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Ann Thorac Surg 2004;78:1200-1205
© 2004 The Society of Thoracic Surgeons
a Division of Cardiothoracic Surgery, Columbia University Medical Center, New York Presbyterian Hospital, New York, New York, USA
b The Thoracic Oncology Program, Greenebaum Cancer Center, University of Maryland, School of Medicine, Baltimore, Maryland, USA
Accepted for publication April 20, 2004.
* Address reprint requests to Dr Sonett, Division of Cardiothoracic Surgery, Columbia Presbyterian Medical Center, 622 W 168th St, PH 14, New York, NY 10032, USA
js2106{at}columbia.edu
Presented at the Thirty-Seventh Annual Meeting of The Society of Thoracic Surgeons, New Orleans, LA, Jan 2931, 2001.
| Abstract |
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METHODS: Data were reviewed from 40 consecutive patients who underwent lung resection after receiving high-dose radiotherapy and concurrent platinum-based chemotherapy between January 1994 and May 2000. The follow-up closing interval for this study was until August 2003 or time of death.
RESULTS: Preoperative stage was IIb (7 patients), IIIA (21 patients), IIIB (10 patients), and IV (2 patients with isolated brain metastasis). Thirteen patients exhibited Pancoast tumors. Median time from completion of induction therapy to surgery was 53 days. Twenty-nine lobectomies and 11 pneumonectomies (7 right, 4 left) were performed. There were no postoperative deaths. Intercostal muscle flaps were used prophylactically in all but one pneumonectomy patient. Seven patients required perioperative transfusions. Median intensive care unit (ICU) time averaged 2 days and the total length of stay was 6 days. One patient exhibited postpneumonectomy pulmonary edema and a bronchopleural fistula developed in another patient (not receiving an intercostal muscle flap). Thirty-four of 40 patients (85%; 95% CI: 70%94%) were downstaged pathologically, 33 out of 40 patients (82.5%, 95% confidence interval [CI]: 67%93%) indicated no residual lymphadenopathy, and 18 out of 40 patients (45%, 95% CI: 29%61%) exhibited a complete pathologic response. Median follow-up was 2.8 years. The 1-, 2-, and 5-year overall survival rates were 92.4%, 66.7%, and 46.2%, respectively. Disease-free 1-, 2-, and 5-year survival rates were 73.0%, 67.2%, and 56.4%, respectively. Median disease-free survival has not been reached.
CONCLUSIONS: Pulmonary resection may be performed safely after curative intent concurrent chemotherapy and radiotherapy to greater than 59 Gy. High pathologic complete response rates and sterilization of mediastinal lymph nodes were observed accompanied by highly favorable survival rates. This experience, though promising, will require confirmation in a prospective multiinstitutional clinical trial.
| Introduction |
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Recent large prospective studies have validated the use of concurrent chemotherapy and radiotherapy in nonsmall-cell lung cancer, which yields a superior long-term survival advantage as compared with sequential approaches [10, 11]. Radiotherapy delivered for curative intent in nonsurgical studies has generally been delivered in doses greater than 59 Gy (in contrast doses of 3045 Gy are generally employed in neoadjuvant approaches). The rationale toward more conservative radiotherapy in this setting has been based on previous reports that revealed unacceptable rates of postoperative complications when higher radiotherapy doses were administered [12]. Our group has previously reported the ability to safely perform pulmonary resection in a limited group of patients who received greater than 59 Gy of radiation [13, 14]. We update and supplement these reports with extended follow-up data in a series of 40 consecutive patients who underwent lobectomy or pneumonectomy after receiving concurrent platinum-based chemotherapy and radiotherapy greater than 59 Gy.
| Material and Methods |
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Inclusion of patients in this aggressive regimen was highly selective. Patients were considered only if they achieved an outstanding performance status and a predicted postoperative forced expiratory volume in 1 second (FEV1) as well as a diffusing capacity for carbon monoxide (DLCO) of greater than 40%. A thoracic surgeon, medical oncologist, and radiation oncologist evaluated each patient before the onset of therapy. This was not a prospective clinical trial thus only patients identified as having surgical resection after high-dose radiotherapy and concurrent chemotherapy were analyzed (however data was collected prospectively as part of a thoracic surgery database used to monitor the outcome of all patients). All patients provided informed consent for chemotherapy, radiotherapy, surgery, and the collection of data. The patients evaluated include each patient who met the abovementioned criteria.
Chemotherapy was administered at several institutions and was not standardized. Radiation treatment planning was based on pretherapy computed tomography (CT) scans for all patients. Three-dimensional (3D) conformal radiotherapy was delivered starting in 1996. A shrinking-field technique was commonly employed with parallel opposed anteroposteriorposteroanterior (APPA) large fields designed to encompass the primary tumor plus a 2-cm margin, the ipsilateral hilar and supraclavicular regions, and bilateral upper and mid-mediastinal nodal chains. Off-cord boost fields were designed to include the primary tumor plus a 1.5-cm margin. The cumulative spinal cord dose from both fields was limited to 50 Gy. Dose analysis was performed throughout the entire treatment volume and lung inhomogeneity correction factors were used for dose computations. A total dose of 4550.4 Gy was prescribed to the primary tumor, ipsilateral hilum, and mediastinum. In addition a small field boost of 14.421.6 Gy was given to the primary tumor alone and involved nodal fields. The final boost dose was, in part, based on the dose limitations of the spinal cord. The total dose delivered to the primary disease ranged between 59.6 and 66.6 Gy.
Data were entered on an Excel spreadsheet (Microsoft, Redmond, WA) and calculations were performed using GraphPad Prism software (GraphPad, San Diego, CA). Statistical analysis was performed using SPSS (version 10.0 for Windows; SPSS, Inc., Chicago, IL). Rates are reported with exact 95% confidence intervals (CI) (where appropriate) and survival rates were calculated using the KaplanMeier method [15]. The follow-up closing interval for this study was until August 2003 or time of death.
| Results |
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Chemotherapy
All patients received platinum-based chemotherapy using several regimens including carboplatin (AUC 6) and paclitaxel (4550 mg/m2) in 30 out of 40 patients (75%), cisplatin/etoposide (100 mg/m2) in 5 out of 40 patients (12.5%), cisplatin/navelbine (100/2530 mg/m2) in 4 out of 40 patients (10%), and 1 patient received carboplatin (AUC 6) alone on a weekly basis.
Surgery
All patients were restaged using a computed axial tomography (CAT) scan of the chest 4 weeks after therapy and 14 patients underwent mediastinoscopy after concurrent chemoradiotherapy. Median time to surgical resection after cessation of chemoradiotherapy was 52.5 days (range 20258 days).
All patients underwent anatomic lobectomy or pnuemonectomy with mediastinal lymph-node dissection. Intraoperative fluid administration was carefully limited and barotrauma during single lung ventilation to the contralateral lung was minimized as much as possible by limiting peak pressure and limiting volume of ventilation. After the first broncho-pleural fistula developed in a pneumonectomy patient, all pneumonectomy stumps were covered with an intercostal muscle flap as described previously by our group [13].
Surgical resection procedures included 29 lobectomies (72.5%) and 11 pneumonectomies (27.5%). Seven right pneumonectomies and four left pneumonectomies performed. Thirteen patients diagnosed with Pancoast tumors underwent en-bloc chest wall resection as part of their procedure. There was no operative or postoperative mortality. Seven patients required perioperative blood transfusions. Median intensive care unit (ICU) stay was 2 days (range 013 days) and the median length of total hospital stay was 6 days (range 325 days).
Considerable complications were seen in 7 patients. Postpneumonectomy pulmonary edema developed in 1 patient who received a substantial fluid load (2 U blood, 8 L crystalloid) intraoperatively after a right pneumonectomy and en-bloc resection of her first through fifth ribs. She recovered and is now free of disease 3 years after resection. A broncho-pleural fistula complicated the first pneumonectomy in the series. The bronchial stump was not covered with a muscle bundle, although the patient was ultimately managed with an Eloesser flap. A subarachnoid-pleural fistula developed in 1 patient undergoing a Pancoast resection. Two patients exhibited prolonged atelectasis and postoperative pneumonias developed in 3 patients. One patient has remained on supplemental oxygen as an outpatient.
Response to Therapy
Pathologic samples were reviewed on all patients. Thirty-four out of 40 patients (85%) were pathologically downstaged (Fig 1). Figure 1 depicts the overall downstaging effect of the induction therapy; Table 2 matches and tracks each patient's tumor response. No patient experienced progression of disease during induction therapy, however 6 patients remained in the same stage. Eighteen out of 40 patients (45%) exhibited a complete pathologic response with no evidence of viable tumor at resection. Thirty-three out of 40 patients (82.5%) exhibited no pathologic N1 or N2 adenopathy at the time of resection. Preoperatively 26 out of 40 patients (65%) exhibited clinical N2 disease, of which 16 were pathologically proven by mediastinoscopy before surgical resection. Postoperatively 22 out of 26 of these patients (84.6%) exhibited pathologically confirmed sterilization of their mediastinal nodes, 3 patients exhibited persistent N2 disease, and 1 patient exhibited residual N1 disease. Of those 16 patients with path-proven N2 disease, 14 patients (87.5%) were sterilized by the induction protocol.
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| Comment |
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Limited published series have reported pulmonary resection after higher dose radiotherapy (> 59 Gy) and concurrent chemotherapy [1214, 19]. In 1993 Fowler and associates reported an excessively high morbidity and mortality rate after pneumonectomy but not lobectomy in a phase II trial using 5 fluorouracil (5-FU), cisplatin, etoposide, and concurrent thoracic radiation to 60 Gy [12]. Six patients underwent lobectomy with no perioperative mortality, whereas 3 out of 7 (42%) pneumonectomy patients died from postoperative complications. Deutch and associates reported a similar series in 16 patients undergoing resection after radiation to 60 Gy and concurrent chemotherapy with carboplatin and etoposide. Of the patients undergoing lobectomy there were no postoperative deaths, whereas 2 out of 6 pneumonectomy patients died [19]. This current series corroborates the feasibility of lobectomy in patients who have received higher doses of radiation preoperatively (> 59 Gy) with no mortality or extended ventilation required in 29 patients undergoing lobectomy. Additionally we were able to safely perform pneumonectomy (including 7 right pneumonectomies) with no operative deaths in 11 patients.
The ability to safely perform lobectomy and pneumonectomy after higher doses of radiotherapy in this series may be attributed to several factors. First the development of sophisticated 3D-radiation treatment planning systems over the last decade has provided us with the opportunity to maximize radiation doses to the intended targets minimizing exposure to surrounding normal tissue [14]. Second the institution of routine coverage of all bronchial stumps with a vascularized muscle flap (primarily an intercostal muscle) seems to have eliminated the risk of bronchopleural fistula. Finally the low rate of postoperative acute respiratory distress syndrome may, in part, be attributed to both surgical management and improved radiotherapy techniques. We attempted to deliver no greater than 1 L of fluid during the operative procedure, to avoid high oxygen concentration levels, and to minimize barotrauma. Postoperatively fluid administration is severely limited using neosynepherine for postoperative hypotension (rather than fluid administration) and we commenced aggressive diuretic therapy shortly after surgery to maintain a considerable negative fluid balance (> l L) daily for at least 3 days.
The rationale for optimizing induction therapy is to offer patients the most beneficial medical therapy possible in an attempt to downstage and sterilize their mediastinal nodes before surgery. Multiple large studies have now documented that the sterilization of mediastinal nodes is the single most important prognostic sign with regard to long-term survival. The downstaging of the nodes as a maker of improved survival has been documented for both chemotherapy protocols and combined induction protocols of chemotherapy and radiotherapy. In the SWOG 8805 trial (induction chemotherapy and radiotherapy to 45 Gy) the strongest predictor of long-term survival after resection was the absence of tumors in mediastinal nodes (3-year survival rates are 44% for lymph-node negative patients [LN] vs 18% for lymph-node positive patients [LN+], p < 0.005). This study reported a 53% rate of sterilization of the mediastinal nodes [16]. In a recent analysis of prognostic factors in 103 patients reported by Bueno and associates, the downstaging of nodal disease was again determined to be the best predictor of long-term survival after induction therapy [20]. Patients in whom all nodal disease was eradicated indicated a 5-year survival rate of 35.8% versus patients with persistent N1 or N2 disease who indicated a 5-year survival rate of only 9% (p < 0.023). In that analysis 74 out of 103 patients (72%) received induction chemotherapy alone and 27 out of 103 patients (26%) received induction chemotherapy and radiotherapy. The rate of nodal sterilization was 26% (18 out of 67 patients). A similar rate was seen in the Cancer and Leukemia Group B (CALGB) prospective study of chemotherapy induction in stage IIIa disease (study 8935) in which the proven downstaging of N2 disease was 22% (10 out of 46 patients) [6]. The prognostic consideration of sterilization of mediastinal nodes was again confirmed in the large induction chemotherapy and radiation therapy (45 Gy) Intergroup trial 0139 in which superior results were seen in surgical patients who underwent complete mediastinal sterilization [9]. Two European trials, one by Betticher and associates and one by Voltolini and associates, indicate strikingly similar results of superior survival for patients in whom induction therapy sterilized mediastinal nodes as well [7, 8]. In this current study complete nodal sterilization was seen in 14 out of 16 patients (87.5%) with pathologically proven mediastinal adenopathy preoperatively. An encouraging overall survival rate of 46% at 5 years was observed. This improvement in nodal response may be, in part, attributed to the use of higher dose radiotherapy with concurrent chemoradiotherapy.
In designing an optimal induction protocol the addition of concurrent radiotherapy to systemic therapy has been indicated to improve survival versus both chemotherapy alone or sequentially delivered chemoradiotherapy [10, 11]. In a recent large nonoperative phase III study the West Japan Lung Cancer Group reported on patients with stage III nonsmall-cell carcinoma who were randomized to concurrent versus sequential chemoradiotherapy treatment. In the 323 patients that were studied the response rate (84% vs 66%, p = 0.0002) and the median survival rate (16.5 months vs 13.3 months, p = 0.039) were both improved with the delivery of concurrent versus sequential therapy. Of interest 35% (42 out of 117 patients) of the patients who failed in the sequential arm of the study recurred with local disease only, the highest single site of recurrence, an indication of the possible role of surgical resection after even optimal medical therapy [10]. Confirmation of improved survival rates using concurrent versus sequential chemoradiotherapy was recently reported in a large prospectively randomized Radiation Therapy Oncology Group (RTOG) trial [11]. In RTOG 9410 the median and 4-year survival rates were superior in patients receiving concurrent daily radiation to 60 Gy versus those receiving sequential therapy to 60 Gy (17 months versus 14.6 months median survival and 21% versus 12% 4-year survival).
There are notable limitations with regard to this study that warrant cautious interpretation and extrapolation of the results. This was a single institution retrospective analysis of a carefully selected cohort of patients with locally advanced nonsmall-cell lung cancer. This was not a prospective trial thus overall nodal sterilization, overall survival, and the ability to routinely deliver this therapy were not determined in an intent-to-treat manner. However the ability to safely bring this cohort of patients to surgical resection may allow future trials and treatment protocols to optimize the most advantageous medical therapy possible for patients with locally advanced disease and then also potentially randomize those patients toward either surgery or continued medical therapy without compromising the initial treatment.
Pulmonary resection, including lobectomy or pneumonectomy, after concurrent induction therapy with chemotherapy and radiation doses greater than 59 Gy may be performed with minimal morbidity or mortality. Advances in the delivery of radiation treatment fields, limited fluid administration, and vascularized bronchial stump coverage may all help to limit morbidity and mortality. The safety and effectiveness of neoadjuvant therapy with full-dose radiotherapy in the treatment of locally advanced nonsmall-cell lung cancer requires validation in prospective multiinstitutional clinical trails. Such a trial is currently planned by the Radiation Therapy Oncology Group.
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