Objective: To make an artificial trachea, which can really healed with native trachea. Methods: 20 dogs are randomized into a pedicle group and a nonpedicle group. 6 cm cervical trachea was resected and replaced with "sandwich" artificial trachea made from memory alloy meshes by two-stage operative procedure. Survival period and stenosis of anastomosis were recorded. Results: Seven dogs in pedicle group survived well and another three were dead. The cause of death was anastomosis stricture in 1 and infection in 2. All dogs in nonpedicle group were dead within four weeks because of stenosis or infection. Conclusion: Two-stage operative pedicle "sandwich" artificial trachea made from memory alloy mesh is up to now the closest artificial trachea to human native trachea. It could be applied clinically.

Objective To evaluate the effectiveness of cryosurgery by using fiber optic bronchoscope for the treatment of middle or late stage central lung cancer.Methods Cryosurgery was performed on 31 patients with middle or late stage central lung cancer,who could not received open surgery,with liquid CO2 by using fiber optic bronchoscope.The effectiveness was monitored.Via the bronchoscope,a cryo-probe was inserted to the center or margin of the tumor.The cryotherapy was persisted for 30 to 120 seconds at-50 to-70 ℃.And then,the tumor was removed before the ice-ball on the point of the probe thawed.The procedure was repeated for several times till the airway was reopened.Results After 1 to 6 times therapies(2.5 times on average),the improve rates of cough,hemoptysis,dyspnea,and chest pain were 74%(23/31),87%(27/31),87%(27/31),and 58%(18/31),respectively.The rates of "markedly effective"and "effective" were 61%(19/31)and 39%(12/31)respectively.The pulmonary function of the patients was also improved:the FEV1 rose from(1.21?0.22)L to(1.72?0.35)L(t=21.843,P=0.001),and the FVC was increased from(1.86?0.31)L to(2.26?0.43)L(t=33.703,P=0.001).Conclusions Cryosurgery by using a fiber optic bronchoscope is an effective and minimally invasive method to reopen the airway,control the obstructive pneumonia,and improve dyspnea and hemoptysis.

Objective To investigate the regularity of intrapulnonary lobar and segmental lymph nodes metastasis in patients with cT1N0M0 stage lung adenocarcinoma.To provide a basis for more accurate determination of N stage and indication for pulmonary segmental resection.Methods A prospective study was performed from March 2014 to December 2015.103 cases of cT1 N0M0 stage lung adenocarcinoma received lobectomy and mediastinal lymph node dissection in the thoracic surgery department of China-Japan Friendship Hospital.Intrapulmonary lobar and segmental lymph nodes were dissected and sorted carefully then sent to the pathological department with the corresponding lung specimen and other lymph nodes.Statistical analysis was carried out considering size of the lesion,imaging features,serum CEA levels,pathological subtypes and so on.Results In total 103 cases,pN0 was confirmed in 82 cases,pN1 in 15 cases,pN1 + N2 in 5 cases,and skipping-pN2 in 1 case.14 cases(93.3％) in pN1 group were detected with station 12-14 lymph node metastasis,while only 5 cases (33.3％) were detected with station 12-14 LSNs metastasis.4 cases(66.7％) in pN2 group were detected with station 12-14 lymph node metastasis,while only 1 case(16.7％) with station 13 and station 7 lymph node metastasis.If LSNs were not detected,the false negative rate of N staging could be as high as 6.1％ (5/82),The rate of missed diagnosis of lymph node metastasis might be 30％ (6/20) to N1 stations alone.41.2％ (7/17)cases with metastasis to the adjacent LSNs had been proved with metastasis to the isolated LSNs.The metastasis rate of the isolated LSNs was significantly lower(P =0.049) in pure GGNs compared with those part-solid/solid nodules.Invasive adenocarcinoma had higher metastasis rate of isolated LSNs,compared with preinvasive lesions or minimally invasive adenocarcinomas,with no statistical difference between groups (P =0.055).No significant difference in isolated LSNs metastasis rate was found between groups with different serum CEA levels(P =0.251) or tumor size(P =0.197).Conclusion Dissection of intrapulmonary lobar and segmental lymph nodes might facilitate a more accurate N stage,reduce the false negative rate of lymph node metastasis,and provide basis for more accurate assessment of prognosis and postoperative adjuvant treatment.The sampling area of lymph nodes during segmental resection should include the adjacent LSNs of the target segment.The isolated LSNs metastasis rate of cT1N0M0 stage lung adenocarcinoma with pureGGN as imaging feature is relative low,which might be suitable for segmentectomy when meeting other criteria.

With the widespread use of multi-slice spiral computed tomography(CT) and the increasing level of diagnosis and treatment,the incidence of pulmonary ground glass opacity(GGO) is increasing.The etiology of GGO is complex and the pathological types are diverse.In addition to benign lesions,GGO can be a specific type of lung adenocarcinoma or its invasive lesions.Some scholars think it is closely related to early lung adenocarcinoma.Histopathology of lung cancer is crucial for the prognosis and treatment of lung cancer.However,under normal circumstances,the pathology of the patient can be known by surgery,bronchoscopy or puncture.However,many patients may not have the pathological conditions for obtaining the pathological specimen.CT as the primary method of diagnosis of lung adenocarcinoma,lung adenocarcinoma in the new classification,based on the lung GGO CT findings to determine its ability to provide a characteristic indicator of tumor histopathology in order to help GGO diagnosis and guidance of clinical treatment.

Objective:To analyze the law of distant metastasis in patients with small lung adenocarcinoma with different CT findings, and to explore the feasibility of different preoperative examination methods for small lung adenocarcinoma with different imaging characteristics.Methods:Clinicopathological data of cT1a-cN0 lung adenocarcinoma patients admitted to the respiratory center of China-Japan Hospital from January 2017 to December 2018 were retrospectively collected. A total number of 785 patients were included, including 289 males and 496 females. SPSS 22.0 was used for statistical analysis.Results:A total number of 785 patients were included in this study, including 287 pure ground-glass nodule (GGN) patients, 111 GGN predominant patients, 221 solid predominant patients and 166 solid nodule patients. Among the included patients, 8 had distant metastasis, including 6 with bone metastasis, 1 with brain metastasis and 1 with brain and adrenal metastasis. No distant metastasis was observed in the patients with pure GGN and GGN predominant nodule, while 1 solid predominant patients had distant metastasis, and 7 patients with solid nodules had distant metastasis. The probability of distant metastasis was 0.5% for the solid predominant patients and 4.2% for the solid nodule patients. Univariate analysis results showed that CEA level ( P=0.030), the largest diameter of the lung window tumor ( P=0.003), the largest diameter of the solid component of the lung window tumor ( P<0.001), the largest area of the lung window tumor ( P=0.002), mediastinal window tumor maximum area ( P<0.001), CTR ( P<0.001), TDR ( P<0.001), and pleural indentation sign ( P=0.037) were risk factors for distant metastases. Multivariate analysis showed that CEA ( OR=1.019, 95% CI: 1.002-1.037, P=0.028) and TDR ( OR=0.000, 95% CI: 0.000-0.310, P=0.001) were independent risk factors of distant metastasis. Conclusion:For patients with pure GGN and GGN predominant nodule, preoperative examination could not be required, but for pure solid nodules, it is necessary to perform relevant preoperative examination including skull MRI before surgery to exclude distant metastasis.

BACKGROUND AND OBJECTIVEApproximately 30% of patients who are diagnosed with non-small cell lung cancer (NSCLC) are classified as N2 on the basis of metastasis to the mediastinal lymph nodes. The effectiveness of surgery for these patients remains controversial. Although surgeries in recent years are proved to be effective to some extent, yet due to many reasons, 5-year survival rate after surgery varies greatly from patient to patient. Thus it is necessary to select patients who have a high probability of being be cured through an operation, who are suitable to receive surgery and the best surgical methods so as to figure out the conditions under which surgical treatment can be chosen and the factors that may influence prognosis.

METHODS165 out of 173 patients with N2 NSCLC were treated with surgery in our department from January 1999 to May 2003, among whom 130 were male, 43 female and the sex ratio was 3:1, average age 53, ranging from 29 to 79. The database covers the patients' complete medical history including the information of their age, sex, location and size of tumor, date of operation, surgical methods, histologic diagnosis, clinical stage, post-operative TNM stage, neoadjuvant treatment and chemoradiotherapy. The methods of clinical stage verification include chest X-ray, chest CT, PET, mediastinoscopy, bronchoscope (+?), brain CT or MRI, abdominal B ultrasound (or CT), and bone ECT. The pathological classification was based on the international standard for lung cancer (UICC 1997). Survival time was analyzed from the operation date to May 2008 with the aid of SPSS (Statistical Package for the Social Sciences) program. Kaplan-Meier survival analysis, Log-rank test and Cox multiplicity were adopted respectively to obtain patients' survival curve, survival rate and the impact possible factors may have on their survival rate.

RESULTSThe median survival time was 22 months, with 3-year survival rate reaching 28.1% and 5-year survival rate reaching 19.0%. Age, sex, different histological classification and postoperative chemoradiotherapy seem to have no correlation with 5-year survival rate. In all N2 subtypes, 5-year survival rate is remarkably higher for unexpected N2 discovered at thoractomy and proven N2 stage before preoperative work-up and receive a mediastinal down-staging after induction therapy (P < 0.01), reaching 30.4% and 27.3% respectively. 5-year survival rate for single station lymph node metastasis were 27.8%, much higher compared with 9.3% for multiple stations (P < 0.001). Induction therapy which downstages proven N2 in 73.3% patients gains them the opportunity of surgery. The 5-year survival rate were 23.6% and 13.0% for patients who had complete resection and those who had incomplete resection (P < 0.001). Patients who underwent lobectomy (23.2%) have higher survival rate, less incidence rate of complication and mortality rate, compared with pneumonectomy (14.8%) (P < 0.01). T4 patients has a 5-year survival rate as low as 11.1%, much less than T1 (31.5%) and T2 (24.3%) patients (P = 0.01). It is noted through Cox analysis that completeness of resection, number of positive lymph node stations and primary T status have significant correlativity with 5-year survival rate.

CONCLUSIONIt is suggested that surgery (lobectomy preferentially) is the best solution for T1 and T2 with primary tumor have not invaded pleura or the distance to carina of trachea no less than 2 cm, unexpected N2 discovered at thoractomy when a complete resection can be applied, and proven N2 discovered during preoperative work-up and is down-staged after induction therapy. Surgical treatment is the best option, lobectomy should be prioritized in operational methods since ise rate of complication and morality are lower than that of pneumonectomy. Patients' survival time will not benefit from surgery if they are with lymph nodes metastasis of multiple stations (Bulky N2 included) and T4 which can be partially removed. Neoadjuvant chemotherapy increases long-term survival rate of those with N2 proven prior to surgery. However, postoperative radiotherapy decreases local recurrence rate but does not contribute to patients' long-term survival rate.

Adult ; Aged ; Carcinoma, Non-Small-Cell Lung ; complications ; mortality ; surgery ; Female ; Humans ; Lung Neoplasms ; complications ; mortality ; surgery ; Lymphatic Metastasis ; pathology ; Male ; Middle Aged ; Survival Analysis ; Thoracic Surgical Procedures ; methods ; Treatment Outcome

Objective To evaluate the value of endobronchial ultrasound-guided transbronchial needle aspiration in the early diagnosis of non-central small cell lung cancer.Methods 141 patients wereselected from July 1999 to June 2017,who were diagnosed with small cell lung cancer (stage N2 and N3).They were divided into two groups according to the approach of obtaining histopathological tissuefor diagnosis.49 cases in the experimental group were obtained by EBUS-TBNA,92 cases in the control group were done by video assisted thoracic surgery (40 cases,43.5％),mediastinoscopy (1 case,1.1％),and open procedure (51 case,55.4％).Survival outcome,time of waiting for the treatment and lengthof stay were analyzed.Results There werel09 males,32 females,the range of age is from 16 to 79 years old [(56.21 ± 11.48) years].62 lesions located in the upper lobe,12 in the middle lobe,56 in the lower lobe,11 in the middle-lower/-upper lobes.Considering the T stage,there are 7 cases of T1,61 cases of T2,45 cases of T3,and 26cases of T4,2 patients with Tx stage.Compared with conventional approach,EBUS-TBNA saved 10.78 days from admission to the time of receiving treatment [(4.62 ± 0.66)days vs.(15.40 ± 1.61) days,P ＜ 0.05],and saved 18.13 days of length of stay [(5.30 ± 0.76) days vs.(23.43 ± 2.44) days,P ＜0.05].5-year survival rate was 31.0％ for traditional group and 27.5％ for EBUS-TBNA group,there was no significant difference between two groups(P =0.308).Conclusion EBUS-TBNA couldsave the waiting days from admission to the time of receiving treatment,and also shorten the total length of stay.EBUS-TBNA was more efficient than conventional approaches (VATS,mediastinoscopy or open procedure) for diagnosing non-central small cell lung cancer with enlarged mediastinal lymph nodes.

Objective:The study aimed was to explore the safety and efficacy of neoadjuvant immunochemotherapy for non-small cell lung cancer (NSCLC).Methods:We retrospectively collected data of all patients who received neoadjuvant immunochemotherapy and chemotherapy for NSCLC followed by surgery in our unit between January 2019 to September 2021.Results:Forty-four patients were diagnosed with NSCLC in a stageⅠ(2 cases), ⅡA(7 cases), ⅡB(11 cases), ⅢA (15 cases), ⅢB (1 case). The average age was 63 years old(range 44-71 years old). Squamous cell carcinoma accounted for 65.91% of all patients. Central lung cancer accounted for the vast majority, with 39 patients (88.64%). There were 19 cases in the neoadjuvant immunochemotherapy group and 25 cases in the neoadjuvant chemotherapy group; the average interval between the end of neoadjuvant therapy and the day of operation was 34 days, including( 33.74±10.66 )days in the immunochemotherapy group and (33.88±11.9) days in the chemotherapy group, and there was no significant difference between the two groups. No grade 3 or more adverse events occurred in all patients. There were 13 cases (63.16%) reached PR (partial response)+ CR (complete response) according to the Response Evaluation Criteria in Solid Tumors (RECIST v. 1.1) in the neoadjuvant immunity group and 11 cases (44.00%) in the neoadjuvant chemotherapy group. There was no significant difference between the two groups. In the neoadjuvant immunochemotherapy group, 9 cases (47.37%) achieved down-staging, In the neoadjuvant chemotherapy group, 8 cases (32.00%) achieved down-staging, there was no significant difference between the two groups. Seven patients (36.84%) in neoadjuvant immunochemotherapy group showed pCR (pathologic complete remission), but there were no patients who reached pCR in the neoadjuvant chemotherapy group., the difference was statistically significant ( P=0.001). Four patients (21.05%) in the neoadjuvant immunochemotherapy group reached mPR (major pathologic response), 6 patients (24.00%) in the neoadjuvant chemotherapy group reached mPR, and the difference was no statistically significant( P= 0.817). Conclusion:The safety of neoadjuvant immunochemotherapy was satisfactory; Compared with neoadjuvant chemotherapy, neoadjuvant immunochemotherapy did not increase the preoperative grade 3 adverse events and prolong the waiting time before operation; neoadjuvant immunochemotherapy had obvious advantages in pCR, which provided the possibility for the cure of tumor.

Objective:To evaluate the predictive value of stair climbing test combined with arterial blood gas analysis on postoperative complications in lung cancer patients with limited pulmonary function.Methods:A total of 1 231 hospitalized lung cancer patients with limited pulmonary function dating from August 2012 to August 2020 were retrospectively reviewed. Included in the cohort were 766 of patients who underwent stair climbing test(SCT) preoperatively and completed data collection. Patients were grouped according to their general condition, past medical history, surgical approach, pulmonary function test(PFT) and SCT results. Comparison of the postoperative cardiopulmonary complication rates were made between different groups, and independent risk factors were identified.Results:A total of 182 cardiopulmonary-related complications occurred in 144 cases, accounting for 18.8% of the entire cohort. Perioperative mortality rate was 0.9%(7/766). The rate of postoperative cardiopulmonary complications was significantly different between the groups stratified by gender, age, smoking index, PFT index(FEV1%, DLCO%), SCT results(height achieved, speed, changes in heart rate and oxygen saturation of the arteries before and after the test), ASA score, surgical approach(VATS/Open), resection range(Lobectomy/Sublobectomy), anesthetic duration, blood loss volume, etc. Logistic regression analysis showed that only height achieved( P<0.001), changes in heart rate( P<0.001), changes in oxygen saturation of the arteries( P=0.001), resection range( P=0.006) and anesthetic duration( P=0.025) were independent risk factors for cardiopulmonary-related complications in lung cancer patients with limited pulmonary function. Conclusion:The stair climbing test combined with arterial blood gas analysis could be used as a preoperative screening method for lung cancer patients with limited lung function and may have a predictive value for postoperative cardiopulmonary-related complications.

The RET(REarranged during transfection) gene as a novel has broken the therapeutic deadlock in the last two years, whith is attributed to the rapid approval of targeted therapies and inclusion in treatment guidelines, bringing more hope for the survival of patients with non-small cell lung cancer(NSCLC). Usually, the main activation of the RET proto-oncogene contributes to the development of lung cancer via somatic rearrangements. Thus, this study reviews the biological characteristics of RET gene, the classification of RET fusion in lung cancer and the detection of RET fusion. Meanwhile the pathological and clinical features, targeted therapies, drug resistance, prognosis of lung cancer patients with RET fusion were further discussed.