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J Thorac Cardiovasc Surg 2009;137:453-458
© 2009 The American Association for Thoracic Surgery
General Thoracic Surgery |
a Division of Thoracic Surgery and Department of Pathology, Brigham and Women's Hospital, Boston, Mass
b Department of Medicine, Brigham and Women's Hospital, Boston, Mass
c Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Mass
Received for publication January 25, 2008; revisions received June 6, 2008; accepted for publication July 17, 2008. * Address for reprints: Lambros Zellos, MD, MPH, 75 Francis St, Boston MA 02115. (Email: lzellos{at}partners.org).
| Abstract |
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Methods: Patients with mesothelioma were prospectively enrolled. Those with resectable disease received amifostine and 1-hour hyperthermic cisplatin perfusion of ipsilateral hemithorax and abdomen. Morbidity, recurrence, and survival were recorded.
Results: Forty-two patients were enrolled; 29 underwent resection (operative mortality 7%, 2/29). Median age was 57 years. Eighteen were in pathologic stage I or II; 11 were in stage III. Median hospitalization was 15 days. Common complications were atrial fibrillation (66%, 19 patients), deep venous thrombosis (31%, 9 patients), and grade 3+ renal toxicity (31%, 9 patients). Feasibility was determined. Renal toxicity was unrelated to cisplatin dose, with no maximum tolerated dose determined. Overall median survival was 17 months (resected 20 months, unresected 10 months). Median survivals were 26 months for patients receiving higher cisplatin doses and 16 months for those receiving lower doses (P = .35). Survival was significantly longer with negative extrapleural nodes (31 vs 14 months, P = .0115) and early stage (all resected 35 months for stage I–II vs 14 months for stage III, P = .0022, epithelial 39 months for stage I–II vs 15 months for stage III, P = .0072).
Conclusion: Early stage and negative extrapleural lymph nodes were associated with prolonged survival. Single-dose amifostine did not protect adequately against cisplatin-induced renal toxicity. Additional cytoprotective strategies are needed to allow determination of cisplatin maximum tolerated dose.
| Introduction |
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Cisplatin has been used extensively for locoregional perfusion in thoracic malignancies. We have recently published a phase I and II study of intraoperative locoregional cisplatin perfusion after pleurectomy for MPM that determined 225 mg/m2 to be the maximum tolerated dose (MTD), with a suggested survival advantage for patients who received higher doses of cisplatin within the limitations of a nonrandomized trial.6
The MTD for intraoperative locoregional cisplatin in the setting of EPP, however, has not been fully explored. The goal of achieving enhanced local drug delivery at the site of resection in the thorax by using higher doses of cisplatin has been limited by renal toxicity resulting from systemic absorption of the cisplatin. The relative effectiveness of pharmacologic renal cytoprotective strategies will likely impact the cisplatin MTD achieved in phase I studies. The use of an effective cytoprotective agent to preserve the kidney is appealing, particularly in the setting of EPP, in which traditional use of postoperative hydration to limit renal toxicity may be limited to avoid excessive contralateral lung fluid retention and resulting hypoxia in the postoperative period.
Our previous studies with intraoperative hyperthermic cisplatin (IOHC) have used sodium thiosulfate as a protective agent. Although sodium thiosulfate provides excellent renal protection, its mechanism of action involves inactivation of cisplatin and therefore may compromise cisplatin's potential therapeutic effect. For this reason, it is of interest to explore alternative strategies for renal protection in the setting of IOHC.
Amifostine (Ethyol, ALZA Corporation, Mountain View, Calif) has been added in various systemic chemotherapeutic protocols as a cytoprotective agent in regimens involving alkylating and platinum-related agents for head and neck, thoracic, and gynecologic malignancies, as well as melanoma.12-16
The preferential 100-fold uptake of amifostine by normal cells results in selective protection of normal tissues by intracellular radical salvage and binding of chemotherapeutic agents, with preservation of tumoricidal properties of cisplatin in the malignant cells. Single-dose amifostine has been used in cisplatin-based protocols and in this study was dosed according to the American Society of Clinical Oncology Clinical Practice Guidelines.16
We conducted this phase I study to determine the feasibility, toxicity, and MTD of cisplatin in patients undergoing intraoperative intrathoracic and intraperitoneal hyperthermic perfusion of cisplatin after EPP and after intravenous administration of amifostine.
| Materials and Methods |
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Surgical Technique and IOHC
Those patients who had less than 1 cm3 residual tumor, as evaluated with visual inspection by the operating surgeon, after the tumor was resected and before the diaphragmatic and pericardial reconstructions were performed, received the IOHC cisplatin perfusion for 1 hour in the chest and abdomen at 42°C. To reduce the renal toxicity of cisplatin and allow maximal dose escalation of cisplatin, intravenous amifostine was administered before the initiation of the intraoperative chemotherapy at a dose of 910 mg/m2 according to the American Society of Clinical Oncology Clinical Practice Guidelines.16
Intravenous fluids, dopamine, mannitol, and furosemide were used to maintain perfusion pressure and urinary output (at 100 mL/h) during the intrapleural cisplatin treatment and for 1 hour thereafter. At the conclusion of the IOHC perfusion, all the chemotherapy perfusate was evacuated, and the reconstructions were performed. Details of the technique have been described elsewhere.6,17
Follow-up
Patients were followed up after entry into the trial, and postoperative morbidity and mortality were recorded. Laboratory tests were done daily in the immediate postoperative period and at 2 weeks and 1 month postoperatively. Lower extremity venous ultrasonography was performed on postoperative day 7 or before discharge, according to the institutional review board–approved protocol, to evaluate for deep venous thrombosis. Echocardiograms were obtained at 1, 3, and 6 postoperative months to assess heart function, and computed tomography of the chest and abdomen was performed at least every 6 months, or sooner if symptoms arose, to monitor for recurrence of MPM. The recurrence-free interval after surgery and survival were recorded. Although no adjuvant therapy was included in the protocol, some patients received additional treatment off protocol at the discretion of their local physicians according to their clinical presentations and courses.
Statistical Analysis
The sample size of 19 to 53 patients was calculated by the institutional statistician and approved by the scientific review committee and institutional review board. The time to disease recurrence was defined as the interval between the date of surgery and the date of the first radiographically confirmed clinical recurrence. Survival was defined as the interval between the date of surgery and date of last follow-up or date of death. Kaplan–Meier curves of survival and time to recurrence were constructed 48 months after the last patient was registered. The log-rank statistic was used for univariate analysis of prognostic factors.
| Results |
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Maximum Tolerated Dose
The dose escalation, de-escalation, and revision of the protocol after consultation with the institutional review board in response to grade 3+ renal toxicity are shown in Table 3
. Overall, grade 3+ renal toxicity developed in 9 patients (31%), with 2 requiring temporary renal dialysis and 1 with permanent renal failure (Table 2). The median time to peak creatinine was 5 days, and the median time to recovery to baseline creatinine level was 16.5 days. This renal toxicity was unrelated to cisplatin dose and occurred at low and high cisplatin dose levels, resulting in premature closure of the protocol to accrual without determination of MTD.
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The median time to first recurrence among patients with resected disease was 16 months. Patients with epithelial histologic type had a 24-month median time to first recurrence, whereas patients with nonepithelial histologic type had a median time to first recurrence of 5 months (P = .0008). Patients with N2 nodes uninvolved with MPM had a 23-month median time to first recurrence where as patients with N2 nodes involved with MPM had a median time to recurrence of 9 months.
Initial recurrences involved the ipsilateral hemithorax alone in 5 patients (17%), the abdomen alone in 7 patients (24%), and the contralateral hemithorax in 3 patients (10%). Several patients had recurrence simultaneously at multiple sites. One patient (3%) had initial recurrence in both the ipsilateral hemithorax and the abdomen, 4 patients (14%) had initial recurrence in both the abdomen and the contralateral hemithorax, and 3 patients (10%) had simultaneous recurrence in all three cavities. Total recurrence in the ipsilateral hemithorax was 31% (9 patients), total recurrence in the abdomen was 52% (15 patients), and total recurrence in the contralateral hemithorax was 32% (10 patients).
| Discussion |
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Although amifostine alone was an ineffective cytoprotective agent, it had no obvious adverse effect on the efficacy of IOHC with cisplatin. The 100-fold preferential uptake of amifostine by normal cells relative to tumor cells, as opposed to the direct covalent binding of sodium thiosulfate to cisplatin in the circulating blood volume, provides more selective cytoprotection, with preservation of the cisplatin's therapeutic benefit. This is consistent with other studies that have used amifostine cytoprotection against platinum toxicity.12-15,18
For example, Betticher and associates14
reported that in a randomized phase II trial, addition of amifostine to carboplatin therapy reduced thrombocytopenia duration and hospitalization stay with no evidence of tumor protection by amifostine. Similarly, Schiller and colleagues12
used amifostine for cisplatin and vinblastine therapy for metastatic non–small cell lung cancer, with an excellent response rate and 17-month median survival. Addition of amifostine for renal protection resulted in a 12% rate of reversible grade 3 renal toxicity. In contrast, sodium thiosulfate binds covalently to inactivate cisplatin, providing excellent cytoprotection, but probably at the expense of some potential therapeutic benefit.
Cardiac and pulmonary complications constituted the primary nonrenal morbidities, similar to our previous published experience with EPP.1,17
The thrombotic morbidity has been noted in the context of hyperthermia19-21
and is equivalent to that in our previous IOHC studies.6,17
The mortality of 7% is comparable to those in published reports of EPP without IOHC.5
Although this study did not identify a dose at which amifostine protected the kidney, many of the patients have had extended survival relative to a historical control group. We have previously reported our experience with trimodality therapy involving EPP for MPM in a 183-patient cohort. In that study, positive margins, positive extrapleural lymph nodes, advanced stage of disease, and nonepithelial histologic type were found to adversely affect survival in this cohort of patients. Patients with stage I and II disease reported on here had a median survival of 32 months. This compares favorably with our previous experience with patients not receiving IOHC.1
Additional studies will be required to determine the optimal cytoprotective strategy for IOHC in this clinical setting. Although agents such as sodium thiosulfate are highly effective, our experience has consistently shown a negative impact of sodium thiosulfate on the therapeutic effect of cisplatin. For example, one study of EPP conducted by our group that used IOHC cisplatin with simultaneous infusion of sodium thiosulfate did not show a dose effect on survival.17
In contrast, the pleurectomy study with IOHC cisplatin followed by sodium thiosulfate infused after the IOHC perfusion6
did show a dose effect on survival, suggesting that concurrent sodium thiosulfate administration may have attenuated the cisplatin therapeutic effect in the EPP trial.17
One reasonable strategy for future trials would be to delay administration of sodium thiosulfate by a few hours, instead of administering it immediately at the conclusion of the chemotherapy perfusion, to determine whether a further increase in therapeutic effect could be achieved without increased renal toxicity.
The timing of amifostine administration is also critical to effective cytoprotection. Amifostine infusion needs to be initiated long enough before chemotherapy administration to allow intracellular distribution.16
Clearly, a single 910-mg/m2 amifostine dose was not sufficient to protect from cisplatin renal toxicity, and we no longer use this strategy alone for cytoprotection during IOHC. Further exploration of cytoprotective strategies is needed, and multiple doses of amifostine or a combination of amifostine and sodium thiosulfate may provide improved cytoprotection with greater therapeutic benefit.22-24
| References |
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