To investigate the antimicrobial resistance of Enterococci isolated from 596 anal swabs,feces and environmental samples were collected from pig,cattle,chicken and quail farms in Chang-sha,Hunan Province,Enterococci were isolated and identified by mass spectrometry.The minimum inhibitory concentrations(MICs)of 10 antimicrobial agents were determined by AGAR diffusion method.Whole genome sequencing(WGS)was used to detect the distribution of multilocus se-quence typing(ST),drug resistance genes and virulence genes.A total of 272 strains of Enterococ-cus were isolated(45.6％).The isolates were resistant to cefoxitin(68.9％)and cefotiofur(58.5％),followed by trimethoprim/sulfamethoxazole(52.2％),vancomycin(4.4％),and linezolid(13.6％).In this study,six linezolid highly resistant Enterococci isolates were analyzed by whole genome sequencing to explore the transmission mechanism of linezolid resistance because linezolid is forbidden to be used in aquaculture.ST403(4/6),ST16(1/6)and ST476(1/6)were the most common ST types,which all originated from the same farm.Three oxazolidinone resistance genes(cfr,poxtA and optrA)were found in all 21 strains.One strain(Ecc60)carried all three oxazo-lidinone resistance genes,but none of them were located on the plasmid.tet(M),aph(3')-Ⅲ,and lsa(A)were found in all six Enterococcus isolates.Interestingly,the present study is the first to i-dentify enterococci carrying the optrA gene in quail fecal samples.The analysis of the genetic envi-ronment of oxazolidinone resistance genes showed that the genetic environment of cfr(D),poxtA and optrA of isolates from the same farm was similar.A total of 19 virulence genes were detected in 6 isolates,of which 12 genes(ElrA,SrtA,ace,agg,cCF10,cOB1,cad,camE,ebpA,ebpC,efaAfs,tpx)were carried by all 6 isolates,and the types of virulence genes in strains from the same farm were extremely similar.The results showed that the drug resistance of Enterococci iso-lated from the fish farms in Changsha was serious,and the resistance rate to linezolid,which was prohibited in the fish farms,was high.The oxazolidinone resistance gene loci were accompanied by other resistance genes,especially the florfenicol resistance gene(FexA),which may be related to the abuse of florfenicol in the fish farms.

BACKGROUND:Allogeneic hematopoietic stem cell transplantation is an important treatment for malignant hematological diseases,and delayed postoperative platelet implantation is a common complication that seriously affects the quality of patient survival;however,there are no standard protocols to improve platelet implantation rates and prevent platelet implantation delays. OBJECTIVE:To compare the safety and efficacy of oral Herombopag Olamine versus subcutaneous recombinant human thrombopoietin for promoting platelet implantation in patients with malignant hematological diseases undergoing haploid hematopoietic stem cell transplantation. METHODS:Clinical data of 163 patients with malignant hematological diseases who underwent haploidentical hematopoietic stem cell transplantation from January 2016 to October 2022 were retrospectively analyzed.A total of 72 patients who started to subcutaneously inject recombinant human thrombopoietin at+2 days were categorized into the recombinant human thrombopoietin group;a total of 27 patients who started to orally take Herombopag Olamine at+2 days were categorized into the Herombopag Olamine group;and 64 patients who did not apply Herombopag Olamine or recombinant human thrombopoietin were categorized into the blank control group.The implantation status,incidence of acute graft-versus-host disease of degree II-IV within 100 days,1-year survival rate,1-year recurrence rate,and safety were analyzed in the three groups. RESULTS AND CONCLUSION:(1)The average follow-up time was 52(12-87)months.The implantation time of neutrophils in the blank control group,recombinant human thrombopoietin group,and Herombopag Olamine group was(12.95±3.88)days,(14.04±3.71)days,and(13.89±2.74)days,respectively,with no statistically significant difference(P=0.352);the implantation time of platelets was(15.16±6.27)days,(17.67±6.52)days,and(17.00±4.75)days,with no statistically significant difference(P=0.287).(2)The complete platelet implantation rate on day 60 was 64.06%,90.28%,and 92.59%,respectively,and the difference was statistically significant(P<0.001).The subgroup analysis showed that the difference between the blank control group and the recombinant human thrombopoietin group was statistically significant(P<0.001),and the difference between the blank control group and the Herombopag Olamine group was statistically significant(P=0.004).The difference was not statistically significant between the recombinant human thrombopoietin group and Herombopag Olamine group(P=0.535).(3)100-day II-IV degree acute graft-versus-host disease incidence in the blank control group,recombinant human thrombopoietin group,and Herombopag Olamine group were 25.00%,30.56%,and 25.93%,respectively,and the difference was not statistically significant(P=0.752).(4)The incidence of cytomegalovirus anemia,cytomegalovirus pneumonia,and hepatic function injury had no statistical difference among the three groups(P>0.05).(5)During the follow-up period,there was no thrombotic event in any of the three groups of patients.(6)The results showed that recombinant human thrombopoietin and Herombopag Olamine could improve the platelet implantation rate of malignant hematological disease patients after haploidentical hematopoietic stem cell transplantation,with comparable efficacy and good safety.

Objective:To investigate the alterations in brain functional activity before and after chemotherapy in breast cancer patients with chemotherapy-related cognitive impairment (CRCI) using resting-state functional magnetic resonance imaging (rs-fMRI) and their relations with cognitive impairment.Methods:A prospective observational study was performed; female breast cancer patients with CRCI admitted to Department of Oncology, Affiliated Hospital 6 of Nantong University were recruited, and age- and education level-matched female healthy controls were chosen. Before and one month after chemotherapy, statuses of cognitive function, depression and anxiety in breast cancer patients with CRCI were evaluated by Montreal cognitive assessment (MoCA), functional assessment of cancer therapy-cognitive function (FACT-cog), self-rating depression scale (SDS), and self-rating anxiety scale (SAS); subsequently, conventional MRI and resting-state functional magnetic resonance imaging (rs-fMRI) were conducted. The healthy controls accepted MoCA, SDS, and SAS, followed by conventional MRI and rs-fMRI. Differences in clinical data and amplitude of low-frequency fluctuation (ALFF, rs-fMRI brain spontaneous neural activity index) were compared between breast cancer patients with CRCI before chemotherapy and healthy controls, and in the breast cancer patients with CRCI between before and after chemotherapy. Taking the brain regions with significant differences in ALFF before and after chemotherapy in breast cancer patients with CRCI as seed points, the difference in whole-brain functional connectivity (FC) before and after chemotherapy was compared in breast cancer patients with CRCI. Pearson or Spearman correlation tests were used to analyze the correlations of ALFF and FC in brain regions with significant differences in ALFF with cognitive function scores in breast cancer patients with CRCI.Results:(1) A total of 22 breast cancer patients with CRCI and 22 healthy controls were enrolled. Compared with the healthy controls, the breast cancer patients with CRCI before chemotherapy had significantly higher SDS and SAS scores ( P<0.05). Compared with breast cancer patients with CRCI before chemotherapy, the breast cancer patients with CRCI after chemotherapy had significantly lower MoCA, FACT-cog-perceived cognitive impairment, FACT-cog-comment from others on cognitive function, and FACT-cog-perceived cognitive ability ( P<0.05). (2) Compared with those before chemotherapy, breast cancer patients with CRCI after chemotherapy exhibited significantly increased ALFF in the right precuneus, right middle occipital gyrus, and left superior frontal gyrus, while statistically decreased FC in the right middle occipital gyrus-left middle temporal gyrus, right precentral gyrus-right middle temporal gyrus, and left superior frontal gyrus-left fusiform gyrus ( P<0.05). (3) ALFF in the right precentral gyrus in breast cancer patients with CRCI after chemotherapy was negatively correlated with difference value of FACT-cog before and after chemotherapy ( r=-0.497, P=0.018) and difference value of PCA before and after chemotherapy ( r s=-0.436, P=0.042); FC in the left superior frontal gyrus-left fusiform gyrus was positively correlated with score of FACT-cog-perceived cognitive impairment ( r=0.621, P=0.002). Conclusion:Chemotherapy induces compensatory enhancement of spontaneous neural activity in multiple brain regions in breast cancer patients with CRCI, accompanied by FC disruption at specific brain areas, which are associated with cognitive impairment.

To investigate the antimicrobial resistance of Enterococci isolated from 596 anal swabs,feces and environmental samples were collected from pig,cattle,chicken and quail farms in Chang-sha,Hunan Province,Enterococci were isolated and identified by mass spectrometry.The minimum inhibitory concentrations(MICs)of 10 antimicrobial agents were determined by AGAR diffusion method.Whole genome sequencing(WGS)was used to detect the distribution of multilocus se-quence typing(ST),drug resistance genes and virulence genes.A total of 272 strains of Enterococ-cus were isolated(45.6％).The isolates were resistant to cefoxitin(68.9％)and cefotiofur(58.5％),followed by trimethoprim/sulfamethoxazole(52.2％),vancomycin(4.4％),and linezolid(13.6％).In this study,six linezolid highly resistant Enterococci isolates were analyzed by whole genome sequencing to explore the transmission mechanism of linezolid resistance because linezolid is forbidden to be used in aquaculture.ST403(4/6),ST16(1/6)and ST476(1/6)were the most common ST types,which all originated from the same farm.Three oxazolidinone resistance genes(cfr,poxtA and optrA)were found in all 21 strains.One strain(Ecc60)carried all three oxazo-lidinone resistance genes,but none of them were located on the plasmid.tet(M),aph(3')-Ⅲ,and lsa(A)were found in all six Enterococcus isolates.Interestingly,the present study is the first to i-dentify enterococci carrying the optrA gene in quail fecal samples.The analysis of the genetic envi-ronment of oxazolidinone resistance genes showed that the genetic environment of cfr(D),poxtA and optrA of isolates from the same farm was similar.A total of 19 virulence genes were detected in 6 isolates,of which 12 genes(ElrA,SrtA,ace,agg,cCF10,cOB1,cad,camE,ebpA,ebpC,efaAfs,tpx)were carried by all 6 isolates,and the types of virulence genes in strains from the same farm were extremely similar.The results showed that the drug resistance of Enterococci iso-lated from the fish farms in Changsha was serious,and the resistance rate to linezolid,which was prohibited in the fish farms,was high.The oxazolidinone resistance gene loci were accompanied by other resistance genes,especially the florfenicol resistance gene(FexA),which may be related to the abuse of florfenicol in the fish farms.

Objective:To investigate the alterations in brain functional activity before and after chemotherapy in breast cancer patients with chemotherapy-related cognitive impairment (CRCI) using resting-state functional magnetic resonance imaging (rs-fMRI) and their relations with cognitive impairment.Methods:A prospective observational study was performed; female breast cancer patients with CRCI admitted to Department of Oncology, Affiliated Hospital 6 of Nantong University were recruited, and age- and education level-matched female healthy controls were chosen. Before and one month after chemotherapy, statuses of cognitive function, depression and anxiety in breast cancer patients with CRCI were evaluated by Montreal cognitive assessment (MoCA), functional assessment of cancer therapy-cognitive function (FACT-cog), self-rating depression scale (SDS), and self-rating anxiety scale (SAS); subsequently, conventional MRI and resting-state functional magnetic resonance imaging (rs-fMRI) were conducted. The healthy controls accepted MoCA, SDS, and SAS, followed by conventional MRI and rs-fMRI. Differences in clinical data and amplitude of low-frequency fluctuation (ALFF, rs-fMRI brain spontaneous neural activity index) were compared between breast cancer patients with CRCI before chemotherapy and healthy controls, and in the breast cancer patients with CRCI between before and after chemotherapy. Taking the brain regions with significant differences in ALFF before and after chemotherapy in breast cancer patients with CRCI as seed points, the difference in whole-brain functional connectivity (FC) before and after chemotherapy was compared in breast cancer patients with CRCI. Pearson or Spearman correlation tests were used to analyze the correlations of ALFF and FC in brain regions with significant differences in ALFF with cognitive function scores in breast cancer patients with CRCI.Results:(1) A total of 22 breast cancer patients with CRCI and 22 healthy controls were enrolled. Compared with the healthy controls, the breast cancer patients with CRCI before chemotherapy had significantly higher SDS and SAS scores ( P<0.05). Compared with breast cancer patients with CRCI before chemotherapy, the breast cancer patients with CRCI after chemotherapy had significantly lower MoCA, FACT-cog-perceived cognitive impairment, FACT-cog-comment from others on cognitive function, and FACT-cog-perceived cognitive ability ( P<0.05). (2) Compared with those before chemotherapy, breast cancer patients with CRCI after chemotherapy exhibited significantly increased ALFF in the right precuneus, right middle occipital gyrus, and left superior frontal gyrus, while statistically decreased FC in the right middle occipital gyrus-left middle temporal gyrus, right precentral gyrus-right middle temporal gyrus, and left superior frontal gyrus-left fusiform gyrus ( P<0.05). (3) ALFF in the right precentral gyrus in breast cancer patients with CRCI after chemotherapy was negatively correlated with difference value of FACT-cog before and after chemotherapy ( r=-0.497, P=0.018) and difference value of PCA before and after chemotherapy ( r s=-0.436, P=0.042); FC in the left superior frontal gyrus-left fusiform gyrus was positively correlated with score of FACT-cog-perceived cognitive impairment ( r=0.621, P=0.002). Conclusion:Chemotherapy induces compensatory enhancement of spontaneous neural activity in multiple brain regions in breast cancer patients with CRCI, accompanied by FC disruption at specific brain areas, which are associated with cognitive impairment.

Objective:To construct an artificial intelligence-assisted diagnosis system to recognize the characteristics of Helicobacter pylori ( HP) infection under endoscopy, and evaluate its performance in real clinical cases. Methods:A total of 1 033 cases who underwent 13C-urea breath test and gastroscopy in the Digestive Endoscopy Center of Renmin Hospital of Wuhan University from January 2020 to March 2021 were collected retrospectively. Patients with positive results of 13C-urea breath test (which were defined as HP infertion) were assigned to the case group ( n=485), and those with negative results to the control group ( n=548). Gastroscopic images of various mucosal features indicating HP positive and negative, as well as the gastroscopic images of HP positive and negative cases were randomly assigned to the training set, validation set and test set with at 8∶1∶1. An artificial intelligence-assisted diagnosis system for identifying HP infection was developed based on convolutional neural network (CNN) and long short-term memory network (LSTM). In the system, CNN can identify and extract mucosal features of endoscopic images of each patient, generate feature vectors, and then LSTM receives feature vectors to comprehensively judge HP infection status. The diagnostic performance of the system was evaluated by sensitivity, specificity, accuracy and area under receiver operating characteristic curve (AUC). Results:The diagnostic accuracy of this system for nodularity, atrophy, intestinal metaplasia, xanthoma, diffuse redness + spotty redness, mucosal swelling + enlarged fold + sticky mucus and HP negative features was 87.5% (14/16), 74.1% (83/112), 90.0% (45/50), 88.0% (22/25), 63.3% (38/60), 80.1% (238/297) and 85.7% (36 /42), respectively. The sensitivity, specificity, accuracy and AUC of the system for predicting HP infection was 89.6% (43/48), 61.8% (34/55), 74.8% (77/103), and 0.757, respectively. The diagnostic accuracy of the system was equivalent to that of endoscopist in diagnosing HP infection under white light (74.8% VS 72.1%, χ2=0.246, P=0.620). Conclusion:The system developed in this study shows noteworthy ability in evaluating HP status, and can be used to assist endoscopists to diagnose HP infection.

Objective:To assess the diagnostic efficacy of upper gastrointestinal endoscopic image assisted diagnosis system (ENDOANGEL-LD) based on artificial intelligence (AI) for detecting gastric lesions and neoplastic lesions under white light endoscopy.Methods:The diagnostic efficacy of ENDOANGEL-LD was tested using image testing dataset and video testing dataset, respectively. The image testing dataset included 300 images of gastric neoplastic lesions, 505 images of non-neoplastic lesions and 990 images of normal stomach of 191 patients in Renmin Hospital of Wuhan University from June 2019 to September 2019. Video testing dataset was from 83 videos (38 gastric neoplastic lesions and 45 non-neoplastic lesions) of 78 patients in Renmin Hospital of Wuhan University from November 2020 to April 2021. The accuracy, the sensitivity and the specificity of ENDOANGEL-LD for image testing dataset were calculated. The accuracy, the sensitivity and the specificity of ENDOANGEL-LD in video testing dataset for gastric neoplastic lesions were compared with those of four senior endoscopists.Results:In the image testing dataset, the accuracy, the sensitivity, the specificity of ENDOANGEL-LD for gastric lesions were 93.9% (1 685/1 795), 98.0% (789/805) and 90.5% (896/990) respectively; while the accuracy, the sensitivity and the specificity of ENDOANGEL-LD for gastric neoplastic lesions were 88.7% (714/805), 91.0% (273/300) and 87.3% (441/505) respectively. In the video testing dataset, the sensitivity [100.0% (38/38) VS 85.5% (130/152), χ2=6.220, P=0.013] of ENDOANGEL-LD was higher than that of four senior endoscopists. The accuracy [81.9% (68/83) VS 72.0% (239/332), χ2=3.408, P=0.065] and the specificity [ 66.7% (30/45) VS 60.6% (109/180), χ2=0.569, P=0.451] of ENDOANGEL-LD were comparable with those of four senior endoscopists. Conclusion:The ENDOANGEL-LD can accurately detect gastric lesions and further diagnose neoplastic lesions to help endoscopists in clinical work.

Objective:To construct a real-time artificial intelligence (AI)-assisted endoscepic diagnosis system based on YOLO v3 algorithm, and to evaluate its ability of detecting focal gastric lesions in gastroscopy.Methods:A total of 5 488 white light gastroscopic images (2 733 images with gastric focal lesions and 2 755 images without gastric focal lesions) from June to November 2019 and videos of 92 cases (288 168 clear stomach frames) from May to June 2020 at the Digestive Endoscopy Center of Renmin Hospital of Wuhan University were retrospectively collected for AI System test. A total of 3 997 prospective consecutive patients undergoing gastroscopy at the Digestive Endoscopy Center of Renmin Hospital of Wuhan University from July 6, 2020 to November 27, 2020 and May 6, 2021 to August 2, 2021 were enrolled to assess the clinical applicability of AI System. When AI System recognized an abnormal lesion, it marked the lesion with a blue box as a warning. The ability to identify focal gastric lesions and the frequency and causes of false positives and false negatives of AI System were statistically analyzed.Results:In the image test set, the accuracy, the sensitivity, the specificity, the positive predictive value and the negative predictive value of AI System were 92.3% (5 064/5 488), 95.0% (2 597/2 733), 89.5% (2 467/ 2 755), 90.0% (2 597/2 885) and 94.8% (2 467/2 603), respectively. In the video test set, the accuracy, the sensitivity, the specificity, the positive predictive value and the negative predictive value of AI System were 95.4% (274 792/288 168), 95.2% (109 727/115 287), 95.5% (165 065/172 881), 93.4% (109 727/117 543) and 96.7% (165 065/170 625), respectively. In clinical application, the detection rate of local gastric lesions by AI System was 93.0% (6 830/7 344). A total of 514 focal gastric lesions were missed by AI System. The main reasons were punctate erosions (48.8%, 251/514), diminutive xanthomas (22.8%, 117/514) and diminutive polyps (21.4%, 110/514). The mean number of false positives per gastroscopy was 2 (1, 4), most of which were due to normal mucosa folds (50.2%, 5 635/11 225), bubbles and mucus (35.0%, 3 928/11 225), and liquid deposited in the fundus (9.1%, 1 021/11 225).Conclusion:The application of AI System can increase the detection rate of focal gastric lesions.

Objective:To compare the cost-effectiveness before and after using an artificial intelligence gastroscopy-assisted system for early gastric cancer screening.Methods:The gastroscopy cases before (non-AI group) and after (AI group) the use of artificial intelligence gastroscopy-assisted system were retrospectively collected in Renmin Hospital of Wuhan University from January 1, 2017 to February 28, 2022. The proportion of early gastric cancer among all gastric cancer was analyzed. Costs were estimated based on the standards of Renmin Hospital of Wuhan University and the 2021 edition of Wuhan Disease Diagnosis-related Group Payment Standards. Cost-effectiveness analysis was conducted per 100 thousand cases with and without the system. And the incremental cost-effectiveness ratio was calculated.Results:For the non-AI group, the proportion of early gastric cancer among all gastric cancer was 28.81% (70/243). The cost of gastroscopy screening per 100 thousand was 54 598.0 thousand yuan, early gastric treatment cost was 221.8 thousand yuan, and a total cost was 54 819.8 thousand yuan. The direct effectiveness was 894.2 thousand yuan, the indirect effectiveness was 1 828.2 thousand yuan and the total effectiveness was 2 722.4 thousand yuan per 100 thousand cases. For the AI group, the early gastric cancer diagnositic rate was 36.56%(366/1 001), where gastroscopy cost was 53 440.0 thousand yuan, early gastric treatment cost 315.8 thousand yuan, the total cost 53 755.8 thousand yuan. The direct effectiveness was 1 273.5 thousand yuan, indirect effectiveness 2 603.1 thousand yuan and the total effectiveness 3 876.6 thousand yuan per 100 thousand cases. The use of the system reduced the cost of early gastric cancer screening by 1 064.0 thousand yuan, and increased the benefit by 1 154.2 thousand yuan per 100 thousand cases. The incremental cost-effectiveness ratio was -0.92.Conclusion:The use of artificial intelligence gastroscopy-assisted system for gastric early cancer screening can reduce medical costs as well as improve the efficiency of screening, and it is recommended for gastroscopy screening .

Objective:To analyze the expression of circular RNA circ_0008274 in cetuximab-resistant colorectal cancer cells using bioinformatics technology and to explore its involvement in the development of cetuximab resistance.Methods:Five concentrations of cetuximab (10, 50, 100, 150, 200 nmol/L) were set. Cetuximab-resistant cells DiFi-R and Caco-2-R were screened out and established by concentration increasing method using colorectal cancer cells DiFi and Caco-2. The expression of circ_0008274 in DiFi-R and Caco-2-R cells was detected by reverse transcription-polymerase chain reaction(RT-PCR). The interaction and regulation between circ_0008274 and microRNA(miR)-140-3p were analyzed by double-luciferase reporter assay. The highly expressed gene SMARCC1 related to cetuximab resistance was determined by Western blotting. Circ_0008274 in DiFi-R and Caco-2-R cells were knocked out with small interfering RNA si-circ_0008274 transfection. After knock out, the differences in the colony formation and cell proliferation in DiFi-R and Caco-2-R cells were compared. MiR-140-3p mimic and blank control miR were transfected into DiFi-R and Caco-2-R cells. After transfection the difference in cell proliferation between transfected with miR-140-3p mimic and blank control miR in DiFi-R and Caco-2-R cells were analyzed. After Caco-2-R cell was knocked out with si-circ_0008274, the changes of SMARCC1 protein expression rescued by pcDNA3.1 SMARCC1 and cell viability were analyzed. The tumor specimens of 15 colorectal cancer patients hospitalized in Renmin Hospital of Wuhan University from March 2019 to August 2020 were included. According to the treatment effect, the patients were divided into sensitive group (11 cases) and drug-resistant group (4 cases). The relative expression levels of circ_0008274, downstream SMARCC1and miR-140-3p in colorectal cancer tissues in the two groups were detected by RT-PCR. Independent sample t test was used for statistical analysis. Results:The level of circ_0008274 in DiFi-R cells was 2.33±0.12 times of that of DiFi cells, while the level in Caco-2-R was (2.92±0.42) times of that of Caco-2 cells, and the differences were statistically significant ( t=19.97 and 7.80, both P<0.05). The results of double-luciferase reporter showed that after miR-140-3p mimic combined with wild-type circ_0008274, the relative fluorescence intensity was lower than before (0.28±0.04 vs. 1.00±0.00), and the difference was statistically significant ( t=-30.71, P=0.001). The expression of SMARCC1 protein in DiFi-R and Caco-2-R cells was significantly increased, the expression at protein level was higher than that of DiFi and Caco-2 cells (2.22±0.36 vs. 0.61±0.17, 0.85±0.11 vs. 0.35±0.08), and the differences were statistically significant ( t=6.23 and 6.32, both P<0.01). After circ_0008274 was knocked out, the numbers of colony formation of DiFi-R and Caco-2-R cells were both lower than those of before knockout (36.67±4.04 vs. 66.00±9.54, 17.35±4.04 vs. 52.33±8.02), the relative active cell ratios after interventing by 10, 50, 100, 150 and 200 nmol/L cetuximab were also lower than those of before knockout (DiFi-R cells: (73.75±2.75)% vs. (88.10±2.48)%, (56.50±6.66)% vs. (75.15±6.03)%, (35.75±5.32)% vs. (59.63±6.67)%, (24.25±3.30)% vs. (52.40±6.71)%, (6.25±2.75)% vs. (48.60±5.38)%; Caco-2-R cells: (63.74±5.25)% vs. (85.76±4.79)%, (56.50±4.20)% vs.(83.50±3.90)%, (46.00±2.94)% vs. (80.00±6.05)%, (35.30±5.56)% vs. (68.30±4.57)%, (12.25±7.37)% vs. (62.40±7.51)%), and the differences were statistically significant ( t=4.90, 6.71, -7.75, -4.16, -5.60, -7.53, -14.02, -6.19, -8.33, -10.10, -9.17 and -9.56, all P<0.01). After transfecting with miR-140-3p mimic, the relative active cell ratios of DiFi-R and Caco-2-R cells interventing by 10, 50, 100, 150 and 200 nmol/L cetuximab were both lower than those transfected with blank control miR (DiFi-R cells: (71.55±4.97)% vs. (85.90±2.66)%, (51.58±3.91)% vs. (74.95±6.35)%, (41.23±8.84)% vs. (58.43±7.05)%, (28.60±5.26)% vs. (53.75±5.65)%, (18.90±5.13)% vs. (51.30±3.30)%; Caco-2-R cells: (61.75±2.22)% vs. (90.10±1.41)%, (53.25±4.17)% vs. (86.18±2.69)%, (46.38±4.55)% vs. (77.75±6.70)%, (36.10±8.76)% vs. (70.15±4.18)%, (24.25±2.63)% vs. (65.10±7.62)%), and the differences were statistically significant ( t=-5.09, -6.47, -3.05, -6.28, -10.30, -21.48, -12.83, -8.01, -6.79 and -10.12, all P<0.01). After circ_0008274 was knocked out, the SMARCC1 protein level of Caco-2-R cells rescued by pcDNA3.1 SMARCC1 was higher than that of before rescue (0.63±0.19 vs. 0.09±0.03), and the relative active cell ratios after interventing by 10, 50, 100, 150 and 200 nmol/L cetuximab were also higher than that of before rescue ((93.10±3.56)% vs. (83.83±3.97)%, (83.28±4.26)% vs. (60.90±7.02)%, (61.83±2.12)% vs. (50.10±5.59)%, (53.20±3.74)% vs. (40.50±3.42)%, (46.20±4.08)% vs. (30.80±4.82)%), and the differences were statistically significant( t=3.55, 3.52, 5.44, 3.87, 4.64 and 4.88, all P<0.01). The relative expression levels of circ_0008274 and downstream SMARCC1 of colon cancer tissues in the drug-resistant group were higher than those in the sensitive group (6.45±1.32 vs. 2.26±1.39, 12.53±1.60 vs. 3.82±1.56), and the relative expression level of miR-140-3p was lower than that in the sensitive group (3.91±1.25 vs. 7.43±2.23), and the differences were statistically significant ( t=5.22, 9.51, -2.93, all P<0.01). Conclusions:Circular RNA circ_0008274 is highly expressed in colorectal cancer tissues and cetuximab resistant cells, interacts and inhibits miR-140-3p expression, up-regulates SMARCC1, and participates in the occurrence of cetuximab resistance. PcDNA3.1 SMARCC1 rescue can block the sensitization effect of si-circ_0008274 on cetuximab, and can significantly increase cetuximab resistance of colorectal cancer cells.