group and endoscopy group were better than that in the medication group,the differences were statistically significant(P＜0.05).In all three groups,the differences in the recurrence rate of bleeding between postoperative 6-month value,12-month value and 24-month value were statistically significant(all P＜0.05).The postoperative 6-month,12-month and 24-month recurrence rates of bleeding in the TIPS group were lower than those in the endoscopy group and the medication group,and the differences were statistically significant(P＜0.05).The postoperative 12-month and 24-month recurrence rates of bleeding in the TIPS group were lower than those in the endoscopy group,and the differences were statistically significant(P＜0.05).The postoperative 12-month and 24-month recurrence rates of bleeding in the endoscopy group were lower than those in the medication group(P＜0.05),and the difference in the postoperative 6-month recurrence rate of bleeding between the two groups was not statistically significant(P＞0.05).The postoperative 6-month and 12-month incidences of hepatic encephalopathy in the TIPS group were higher than those in the endoscopy group and the medication group,the differences were statistically significant(P＜0.05),while the differences in the postoperative 6-month and 12-month incidences of hepatic encephalopathy between the endoscopy group and the medication group were not statistically significant(P＞0.05),and the differences in the postoperative 24-month incidence of hepatic encephalopathy between each other among the three groups were not statistically significant(P＞0.05).No statistically significant difference in the 6-month mortality existed between TIPS group and endoscopy group(P＞0.05),and the 6-month mortality of both TIPS group and endoscopy group was remarkably lower than that of the medication group(P＜0.05).The postoperative 12-month mortality and 24-month mortality in TIPS group were lower than those in the endoscopy group and the medication group,and the differences were statistically significant(P＜0.05),but the differences in the postoperative 12-month mortality and 24-month mortality between the endoscopy group and the medication group were not statistically significant(P＞0.05).Conclusion For primary liver cancer associated with portal hypertension and upper gastrointestinal bleeding,TIPS combined with TACE can effectively control tumor progression and prolong survival.(J Intervent Radiol,2024,32:33-37)

Objective:To compare and choose the best method for measuring metabolic tumor volume (MTV) of nasal extranodal natural killer/T-cell lymphoma (ENKTL), evaluate the prognostic value of 18F-FDG PET/CT metabolic parameters and clinical staging/scoring systems for patients with nasal ENKTL, and explore the added value of the two combinations for prognostic prediction. Methods:From January 2016 to September 2022, 44 patients (26 males, 18 females; age (47.5±13.6) years) pathologically diagnosed with nasal ENKTL who underwent 18F-FDG PET/CT imaging before treatment in Union Hospital, Tongji Medical College, Huazhong University of Science and Technology were retrospectively collected. SUV 2.5, SUV 4.0 and 41%SUV max were used as thresholds to measure MTV and total lesion glycolysis (TLG), and the consistency was analyzed by Bland-Altman analysis. The ROC curve analysis was used to compare the prognostic efficiency of different methods and determine the best method. The prognostic values of different clinical factors and clinical staging/scoring systems between groups were evaluated by corrected χ2 test. The independent factors were screened by Cox-regression model, and the combined diagnosis model was constructed by logistic regression. Results:Of 44 patients, 6(13.6%) were dead, with the overall survival (OS) of 32.05(11.77, 64.43) months, and the 2-year and 5-year OS rates of 86.6% and 82.5%, respectively. The mortality of different groups in age (≥60 and <60 years), prognostic index of natural killer cell lymphoma (PINK) score (low- and high-risk), and international prognostic index (IPI) score (low- and high-risk) were significantly different ( χ2 values: 5.02, 4.12, 3.88, all P<0.05). The consistency of MTV measured by different thresholds was good. Among them, the MTV measured by threshold of SUV 2.5 had the highest predictive efficiency with the AUC of 0.737. Multivariate analysis showed that MTV (hazard ratio ( HR)=10.488, 95% CI: 1.864-59.026, P=0.008) was the independent influencing factor of OS. By removing other factors, minimization model was obtained, including MTV and PINK score ( P values: 0.006, 0.048). The prediction model of MTV combined with PINK score improved prognostic efficacy with the AUCs of MTV, PINK score and the combination model of 0.781, 0.741 and 0.912, respectively. Conclusions:MTV measured by threshold of SUV 2.5 has better prognostic predictive value. MTV is the independent prognostic factor for OS in nasal ENKTL patients. MTV combined with PINK score has better prognostic value.

Objective:To compare the effects of transverse abdominis plane block and incision infiltration anesthesia on the early postoperative recovery in the patients undergoing thoracoscopic lung resection with general anesthesia.Methods:Eighty American Society of Anesthesiologists Physical Status classification Ⅱ or Ⅲ patients, regardless of gender, aged 50-78 yr, with body mass index of 18-30 kg/m 2, scheduled for elective thoracoscopic lung resection under general anesthesia, were divided into 2 groups ( n=40 each) using a random number table method: incision local infiltration group (group D) and transverse abdominis plane block group (group E). In group E, the patients were changed to the lateral position after completion of anesthesia induction, ultrasound-guided transverse abdominis plane block was performed on the affected side, with 0.25% ropivacaine hydrochloride 30 ml injected. In group D, infiltration anesthesia with 0.25% ropivacaine hydrochloride was performed before incision. Postoperative patient-controlled intravenous analgesia was carried out, and flurbiprofen axetil was intravenously injected for rescue analgesia when the numerical rating scale score at rest >3 or numerical rating scale score≥6 while coughing. Quality of Recovery-15 scale scores were assessed at 1 day before surgery and 24 and 48 h after surgery. Plasma concentrations of interleukin-6 (IL-6) and IL-1β were measured by enzyme-linked immunosorbent assay before incision, at the end of surgery, and at 24 h after surgery. The amount of remifentanil used during surgery, the number of effective pressing times of patient-controlled analgesia within 48 h after surgery, requirement for rescue analgesia, first ambulation time after surgery, time to first flatus, length of hospital stay, and occurrence of nausea and vomiting and pulmonary infection within 48 h after surgery were recorded. Results:Compared with group D, Quality of Recovery-15 scale scores were significantly increased, the amount of remifentanil used during surgery and the number of effective pressing times of patient-controlled analgesia were reduced, the rate of rescue analgesia was decreased, the time to first rescue analgesia was prolonged, and the time to first flatus was shortened in group E ( P<0.05). There were no significant differences in the plasma concentrations of IL-6 and IL-1β at various time points, time to first ambulation after surgery, length of hospital stay, and incidence of nausea and vomiting and pulmonary infection between the two groups ( P>0.05). Conclusions:Compared with incision infiltration anesthesia, transverse abdominis plane block can reduce intraoperative consumption of opioids, alleviate postoperative pain, and promote early postoperative recovery when used for thoracoscopic lung resection under general anesthesia.

Objective:To investigate the predictive values of 18F-FDG PET/CT image feature and metabolic parameters for the malignant potential of gastrointestinal stromal tumor (GIST). Methods:From March 2014 to June 2020, the 18F-FDG PET/CT imaging and surgical pathological data of 35 patients with GIST (27 males, 8 females; age 44-84 years) from Union Hospital, Tongji Medical College, Huazhong University of Science and Technology and Zhongnan Hospital of Wuhan University were analyzed retrospectively. Patients were divided into ring-shaped uptake group and other uptake patterns group according to 18F-FDG PET/CT image feature. Fisher′s exact test was used to analyze the differences of tumor necrosis and National Institutes of Health (NIH) risk classification (short for NIH classification) between different image feature groups. Mann-Whitney U test was used to analyze the differences of SUV max , metabolic parameters at different thresholds (2.5, 40%, 50%) of SUV max (metabolic tumor volume (MTV; MTV 2.5, MTV 40%, MTV 50%) and total lesion glycolysis (TLG; TLG 2.5, TLG 40%, TLG 50%)) between different clinicopathological features (lesion location, tumor diameter, mitotic count, Ki-67, necrosis, image feature, NIH classification) groups. Spearman rank correlation analysis was used to explore the correlation between clinicopathological features and metabolic parameters. ROC curve analysis was used to distinguish NIH classification of different metabolic parameters. Delong test was used to compared differences between different AUCs. Results:Of 35 GIST patients, 11(31.4%) were ring-shaped uptake and 24(68.6%) were other uptake patterns, and the differences of necrosis (7/11 vs 12.5%(3/24); P=0.004) and NIH classification (11/11 vs 25.0%(6/24); P<0.001) between the two groups were significant. There were significant differences of metabolic parameters between different groups of tumor diameter, mitotic count, necrosis, image feature, NIH classification ( z values: from -4.70 to -2.09, all P<0.05), while there were no significant differences of Ki-67 ( z values: from -0.83 to -0.71, all P>0.05). Metabolic parameters were correlated with mitotic count, tumor diameter, necrosis, image feature and NIH classification ( rs values: 0.36-0.81, all P<0.05), while was not correlated with Ki-67 ( rs values: 0.12-0.14, all P>0.05). The differences of AUCs between SUV max and MTV 2.5, TLG 2.5, TLG 40%, TLG 50%were significant (0.752, 0.856, 0.856, 0.882, 0.886; z values: 1.96-2.12, all P<0.05). Conclusions:The NIH classification of GIST with ring-shaped uptake on 18F-FDG PET/CT is higher and more prone to necrosis. The 18F-FDG PET/CT metabolic parameters based on different thresholds of SUV max have certain significance for the prediction of NIH classification of GIST, and may be superior to SUV max.

Objective:To analyze the factors influencing dysphagia after an injury to the cervical spinal cord (CPCI) to provide a basis for clinical screening and intervention.Methods:A total of 110 CPCI patients with dysphagia were divided into a severe dysphagia group ( n=19), a mild dysphagia group ( n=35), and a control group ( n=56) according to their functional oral intake scale scores. Data on gender, age, level of injury, degree of damage, duration of injury, causes of injury, surgical mode, tracheotomy status, occurrence of pneumonia and pharynx swelling were collected. Univariate and multivariate logistic regressions were evaluated to identify factors affecting swallowing. Results:The regressions highlighted age, the severity of the spinal cord injury, tracheotomy status, and the occurrence of pneumonia and pharyngeal swelling during hospitalization as the best predictors of swallowing difficulties. Multifactoral logistic regression analysis revealed that undergoing tracheotomy and catching pneumonia during hospitalization were major risk factors for severe dysphagia.Conclusions:Tracheotomy and pneumonia during hospitalization are useful predictors of severe dysphagia after a cervical spinal cord injury.

Objective To investigate the mechanism of action of Dingchuan granules in intervening respiratory syncytial virus pneumonia based on network pharmacology and animal experiments.Methods The potential active ingredients and targets of each traditional Chinese medicine in Dingchuan granules were obtained from TCMSP and TCMID databases,and the active ingredients of the drugs in Dingchuan granules were screened according to ADME pharmacokinetic parameters;the potential disease targets of respiratory syncytial virus pneumonia were obtained from Genecards,OMIM,and DisGeNet databases;the protein-interaction networks of intersecting targets were visualized by using String platform;the key core targets were visualized by using David database;and the intersection targets were visualized by using David database.Interaction networks were constructed using the String platform to visualize the intersecting targets;GO functional enrichment and KEGG pathway enrichment analyses of the key core targets were performed using the David database;and then the relevant networks for the intervention of Respiratory Syncytial Virus Pneumonia in the Dingchuan particles were constructed using the Cytoscape software(3.9.1).Respiratory syncytial virus(RSV)-induced respiratory syncytial virus pneumonia in young rats was selected for experimental validation.Results The results of the network pharmacology showed that the 177 potential active ingredients of Dingchuan granules acted on 144 targets,and there were 1075 targets related to respiratory syncytial virus pneumonia,and 55 drug-disease intersecting targets were obtained,of which 25 core targets were ALB,IL6,CASP3,EGFR,VEGFA,etc.The GO function of Dingchuan granules was also investigated,and the GO function of Dingchuan was investigated.The results of GO function enrichment analysis showed that the biological processes involved mainly include positive regulation of transcription,positive regulation of RNA polymerase II promoter transcription,positive regulation of gene expression,negative regulation of apoptosis,etc.The KEGG pathway enrichment mainly involves the PI3K-Akt signaling pathway,the cancer pathway,the tumor necrosis factor signaling pathway,the IL-17 signaling pathway and so on.The KEGG pathway enrichment mainly involves PI3K-Akt signaling pathway,tumor necrosis factor signaling pathway,IL-17 signaling pathway,etc.Animal experiments initially showed that the fixed wheezing granules can play a role in inflammation and immune response by regulating the PI3K-Akt signaling pathway,thus participating in the inflammatory and immune response.Compared with the normal group,the ratios of p-PI3K/PI3K and p-Akt/Akt in the lung tissues of young rats in the model group were significantly higher(P<0.05),the viral load was significantly higher(P<0.05),the pathological score of lung tissue damage was significantly higher(P<0.05),and the content of inflammatory factors IL-6 and TNF-α in alveolar lavage fluid(BALF)was significantly higher(P<0.05).Compared with the model group,the expression of p-PI3K/PI3K and p-Akt/Akt proteins in the lung tissues of young rats in each dose group and the positive control group was reduced(P<0.05),the viral load was significantly reduced(P<0.05),the pathological scores of lung tissue injury were significantly reduced(P<0.05),and the contents of inflammatory factors IL-6 and TNF-α in BALF were significantly reduced(P<0.05).Conclusion The study revealed the synergistic mechanism of multi-component,multi-target,and multi-pathway action of Dingchuan granules for the treatment of respiratory syncytial virus pneumonia.It was verified by animal experiments that RSV infection in young rats probably activated the PI3K-Akt signaling pathway,which caused the release of inflammatory factors IL-6 and TNF-α.Dingchuan granules could effectively down-regulate the PI3K-Akt signaling pathway,inhibit the release of inflammatory factors IL-6 and TNF-α,and thus achieve the anti-inflammatory effect.

Objective To observe the effectiveness and safety of Viatorr stent applicated in TIPS for treating primary hepatic carcinoma(PHC)complicated with liver cirrhosis and upper gastrointestinal hemorrhage.Methods Date of 20 PHC patients complicated with liver cirrhosis and upper gastrointestinal hemorrhage who underwent TIPS using Viatorr stent were retrospectively analyzed.The technical success rate of TIPS,clinical success rate,complications,recurrence of upper gastrointestinal hemorrhage and the patency of stent shunt 1,3,6 and 12 months after TIPS were recorded.Results TIPS was successfully completed in all 20 cases,and the technical success rate was 100%.The portal venous pressure was(37.58±7.26)mmHg before TIPS and(18.35±6.47)mmHg after TIPS,and the difference was significant(P＜0.05).No active bleeding nor declined hemoglobin was found within 72 h after TIPS,and the clinical success rate was 100%(20/20).No severe complication such as intraperitoneal hemorrhage,hemorrhage caused by hepatic carcinoma rupture nor bile leakage occurred.During the follow-up period,hepatic encephalopathy occurred in 4 cases(4/20,20.00%)but alleviated after symptomatic treatments.Recurrence of upper gastrointestinal hemorrhage was noticed in 2 cases(2/20,10.00%),while 6 patients died(6/20,30.00%).One,3,6 and 12 months after TIPS,the patency of stent shunt was 100%(20/20),100%(20/20),100%(20/20)and 95.00%(19/20),respectively.Conclusion Viatorr stent applicated in TIPS was effective and safe for treating PHC complicated with liver cirrhosis and upper gastrointestinal hemorrhage.

Objective To explore the factors related to the recovery of nil per os (NPO) patients after stroke by retrospective data analysis, and to establish a predictive model.Methods The information of demographics, evaluation and treatment of 141 stroke patients admitted to the Hearing and Language Department in Beijing Bo'ai Hospital from April, 2017 to November, 2020 were selected. The predictive model was established by univariate analysis and Logistic regression. The fitting degree and discriminant validity of the model were evaluated by Hosmer-Lemeshow (H-L) test and receiver operating characteristic (ROC) curve. Other 121 patients with post-stroke dysphagia from December, 2020 to November, 2021 were used as the validation set to verify the model.Results For univariate analysis, National Institute of Health Stroke Scale (NIHSS) score, drinking water test results, autonomous cough ability, cough after swallowing, movement ability of tongue and jaw, and electrical stimulation treatment were significantly associated with the outcome (H=65.803, χ2 > 4.623, P<0.05). Multivariate Logistic regression analysis showed that NIHSS score (X1, OR=0.772, 95%CI 0.64 to 0.82, P<0.001), spontaneous cough ability (X2, OR=5.116, 95%CI 1.28 to 20.41, P=0.021), and electrical stimulation during treatment (X3, OR=94.718, 95%CI 5.65 to 1589.26, P=0.002) were independent factors for the outcome of swallowing function. Thus, the predictive model was P=11+e−(2.368−0.325X1+1.632X2+4.551X3) P = 1 1 + e - ( 2.368 - 0.325 X 1 + 1.632 X 2 + 4.551 X 3 ) , which was well fitting (P=0.845), with the largest area under curve (0.884). The overall accuracy of the model in the validation set was 91.7%.Conclusion The patients with dysphagia would like to recover well if he/she was with lower NIHSS scores and normal autonomous cough ability; meanwhile, the addition of electrical stimulation therapy in comprehensive rehabilitation may be helpful. A predictive model has been established, which needs a further research.

Objective:To explore the feasibility of pretargeting technique for immunoPET with epidermal growth factor receptor (EGFR) monoclonal antibody in EGFR positive/negative tumor bearing mice.Methods:Cetuximab- Trans-cyclooctene (TCO)was obtained by modifying Cetuximab with TCO- N-hydroxysuccinimide (NHS). 2, 2′-((6-amino-1-(4, 7-bis-(carboxymethyl)-1, 4, 7-triazonan-1-yl)hexan-2-yl)azanediyl)-diacetic acid (L-NETA)was used as a chelating agent to prepare the radioligand 68Ga-L-NETA-tetrazine (Tz), then the labeling rate and in vitro stability of the product were determined. Human basal breast cancer cells MDA-MB-468 (EGFR+ ) and MDA-MB-231 (EGFR-) were cultured in vitro. In vitro experiments were performed to explore the specificity of the probe and the feasibility of pretargeting technique. Nude mice (Balb/c-nu) bearing xenografts of the above two cell lines were established. Cetuximab-TCO (50 μg) was injected into the tumor-bearing mice in advance, then 68Ga-L-NETA-Tz was injected at different time points (48, 36, 24 and 12 h), and pretargeting was realized through " click chemistry" . Small-animal PET imaging and biodistribution were performed to evaluate pharmacokinetic properties and specificity of the probe. The one-way analysis of variance was used to compare the data. Results:The 68Ga-L-NETA-Tz molecular probe was successfully prepared with the labeling yield >95%, and the radiochemical purity was >95% after 2 h. Cetuximab-TCO and 68Ga-L-NETA-Tz were added to MDA-MB-468 cells successively, and the cell uptake rate reached (0.69±0.04)% at 1 h, which demonstrated the feasibility of the pretargeting technique. PET imaging and biodistribution results showed that the best imaging results were obtained in 36 h pre-injection group, in which the tumor uptake was the highest ((0.77±0.05) percentage activity of injection dose per gram of tissue (%ID/g), 1 h) and the tumor/muscle ratio was optimal (4.67±0.46); the tumor uptake in the blocking group, the group without injecting Cetuximab-TCO, and the MDA-MB-231 group were significantly lower ((0.35±0.01), (0.39±0.05), (0.45±0.10) %ID/g; F=15.50, P=0.002). Conclusions:EGFR targeted immunoPET imaging is successfully performed in mouse models of breast cancer by injecting Cetuximab-TCO and 68Ga-L-NETA-Tz successively. It provides an effective method for immunoPET imaging of monoclonal antibodies.