Introduction

Lung cancer is the leading cause of cancer death worldwide [1]. Surgical resection remains the gold standard for curative treatment of early-stage lung cancer. Although patients are often diagnosed with advanced disease at presentation, surgical management is employed in cases of selected locally advanced T3 and T4 disease. According to a report of a nationwide registry study of surgical lung cancer cases during 2004, which was conducted by the Japanese Joint Committee of Lung Cancer Registry, 8.7 % of patients underwent combined resection of involved neighboring structures [2].

T3 lesions with limited, circumscribed extrapulmonary extension are thought to be potentially surgically resectable, whereas T4 tumors with extensive extrapulmonary extension are considered unresectable. However, the Union for International Cancer Control revised the TNM staging in the seventh edition published in 2009; that is, T4N0–1M0 lesions, which were classified as stage IIIB disease in the sixth edition, are now categorized as stage IIIA disease [3]. This modification indicates that T4 tumors without mediastinal nodal metastasis are potentially curable if complete resection is possible. Although carcinomatous pleuritis is now classified as M1a and stage IV disease, this condition was categorized as T4 disease in the previous TNM classification and several results of the surgical treatment have been reported to date.

Therefore, we herein review the modern surgical management of locally advanced non-small cell lung cancer including carcinomatous pleuritis, with reference to the involved organs, and discuss the role of such treatment.

Chest wall

In 1947, Coleman first reported the curative treatment with pneumonectomy and simultaneous block resection of the chest wall for primary carcinoma of the lung with invasion of the ribs [4]. Since then, surgical treatment for lung cancer with chest wall invasion has been reported with acceptable morbidity and mortality rates.

Table 1 shows the recently reported outcomes of patients treated with surgical resection for lung cancer with chest wall invasion [58]. Complete resection and lymph node metastasis have been reported to be implicit prognostic factors in patients with such locally advanced lung cancer, whereas the depth of invasion and extent of combined resection remain controversial. A few investigators have emphasized the routine application of en bloc resection of the lung and ribs, regardless of the depth of chest wall invasion, from the viewpoint of obtaining a safe margin [9, 10], while others have recommended the use of extrapleural resection for lung cancer with invasion limited to the parietal pleura due to the lower morbidity and mortality rates [5, 6, 11]. Extrapleural resection is generally selected in cases of lung cancer with shallow invasion limited to the parietal pleura, and the high rate of complete resection demonstrates that experienced surgeons are able to make a correct judgment regarding the extent of combined resection during surgery in such cases. Consequently, patients with N0–1 disease are considered to be good candidates for surgical treatment, which is required to achieve complete resection with a negative surgical margin. Furthermore, combined resection of the chest wall has been shown to be a very high-risk procedure in elderly patients [6].

Table 1 Surgical outcomes of patients with lung cancer involving the chest wall

The surgical methods used for chest wall resection are common and non-specific. In general, detachment from the chest wall is first performed in order to avoid congestion of the lung to be excised. It is essential to maintain an adequate margin from the tumor when cutting the ribs. The indications of and methods for chest wall reconstruction vary among institutions. Generally, the indication for reconstruction is as follows: a large defect of caudal chest wall, which area is not covered with scapula, including resection of more than three ribs or measuring at least 4.0 × 4.0 cm in area. Weyant et al. [12] emphasized that the incidence of respiratory failure in their series was lower than that previously reported, which may be related to their routine use of a rigid prosthesis for reconstruction of large, anteriorly or laterally located defects causing a flail chest.

Concerning perioperative therapy, lung cancer with chest wall invasion is mostly staged as IIB or IIIA disease; therefore, the administration of adjuvant chemotherapy after surgical resection is recommended in many modern guidelines. On the other hand, a few reports have been published regarding the efficacy of induction therapy for lung cancer with chest wall invasion, whereas preoperative chemoradiotherapy has become a standard strategy for treating superior sulcus tumors (SSTs). In patients with chest wall invasion, we have conducted a phase II study, the Central Japan Lung Study Group Trial 0801, under the hypothesis that induction chemoradiotherapy followed by surgery can improve the prognosis such as in patients with SST [13].

Superior sulcus

SSTs or apical chest tumors, sometimes referred to as Pancoast tumors, were first described by a radiologist, Pancoast [14]. These tumors are located in the apex of the thoracic cavity and often detected at an advanced stage. Due to their anatomical location, involvement of the surrounding structures, such as the brachial plexus, subclavian vessels and/or spine, is usually observed in association with involvement of the first rib. Therefore, this disease was considered a contraindication for surgery until Chardack and Maccallum [15] reported the case of a long-term survivor treated with en bloc resection of the right upper lobe, chest wall and nerve roots followed by adjuvant radiotherapy. Subsequently, the strategy of applying induction radiation at a dose of 30–35 Gy followed by surgery with curative intent was introduced by Shaw et al. [16]. The standard treatment strategy for SST remained unchanged for approximately 30 years until trimodality therapy consisting of induction chemoradiation followed by surgical resection was developed.

Based on the findings of recent reports, as shown in Table 2, concurrent chemoradiotherapy prior to resection has become the standard treatment for resectable SST [1720]. The Southwest Oncology Group and Japan Clinical Oncology Group both conducted prospective phase II studies of induction chemoradiation followed by surgery in SST patients and reported significantly superior results with respect to the rates of complete resection and survival compared to that observed in the previous literature, despite the use of a multi-institutional setting [18, 19]. Candidates for the trimodality therapy are thought to include patients with N0–1 or ipsilateral N3 (supraclavicular) disease and/or T3–4 tumors, such as those with tumor invasion to the subclavian vessels, Th1 and C8 nerve roots or spine, when potentially resectable.

Table 2 Surgical outcomes of patients with superior sulcus tumor

The surgical approach is the most interesting aspect with respect to the treatment of SST due to anatomical difficulties. The standard approach of creating a higher posterolateral incision for SST invading the middle or posterior compartments of the thoracic inlet was first reported by Shaw et al. [16]. Dartevelle et al. [21] later reported the use of the anterior approach to treat subclavian vessels exhibiting tumor involvement, and the evolution of surgical treatment, particularly that employing the anterior approach, was ignited. Other surgical approaches for SST have been reported by a number of thoracic surgeons [2225], and the appropriate approach should be selected according to the locoregional extension of the tumor [26].

Pericardium

A few studies have assessed tumors invading the pericardium, and patients with such tumors have been reported to generally have a worse prognosis (Table 3) [8, 27, 28]. However, due to the small number of patients, the current results remain equivocal. Because prognostic factors have not yet been determined, the optimal operative indications for patients with tumor invading the pericardium remain an open question.

Table 3 Surgical outcomes of patients with lung cancer involving the pericardium

En bloc resection of the pericardium along with the tumor is usually possible. At the time of pericardial resection, it is necessary to obtain a sample of the pericardial effusion for a cytological examination. If malignant findings are observed, resection must be abandoned. Following resection of the pericardium, reconstruction may be performed using non-absorbable material to prevent cardiac herniation, if necessary.

Diaphragm

Because lung cancer involving the diaphragm is also rare, only a few reports with a relatively small number of cases have been published concerning the surgical treatment of patients with these tumors (Table 4) [8, 27, 29, 30]. The frequency of diaphragmatic invasion of lung cancer is extremely low, at 0.3–0.4 % [8, 29, 30].

Table 4 Surgical outcomes of patients with lung cancer involving the diaphragm

Patients with N0 disease are considered to be good surgical candidates. Because the number of patients with N1 disease totaled less than 20 in all previous reports, it remains controversial whether to recommend surgery in such cases. Incomplete resection of lung cancer with diaphragmatic involvement offers no curative benefits. In patients with complete resection, combined resection of other organs has been reported to have an adverse effect on survival [30].

En bloc resection of the diaphragm along with the tumor should be attempted whenever possible. Generally, more than 2 cm of the macroscopically uninvolved diaphragm is excised from all tumor borders. If the defect area in the diaphragmatic muscle is smaller than the size of a fist, it is possible to perform direct suturing with non-absorbable bladed sutures. In cases of large defects, diaphragmatic reconstruction using non-absorbable material may be necessary to prevent herniation of the abdominal organs.

Trachea, carina and main bronchus

Lung cancer sometimes lies in the main bronchus within 2 cm of the carina (T3 lesions) and/or involves the trachea or carina (T4 lesions). Surgical intervention for these lesions requires challenging techniques for thoracic surgeons.

Main bronchus within 2 cm of the carina

Pneumonectomy and sleeve lobectomy are conducted for the surgical treatment of tumors located in the main bronchus within 2 cm of the carina [31]. In order to avoid pneumonectomy, which results in a substantial loss of the lung function and quality of life, bronchoplastic techniques combined with various surgical methods, such as pulmonary artery reconstruction, have been performed [32]. The operative mortality for sleeve lobectomy is approximately 2 % [33]. The modern surgical outcomes for T3 tumors invading the central main bronchus are shown in Table 5 and appear to be superior to those of other T3 tumors [8, 27, 34].

Table 5 Surgical outcomes of patients with lung cancer involving the main bronchus within 2 cm of the carina

Trachea and carina

Surgical treatment for tumors with tracheal and/or carinal invasion has been performed using sleeve pneumonectomy and tracheocarinal resection. Encouraging results have been reported in recent series, in particular an excellent survival rate in pN0 patients (Table 6) [3539]. Patients with N2 involvement exhibit a poor prognosis, even when treated with aggressive surgical resection. The long-term survival has been reported to be influenced by the pathologic nodal status and completeness of resection, not age, sex or pre- or postsurgical oncologic treatment [39]. The operative mortality has recently been reported to be 3–8 % [36, 38, 39], which is similar to that noted for conventional pneumonectomy, ranging from 5 to 15 %.

Table 6 Surgical outcomes of patients with lung cancer involving the trachea and carina

Right sleeve pneumonectomy is the most common procedure for treating these tumors, and the safe limit of resection is approximately 4 cm between the lower trachea and left main bronchus [40]. A variety of carinal resection and reconstruction procedures have been performed according to the tumor characteristics in practice, and the use of careful patient selection and anesthetic and surgical techniques is advocated in order to minimalize morbidity and mortality [41].

Left atrium

The optimal management of patients with lung cancer invading the left atrium remains controversial. Nevertheless, some tumors have occasionally been removed, with reported 5-year survival and operative mortality rates of 14–30 and 0–10 %, respectively (Table 7) [4246]. The survival rates are less favorable than those associated with resection of other T4 structures. The nodal status, type of operation and completeness of resection have been found to have a significant impact on survival [45, 46]. Therefore, in carefully selected NSCLC patients with left atrium invasion, candidates for surgical resection are only those with N0–1 disease.

Table 7 Surgical outcomes of patients with lung cancer involving the left atrium

Although combined resection of the lung and left atrium is performed using vascular clamps, cardiopulmonary bypass (CPB) is required in cases of intraluminal polypoid tumor growth. However, as reported in the literature, the application of CPB has only rarely been used [45] and is frequently avoided [4244]. In patients with right tumors, the Sondergaard technique is useful for lengthening the left atrial cuff [44].

Superior vena cava

Lung cancer with invasion of the superior vena cava (SVC) has been considered to be a contraindication for surgery [47]. However, over the last 20 years, several reports regarding the surgical resection in selected patients have shown improved results, with acceptable perioperative morbidity, mortality and 5-year survival rates (Table 8) [38, 4850].

Table 8 Surgical outcomes of patients with lung cancer involving the superior vena cava

Which type of SVC resection and reconstruction is performed depends on the degree of venous involvement [50]. Following partial SVC resection, the pattern of reconstruction includes the use of simple running sutures, vascular staplers or patch replacement. In cases of SVC infiltration of more than 50 % of the circumference of the vessel, total prosthetic replacement of the SVC is required using an extraluminal shunt placed between the left brachiocephalic vein and the right atrium and the cross-clamping technique.

Suzuki et al. [49] identified SVC invasion by metastatic lymph nodes to be a significant poor prognostic factor. On the other hand, several studies have reported that the lymph node status and completeness of resection do not significantly affect survival [38, 48]. Clinically, among carefully selected NSCLC patients with SVC invasion, candidates for surgical resection are considered to include those with N0–1 disease and the potential for complete resection [51].

Aorta

Aortic involvement by lung cancer has long been considered to be a relative contraindication for surgical resection. However, in recent years, the publication of several reports regarding aortic resection and replacement has increased interest in the application of extended procedures. Among studies focusing specifically on aortic resection, the overall 5-year survival rate has been reported to be 17–48 %, with an operative mortality of 0–13 % (Table 9) [5255]. The encouraging long-term survival rates obtained in patients with N0 disease and complete resection are essential in selected patients with aortic involvement.

Table 9 Surgical outcomes of patients with lung cancer involving the aorta

The type of aortic resection depends on the degree of tumor involvement and consists of subadventitial dissection and aorta en bloc resection and reconstruction. In cases in which segmental resection of the descending aorta is necessary, partial cardiopulmonary bypass between the femoral vein and artery or temporary bypass grafting from the ascending to the descending aorta is used. Recently, some reports have shown that pulmonary resection with combined resection of the aortic wall can be successfully accomplished after thoracic aorta endovascular stent graft placement without the use of cardiopulmonary bypass support [56, 57]. The placement of an endovascular stent is an alternative in selected patients with aortic invasion.

Spine

Lung cancer that invades to the spine is classified as T4 disease, which has long been considered to be unresectable. However, due to the development of innovative approaches for performing vertebral resection and spinal reconstruction and the combined use of multimodality therapy since the late of 1980s, low mortality with encouraging 5-year survival rates of 31–61 % has been reported in several series (Table 10) [5861].

Table 10 Surgical outcomes of patients with lung cancer involving the spine

Surgery alone is almost never an adequate treatment for this disease and must be combined with other modalities. Recently, the introduction of concurrent chemoradiation prior to surgery for SST, which often exhibits upper spinal involvement, has been reported to yield relatively favorable rates of complete resection and overall survival [18, 62].

There are several thoughts as to the resection technique for performing vertebrectomy. The technique introduced by Grunenwald et al. [63] involves en bloc total vertebrectomy, in which the transmanubrial approach [24] is used, followed by the creation of a posterior midline incision. After performing laminectomy one level above and below the tumor, the vertebral body is rotated into the chest toward the tumor and subsequently removed en bloc along with the lung and chest wall. Anraku et al. [64] introduced their ‘staged surgery’ for multiple-level total vertebrectomy based on the principle of en bloc resection. Recently, long-term favorable outcomes of this procedure were reported, with a 5-year survival rate of 61 % in 48 patients [61]. The authors also reported that the response to induction therapy was found to be an independent prognostic factor in a multivariate analysis.

Carcinomatous pleuritis

Carcinomatous pleuritis in patients with lung cancer is usually found to accompany frank malignant pleural effusion and is associated with a short-term survival [65]. The present TNM classification categorizes this condition as M1a and stage IV disease and suggests that patients with carcinomatous pleuritis are candidates for non-surgical treatment. However, this disorder is sometimes discovered with or without a small amount of pleural effusion during thoracotomy in patients with resectable lung cancer, with a reported incidence of 1.5–4.5 % [6668]. Surgical treatment has been applied in affected patients at some institutions, achieving long-term survival in selected cases [6670]. On the other hand, the outcome of chemotherapy for patients with pleural dissemination detected during surgery was recently reported, and the result was more favorable than that of patients with preoperatively diagnosed stage IV disease [71]. Therefore, a part of carcinomatous pleuritis could be considered as a locally advanced disease.

The surgical procedures employed are diverse, including limited resection, lobectomy, pneumonectomy and extrapleural pneumonectomy. The median postoperative survival time and 5-year survival rate have been reported to be 17–30 months and 13–24 %, respectively (Table 11) [6668, 70]. We performed extrapleural pneumonectomy in 23 patients between 1988 and 2012, with a median survival time and 5-year survival rate of 34 months and 34 %, respectively [69, 70]. Among 12 patients with pathologic N0–1 disease, six remain alive without disease at four to 288 months after surgery, for a median survival time and 5-year survival rate of 126 months and 61 %, respectively. These results indicate that carefully selected patients with carcinomatous pleuritis may be candidates for surgical treatment including extrapleural pneumonectomy.

Table 11 Surgical outcomes of patients with lung cancer and carcinomatous pleuritis

Nevertheless, at present, with the progression of chemotherapy and molecular targeted therapy, a few reports of the outcomes of patients with carcinomatous pleuritis detected during surgery are available [71]. Therefore, the appropriate treatment strategy for patients with minimal pleural carcinomatosis should be investigated.

Conclusion

Locally advanced lung cancer with involvement of the neighboring structures is usually treated with chemotherapy and radiotherapy, with the exception of T3N0–1M0 tumors. However, promising outcomes of surgical treatment have been reported in selected patients with more advanced T4 tumors, and the TNM classification has been revised according to these results. Furthermore, due to improvements in surgical techniques and perioperative management as well as progress in the development of combined treatment modalities, such as radiotherapy and chemotherapy including molecular targeted therapy, it is now possible to administer more aggressive multidisciplinary treatment. Therefore, the criteria for selecting candidates for surgical treatment of lung cancer involving the neighboring structures should be reevaluated.