Long-Term Survival After Video-Assisted Thoracic Surgery Lobectomy for Primary Lung Cancer

Transcription

1 Long-Term Survival After Video-Assisted Thoracic Surgery Lobectomy for Primary Lung Cancer Kazumichi Yamamoto, MD, Akihiro Ohsumi, MD, Fumitsugu Kojima, MD, Naoko Imanishi, MD, Katsunari Matsuoka, MD, Mitsuhiro Ueda, MD, and Yoshihiro Miyamoto, MD Department of Thoracic Surgery, National Hospital Organization Himeji Medical Center, Himeji, and Department of Thoracic Surgery, National Hospital Organization Nagara Medical Center, Nagara, Japan Background. Despite its feasibility and safety, use of video-assisted thoracic surgery (VATS) lobectomy for malignancies has spread slowly during the past decade because no definitive conclusions have been reached regarding the oncologic validity of this approach for malignancies. Thus, the purpose of this study was to analyze the indications and long-term results of VATS major pulmonary resections for primary lung cancers. Methods. Of 502 patients who had surgical resections for primary lung cancers at the National Hospital Organization Himeji Medical Center from May 2000 to December 2003, the cases of the 325 patients who were originally scheduled for VATS major pulmonary resections (pneumonectomy, bilobectomy, lobectomy, and segmentectomy) were retrospectively reviewed. At this hospital, after an initial learning-curve period, indications for VATS were extended to all cases for which this approach was thought possible. For better analysis of long-term survival rates, patients whose follow-up periods were more than 5 years after surgery were analyzed. Results. Of the 325 scheduled VATS resections, 21 procedures (6.4%) were eventually converted to open thoracotomies. In-hospital death occurred in 1 patient (0.3%). The average follow-up period for all censored cases was 66 months. Overall and disease-free 5-year survival rates were 85% and 83% for stage Ia (192 cases), 69% and 64% for stage Ib (50 cases), 48% and 37% for stage II (27 cases), and 29% and 19% for stage III (50 cases), respectively (p < ). Patients who were operated on using the VATS approach increased year by year, especially after 2002, when indications for using this method were extended (ratio of VATS to total cases, approximately 50% in the first 2 years and more than 80% in the latter 2 years). Long-term survival rates during the entire study period were comparable, especially in early stage lung cancer cases. Conclusions. Use of VATS major pulmonary resection for primary lung cancer is feasible, with long-term patient survival comparable to that of conventional thoracotomy. Thus, it is possible that this approach might become the standard in experienced surgical centers, especially for early stage lung cancer cases. Further investigation at multiple centers is required. (Ann Thorac Surg 2010;89:353 9) 2010 by The Society of Thoracic Surgeons Since the first series of lobectomies using videoassisted thoracic surgery (VATS) for primary lung cancer were reported in the early 1990s [1 3], several authors have reported on the feasibility and safety of this procedure [4, 5]. Nevertheless, despite these recommendations, VATS lobectomy has not been widely accepted as a surgical solution. In fact, worldwide only 20% of all lobectomies performed annually are done thoracoscopically [6]. This is partly because no definitive conclusion has been reached regarding the oncologic validity of this approach for malignancies. Several authors have reported on the long-term results for VATS lobectomy [7 10]. However, most of these reports were for small numbers of highly selective (early stage lung cancer) cases. Thus, it remains Accepted for publication Oct 13, Address correspondence to Dr Yamamoto, Department of Bioartificial Organs, Institute for Frontier Medical Sciences, Kyoto University, 53 Kawahara-cho, Sakyo-ku, Kyoto, , Japan; granada@d3.dion.ne.jp. unclear whether this approach is truly equivalent oncologically to conventional thoracotomy. We began our VATS lobectomy program in 2000 for selected stage I primary lung cancers. After an initial learning-curve experience with the procedure, we adopted this approach almost routinely for all cases in which we believed the quality of outcome would be equal to that of a conventional approach. Between 2000 and 2003, a total of 325 patients were scheduled for VATS major pulmonary resections for primary lung cancers at our facility. Each of these patients was followed up and analyzed at least 5 years after surgery. Furthermore, the indications and long-term survival rates of patients were compared by year to estimate the difference in outcomes among the surgical resections performed during and after our learning-curve period. Thus, the purpose of this study was to analyze the clinical circumstances, characteristics, and long-term results for VATS major pulmonary resections for primary lung cancers to estimate the oncologic validity of this approach by The Society of Thoracic Surgeons /10/$36.00 Published by Elsevier Inc doi: /j.athoracsur

2 354 YAMAMOTO ET AL Ann Thorac Surg LONG-TERM SURVIVAL AFTER VATS FOR LUNG CANCER 2010;89:353 9 Table 1. Type of Procedure Type of Resection No. VATS 304 Pneumonectomy 4 Bilobectomy 11 Lobectomy 262 Segmentectomy 27 Conversion 21 Bilobectomy 1 Lobectomy 20 Thoracotomy 152 Pneumonectomy 13 Lobectomy 78 Bilobectomy 1 Segmentectomy 13 Bronchoplasty 47 Wedge resection 20 VATS 13 Thoracotomy 7 Exploratory 5 VATS video-assisted thoracic surgery. Patients and Methods Patients Of the 502 patients who underwent surgical resections for primary lung cancers at the National Hospital Organization Himeji Medical Center from May 2000 to December 2003, records indicated that VATS major pulmonary resection (pneumonectomy, bilobectomy, lobectomy, and segmentectomy) was scheduled for a total of 325 patients; these patients were reviewed retrospectively. Cases of wedge resection and exploratory thoracotomy were excluded from the study. Data were collected from hospital charts, referring physicians, or the patients families. The protocol for this retrospective study was approved by our institutional ethics committee. Consent from patients was waived because individual patients were not identified. Indication Criteria Preoperative assessment was the same as that for open thoracotomy. Each patient was staged with a preoperative chest radiograph, thoracic computed tomography scan, brain magnetic resonance imaging, and bone Table 2. Distributions of Video-Assisted Thoracic Surgery and Thoracotomy Year VATS (Conversion) Thoracotomy VATS/Total (5) 42 48% (3) 65 54% (7) 22 80% (6) 23 86% Total 325 (21) % VATS video-assisted thoracic surgery. Table 3. Reasons for Thoracotomy Reason Total Technical Bronchoplasty Possible bronchoplasty Chest-wall resection Organ involvement Concomitant empyema For palpitation Previous thoracotomy Obliteration of the pleural cavity Pneumonectomy Median sternotomy Impossible unilateral ventilation Desire of the patient Oncologic Tumor size Positive mediastinal lymph node Invasion to the other lobe Pleural dissemination Unknown Total scintigraphy. Patients assessed later in the series also underwent positron emission tomography scan if necessary. Mediastinoscopy was not performed routinely. All patients diagnosed with stage I and II lung cancers were surgical candidates. Surgery was also indicated for most patients with T3 or T4 disease without mediastinal lymph node involvement. In patients with mediastinal lymph node involvement, surgery was indicated after induction chemotherapy if a reduction in stage was achieved. We began performing VATS major pulmonary resection for primary lung cancer in May During the initial learning period, VATS major pulmonary resection was indicated only for patients with stage I disease without complete obliteration of the pleural cavity on preoperative chest films. After the early phase of the learning curve (around 2002), we came to believe that it was possible to maintain the same surgical quality with VATS as with open thoracotomy, and we extended our criteria to all patients in whom we thought it possible to perform the VATS approach successfully. At present, obliteration of the pleural cavity, incomplete fissure, or tumor size is not a contraindication for the VATS approach; central tumors requiring bronchoplasty or angioplasty are currently the main reasons for selecting open thoracotomy. Cases were classified as a conversion if any dissection was performed before the decision was made to proceed with thoracotomy instead of VATS. Observation alone through the thoracoscope was not classified as a conversion.

3 Ann Thorac Surg YAMAMOTO ET AL 2010;89:353 9 LONG-TERM SURVIVAL AFTER VATS FOR LUNG CANCER Table 4. Histologic Diagnosis Diagnosis No. Adenocarcinoma 211 Squamous cell carcinoma 91 Adenosquamous cell carcinoma 7 Large cell carcinoma 4 Small cell carcinoma 10 Carcinoid 1 Mucoepidermoid 1 Technical Aspects Under single-lung anesthesia, the patient was placed in the lateral decubitus position with an air-pillow beneath. A 10-mm, 30-degree thoracoscope was placed through the seventh intercostal space in the midaxillary line. A 2-cm incision was then made in the seventh intercostal space in the auscultatory triangle. We chose not to use a trocar so that an assistant could use two instruments through this port. An access thoracotomy was always located in the fourth intercostal space in the anterior axillary line (3 to 5 cm) for any type of pulmonary resection. Pulmonary vessels and bronchi were dissected in the same manner as for open thoracotomy. Branches of the pulmonary artery were ligated with 3-0 Vicryl (Ethicon, Somerville, NJ). An endoscopic linear stapler was used for pulmonary veins and bronchi. Plication of the fissure was also performed with a stapler. Resected specimens were placed in plastic specimen bags for retrieval to avoid implantation of tumor cells. In general, complete hilar and mediastinal lymph node dissection (ie, an en-bloc dissection of lymph nodes and the surrounding fat tissue) was performed, as in open thoracotomy. For patients with severe preoperative morbidity or for patients older than 80 years, only hilar dissection and mediastinal lymph node sampling were performed. Resection was considered complete when the resection margins were free of disease. Pathologic staging was performed according to the 6th International Staging System for Lung Cancer [11]. Patients were followed from the date of the operation until either death or March Operative mortality was defined as death within 30 days after the operation or as in-hospital death without having been discharged. Recurrence sites were recorded as either at the bronchial stump, within the ipsilateral thorax, mediastinal, or distant. The cause of death was recorded as cancer-related, second primary lung cancer, other cause, or unknown. To analyze the validity of intention-to-treat for VATS major pulmonary resection, cases converted to thoracotomy were also included in this analysis. Survival was calculated, and adverse events, including all causes of death, were evaluated. Data Analysis Survival rates were calculated by life-table analysis. Kaplan-Meier survival curves were compared using the log-rank test for univariate analysis. A probability value of 0.05 or less was considered significant. Results Indications for Video-Assisted Thoracic Surgery and Thoracotomy Table 1 shows procedure type in all patients operated on for primary lung cancer during the study period. During this period, although VATS major pulmonary resection was scheduled in 325 patients, thoracotomy was eventually performed in 152. Table 2 shows the distribution of cases by year. During the first 2 years, VATS was scheduled only for technically and oncologically favorable patients. After our initial learning curve, the indication for VATS was extended to almost all patients in whom VATS was considered technically possible. During the latter 2 years, more than 80% of all patients were operated on using the VATS approach. Details of indications for thoracotomy are shown in Table 3. During the first 2 years, in addition to technical reasons, several patients underwent thoracotomy for oncologic reasons. In the latter 2 years, most cases of thoracotomy were performed for bronchoplasty and chest-wall resection. Patient Characteristics Of the 325 VATS-scheduled patients, 197 were men and 128 were women; the mean age was 67 years (standard deviation, 9.6; range, 36 to 85 years). Fifteen patients received preoperative induction chemotherapy. Of the 325 scheduled VATS, 21 procedures were converted to open thoracotomies (6.4%). Of the 21 conversions, 9 were Table 5. Morbidity and Mortality Complications Morbidity (%) Mortality Bronchial complications Fistula empyema Stenosis Pulmonary complications Empyema without fistula Pneumonia Respiratory failure Interstitial pneumonia Prolonged air leak 7 days Atelectasis requiring bronchoscopy Cardiovascular complications Arrhythmia Pulmonary embolus Cerebral infarction Other complications Postoperative bleeding Chylothorax Horner s syndrome Ileus Other in-hospital death 1 Total

4 356 YAMAMOTO ET AL Ann Thorac Surg LONG-TERM SURVIVAL AFTER VATS FOR LUNG CANCER 2010;89:353 9 Fig 1. Overall (A) and disease-free (B) survival according to pathologic stage. Overall and disease-free 5-year survival rates were 85% and 83% for stage Ia (192 cases), 69% and 64% for stage Ib (50 cases), 48% and 37% for stage II (27 cases), and 29% and 19% for stage III (50 cases), respectively (p ). for bleeding from the pulmonary artery, 2 were for calcified hilar lymph node, 2 were for incomplete fissure, 2 were for complete obliteration of the pleural cavity, 1 was for bleeding from the pulmonary vein, 1 was for bleeding from the superior vena cava, 1 was for lack of working space owing to cardiomegaly, 1 was for misconception of the pulmonary vein and reanastomosis, 1 was for misconception of the pulmonary artery and reanastomosis, and 1 was for tumor invasion into the pulmonary artery. Histologic types are detailed in Table 4. Mediastinal lymph node dissections were performed for 274 patients, and hilar lymph node dissections with mediastinal lymph node sam-

5 Ann Thorac Surg YAMAMOTO ET AL 2010;89:353 9 LONG-TERM SURVIVAL AFTER VATS FOR LUNG CANCER Table 6. Overall and Disease-Free 5-Year Survival Stage No. Overall Survival (%) Disease-Free Survival (%) Ia Ib II III IV pling were performed for 51 patients. The average number of lymph nodes dissected was for mediastinal lymph node dissection and for hilar lymph node dissection and mediastinal lymph node sampling. Mortality and Morbidity Table 5 shows the mortality and morbidity results. One patient died in hospital (0.3%); this patient had exhibited the aftereffects of multiple cerebral infarctions before undergoing surgery, and the general preoperative condition was very poor (World Health Organization performance status, 2 to 3). The patient ultimately died of respiratory failure 3 months after the operation. A total of 101 complications occurred for 92 patients (28%). In this series, 55 patients experienced prolonged air leaks for more than 7 days, but only 2 required a rethoracotomy. The rates of other complications, such as pneumonia and arrhythmia, were as low as those reported in a previous study [5]. Survival Follow-ups were completed for 307 patients (94.4%). Patients were followed up until either death or for at least 5 years after the operation. The average follow-up period for censored cases was 66 months and was as long as 104 months. Overall and disease-free 5-year survival rates were 85% and 83% for stage Ia (192 cases), 69% and 64% for stage Ib (50 cases), 48% and 37% for stage II (27 cases), and 29% and 19% for stage III (50 cases), respectively (p ; Fig 1). All stages and survival rates for the 325 cases are detailed in Table 6. The number of cases performed using the VATS approach increased year by year, especially after 2002 when we expanded our criteria. Table 7 shows 5-year survival rates of each stage by year. Long-term survival rates were comparable throughout the study period, especially for patients treated in the early disease stages. Sites of Recurrence and Causes of Death Of the 104 patients who died, death was attributable to lung cancer recurrence in 65 patients (local, 24; mediastinal, 8; distant, 28; and unknown, 5) and to a second primary lung cancer in 1 patient. If the data are limited to 5 years follow-up to avoid bias owing to differences of follow-up periods, 90 patients died; death was attributable to lung cancer recurrence for 60 patients and second primary cancer for 1 patient. The first sites of recurrence for the entire group included the bronchial stump (n 4), ipsilateral thorax (n 26), mediastinum (n 9), and distant sites (n 42). There were no recurrences at the thoracotomy access sites or at the incisions through which the instruments or thoracoscopes were inserted. Comment Video-assisted thoracic surgery lobectomy for primary lung cancer was first reported in the early 1990s [1 3]. Since then, several authors have reported its advantages over conventional thoracotomy in terms of its feasibility and safety [4, 5]. In the present study, morbidity and mortality for VATS major pulmonary resection was also better than, or at least equivalent to, conventional thoracotomy. Despite these positive results, the use of VATS lobectomy for malignancies has spread slowly during the past decade. One reason for this slow expansion of VATS lobectomy for primary lung cancer is doubt regarding the oncologic validity of this procedure. Several authors have reported better, or at least equivalent, long-term survival rates for VATS lobectomy as compared with conventional thoracotomy [7 10]. However, most of these studies dealt with small numbers of cases with relatively short follow-up periods. In addition, these cases were highly selected for early stage lung cancer, such as stage I or Ia. With these selection biases, it is difficult to conclude whether VATS lobectomy is truly equivalent to conventional thoracotomy. To reduce these biases, only cases with a follow-up of longer than 5 years were analyzed in this study. However, this was a retrospective study in a single institution, Table 7. Overall and Disease-Free Survival by Year Year Stage No. Overall Survival (%) Disease-Free Survival (%) 2000 Ia Ib II III IV Ia Ib II III IV Ia Ib II III IV Ia Ib II III IV

6 358 YAMAMOTO ET AL Ann Thorac Surg LONG-TERM SURVIVAL AFTER VATS FOR LUNG CANCER 2010;89:353 9 and the indications for VATS approach were expanded year by year. Therefore, selection biases did exist, and a simple comparison between long-term survival rates of the VATS group and those of the thoracotomy group has little significance and may be somewhat confusing in the estimation of the oncologic validity of the VATS approach. Therefore, in addition to the comparison of long-term survival of VATS major pulmonary resection patients with results reported in several historic reports, we also analyzed the indications for open thoracotomy in an effort to characterize this group s patient populations and their changes by year. In our series, overall and disease-free 5-year survival rates, which are shown in Table 6, were comparable to results after conventional thoracotomy for primary lung cancer [11 13]. Our ratio of VATS cases to total cases increased from 50% to more than 80% during and after the initial learning-curve period. After the learning period, almost all operations except bronchoplasty and chest-wall resection were performed using the VATS approach, and long-term survival rates were equivalent during the entire study period, which in itself may suggest the oncologic validity of this procedure. In other words, if the inclusion criteria are strictly selected, it may be possible to maintain comparable quality to conventional thoracotomy, even during the learning-curve period. Another reason for the slow acceptance of this procedure is its technical aspect and the difficulty of introducing this technique into general thoracic services in which only open procedures are performed (ie, the learning curve). Furthermore, the definition of VATS lobectomy is itself unclear; this is because the technique may include visualization through the incision or only on a monitor, its performance is not limited to a specific length of incision, and the surgeon may or may not make use of a rib spreader. In our service, VATS routinely involves only visualization on a monitor and a 3- to 5-cm access thoracotomy without the use of a rib spreader or additional thoracic ports. By using a monitor, the surgeon and assistants can share the same visualization, which is very important not only for safe dissection of hilar structures but also for educating surgeons and residents who have little experience with VATS lobectomy. We have found that the use of a rib spreader or thoracic ports interferes with assistants ability to use two instruments for retraction of the lung and to aid with dissection of the hilar structures. Using this method, an experienced surgeon can operate with an inexperienced trainee who shares the same visualization. The assistant can actively participate in the operation under the supervision of the surgeon and can assist in this procedure step by step, guided closely by the experienced surgeon, with fewer difficulties during the learning curve and with the same quality surgical outcome as would be provided by the mentoring surgeon. Regarding the technical aspect, mediastinal lymph node dissection using the VATS approach is controversial, although several authors have documented its feasibility for experienced surgical centers [14 16]. With a thoracoscope, visualization is sometimes better than for conventional thoracotomy because the thoracoscope can enter a narrow space, such as a deep aortopulmonary window or the subcarinal area. Recent conventional thoracotomy uses a smaller incision than previous methods, and it is sometimes difficult to visualize a deep space through a small incision to dissect the lymph nodes of the left tracheobronchial angle or subcarina. Currently, we perform VATS major pulmonary resections in almost all patients for whom we consider the technique to be technically possible. Recent exclusion criteria at our service included central tumors that require bronchoplasty or angioplasty or patients with first- or second-rib tumor involvement. With these exclusions, long-term survival rates for each year of our experience were comparable for VATS and conventional thoracotomy. Although it is necessary to conduct further investigations, these results may suggest that VATS major pulmonary resection can become a standard approach for use at a highly experienced surgical center for primary lung cancer, especially in the early stages. For this purpose, development of a training program to introduce this technique is essential. Use of VATS major pulmonary resection for primary lung cancer is feasible, with long-term survival rates comparable to those for conventional thoracotomy. It is possible for this approach to become the standard approach, especially in the early stages of lung cancer, at experienced surgical centers. Further investigation at multiple centers is required. We would like to thank Thoru Sakuragi, MD, for his editorial assistance with this manuscript. References 1. Roviaro G, Rebuffat C, Varoli F, Vergani C, Mariani C, Maciocco M. Videoendoscopic pulmonary lobectomy for cancer. Surg Laparosc Endosc 1992;2: Kirby TJ, Mack MJ, Landreneau RJ, Rice TW. Initial experience with video-assisted thoracoscopic lobectomy. Ann Thorac Surg 1993;56: Walker WS, Carnochan FM, Pugh GC. Thoracoscopic pulmonary lobectomy. Early operative experience and preliminary clinical results. J Thorac Cardiovasc Surg 1993;106: Onaitis MW, Petersen RP, Balderson SS, et al. Thoracoscopic lobectomy is a safe and versatile procedure: experience with 500 consecutive patients. Ann Surg 2006;244: McKenna RJ Jr, Houck W, Fuller CB. Video-assisted thoracic surgery lobectomy: experience with 1,100 cases. Ann Thorac Surg 2006;81: Boffa DJ, Allen MS, Grab JD, et al. Data from The Society of Thoracic Surgeons General Thoracic Surgery database: the surgical management of primary lung tumors. J Thorac Cardiovascular Surg 2008;135: Walker WS, Codispoti M, Soon SY, Stamenkovic S, Carnochan F, Pugh G. Long-term outcomes following VATS

7 Ann Thorac Surg YAMAMOTO ET AL 2010;89:353 9 LONG-TERM SURVIVAL AFTER VATS FOR LUNG CANCER lobectomy for non-small cell bronchogenic carcinoma. Eur J Cardiothorac Surg 2003;23: Roviaro G, Varoli F, Vergani C, Nucca O, Maciocco M, Grignani F. Long-term survival after videothoracoscopic lobectomy for stage I lung cancer. Chest 2004;126: Sugi K, Kaneda Y, Esato K. Video-assisted thoracoscopic lobectomy achieves a satisfactory long-term prognosis in patients with clinical stage IA lung cancer. World J Surg 2000;24: Swanson SJ, Herndon JE 2nd, D Amico TA, et al. Videoassisted thoracic surgery lobectomy: report of CALGB a prospective, multi-institution feasibility study. J Clin Oncol 2007;25: Mountain CF. Revisions in the International System for Staging Lung Cancer. Chest 1997;111: Naruke T, Tsuchiya R, Kondo H, Asamura H. Prognosis and survival after resection for bronchogenic 359 carcinoma based on the 1997 TNM-staging classification: the Japanese experience. Ann Thorac Surg 2001;71: van Rens MT, de la Rivière AB, Elbers HR, van Den Bosch JM. Prognostic assessment of 2,361 patients who underwent pulmonary resection for non-small cell lung cancer stage I, II, and IIIA. Chest 2000;117: Watanabe A, Koyanagi T, Ohsawa H, et al. Systematic node dissection by VATS is not inferior to that through an open thoracotomy: a comparative clinicopathologic retrospective study. Surgery 2005;138: Watanabe A, Koyanagi T, Obama T, et al. Assessment of node dissection for clinical stage I primary lung cancer by VATS. Eur J Cardiothorac Surg 2005;27: Sagawa M, Sato M, Sakurada A, et al. A prospective trial of systematic nodal dissection for lung cancer by video-assisted thoracic surgery: can it be perfect? Ann Thorac Surg 2002;73: INVITED COMMENTARY Thoracoscopic lobectomy continues to slowly increase in popularity, although in recent years only 30% of the lobectomies entered in the Society of Thoracic Surgeons database were labeled as being performed using thoracoscopy. However, experienced thoracoscopic surgeons typically perform 80% or more of their lobectomies thoracoscopically, reserving thoracotomy for extremely large tumors or resections that demand bronchial or arterial reconstruction. The reasons for this disparity are multiple and likely include: (1) lack of training for practicing surgeons, (2) a relatively steep learning curve for thoracoscopic lobectomy, and (3) questions regarding long-term effectiveness. Hopefully the wealth of current literature addressing the safety profile of thoracoscopic lobectomy would lead surgeons to preferentially choose this approach. Data from large propensity-matched series, case-matched series, and a meta-analysis all document a reduction in morbidity from lobectomy when a thoracoscopic approach is adopted, with no difference in 30-day mortality rates. Long-term effectiveness of thoracoscopic lobectomy in comparison with lobectomy by thoracotomy remains incompletely defined at this time. Because it is unlikely that a large multicenter, randomized clinical trial will ever be undertaken, studies such as this one by Kazumichi and colleagues are important additions to the literature [1]. Kazumichi and colleagues have presented a relatively large series of thoracoscopic major pulmonary resections (87% lobectomies) that have all been followed-up for at least 5 years. These authors report data that are most robust for stage I patients, as the number of higher stage patients is small [1]. They report overall and disease-free survival, and their stage-specific overall survival is as good or better than those in the 7th Edition of the American Joint Committee on Cancer (AJCC) Tumor, Node, and Metastasis (TNM) classification [1]. Kazumichi and colleagues have documented survival rates that were equivalent, both during the early years of the study (highly selected patients) as well as the latter years (relatively unselected patients). These survival results are remarkably similar to other large, single institution series, such as those from Cedars Sinai and Duke. When performed, according to accepted standards (including individual hilar vessel and bronchial ligation, complete hilar nodal dissection, appropriate management of mediastinal lymph nodes, and extraction of the specimen in a protective bag) thoracoscopic lobectomy is oncologically the same as open lobectomy, but just using smaller incisions and no rib spreading. In addition, patients who undergo thoracoscopic lobectomy are more likely to tolerate adjuvant chemotherapy. It is quite possible that long-term survival is improved by a thoracoscopic approach. Therefore, the answer to Kazumichi and colleagues [1] question: Can [video-assisted thoracoscopic surgery] VATS become a standard approach, is an emphatic yes. Not only can it become a standard approach, but it should be the standard approach to the resection of early stage lung cancer. William Burfeind, Jr, MD Thoracic Surgery St. Luke s Health Network 701 Ostrum St, Ste 201 Bethlehem, PA burfeiw@slhn.org Reference 1. Yamamoto K, Ohsumi A, Kojima F, et al. Long-term survival after video-assisted thoracic surgery lobectomy for primary lung cancer. Ann Thorac Surg 2010;89: by The Society of Thoracic Surgeons /10/$36.00 Published by Elsevier Inc doi: /j.athoracsur