Background and purpose:Approximately 30%of patients with metastatic colorectal cancer(CRC)develops pulmonary metastasis,yet less than 10%are eligible for surgical resection.Radiofrequency ablation(RFA)serves as an alternative therapy for non-surgical candidates,but the relationship between its efficacy and tumor diameter remains controversial.This study aimed to investigate the impact of tumor size on survival outcomes and local progression risk in CRC patients with pulmonary metastasis after RFA,and to validate the clinical utility of a 3 cm threshold for prognosis.Methods:This retrospective study included CRC patients with pulmonary metastasis who underwent RFA at Fudan University Shanghai Cancer Center between January 2016 and December 2024.Patients were stratified into two groups based on maximum lesion diameter:≤3 cm(Small group)and 3-5 cm(Large group).Patient inclusion criteria:⑴ pathologically confirmed lung metastases originating from CRC,with metastases limited to the lungs or extra-pulmonary metastatic lesions having been radically treated;⑵ maximum lesion diameter<5 cm;⑶complete clinical data available;⑷ complete imaging data available,including computed tomography(CT)images during ablation and contrast-enhanced CT images during postoperative follow-up;⑸ follow-up time of at least＞6 months after RFA;⑹ technical complete ablation;⑺ fewer than 3 pulmonary metastatic lesions.Exclusion criteria:⑴ target lesions previously treated with local therapies such as RFA or radiotherapy;⑵ patients unable to tolerate RFA;⑶ patients with follow-up time＜6 months after RFA.Three senior interventional physicians performed percutaneous RFA under guidance of a 64-slice spiral CT scanner.Chest contrast-enhanced CT scans obtained 1 month after RFA were used as the baseline,followed by contrast-enhanced CT scans every 3 months for 1 year,then every 6 months for subsequent follow-up.This study was approved by the medical ethics committee of Fudan University Shanghai Cancer Center(ethical approval number:2108241-11).Primary endpoints included overall survival(OS),progression-free survival(PFS),and local tumor progression(LTP).Kaplan-Meier analysis and multivariate COX regression were employed to evaluate the independent prognostic value of tumor size.Results:A total of 134 patients who met the inclusion criteria were ultimately enrolled,including 77 in the Small group and 57 in the Large group.With a median follow-up of 35 months,the≤3 cm group demonstrated superior 1-,3-,and 5-year OS rates(100.0%,95.1%,74.2%)compared to the 3-5 cm group(94.7%,36.8%,27.0%,P＜0.0001),and the≤3 cm group demonstrated superior 1-,3-,and 5-year PFS rates(90.9%,34.4%,23.3%)compared to the 3-5 cm group(13.8%,0.0%,0.0%,P＜0.000 1).The≤3 cm group also exhibited significantly lower 1-,3-,and 5-year LTP rates(0.0%,19.7%,33.6%)compared to the 3-5 cm group(46.0%,75.5%,75.5%,P＜0.000 1).Multivariable analysis identified tumor diameter＞3 cm as an independent predictor of worse OS[hazard ratio(HR)=6.49,95%CI:3.18-13.24,P＜0.001],while elevated preoperative carcinoembryonic antigen(CEA)(≥5 ng/mL)correlated with shorter OS(HR=1.82,P=0.033).Conclusion:CRC patients with pulmonary metastasis and tumor diameters of 3-5 cm exhibited significantly inferior survival outcomes after RFA compared to the≤3 cm group.A tumor diameter of 3 cm can serve as a critical threshold for selecting RFA indications,and combining preoperative CEA levels can optimize patient stratification.

Objective To compare the effect of transcranial direct current stimulation(tDCS)combined with seated Taijiquan Yun-shou in different sequences on brain functional activation in healthy youths.Methods From September to December,2024,14 healthy young medical interns or probationers were recruited from the Fifth Hospital of Xiamen.They randomly completed three interventions in a crossover design:Yunshou training followed immediately by tDCS(Y-S group),tDCS intervention followed immediately by Yunshou training(S-Y group),and simultaneous implementation of tDCS intervention and Yunshou training(Sim group).Yunshou was practiced in a seated position.For tDCS,the anode was placed over the left primary motor cortex(M1),and the cathode over the right M1.Changes in oxyhemoglobin(HbO2)concentration in the regions of interest were mea-sured using functional near-infrared spectroscopy.Results Three cases dropped down.The brain regions with significant differences before and after intervention included:CH3,CH7 and CH23 of right prefrontal cortex(PFC)in Y-S group;CH12 of left PFC in S-Y group;and CH9,CH10 and CH25 of the left PFC,CH13 and CH14 of the left sensorimotor cortex(SMC),CH15 of the right pre-motor and supplementary motor cortex(PMC),and CH16 of the right SMC in Sim group(P<0.05).After inter-vention,HbO2 concentration was the highest in the bilateral PFC,bilateral PMC and left SMC in the Y-S group(P<0.05);and it was almost the same between Sim group and S-Y group(P>0.05),except that of the right PFC decreased in Sim group.Conclusion The sequential combination of brain-limb integrated regulation is a key factor influencing the immediate cor-tical activation pattern.

Objective To compare the effect of transcranial direct current stimulation(tDCS)combined with seated Taijiquan Yun-shou in different sequences on brain functional activation in healthy youths.Methods From September to December,2024,14 healthy young medical interns or probationers were recruited from the Fifth Hospital of Xiamen.They randomly completed three interventions in a crossover design:Yunshou training followed immediately by tDCS(Y-S group),tDCS intervention followed immediately by Yunshou training(S-Y group),and simultaneous implementation of tDCS intervention and Yunshou training(Sim group).Yunshou was practiced in a seated position.For tDCS,the anode was placed over the left primary motor cortex(M1),and the cathode over the right M1.Changes in oxyhemoglobin(HbO2)concentration in the regions of interest were mea-sured using functional near-infrared spectroscopy.Results Three cases dropped down.The brain regions with significant differences before and after intervention included:CH3,CH7 and CH23 of right prefrontal cortex(PFC)in Y-S group;CH12 of left PFC in S-Y group;and CH9,CH10 and CH25 of the left PFC,CH13 and CH14 of the left sensorimotor cortex(SMC),CH15 of the right pre-motor and supplementary motor cortex(PMC),and CH16 of the right SMC in Sim group(P<0.05).After inter-vention,HbO2 concentration was the highest in the bilateral PFC,bilateral PMC and left SMC in the Y-S group(P<0.05);and it was almost the same between Sim group and S-Y group(P>0.05),except that of the right PFC decreased in Sim group.Conclusion The sequential combination of brain-limb integrated regulation is a key factor influencing the immediate cor-tical activation pattern.

Objective To investigate the prognostic value of thrombin-antithrombin III complex(TAT),plasmin-α2-plasmin inhibitor complex(PIC),thrombomodulin(TM)and tissue plasminogen activator-inhibitor complex(t-PAIC)in patients with myelodysplastic syndrome(MDS).Methods Selected 88 primary MDS patients diagnosed at the 521 Hospital of Ordnance Industry from January 2018 to January 2021.Plasma levels of TAT,PIC,TM,t-PAIC,fibrin degradation products(FDP)and D-dimer(D-D)were measured.A multivariate approach was used to analyze the association between overall survival(OS)and the levels of each coagulation marker.Coagulation markers significantly associated with OS were used to construct a coagulation prognostic scoring system.Based on the median coagulation marker score,MDS patients were divided into high and low score groups.Kaplan-Meier analysis was used to plot survival curves.Results TAT(OR=1.667),PIC(OR=0.734),TM(OR=1.294)and t-PAIC(OR=1.523)were independent factors influencing OS in MDS patients(Wald χ2=0.671～10.751,all P<0.05).The β-values were integrated as statistical weights to construct a coagulation marker score,calculated as follows:[TAT]×0.502-[PIC]×1.013+[TM]×0.181+[t-PAIC]×0.381.The OS(median 14.6 months)and leukemia free survival(LFS)(median 10.3 months)of patients in the high coagulation marker score group were significantly lower than those in the low score group(33.6 months,35.2 months)(Log rank=20.57,26.84,all P<0.001).Subgroup analysis indicated that in both the low-risk IPSS-R subgroup(very low,low,and intermediate risk)and the high-risk IPSS-R subgroup(high and very high risk),the OS(Log rank=9.12,4.30)and LFS(Log rank=4.54,8.51)of the high coagulation marker score group were lower than those of the low score group(all P<0.05).Bivariate analysis showed a moderate correlation between the coagulation marker score and Revise International Prognostic Scoring System(IPSS-R)(PCC=0.536,P<0.001).Multivariate analysis indicated that IPSS-R and high coagulation marker scores were independent risk factors for OS and LFS in MDS patients(P<0.05).Conclusion The coagulation marker score,based on TAT,PIC,TM and t-PAIC,can serve as an independent prognostic factor for OS and LFS in MDS patients.

Objective:To investigate intraoperative pathological findings and the interventional effects of "deep cervical lymphaticovenous anastomosis+" (dcLVA+) on deep cervical lymphatic drainage as well as the blood flow of carotid artery and jugular vein in elderly patients with cognitive impairment, and to put forward the thoughts based on the findings from the surgery.Methods:Between May 2024 and December 2024, retrospective analysis of Microsurgery Hospital, Fengcheng Hospital, Xi'an Medical College performed dcLVA+ between the deep cervical lymphatics or lymph nodes and jugular veins in 50 elderly patients with cognitive impairment (19 males and 31 females, aged 55-88 years with 69.94 years in average). Nine patients were found with Clinical Dementia Rating (CDR) score at 1 (mild), 7 with CDR score at 2 (moderate) and 34 with CDR score at 3 (severe). Intraoperative observations based on literature reviews had identified anatomical relationships between the lymphatic sacs containing cervical lymphatic chain and the carotid sheath. The lymph node count, size, distribution, thickness of fat tissue and conditions of lymphatic vessels were documented. Ultrasound was used to compare the blood flow of carotid artery and jugular vein as well as the cross-sectional areas at the planes of hyoid and cricoid cartilage before and after the closure of incisions under anaesthesia in 39 patients. Correlation analyses for Mini-Mental State Examination (MMSE), Montreal Cognitive Assessment (MoCa), Activities of Daily Living (ADL) and Agitation behavior score before and 1 week after surgery were performed using Spearman's correlation and Wilcoxon paired tests. P<0.05 was considered statistically significant. Postoperative follow-ups were conducted via the visit of outpatient clinic and WeChat and telephone interviews. Results:In surgery, the cervical lymphatic chain was found running within an almost enclosed sac surrounding the carotid sheath. There were enlarged lymph nodes, increased fat deposition, lymphatic dilation or fibrosis in the sac. The preoperative blood flow in the carotid artery at the planes of hyoid and cricoid cartilage in the 39 patients was recorded at 150.52 ml/min±40.33 ml/min and 358.29 ml/min±129.30 ml/min, while that in the jugular vein was at 172.50 ml/min±63.94 ml/min and 317.00 ml/min±105.21 ml/min, respectively, both were far lower than the normal blood flow. There were statistically significant differences in the blood flow of carotid artery and jugular vein before and after surgery ( P<0.01). It was found that the preoperative blood flow of the internal carotid artery at the plane of hyoid was positively correlated with the preoperative scores of MMSE ( P<0.01), MoCa ( P<0.05) and ADL ( P<0.01). The blood flow of the common carotid artery at the plane of cricoid cartilage was found significantly and positively correlated with the preoperative scores of MMSE ( P<0.05). It was also noted that the blood flow of the internal carotid artery at the plane of hyoid was significantly and positively correlated with the postoperative ADL ( P<0.01) but negatively correlated with the Agitation behavior score ( P<0.05). The blood flow of the common carotid artery at the plane of cricoid cartilage was significantly and positively correlated with the postoperative scores of MMSE and MoCa ( P<0.05). The blood flow of the internal jugular vein at the plane of hyoid was negatively correlated with the Agitation behavior score ( P<0.01). The cross-sectional area of carotid artery at the plane of left hyoid was significantly and positively correlated with the MMSE score ( P<0.05). Statistically significant differences were observed in MMSE, MoCa, ADL and Agitation behavior score before and after surgery ( P<0.01). Conclusion:dcLVA+ shows a certain therapeutic benefit to the elderly patients with cognitive impairment. The intraoperatively observed pathological changes in cervical lymphatic sacs affect deep cervical lymphatic drainage and the blood flow of carotid artery and jugular vein. Further studies are necessary to find out whether the findings from this study would be the specific pathological changes and the morbidity mechanisms among the elderly patients with cognitive impairment.

Objective To investigate the prognostic value of thrombin-antithrombin III complex(TAT),plasmin-α2-plasmin inhibitor complex(PIC),thrombomodulin(TM)and tissue plasminogen activator-inhibitor complex(t-PAIC)in patients with myelodysplastic syndrome(MDS).Methods Selected 88 primary MDS patients diagnosed at the 521 Hospital of Ordnance Industry from January 2018 to January 2021.Plasma levels of TAT,PIC,TM,t-PAIC,fibrin degradation products(FDP)and D-dimer(D-D)were measured.A multivariate approach was used to analyze the association between overall survival(OS)and the levels of each coagulation marker.Coagulation markers significantly associated with OS were used to construct a coagulation prognostic scoring system.Based on the median coagulation marker score,MDS patients were divided into high and low score groups.Kaplan-Meier analysis was used to plot survival curves.Results TAT(OR=1.667),PIC(OR=0.734),TM(OR=1.294)and t-PAIC(OR=1.523)were independent factors influencing OS in MDS patients(Wald χ2=0.671～10.751,all P<0.05).The β-values were integrated as statistical weights to construct a coagulation marker score,calculated as follows:[TAT]×0.502-[PIC]×1.013+[TM]×0.181+[t-PAIC]×0.381.The OS(median 14.6 months)and leukemia free survival(LFS)(median 10.3 months)of patients in the high coagulation marker score group were significantly lower than those in the low score group(33.6 months,35.2 months)(Log rank=20.57,26.84,all P<0.001).Subgroup analysis indicated that in both the low-risk IPSS-R subgroup(very low,low,and intermediate risk)and the high-risk IPSS-R subgroup(high and very high risk),the OS(Log rank=9.12,4.30)and LFS(Log rank=4.54,8.51)of the high coagulation marker score group were lower than those of the low score group(all P<0.05).Bivariate analysis showed a moderate correlation between the coagulation marker score and Revise International Prognostic Scoring System(IPSS-R)(PCC=0.536,P<0.001).Multivariate analysis indicated that IPSS-R and high coagulation marker scores were independent risk factors for OS and LFS in MDS patients(P<0.05).Conclusion The coagulation marker score,based on TAT,PIC,TM and t-PAIC,can serve as an independent prognostic factor for OS and LFS in MDS patients.

Background and purpose:Approximately 30%of patients with metastatic colorectal cancer(CRC)develops pulmonary metastasis,yet less than 10%are eligible for surgical resection.Radiofrequency ablation(RFA)serves as an alternative therapy for non-surgical candidates,but the relationship between its efficacy and tumor diameter remains controversial.This study aimed to investigate the impact of tumor size on survival outcomes and local progression risk in CRC patients with pulmonary metastasis after RFA,and to validate the clinical utility of a 3 cm threshold for prognosis.Methods:This retrospective study included CRC patients with pulmonary metastasis who underwent RFA at Fudan University Shanghai Cancer Center between January 2016 and December 2024.Patients were stratified into two groups based on maximum lesion diameter:≤3 cm(Small group)and 3-5 cm(Large group).Patient inclusion criteria:⑴ pathologically confirmed lung metastases originating from CRC,with metastases limited to the lungs or extra-pulmonary metastatic lesions having been radically treated;⑵ maximum lesion diameter<5 cm;⑶complete clinical data available;⑷ complete imaging data available,including computed tomography(CT)images during ablation and contrast-enhanced CT images during postoperative follow-up;⑸ follow-up time of at least＞6 months after RFA;⑹ technical complete ablation;⑺ fewer than 3 pulmonary metastatic lesions.Exclusion criteria:⑴ target lesions previously treated with local therapies such as RFA or radiotherapy;⑵ patients unable to tolerate RFA;⑶ patients with follow-up time＜6 months after RFA.Three senior interventional physicians performed percutaneous RFA under guidance of a 64-slice spiral CT scanner.Chest contrast-enhanced CT scans obtained 1 month after RFA were used as the baseline,followed by contrast-enhanced CT scans every 3 months for 1 year,then every 6 months for subsequent follow-up.This study was approved by the medical ethics committee of Fudan University Shanghai Cancer Center(ethical approval number:2108241-11).Primary endpoints included overall survival(OS),progression-free survival(PFS),and local tumor progression(LTP).Kaplan-Meier analysis and multivariate COX regression were employed to evaluate the independent prognostic value of tumor size.Results:A total of 134 patients who met the inclusion criteria were ultimately enrolled,including 77 in the Small group and 57 in the Large group.With a median follow-up of 35 months,the≤3 cm group demonstrated superior 1-,3-,and 5-year OS rates(100.0%,95.1%,74.2%)compared to the 3-5 cm group(94.7%,36.8%,27.0%,P＜0.0001),and the≤3 cm group demonstrated superior 1-,3-,and 5-year PFS rates(90.9%,34.4%,23.3%)compared to the 3-5 cm group(13.8%,0.0%,0.0%,P＜0.000 1).The≤3 cm group also exhibited significantly lower 1-,3-,and 5-year LTP rates(0.0%,19.7%,33.6%)compared to the 3-5 cm group(46.0%,75.5%,75.5%,P＜0.000 1).Multivariable analysis identified tumor diameter＞3 cm as an independent predictor of worse OS[hazard ratio(HR)=6.49,95%CI:3.18-13.24,P＜0.001],while elevated preoperative carcinoembryonic antigen(CEA)(≥5 ng/mL)correlated with shorter OS(HR=1.82,P=0.033).Conclusion:CRC patients with pulmonary metastasis and tumor diameters of 3-5 cm exhibited significantly inferior survival outcomes after RFA compared to the≤3 cm group.A tumor diameter of 3 cm can serve as a critical threshold for selecting RFA indications,and combining preoperative CEA levels can optimize patient stratification.

Objective:To investigate intraoperative pathological findings and the interventional effects of "deep cervical lymphaticovenous anastomosis+" (dcLVA+) on deep cervical lymphatic drainage as well as the blood flow of carotid artery and jugular vein in elderly patients with cognitive impairment, and to put forward the thoughts based on the findings from the surgery.Methods:Between May 2024 and December 2024, retrospective analysis of Microsurgery Hospital, Fengcheng Hospital, Xi'an Medical College performed dcLVA+ between the deep cervical lymphatics or lymph nodes and jugular veins in 50 elderly patients with cognitive impairment (19 males and 31 females, aged 55-88 years with 69.94 years in average). Nine patients were found with Clinical Dementia Rating (CDR) score at 1 (mild), 7 with CDR score at 2 (moderate) and 34 with CDR score at 3 (severe). Intraoperative observations based on literature reviews had identified anatomical relationships between the lymphatic sacs containing cervical lymphatic chain and the carotid sheath. The lymph node count, size, distribution, thickness of fat tissue and conditions of lymphatic vessels were documented. Ultrasound was used to compare the blood flow of carotid artery and jugular vein as well as the cross-sectional areas at the planes of hyoid and cricoid cartilage before and after the closure of incisions under anaesthesia in 39 patients. Correlation analyses for Mini-Mental State Examination (MMSE), Montreal Cognitive Assessment (MoCa), Activities of Daily Living (ADL) and Agitation behavior score before and 1 week after surgery were performed using Spearman's correlation and Wilcoxon paired tests. P<0.05 was considered statistically significant. Postoperative follow-ups were conducted via the visit of outpatient clinic and WeChat and telephone interviews. Results:In surgery, the cervical lymphatic chain was found running within an almost enclosed sac surrounding the carotid sheath. There were enlarged lymph nodes, increased fat deposition, lymphatic dilation or fibrosis in the sac. The preoperative blood flow in the carotid artery at the planes of hyoid and cricoid cartilage in the 39 patients was recorded at 150.52 ml/min±40.33 ml/min and 358.29 ml/min±129.30 ml/min, while that in the jugular vein was at 172.50 ml/min±63.94 ml/min and 317.00 ml/min±105.21 ml/min, respectively, both were far lower than the normal blood flow. There were statistically significant differences in the blood flow of carotid artery and jugular vein before and after surgery ( P<0.01). It was found that the preoperative blood flow of the internal carotid artery at the plane of hyoid was positively correlated with the preoperative scores of MMSE ( P<0.01), MoCa ( P<0.05) and ADL ( P<0.01). The blood flow of the common carotid artery at the plane of cricoid cartilage was found significantly and positively correlated with the preoperative scores of MMSE ( P<0.05). It was also noted that the blood flow of the internal carotid artery at the plane of hyoid was significantly and positively correlated with the postoperative ADL ( P<0.01) but negatively correlated with the Agitation behavior score ( P<0.05). The blood flow of the common carotid artery at the plane of cricoid cartilage was significantly and positively correlated with the postoperative scores of MMSE and MoCa ( P<0.05). The blood flow of the internal jugular vein at the plane of hyoid was negatively correlated with the Agitation behavior score ( P<0.01). The cross-sectional area of carotid artery at the plane of left hyoid was significantly and positively correlated with the MMSE score ( P<0.05). Statistically significant differences were observed in MMSE, MoCa, ADL and Agitation behavior score before and after surgery ( P<0.01). Conclusion:dcLVA+ shows a certain therapeutic benefit to the elderly patients with cognitive impairment. The intraoperatively observed pathological changes in cervical lymphatic sacs affect deep cervical lymphatic drainage and the blood flow of carotid artery and jugular vein. Further studies are necessary to find out whether the findings from this study would be the specific pathological changes and the morbidity mechanisms among the elderly patients with cognitive impairment.

Objective To investigate the clinical efficacy of transurethral plasma electrotomy with rod electrode and end-to-end urethral anastomosis in the treatment of short urethral stricture.Methods 125 male patients with short urethral stricture(＜2 cm)who were admitted to our hospital from January 2014 to December 2020 were retrospectively analyzed.According to different surgical methods,they were divided into transurethral plasma resection with rod electrode(minimally invasive group)and urethral end-to-end anastomosis(open group).According to the length of urethral stricture,the minimally invasive group was divided into minimally invasive group 1(stricture length≤1 cm),minimally invasive group 2(stricture length1-2 cm),open group 1(stricture length ≤1 cm)and open group 2(stricture length 1-2 cm).The four groups were compared with each other,and the surgical success rates were compared between the four groups.Results The success rate of the minimally invasive group 1 and the open group 1 was 88.57％and 93.10％,respectively.There was no significant difference between the two groups(P＞0.05).The surgical success rate of the minimally invasive group 2 and the open group 2 was 67.86％and 90.91％,respectively.The surgical success rate of the minimally invasive group 2 was significantly lower than that of the open group 2.The difference was statistically significant(P＜0.05).The surgical success rate of minimally invasive group 1 and minimally invasive group 2 was 88.57％and 67.86％,respectively,the difference was statistically significant(P＜0.05).The success rate of operation in the open group 1 and the open group 2 was 93.10％and 90.91％,respectively,and there was no significant difference between the two groups(P＞0.05).Conclusion Transurethral plasma resection with rod electrode is preferred for urethral stricture with length≤1 cm,because the success rate of this surgery is the same as that of open surgery,and the surgical trauma is small and the recovery is fast.For 1-2 cm urethral stricture,minimally invasive surgery has less trauma and faster recovery,but open surgery has a higher success rate.The choice of surgical method needs to weigh the advantages and disadvantages and take comprehensive consideration.

Background and Purpose:The early prediction of local tumor progression-free survival(LTPFS)after radiofrequency ablation(RFA)for colorectal cancer(CRC)lung metastases has significant clinical importance.The application of radiomics in the prediction of tumor prognosis has been explored.This study aimed to construct a radiomics-based nomogram for predicting LTPFS after RFA in CRC patients with lung metastases.Methods:This study retrospectively analyzed 172 CRC patients with 401 lung metastases admitted to Department of Interventional Radiology,Fudan University Shanghai Cancer Center from August 2016 to January 2019.This study was reviewed by the medical ethics committee of Fudan University Shanghai Cancer Center(ethics number:2402291-24).After augmentation of pre-ablation and immediate post-ablation computed tomography(CT)images,the target metastases and ablation regions were segmented manually to extract the radiomic features.Maximum relevance and minimum redundancy algorithm(MRMRA)and least absolute shrinkage and selection operator(LASSO)regression models were applied for feature selection.The clinical model,the radiomics model,and the fusion model were constructed based on the selected radiomic features and clinical variables screened by the multivariate analysis.The Harrell concordance index(C-index)and area under receiver operating characteristic(ROC)curves(AUC)were calculated to evaluate the prediction performance.Finally,the corresponding nomogram of the best model was drawn.Results:Among all the lung metastases,102(25.4%)had final recurrence,and 299(74.6%)had complete response(CR).The median follow-up time was 21 months(95%CI:19.466-22.534),and the LTPFS rates at 1,2,and 3 years after RFA were 76.5%(95%CI:72.0-80.4),72.1%(95%CI:66.6-76.9)and 69.9%(95%CI:64.0-75.1).In both the training and test dataset,the fusion model based on the final 12 radiomic features through the LASSO regression and 4 clinical variables screened by multivariate analysis achieved the highest AUC values for LTPFS,with C-index values of 0.890(95%CI:0.854-0.927)and 0.843(95%CI:0.768-0.916),respectively.Conclusion:The fusion model based on radiomic features and clinical variables is feasible for predicting LTPFS after RFA of CRC patients with lung metastases,whose performance is superior to the single radiomic and clinical model.At the same time,the nomogram of the fusion model can intuitively predict the prognosis of CRC patients with lung metastases after RFA,thus assisting clinicians in developing individualized follow-up review plans for patients and adjusting treatment strategies flexibly.