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OBJECTIVES: Sublobar resections for lung cancer are increasing worldwide. However, the prognostic significance of weight loss after sublobar resection remains unclear. We aimed to investigate the prognostic significance of weight loss after sublobar resection for lung cancer. METHODS: Patients who underwent sublobar resection for non-small cell lung cancer between January 2016 and June 2021 were analysed. The percentage weight change at 3, 6, and 12 months postoperatively was determined based on the preoperative weight. Patients were divided into two groups: those with or without weight loss ≥ 5%, referring to the diagnostic criteria for frailty, to assess prognosis. Subsequently, the prognosis-related timing of weight loss ≥ 5% and its risk factors were analyzed. RESULTS: We reviewed 147 patients; 39 (26.5%) showed weight loss ≥ 5% within 1-year post-surgery. A total of 32 patients (21.8%) died, 13 from primary lung cancer and 19 from non-lung cancer causes. Cancer recurrence occurred in 22 patients (15.0%). Weight loss ≥ 5% within 1-year post-surgery was a poor prognostic factor for overall and recurrence-free survival (log-rank; p = 0.014 and 0.018, respectively). Additionally, weight loss ≥ 5% at 6-12 months postoperatively was associated with poor overall and recurrence-free survival (p < 0.05, both). In the multivariable analysis, an age-adjusted Charlson comorbidity index ≥ 4 was a predictive factor for weight loss ≥ 5% at 6-12 months postoperatively (odds ratio, 3.920; p = 0.023). CONCLUSIONS: Weight loss ≥ 5% at 6-12 months postoperatively was associated with poor prognosis. Long-term nutritional management is important in the treatment plan of sublobar resection in high-risk patients.

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BACKGROUND: Distant metastases of ovarian cancer are rarely detected alone. The effectiveness of surgical intervention for pulmonary metastases from ovarian cancer remains uncertain. This study aimed to investigate the clinicopathologic characteristics and outcomes of patients undergoing resection for pulmonary metastasis from ovarian cancer. CASE PRESENTATION: The clinicopathologic characteristics and outcomes of radical surgery for pulmonary metastasis from ovarian cancer were investigated. Out of 537 patients who underwent pulmonary metastasis resection at two affiliated hospitals between 2010 and 2021, four (0.74%) patients who underwent radical surgery for pulmonary metastasis from ovarian cancer were included. The patients were aged 67, 47, 21, and 59 years; the intervals from primary surgery to detection of pulmonary metastasis from ovarian cancer were 94, 21, 36, and 50 months; and the overall survival times after pulmonary metastasectomy were 53, 50, 94, and 34 months, respectively. Three of the four patients experienced recurrence after pulmonary metastasectomy. Further, preoperative carbohydrate antigen (CA) 125 levels were normal in two surviving patients and elevated in the two deceased patients. CONCLUSION: In this study, three of the four patients experienced recurrence after pulmonary metastasectomy, but all patients survived for > 30 months after surgery. Patients with ovarian cancer and elevated CA125 levels may not be optimal candidates for pulmonary metastasectomy. To establish appropriate criteria for pulmonary metastasectomy in patients with ovarian cancer, further research on a larger patient cohort is warranted.

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OBJECTIVE: This retrospective cohort study aimed to explore the surgical outcomes and prognostic factors of resection of pulmonary metastases (PM) from colorectal cancer (CRC). METHODS: Overall, 60 patients who underwent resection of PM from CRC between 2015 and 2021 at two institutions were reviewed. The primary outcome were overall survival (OS) and early recurrence after PM resection. The association between OS and right-sided colon cancer (RCC) was investigated. Early recurrence after PM resection was defined as recurrence within one year. RESULTS: The 5-year OS after CRC resection was 83.8% (95% confidence interval [CI] 67.5-92.4) and after PM resection was 69.4% (95% CI 47.5-83.6). In total, 25 patients had recurrence after PM resection (16 within 1 year and 9 after 1 year). In multivariable analysis for OS, RCC (hazard ratio [HR] 4.370, 95% CI 1.020-18.73; p = 0.047) and early recurrence after resection of PM (HR 17.23, 95% CI 2.685-110.6; p = 0.003) were risk factors for poor OS. In multivariable analysis for early recurrence after PM resection, higher value of carcinoembryonic antigen (CEA) (> 5.0 mg/dL) before PM resection was a risk factor for early recurrence (HR 3.275, 95% CI 1.092-9.821; p = 0.034). CONCLUSION: The RCC and early recurrence after PM resection were poor prognosis factors of OS. Higher value of CEA before PM resection was an independent risk factor for early recurrence after resection of PM. Comparitive study between surgery and nonsurgery is necessary in patients with higher CEA values.

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The right middle lobe often poorly expands after right upper lobectomy. Postoperative pulmonary function may be inferior after right upper lobectomy than after right lower lobectomy due to poor expansion of the middle lobe. This study examined the difference in the postoperative right middle lobe expansion and pulmonary function between right upper and right lower lobectomy. Patients who underwent right upper or right lower lobectomy through video-assisted thoracic surgery (n = 82) were enrolled in this retrospective study. Pulmonary function tests and computed tomography were performed preoperatively and at 1 year postoperatively. Using three-dimensional computed tomography volumetry, the preoperative and postoperative lung volumes were measured, and the predicted postoperative forced expiratory volume in 1 s was calculated. Middle lobe volume ratio (i.e., ratio of the postoperative to the preoperative middle lobe volume) and the postoperative forced expiratory volume in 1 s ratio (i.e., ratio of the measured to the predicted postoperative forced expiratory volume in 1 s) were compared between right upper and right lower lobectomy. Compared with the patients who underwent right upper lobectomy (n = 50), those who underwent right lower lobectomy (n = 32) had significantly higher middle lobe volume ratio (1.15 ± 0.32 vs. 1.63 ± 0.52, p < 0.001) and postoperative forced expiratory volume in 1 s ratio (1.12 ± 0.12 vs. 1.19 ± 0.13, p = 0.010). The right middle lobe showed more expansion and better recovery of postoperative pulmonary function after right lower lobectomy than after right upper lobectomy.

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OBJECTIVE: A chest tube is usually placed in patients undergoing general thoracic surgery. Although the barbed suture method has been introduced for chest tube wound closure, its superiority to the conventional suture methods for drain management remains unclear. The study aimed to determine whether the barbed suture method could reduce drain-related adverse events compared to the conventional method. METHODS: We retrospectively reviewed the medical records of patients who underwent general thoracic surgery between January 2021 and December 2022, 1 year before and after the introduction of the barbed suture method at our institution. Patients who underwent the barbed suture or conventional method were included. Univariate and multivariate analyses of drain-related adverse events were performed. RESULTS: Of the 250 participants, 110 and 140 underwent the barbed suture method and conventional suture method, respectively. The univariate analysis showed that a higher body mass index, preoperative malignant diagnosis, lobectomy, longer operative time, larger tube size, longer chest drainage duration, surgical complications, and conventional method were risk factors for drain-related adverse events. The multivariate analysis showed that the barbed suture method was a protective factor against drain-related adverse events (odds ratio 0.267; 95% confidence interval 0.103-0.691; P = 0.007). CONCLUSIONS: The barbed suture method could reduce drain-related adverse events compared to the conventional method. Therefore, it might be a potential standard method for chest tube wound closure in patients undergoing general thoracic surgery.

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INTRODUCTION: We analyzed the association between postoperative weight loss (WL), preoperative body mass index (BMI), and prognosis in patients with lung cancer who underwent lobectomy using minimally invasive approaches. METHODS: Weight change in 325 patients who underwent radical lobectomy for non-small cell lung cancer was assessed at 3, 6, and 12 months postoperatively and compared to preoperative weight. Patients were divided into three groups according to their preoperative BMI interquartile range: low BMI ≤20.3 kg/m2 , middle BMI 20.4-24.4 kg/m2 , and high BMI ≥24.5 kg/m2 . Postoperative WL ≥5% was evaluated with reference to frailty. RESULTS: There were no significant differences in pathological findings, postoperative complications, or postoperative hospital stay among the three groups. Thirty all-cause deaths and 39 cancer recurrences occurred. Within the first year after surgery, WL of any grade was observed in 229 patients (70.5%) and WL ≥5% in 86 patients (26.5%). Postoperative WL of any grade within 1 year after surgery was not associated with OS and RFS (both p > .05). However, WL ≥5% within 1 year after surgery was associated with worse OS and RFS (p = .007 and .006, respectively). WL ≥5% within 1 year after surgery was more common in the low BMI group (p = .045). There was no difference in OS and RFS among the BMI groups in patients with WL ≥5% and those without WL ≥5% (all p > .05). CONCLUSION: WL ≥5% was associated with poor prognosis after lobectomy via minimally invasive approaches. Weighing is a useful prognostic marker that can be easily self-checked.

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BACKGROUND: Metastatic lung tumors rarely present with cystic formations. This is the first report of multiple cystic formations in pulmonary metastases from mucinous borderline ovarian tumors written in English. CASE PRESENTATION: A 41-year-old woman underwent left adnexectomy + partial omentectomy + para-aortic lymphadenectomy for a left ovarian tumor 4 years ago. The pathological finding was mucinous borderline ovarian tumor with a microinvasion. A chest computed tomography performed 3 years after surgery revealed multiple cystic lesions in both lungs. After 1-year follow-up, the cysts increased in size and wall thickness. Subsequently, she was referred to our department with multiple cystic lesions in both lungs. No laboratory findings indicated infectious diseases or autoimmune disorders that could cause cystic lesions in both lungs. Positron emission tomography showed slight accumulation in the cyst wall. Partial resection of the left lower lobe was performed to confirm the pathological diagnosis. The diagnosis was consistent with pulmonary metastases from a previous mucinous borderline ovarian tumor. CONCLUSIONS: This is a rare case of lung metastases from a mucinous borderline ovarian tumor presenting with multiple lesions with cystic formation. Pulmonary cystic formations in patients with a borderline ovarian tumor should be considered as possible pulmonary metastases.

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OBJECTIVE: This study evaluated the feasibility of performing non-intubated video-assisted thoracoscopic surgery (VATS) with local anesthesia for parapneumonic effusion and empyema resistant to conservative treatment. METHODS: We retrospectively reviewed 80 patients who underwent surgery for parapneumonic effusions and empyema between 2015 and 2021. Patients were divided into those who received non-intubated local anesthesia and general anesthesia during surgery. Patient demographics, characteristics, laboratory findings, treatment progress, and treatment outcomes were compared. The primary outcomes were duration of postoperative drainage, postoperative complication rate, and postoperative mortality rate within 30 days. RESULTS: Among patients who received local (n = 21) and general anesthesia (n = 59), there was a significant difference in age (median 79.0 years [interquartile range (IQR) 77.0-80.0] vs. 68.0 years [IQR 54.5-77.5]; p < 0.001), preoperative performance status (3.0 [IQR 2.0-4.0] vs. 2.0 [IQR 1.0-3.0]; p < 0.001), and operative time (69 min [IQR 50-128] vs. 150 min [IQR 107-198]; p < 0.001) but not in preoperative white blood cell count (12,100/µL [IQR 8,400-18000] vs. 12,220/µL [IQR 8,950-16,724]; p = 0.840), C-reactive protein (15.2 mg/dL [8.8-21.3] vs. 17.9 mg/dL [IQR 9.5-23.6]; p = 0.623), postoperative drainage period (11 days [IQR 7-14] vs. 9 days [7-13]; p = 0.216), postoperative hospital stay (22 days [IQR 16-53] vs. 18 days [IQR 12-26]; p = 0.094), reoperation rate (9.5% vs. 15.3%; p = 0.775), postoperative complication rate (19.0% vs. 18.6%; p = 0.132), or postoperative 30-day mortality rate (4.8% vs. 0%; p = 0.587). CONCLUSIONS: VATS using local anesthesia is feasible for patients with treatment-resistant parapneumonic effusion and empyema with poor general condition.

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OBJECTIVES: This study examined whether a resected lung lobe can affect the accuracy of postoperative forced expiratory volume in 1 s (FEV1) predicted using the subsegment counting method and three-dimensional computed tomography (3D-CT) volumetry. METHODS: Overall, 125 patients who underwent lobectomy through video-assisted thoracic surgery were enrolled in this retrospective study. Pulmonary function tests were performed preoperatively and postoperatively at 3 months. We defined the accuracy index as the ratio of predicted postoperative FEV1 to measured postoperative FEV1 and compared the accuracy index of the subsegment counting method and 3D-CT volumetry. Factors affecting the accuracy index were also examined. RESULTS: The accuracy index of the subsegment counting method was 0.94 ± 0.12, versus 0.93 ± 0.11 for 3D-CT volumetry (P = 0.539). There was a significant difference among the resected lobes in the accuracy index of the subsegment counting method (P < 0.001) but not in that of 3D-CT volumetry (P = 0.370). The resected lobe, the number of staples used for interlobar dissection and interstitial pneumonia were significantly associated with the accuracy index of the subsegment counting method (all P < 0.001). The number of staples and interstitial pneumonia were significantly associated with the accuracy index of 3D-CT volumetry (P < 0.001, respectively), whereas the resected lobe was not a significant factor (P = 0.240). CONCLUSIONS: The resected lobe affected the accuracy of the subsegment counting method but not that of 3D-CT volumetry. Furthermore, 3D-CT volumetry predicted postoperative FEV1 independent of the resected lobe.

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OBJECTIVES: Weight assessment is an easy-to-understand method of health checkup. The present study investigated the association between weight loss (WL) after lung cancer (LC) surgery and short-mid-term prognosis. METHODS: The data of patients who underwent radical lobectomy for primary LC were assessed between December 2017 and June 2021. Percentage weight gain or loss was determined at 3, 6 and 12 months postoperatively based on preoperative weight. The timing of decreased weight was divided into 0-3, 3-6 and 6-12 months. We also evaluated the relationship between severe WL (SWL) and prognosis. RESULTS: We reviewed 269 patients, of whom 187 (69.5%) showed WL within 1 year after surgery. The interquartile range for maximal WL was 2.0-8.2% (median 4.0%). Furthermore, we defined SWL as WL ≥8%. Twenty-five patients (9.3%) died: 9 from primary LC and 16 from non-LC causes. Cancer recurrences occurred in 45 patients (16.7%). WL occurred from 6 to 12 months postoperatively was associated with poor overall survival and recurrence-free survival (P < 0.05, both). Body mass index <18.5 kg/m2 and idiopathic pulmonary fibrosis were predictive factors (P < 0.05, all). In the SWL group, overall survival, recurrence-free survival and non-cancer-specific were worse (P = 0.001, 0.005 and 0.019, respectively). Age ≥70 years and severe postoperative complications were predictive factors for SWL (P < 0.05, all). CONCLUSIONS: WL from 6 to 12 months postoperatively and SWL were associated with poor prognosis. Ongoing nutritional management is important to prevent life-threatening WL in patients with predictive factors.

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Esophagobronchial fistula (EBF) formation is a severe complication of advanced thoracic malignancies, that affects the prognosis and quality of life of patients. This study reports the case of an 80-year-old man with advanced esophageal cancer, complicated by EBF formation in the left main bronchus proximal to the carina following chemoradiation therapy. A fully covered stent was placed in the left main bronchus but was dislocated on the oral side. The attempt to place a partially covered self-expandable metallic stent (SEMS) also failed due to stent dislocation on the oral side. To avoid stent dislocation, a partially covered SEMS with a length of 40 mm and a diameter of 16 mm was placed to cover the EBF in the left main bronchus. Then, a silicone Y stent (16 × 13 × 13 mm in outer diameter) was inserted to support the SEMS from the inside. After placing the SEMS and Y stent, the position of the SEMS was stabilized. The patient remained stable with adequate oral intake.

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BACKGROUND: Some recent reports have described the usefulness of thoracic aortic stent grafts to facilitate en bloc resection of tumors invading the aortic wall. We report on malignant peripheral nerve sheath tumor resection in the left superior mediastinum of a 16-year-old man with neurofibromatosis type 1. The pathological margin was positive at the time of the first tumor resection, and radiation therapy was added to the same site. After that, a local recurrence occurred. The tumor was in wide contact with the left common carotid and subclavian arteries and was suspected of infiltration. After stent graft placement of these arteries to avoid fatal bleeding and cerebral ischemia by clamping these arteries and bypass procedure, we successfully resected the tumor without any complications. CONCLUSION: s. Here, we report the usefulness of the prior covered stent placement to aortic branch vessels for the resection of invasive tumor.

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OBJECTIVES: Difficult thoracoscopic surgery sometimes requires a long operative time. It is unclear whether patients benefit from such thoracoscopic surgeries. We investigated whether thoracoscopic surgery for difficult cases contributed to improvements in perioperative outcomes. METHODS: We retrospectively reviewed cases of anatomical lung resection with thoracoscopic surgery, including conversion to thoracotomy, between January 2006 and December 2016 and compared patient demographics and perioperative outcomes of the long (≥360 min) and the normal operative time groups (<360 min). RESULTS: One hundred and seventy-six patients were in the long operative time group and 655 patients were in the normal operative time group. The long operative time group had more male patients, more progressive clinical stages, bilobectomy or pneumonectomy, conversion to thoracotomy and more blood loss than the normal operative time group. The long operative time group had higher rates of postoperative complications and longer hospital stay (30% vs 16%, P < 0.001 and 9 ± 9 days vs 7 ± 8 days, P < 0.001; respectively). Multivariate analysis showed that in the first half of the operative period, chronic obstructive pulmonary disease and bilobectomy or pneumonectomy were independent predictive factors for postoperative complications. The long operative time as a factor was close to statistical significance (odds ratio 1.689, P = 0.079) unlike the elective conversion to thoracotomy (odds ratio 0.784, P = 0.667) and emergency conversion to thoracotomy (odds ratio 0.938, P = 0.924). CONCLUSIONS: In conclusion, when difficult cases are encountered, conversion to thoracotomy should be considered by surgeons if continuation of thoracoscopic surgery increases the operative time.

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BACKGROUND: The present study evaluated the impact of the introduction of thoracoscopic lung lobectomy (TL) for non-small cell lung cancer at our institution. METHODS: This study retrospectively compared surgical and oncological outcomes in the period before and after the introduction of TL for non-small cell lung cancer. Propensity score-matched analysis was performed with respect to baseline patient variables and tumor characteristics. RESULTS: Patients were divided into two groups: those who underwent lung lobectomy in the period before (BI group, n=261) and after (AI group, n=261) the introduction of TL. The proportion of TLs at our institution increased from 1.3% in the BI group to 93% in the AI group. The AI group experienced a longer duration of surgery, lesser intraoperative blood loss, and a significantly shorter postoperative hospital stay (POHS). There were no significant differences in postoperative complications between the two groups. The median follow-up period was 50 months in both groups. No significant differences were observed between the BI and AI groups with respect to 5-year overall survival (OS) (76.1% and 71.7%, respectively; P=0.1973) and disease-free survival (DFS) (67.6% and 66.1%, respectively; P=0.4071). On multivariate analysis, pathological N1-2 status was an independent predictor of survival. AI group and TL showed no independent association with survival. CONCLUSIONS: The introduction of TL represented a positive change at our institution owing to decreased invasiveness and oncological equivalence of the surgical treatment for non-small cell lung cancer.

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Purpose: Higher serum 25-hydroxyvitamin D (25(OH)D) levels are reportedly associated with better survival in early-stage non-small cell lung cancer (NSCLC). Therefore, whether vitamin D supplementation can improve the prognosis of patients with NSCLC was examined (UMIN000001869).Patients and Methods: A randomized, double-blind trial comparing vitamin D supplements (1,200 IU/day) with placebo for 1 year after operation was conducted. The primary and secondary outcomes were relapse-free survival (RFS) and overall survival (OS), respectively. Prespecified subgroup analyses were performed with stratification by stage (early vs. advanced), pathology (adenocarcinoma vs. others), and 25(OH)D levels (low, <20 ng/mL vs. high, ≥20 ng/mL). Polymorphisms of vitamin D receptor (VDR) and vitamin D-binding protein (DBP) and survival were also examined.Results: Patients with NSCLC (n = 155) were randomly assigned to receive vitamin D (n = 77) or placebo (n = 78) and followed for a median of 3.3 years. Relapse and death occurred in 40 (28%) and 24 (17%) patients, respectively. In the total study population, no significant difference in either RFS or OS was seen with vitamin D compared with the placebo group. However, by restricting the analysis to the subgroup with early-stage adenocarcinoma with low 25(OH)D, the vitamin D group showed significantly better 5-year RFS (86% vs. 50%, P = 0.04) and OS (91% vs. 48%, P = 0.02) than the placebo group. Among the examined polymorphisms, DBP1 (rs7041) TT and CDX2 (rs11568820) AA/AG genotypes were markers of better prognosis, even with multivariate adjustment.Conclusions: In patients with NSCLC, vitamin D supplementation may improve survival of patients with early-stage lung adenocarcinoma with lower 25(OH)D levels. Clin Cancer Res; 24(17); 4089-97. ©2018 AACR.

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An 84-year-old woman was referred to our institution with suspected right lung cancer. Subsequently, she underwent thoracoscopic right lower lobectomy without mediastinal lymph node dissection. Postoperatively, she complained of dyspnea and developed arterial oxygen desaturation after 12 h and acute respiratory failure (ARF). An emergency chest computed tomography revealed the right upper bronchial stenosis with hilar peribronchovascular soft tissue edema because the middle lung lobe had been pushed upward and forward and the right upper lung lobe had twisted dorsally. Emergency bronchoscopy revealed severe right upper bronchial stenosis with an eccentric rotation and severe edema. The bronchia stenosis was successfully treated with glucocorticoids and noninvasive positive pressure ventilation for ARF.

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OBJECTIVES: For the purpose of simulating thoracoscopic surgery, we have conducted stepwise development of a life-like chest model including thorax and intrathoracic organs. METHODS: First, CT data of the human chest were obtained. First-generation model: based on the CT data, each component of the chest was made from a 3D printer. A hard resin was used for the bony thorax and a rubber-like resin for the vessels and bronchi. Lung parenchyma, muscles and skin were not created. Second-generation model: in addition to the 3D printer, a cast moulding method was used. Each part was casted using a 3D printed master and then assembled. The vasculature and bronchi were casted using silicon resin. The lung parenchyma and mediastinum organs were casted using urethane foam. Chest wall and bony thorax were also casted using a silicon resin. Third-generation model: foamed polyvinyl alcohol (PVA) was newly developed and casted onto the lung parenchyma. The vasculature and bronchi were developed using a soft resin. A PVA plate was made as the mediastinum, and all were combined. RESULTS: The first-generation model showed real distribution of the vasculature and bronchi; it enabled an understanding of the anatomy within the lung. The second-generation model is a total chest dry model, which enabled observation of the total anatomy of the organs and thorax. The third-generation model is a wet organ model. It allowed for realistic simulation of surgical procedures, such as cutting, suturing, stapling and energy device use. This single-use model achieved realistic simulation of thoracoscopic surgery. CONCLUSIONS: As the generation advances, the model provides a more realistic simulation of thoracoscopic surgery. Further improvement of the model is needed.

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