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Journal of Clinical Oncology, Vol 24, No 10 (April 1), 2006: pp. 1561-1567 © 2006 American Society of Clinical Oncology. DOI: 10.1200/JCO.2005.04.6813
Phase I to II Study of Pleurectomy/Decortication and Intraoperative Intracavitary Hyperthermic Cisplatin Lavage for Mesothelioma
From the Brigham and Women's Hospital; Dana-Farber Cancer Institute; and Massachusetts General Hospital, Boston, MA Address reprint requests to David J. Sugarbaker, MD, Division of Thoracic Surgery, Brigham and Women's Hospital, 75 Francis St, Boston, MA 02115; e-mail: dsugarbaker{at}partners.org
PURPOSE: To evaluate morbidity, mortality, maximum-tolerated dose (MTD), and outcome of intraoperative intracavitary hyperthermic cisplatin lavage in patients undergoing pleurectomy for malignant pleural mesothelioma (MPM). PATIENTS AND METHODS: Sixty-one patients were prospectively registered. Forty-four resectable patients with MPM underwent pleurectomy, followed by a 1-hour lavage of the resection cavity with dose-escalated cisplatin (50, 100, 150, 175, 200, 225, and 250 mg/m2) at 42°C and then intravenous sodium thiosulfate (16 g/m2 over 6 hours). Survival estimates were compared using the log-rank test and proportional hazards regression. RESULTS: Median age was 71 years (range, 50 to 82 years). Twenty-four patients had epithelial tumors, and 20 had sarcomatous or mixed histology. Postoperative mortality was 11% (five of 44 patients). Dose-limiting renal toxicity occurred at 250 mg/m2, establishing the MTD at 225 mg/m2. Other morbidity included atrial fibrillation (14 of 44 patients, 32%) and deep venous thrombosis (four of 44 patients, 9%). Median survival time of all registered patients was 9 months, and the median survival time of resected patients was 13 months. Survival estimates differed significantly for resectable patients exposed to low doses (50 to 150 mg/m2; n = 9; median, 6 months) versus high doses (175 to 250 mg/m2; n = 35; median, 18 months) of hyperthermic cisplatin (P = .0019); recurrence-free interval also differed significantly (4 v 9 months, respectively; P < .0001). Low dose level (relative risk = 3.418) and nonepithelial histology (relative risk = 2.336) were independent risk factors for poor survival. Twenty patients with epithelial tumors who underwent high-dose cisplatin lavage had a 26-month median survival time. CONCLUSION: Pleurectomy and high-dose intraoperative intracavitary hyperthermic cisplatin lavage is feasible in this patient population with restricted surgical options. An apparent dose-related survival benefit warrants further study.
Malignant pleural mesothelioma (MPM) is an aggressive, usually fatal tumor of the pleura most often associated with exposure to asbestos. Patients treated with palliative care have a median survival time of 7 months from diagnosis.1 Doublet therapy with pemetrexed and cisplatin has been demonstrated to improve survival to 12.1 months compared with 9.3 months for cisplatin alone.2 Multimodality therapy including cytoreductive surgery with extrapleural pneumonectomy (EPP) followed by adjuvant chemoradiotherapy has been associated with a median survival time of 19 months.3 Patients who are not candidates for EPP as a result of insufficient cardiopulmonary reserve, advanced age, or disease distribution may be candidates for cytoreduction with pleurectomy/decortication (P/D). This procedure spares the lung while providing palliation of dyspnea by removing bulk tumor and pleural effusion.4,5 Long-term survival benefit has been limited by early disease recurrence. Hyperthermic intracavitary chemotherapy has been applied after surgical cytoreduction to enhance locoregional control for peritoneal mesothelioma,6 as well as other abdominal7-10 and thoracic11-13 malignancies including MPM.12,14 These studies have used cisplatin at 50 to 100 mg/m2. No studies to date have investigated the feasibility of intraoperative hyperthermic cisplatin lavage after P/D in MPM or determined the maximum-tolerated dose (MTD). We used hyperthermic cisplatin as an intraoperative lavage of the ipsilateral hemithorax. Sodium thiosulfate was sequentially administered intravenously after intracavitary lavage to protect against nephrotoxicity15,16 and to permit escalation of the cisplatin dose to obtain maximal cytotoxic levels of cisplatin within local tissues. An initial dose of 50 mg/m2 was used to minimize the likelihood of renal toxicity noted in prior reports of postpleurectomy intrapleural cisplatin administered at 100 mg/m2 (normothermic, without sodium thiosulfate).17,18
Objectives The primary objective of this study was to prospectively determine the MTD of intraoperative, intracavitary, hyperthermic cisplatin after P/D and to evaluate the feasibility, safety, morbidity, and mortality of this therapy. Secondary objectives were evaluation of the pattern and timing of disease recurrence and patient survival.
Eligibility and Enrollment
Surgery and Intraoperative Hyperthermic Lavage After tumor resection and hemostasis, a 1-hour intracavitary lavage was completed with a solution of cisplatin in dialysate (Baxter, Deerfield, MA) maintained at 42°C. An Omni retractor (Omni-Tract, Minneapolis, MN) and plastic adhesive drape were used to create a seal around the thoracotomy incision. The inflow and outflow catheters were placed through the open thoracotomy incision in the caudal and cephalad positions, respectively. The resection cavity was continuously bathed with circulating hyperthermic cisplatin solution. Immediately after the 1-hour cisplatin lavage, intravenous sodium thiosulfate was administered as a 4 g/m2 bolus in 250 mL of sterile water over 10 minutes followed by 12 g/m2 over 6 hours.16 Perfusate temperature was continuously monitored with thoracic and abdominal probes, and body temperature was monitored with an esophageal probe. A dose-escalation design was used. The cisplatin dose was sequentially escalated from 50 to 250 mg/m2. Three patients were treated at each dose level until a dose-limiting toxicity (DLT; grade 3 renal toxicity or any grade 4 toxicity not definitely related to the surgery) was encountered. When a single patient experienced a DLT, the number of patients treated at that dose level was expanded to six. Dose escalation was continued if none of three or only one of six patients experienced a DLT. If two or more patients experienced a DLT at a given dose level, the MTD was established at the previous lower dose. An additional 10 patients were then treated at the MTD to confirm the absence of toxicity.
Furosemide, low-dose dopamine, mannitol, or intravenous fluid was used to maintain urine output at
Pathology Review
Post-Treatment Follow-Up
Statistical Analysis
From August 1999 to April 2002, 61 patients were registered. Forty-four patients determined to be resectable at thoracotomy who underwent an MCR and intraoperative hyperthermic cisplatin lavage followed by intravenous sodium thiosulfate constituted the study cohort. This cohort had a median age of 71 years (range, 50 to 82 years). Thirty-two patients (73%) were male. Thirty-two patients (73%) had right-sided disease. Median preoperative forced expiratory volume in 1 second (FEV1) was 1.72 L or 60% predicted. Median predicted postpneumonectomy FEV1 was 0.76 L or 28% predicted. The median postoperative hospital length stay was 11 days (range, 6 to 71 days).
Pathology Review
MTD Patients were treated with increasing doses of cisplatin to determine the MTD. The following intrathoracic cisplatin doses (three patients at each dose) were initially tested in this protocol: 50, 100, 150, 175, 200, and 225 mg/m2. Because DLT had not occurred, an additional 10 patients were treated at 225 mg/m2 per protocol. The protocol was then amended to permit further escalation. DLT was experienced by two patients treated at the next level (250 mg/m2; one patient with grade 3 and one patient with grade 4 creatinine elevation20), establishing the MTD at 225 mg/m2. An additional 10 patients (23 total patients) were treated at the MTD without grade 3 toxicity.
Morbidity
Renal toxicity was observed in 25 patients (57%). Grade 4 renal toxicity occurred in one patient treated at 250 mg/m2 and represented a dose-limiting event. This patient required chronic dialysis and died on postoperative day (POD) 71 from Klebsiella pneumonia and ARDS. Transient episodes of grade 3 (three patients), grade 2 (four patients), and grade 1 (17 patients) renal toxicity also occurred.
Mortality
Survival
Among 35 patients treated with high-dose cisplatin lavage, the 20 patients with epithelial tumor histology had a 26-month median survival time. The median survival time of the 15 patients with nonepithelial tumors was nine months. Four of these patients (27%) died perioperatively, and five patients (33%) survived between 18 and 36 months (Fig 1E).
Patterns of Failure Nineteen (54%) of the 35 patients undergoing high-dose cisplatin lavage experienced ipsilateral recurrence, which is similar to the six (67%) of nine patients who underwent low-dose lavage. However, the recurrence-free interval was significantly related to cisplatin dose. Patients treated with high-dose cisplatin had a median recurrence-free interval of 9 months compared with 4 months for low-dose lavage (P < .0001; Fig 2).
This prospective study demonstrates the MTD (225 mg/m2) for intraoperative intracavitary hyperthermic cisplatin lavage with systemic sodium thiosulfate protection after cytoreductive surgery using a dose-escalating model. Furthermore, this study demonstrates that cytoreductive surgery and intracavitary cisplatin at or near the MTD is associated with longer survival in this cohort of patients compared with historic controls, unresectable patients, and patients treated with submaximal doses of intracavitary cisplatin. This treatment strategy may be considered an option for drug delivery in the context of MPM, a malignancy with a primarily local pattern of tumor growth and locoregional pattern of recurrence. Previously, P/D as therapy for MPM has primarily been used for palliation of dyspnea associated with lung encapsulation by tumor or pleural effusion4,5 or in cases of early disease where MCR of tumor seems possible while sparing the patient a pneumonectomy.17,21 Our study suggests an additional role for P/D, to provide tumor debulking in the context of aggressive local treatment of residual disease. The present study highlights the potential importance of cisplatin dose to outcome using this treatment strategy. Several prior studies have combined P/D with intrapleural cisplatin17,18,22 including hyperthermic lavage,14 but cisplatin was administered at dose levels (50 to 100 mg/m2) that we found, in the present study, to be associated with poor survival. One recent study using high-dose (450 mg/m2) intrapleural liposome-entrapped cisplatin without surgical debulking demonstrated pathologic responses in pleural biopsies but found that viable tumor remained in areas not accessible to the cavitary application, and median survival time was 11 months.23 Systemic protection with sodium thiosulfate in the present study permitted escalation of cisplatin dose to approximately twice the dose formerly used after resection. Our therapeutic strategy was associated with improved survival relative to historic controls.14,17,18,22 This result may reflect systemic effects of absorbed platinum in addition to effects of high-dose local application. However, the procedure has been associated with significant morbidity and mortality in some patients, stressing the need for careful patient selection. The 11% perioperative mortality rate is perhaps not entirely unexpected in an early-phase trial of aggressive therapy in a cohort of high-risk patients. Four of the five deaths occurred in the patients treated at a cisplatin dose of 225 to 250 mg/m2. Unfortunately, other factors found to correlate with perioperative death, such as reoperation (two patients), pneumonia (four patients), and ARDS (five patients), are not readily predictable preoperatively. Although hypercoagulabilty is known to be characteristic of some patients with MPM,24 the significant incidence of deep venous thrombosis in this study is consistent with the demonstrated influence of hyperthermia on the processes of platelet activation,25 fibrin formation,26 and fibrinolysis.27 Our current protocols mandate close monitoring of all patients during hospitalization with noninvasive lower extremity studies and a low threshold for instituting anticoagulation therapy. Some patients experienced creatinine elevation despite sodium thiosulfate administration. Because renal toxicity is an ever-present concern for some patients in the context of high-dose cisplatin, we have modified our perioperative management of these patients to optimize renal protection. Current protocols include preoperative hydration, 7-day hold of nonsteroidal anti-inflammatory drugs and cyclo-oxygenase 2 inhibitors, a second infusion of sodium thiosulfate, aggressive intraoperative diuresis and blood pressure management, and urine alkalinization. Tumors with epithelial histology have consistently been associated with improved outcome relative to sarcomatous or biphasic tumors, independent of treatment. This observation, combined with their disparate clinical behavior, leaves the impression that epithelial and sarcomatoid MPM variants represent distinct disease entities. Not surprisingly, most long-term survivors in the current trial had epithelial tumors, and nonepithelial histology was independently predictive of poor survival in multivariate analysis. Interestingly, though, survival among patients with nonepithelial tumors was bimodally distributed. Although most patients with mixed-histology tumors had early recurrence of disease with a maximal survival time of 9 months, five patients treated with cisplatin lavage at 225 or 250 mg/m2 survived beyond 18 months, suggesting that a subset of patients with mixed-histology tumors may benefit from cisplatin lavage at the MTD. This observation clearly warrants further investigation. A significant number of patients in the current study were treated at cisplatin doses that were higher than previously published. Although the current study was designed to address phase I questions and although the possibility of bias as a result of unequal distribution of node stage cannot be ruled out, the favorable survival and recurrence-free interval observed with higher doses compared with lower doses suggest the need to investigate further the efficacy of this approach. The present study used P/D as an alternative cytoreductive procedure. The pattern of recurrence was predominantly locoregional, despite the additional local treatment with intracavitary cisplatin. Significant differences in the completeness of cytoreduction may exist between EPP and P/D resulting from the potential with P/D for unresected tumor in segmental and lobar fissures, intraparenchymal and infradiaphragmatic lymph nodes, and pericardium. There are cases where meticulous pleurectomy combined with favorable tumor distribution may result in MCR. However, the potential for adjuvant radiation therapy will be much diminished in patients with retained pulmonary parenchyma. We believe that an MCR should be the primary goal of cytoreductive surgery when used in combination with adjuvant therapy. The selection of patients for either EPP or P/D should be determined by the disease distribution, the anticipated physiologic impact of resection on the patients cardiopulmonary status, and the availability of effective additional intraoperative and adjuvant therapy. This study has established the feasibility and MTD of hyperthermic cisplatin when administered intraoperatively after P/D in conjunction with sodium thiosulfate rescue. The observed survival of patients who underwent high-dose lavage is provocative and would seem to warrant further study. The present results establish the parameters for the administration of intraoperative cisplatin, which may provide the foundation for its use in combination with other drugs and biologic therapies.
The authors indicated no potential conflicts of interest.
We thank Emil Frei for guidance in designing this trial, John Godleski and Joseph Corson for participation on the Pathology Review Panel, Jasleen Kukreja for early editorial assistance, Amy Smith for data management, and Bruce Johnson for comments on the manuscript.
Presented in part at the 39th Annual Meeting of the American Society of Clinical Oncology, Chicago, IL, May 31-June 3, 2003. Authors' disclosures of potential conflicts of interest and author contributions are found at the end of this article.
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Copyright © 2006 by the American Society of Clinical Oncology, Online ISSN: 1527-7755. Print ISSN: 0732-183X
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