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Ann Thorac Surg 2001;71:1105-1112
© 2001 The Society of Thoracic Surgeons
a Department of Thoracic and Cardiovascular Surgery, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
b Department of Thoracic Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA
Address reprint requests to Dr Putnam, Department of Thoracic and Cardiovascular Surgery, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd, Box 109, Houston, TX 77030
e-mail: putnam{at}mdanderson.org
Presented at the Thirty-sixth Annual Meeting of The Society of Thoracic Surgeons, Fort Lauderdale, FL, Jan 31Feb 2, 2000.
| Abstract |
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Methods. Three hundred eighty consecutive patients underwent lobectomy or greater resection for NSCLC between August 1, 1996, and April 30, 1999: 335 patients (259 S; 76 C+S) were analyzed; 45 additional patients were excluded for prior NSCLC, other chemotherapy for other malignancy, or radiation. We compared morbidity and mortality overall, and by subset analysis (clinical stage, pathological stage, procedure, and by protocol use) for both C+S and S patients.
Results. Demographics, comorbidities, and spirometry were similar. We noted no significant difference in overall or subset mortality or morbidity including pneumonia, acute respiratory distress syndrome, reintubation, tracheostomy, wound complications, or length of hospitalization.
Conclusions. C+S did not significantly affect morbidity or mortality overall, based on clinical stage, postoperative stage, or extent of resection. The potential for enhanced survival in resectable NSCLC justifies continued study of C+S.
| Introduction |
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To improve survival, multiple studies have explored the role of adjuvant therapies including pre- and postoperative chemotherapy and radiation for NSCLC. After disappointing results of postoperative chemotherapy with no improvement in survival [4, 5], most clinical trials in the past decade have explored preoperative chemotherapy or chemoradiation therapy to enhance local and systemic therapy in advanced stage (IIIA) lung cancer. Two small (single institution) prospective randomized trials showed benefit of this approach in stage IIIA NSCLC [6, 7]. However, several reports [811] have reported significant surgical morbidity and mortality associated with preoperative treatment.
We examined the influence of preoperative chemotherapy on surgical outcomes by comparing patients receiving preoperative chemotherapy (C+S) with patients undergoing surgery alone (S).
| Patients and methods |
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Data acquisition
Beginning in August 1996, we concurrently collected postoperative events (eg, any event that had an impact on the patients convalescence or treatment) and stored them electronically. At the time of discharge, the physician caring for the patient completed a scannable data sheet to record postoperative events. These events included pulmonary, cardiac, gastrointestinal, blood usage, wound infections, other wound problems, and other events. All database elements were prospectively defined within a database dictionary for consistency of data collection. These definitions allowed for a more precise use of clinical terms such as "adult respiratory distress syndrome" (ARDS) or "pneumonia," which are used differently by many authors [1216]. The collected data were reviewed monthly at our quality assurance (morbidity and mortality) conference. Data validity and quality was controlled at this conference by review of the physicians responsible for each patients care and by periodic selective randomized retrospective chart audits. All of the end points in this study were derived from this database. None of the end points was collected retrospectively.
Patients preoperative comorbidities were collected retrospectively by one of us (M.P.S.). Pulmonary function values were collected from our database. The extent of surgical resection was obtained by review of the operative reports. Surgical mortality was defined as any death occurring within 30 days, or after 30 days if the patient was continuously hospitalized after surgery.
Preoperative treatment
Multiple chemotherapy agents were used. These chemotherapy agents and the administration of chemotherapy on a clinical protocol or in an "ad hoc" manner were recorded. Time intervals between the last dose of chemotherapy and surgery as well as the number of chemotherapy cycles were recorded.
Clinical and pathologic staging
Preoperative clinical staging (cStage) was based on all information before definitive resection. These information sources included the patients preoperative clinic notes, radiology reports, review of selected computed tomography scans of the chest and all invasive staging methods such as bronchoscopy, mediastinoscopy, needle biopsy, or other techniques. Patients who responded to preoperative treatment (disappearance of N2 nodes or regression of the primary tumor on computed tomography scan) were clinically "down-staged" based on imaging information alone.
The postoperative (pathologic) stage (pStage) was obtained from our departmental database. After review by a trained research nurse, final pathology stage was based on the final written pathology report and operative findings. Pathological stage was further reviewed and validated by the senior surgeon responsible for that patient. Patients with two histologically different, concurrent tumors (4 patients) were staged by the more advanced TNM status of the two tumors.
Data analysis
Differences between the C and C+S treatment groups were tested for significance by the
2 test for categorical variables and the Students t test for continuous variables. The patients were analyzed by surgical procedure, cStage, pStage, and by chemotherapy given on a study protocol or in an "off protocol" setting. Statistical significance was defined as p less than 0.05. All statistical analyses were performed using SPSS software (SPSS Inc, Chicago, IL).
A logistic regression model was constructed with occurrence of a major complication as the dependent variable. Any hospital mortality, pneumonia, reintubation, tracheostomy, ARDS, empyema, bronchopleural fistula, wound complication, blood transfusion, readmit to hospital, or readmit to intensive care unit was defined as a major event. The other covariates included in the model were age, history of coronary artery disease, hypertension, or diabetes, preoperative treatment (chemotherapy versus no chemotherapy), pathologic stage (1,2 versus 3,4), and procedure (lobectomy, sleeve-resection, bilobectomy versus pneumonectomy).
| Results |
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Patient characteristics
The C+S and S alone groups had similar demographics (Table 1). The S group tended to be slightly older (median 65 versus 62.4 years, p = NS). Comorbidities, histology, and lung functions were also similar in both groups (Table 1). The stage distribution between the two groups was significantly different, with more early stage NSCLC (stages 1A, 1B) in the S group (p = 0.02).
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0.005) in the C+S group (Table 2). The extent of surgical resections performed in both groups was similar overall and in stage-specific analysis (Table 3).
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| Comment |
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We compared those factors that are known to influence surgical morbidity, including age, spirometry results, type of surgical resection, diabetes, coronary artery disease, and hypertension. We found no differences in our two study populations (C+S and S alone). The study groups appear to be similar on retrospective review; however, only a prospective randomized trial allows for stratification of these variables. We did not measure other risk factors that may influence surgical outcomes, including current smoking status, nutritional status, surgical incision, type of postoperative pain control, or results of the surgeons. Sophisticated risk scoring systems have been developed in several surgical specialties such as in trauma, critical care, and cardiac surgery [2326], and only recently such a risk scoring system has been tested for noncardiac thoracic surgery patients [27].
The preoperative side effects and complications of chemotherapy have been well documented in the two prospectively randomized controlled trials [6, 7]. Chemotherapy-related complications were also carefully reported in a recent phase 2 study for early stage NSCLC [17]. In this multicenter study of 94 patients, significant toxicity after preoperative paclitaxel and carboplatin included grade 3 to 4 neutropenia in 35% with no hospital admissions for febrile neutropenia. Also common were moderate (grade 2) myalgias and arthralgias in 26%. Most of these complications resolved within a week. More severe hematologic and neuromuscular complications were found in less than 5%. During induction chemotherapy in this study 1 patient (1%) died of a cerebrovascular accident while recovering from chemotherapy-induced toxicity, 96% of patients completed the preoperative chemotherapy, and 94% were operated on with intent to cure. Reasons for not undergoing an operation included disease progression (n = 3), loss to follow-up, unresectable status, or death in 1 patient each. Thirty-four of the 94 patients from that multicenter study were treated at our institution and included in our analysis. Morbidity induced by preoperative chemotherapy for early NSCLC appears to be acceptable. However, to further study this modality, a multi-institutional (phase III Intergroup) prospective randomized trial (SWOG S9900) is currently underway.
Patients in our study were not analyzed on an intent-to-treat basis. Only patients who underwent surgical resection were entered into our thoracic surgery database and analyzed. In contrast to advanced stage NSCLC [6, 7] there is currently no prospective evidence for a survival advantage after preoperative chemotherapy for stage 1 or 2 NSCLC; this treatment should be given only after informed consent in a protocol setting.
Given the intensity of chemotherapy combinations used, it appears surprising that no significant impact on surgical morbidity could be measured. Surgical outcomes were similar for patients if they were given chemotherapy on protocol or in an uncontrolled ad hoc setting, or if no chemotherapy was given. The number of patients in this series was large enough to measure surgical morbidity stratified by several risk groups, including clinical and pathological stage, extent of surgical resection, and protocol enrollment. Our study population and the number of events observed were not large enough to detect small differences in these surgical morbidities. A trend toward increased pulmonary morbidity in early stage lung cancers was noted in this study.
In summary, preoperative chemotherapy did not significantly affect morbidity or mortality overall, based on clinical or pathological stage, nor by the extent of the pulmonary resection performed. These data, coupled with the well-known preoperative side effects and complications of chemotherapy, justify continued study of preoperative chemotherapy for NSCLC.
| Acknowledgments |
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| Discussion |
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I think they are to be commended on two points. They certainly have a lucid and well-documented presentation that demonstrates the immense utility of a real-time data collection system for outcome assessment in patients. A methodology as straightforward and simple as what they described here, which involves recording data about patients at the time of discharge, followed by validation at the weekly or monthly quality assurance conferences, or mortality and morbidity conferences, I think is really invaluable. Not only does the real-time data recording result in ready data for answering clinical questions such as the one posed by the article here, but it is also useful for systematic evaluations and improvements in patient care. Most importantly, perhaps, this is a study in which the methodology and the data were designed, implemented, and managed by the surgeons who were involved in the patients care. So that in fact if anyone has any questions about the data they can provide answers quickly and easily.
The second major point I would like to emphasize is that I think the surgical outcomes here are excellent, particularly as demonstrated by the low mortality rate of only 1.7% in patients undergoing lobectomy after preoperative chemotherapy, certainly answering the question posed by the tile of the paper.
I have only three questions for the authors:
DR JOHN ROBERTS (Nashville, TN): I enjoyed your paper very much as well, and I had three quick questions.
First, I did not understand slide very well, but it appeared that you had a 4.5% mortality for the surgery-alone group. Is that true?
Second, fewer than 25% of your patients received preoperative chemotherapy. That surprises me for your institution. Do all of your III-A patients receive preoperative chemotherapy or do more of them go into chemoradiotherapy?
Finally, your data are at odds with the data that we presented at ASCO, and with the increased mortality that Elias found in the CALGB group study that was conducted a few years ago. I wondered if you had any comment about that?
DR MUHAMMAD MUMTAZ (Overland Park, KS): What was the protocol for chemotherapy and how much time did you wait before surgery? Did you have any patients that are not listed here that were initially going to have to go to a surgery arm but did not because of morbidity related to chemotherapy?
DR SIEGENTHALER: Thank you Dr Wain, for your kind comments and questions. I would like to start with your questions first.
What were the indications for chemotherapy? We tried to include every patient on our early stage protocol, which includes patients with stages 1b, 2a and b as well as the T3N1 group, which is a subgroup of stage 3a. This protocol is now available as the BLOT Intergroup trial. Every patient who is eligible and willing to participate in this trial gets enrolled. In all other patients, we would perform surgery alone. Only through a formal protocol can we determine a survival advantage.
Your second question addresses a possible down-staging effect, given the low incidence of pneumonectomy in the chemotherapy and surgery group. I think we have to be careful here. Our study group was fairly small. We also noted, when we correlated the clinical preoperative stage with the final postoperative stage, that there was a significant difference after preoperative chemotherapy. The chemotherapy group had a much higher number of patients that were down-staged, which again could be a sign of a treatment effect. The study population was too small and the patient selection was uncontrolled to make such a conclusion.
The third question was about the trend for an increased length of stay and pulmonary morbidity. I think there are uncontrolled factors, as you mentioned, which were not analyzed. An answer would be purely speculative. It might be a chemotherapy-associated effect. Ninety percent of our patients received Carboplatin and Taxol. The usual dose limiting toxicity for those agents is neuropathies and neurotoxicities, not bone marrow suppression. No routine growth factor support was used.
I think this also explains Dr Mumtazs first question. His second question was about the time interval between the surgery and chemotherapy. On the protocol, the surgery was usually performed 1 month after the last administration of chemotherapy. However, this was flexible if longer recovery from the chemotherapy was necessary. We collected the data about the timing between chemotherapy and surgery, but since we found no difference in the univariate analysis, we did not analyze the time interval further.
To Dr Roberts questions, mortality was higher in the surgery alone group, most likely due to the higher number of patients receiving pneumonectomy. The mortality rate was 5%. We did not find the same morbidity associated with preoperative chemotherapy that you found in your previous investigation. I cannot explain this difference between our institutions although our study population was larger. Your last question was why only 25% of patients received chemotherapy. I think the overall proportion was higher. Patients receiving preoperative chemo-radiation for stage 3a were excluded from the analysis. A high proportion of our clinical stage 3a patients received preoperative treatment. For earlier stages, however, we do not believe that chemotherapy should be given in an "off protocol" setting, since there is no hard data proving a survival benefit for this patient group.
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