Wiener klinische Wochenschrift

, Volume 128, Issue 17–18, pp 618–626 | Cite as

Management of malignant pleural mesothelioma—part 2: therapeutic approaches

Consensus of the Austrian Mesothelioma Interest Group (AMIG)
  • Mir Alireza Hoda
  • Thomas Klikovits
  • Madeleine Arns
  • Karin Dieckmann
  • Sabine Zöchbauer-Müller
  • Christian Geltner
  • Bernhard Baumgartner
  • Peter Errhalt
  • Barbara Machan
  • Wolfgang Pohl
  • Jörg Hutter
  • Josef Eckmayr
  • Michael Studnicka
  • Martin Flicker
  • Peter Cerkl
  • Walter Klepetko
Open Access
consensus report

Summary

Treatment of malignant pleural mesothelioma (MPM) depends on performance status of the patient, tumor stage, and histological differentiation. Chemotherapy (CHT) can be administered as first- and second-line treatment in unresectable MPM or as neoadjuvant or adjuvant treatment before or after surgery. A combination of an antifolate and platinum-based CHT is the only approved standard of care. Several targeted and immunotherapies are in evaluation and further studies are warranted to determine the therapeutic value of these new treatment options. Radiotherapy (RT) can be considered either as adjuvant treatment after surgery or for palliation of pain-related tumor growth. Recent data support the use of RT in a neoadjuvant setting. Macroscopic complete resection by pleurectomy/decortication (P/D) or extrapleural pneumonectomy (EPP) is indicated in selected patients with good performance status. Surgery should only be applied as part of a multimodality treatment (MMT) in combination with chemo- and/or radiotherapy. In a large number of cases, palliative attempts are needed to improve quality of life and to achieve symptom control.

Keywords

Radiotherapy Surgery Multimodality treatment Palliative treatment Chemotherapy 

Introduction

Malignant pleural mesothelioma is a devastating disease and treatment is challenging. To date, there is no worldwide agreement on standardized treatment strategies. However, three treatment approaches—either combined or as single treatment—have evolved over the last decades: chemotherapy, radiotherapy, and surgery. Furthermore, intracavitary strategies such as intraoperative hyperthermic chemotherapy, photodynamic therapy and intrapleural gene and immunotherapy have been investigated as potential treatment options for local tumor control and prevention of recurrence of disease.

In the following we describe each approach and their combinations (multimodality protocols).

Chemotherapy

First-line treatment

The recommendations of a standard therapy with platinum-based CHT in combination with modern antifolates (pemetrexed or raltitrexed) are based on two randomized trials published in 2003 and 2005 [1, 2]. The median overall survival (OS) in the pemetrexed/cisplatin arm was 12.1 months versus 9.3 months in the control arm (p = 0.02). The median time to progression was significantly longer in the pemetrexed/cisplatin arm (5.7 months versus 3.9 months; p = 0.001). Although the cisplatin monotherapy was never compared to placebo in a randomized trial, these results enforced the recommendation for a combination chemotherapy. Carboplatin can be used as an acceptable alternative to cisplatin and may be better tolerated in elderly patients or patients with impaired functional status [3]. Other combination therapies as cisplatin + etoposide, methotrexate or interferon were tested but overall survival did not significantly improve compared to the combination of cisplatin with antifolates [4]. In principle, chemotherapy should be started as soon as possible after diagnosis. The duration of chemotherapy is 4–6 cycles of first-line therapy with cisplatin and pemetrexed. The experiences with this regimen derive from the treatment of NSCLC (Non-Small Cell Lung Cancer), where a therapy of four cycles is recommend usually. Six cycles are favored only in case of good overall response rates and lack of grade 3 and 4 toxicities.

Second-line treatment

For second-line therapy, no general recommendations exist because little data is available in the literature. A phase III evaluation of pemetrexed monotherapy did not show any survival benefit compared to best supportive care in previously treated patients [5]. However, there is evidence of better survival with chemotherapy versus best supportive care [6]. Vinorelbine monotherapy has demonstrated a trend towards improved OS in a phase II trial, as it was shown in the first-line setting [7, 8]. Since there is currently no standard second-line therapy, it is recommended to enroll patients in clinical trials.

Experimental approaches

Interleukins and interferons were tested in studies, as well as the application of targeted therapies with monoclonal antibodies. None of the following substances showed any survival benefit in several studies: thalidomide, gefitinib, erlotinib, or imatinib [9, 10, 11, 12, 13, 14]. The first approach in combining bevacizumab with cisplatin/gemcitabine failed to show any survival benefit [10]. However, recently presented data of a randomized phase III trial combining cisplatin/pemetrexed with bevacizumab showed significantly improved progression-free and overall survival in previously untreated unresectable MPM patients [15]. The results of this study might lead to a new paradigm in standard treatment in these patients. Newer targeted therapies and immunotherapies as tremelimumab or ipilimumab are currently under investigation [16, 17]. Furthermore, the new PD-1 inhibiting agent pembrolizumab has shown promising results in antitumor activity and randomized trials are still ongoing [18].

Radiotherapy

Currently, the most intensive treatment regime for pleural mesothelioma consists of a multimodality treatment combining chemotherapy, operation, and radiotherapy. However, there is still discussion whether patients actually benefit from the intensified treatment, as the long-term outcome is still poor independent of the combinations of treatment modalities. There are curative and palliative intentions to treat malignant pleura mesothelioma. In these settings radiotherapy can be performed as neoadjuvant, adjuvant, and palliative radiotherapy. The introduction of highly conformal radiotherapy technique (HCRT) improved dose delivery and target coverage in comparison to conventional 3‑dimensional conformal radiotherapy (3DCRT).

Neoadjuvant radiotherapy

The concept of the preoperative neoadjuvant treatment of the hemithorax can be performed for patients with resectable pleural mesothelioma.

This concept (SMART) aims at inactivation of the tumor and improvement of its resectability [19, 20]. Patients are treated with a hypofractionated radiotherapy, which means the application of a higher dose of 5 Gy on 5 consecutive days with an integrated boost of 6 Gy to the macroscopic tumor. The target volume encompasses the whole lung including the visceral and parietal pleura. To reduce the high dose to the organs at risk as esophagus, liver, heart, or spinal cord, intensity-modulated radiotherapy technique (IMRT), VMAT (volumetric modulated arch therapy), or Tomotherapy is the treatment of choice. After radiotherapy an extrapleural pneumonectomy (EPP) has to be performed within 8–10 days after the end of radiotherapy.

Adjuvant radiotherapy

Postoperative hemithoracic irradiation is regarded as part of the three modality treatment concept which combines chemotherapy, operation, and radiotherapy for resectable malignant pleural mesothelioma. The dose of 50–54 Gy should be applied with a once daily fraction of 1.8–2.0 Gy (Fig. 1).
Fig. 1

Postoperative situs after extrapleural pneumonectomy of the right lung and pleura. Intensity-modulated radiotherapy dose plan. Coronal, sagittal, and axial image of the isodose plan. Steep dose fall to the remaining left lung, liver, and kidney

Other fractionation schedules for 3D-conformal radiotherapy are recommended as 25 × 1.8 Gy (45 Gy) to the hemi thorax, followed by a boost onto the high-risk area with 7 × 1.8 Gy (12,6 Gy); or as another alternative 23 × 2 Gy (46 Gy) to the hemithorax, followed by 5 × 2 Gy boost which totals to 56–58 Gy for the high-risk area. In case of IMRT 26 × 1.75 Gy (45.5 Gy) with an integrated boost of 26 × 2.15 Gy (55.9 Gy) are possible [21].

Dose constrains to the organs at risk (OAR; as the non-involved lung, esophagus, spinal cord, liver or gastrointestinal organs, kidneys) have to be respected to avoid acute and long-term side effects as e. g. esophagitis and pneumonitis.

Radiotherapy should be initiated between 4–12 weeks after surgery depending on the wound healing process.

Palliative radiotherapy

For inoperable pleural mesothelioma, a palliative radiotherapy treatment can be indicated with and without chemotherapy.

In case of inoperability, generally it is not possible to irradiate the whole hemithorax without damaging the non-affected lung tissue. Therefore, the tumor can be partially treated at regions where it causes pain or at regions of high risk infiltration of spinal cord to avoid side effects as paresis in the future. Treatment time should be short, a 3D conformal radiotherapy or IMRT can be applied with higher single dose (single dose of 3–4 Gy up to a total dose of 30–40 Gy), taking into account that parts of the tumor are not irradiated and included into the clinical target volume (CTV).

Symptom-based radiotherapy treatments of metastasis can be performed in all locations to control local pain or neurological problems. Start of treatment should be as soon as possible after presentation of the patient to avoid longer hospitalization and to improve quality of life. Doses of 3–4 Gy up to doses of 30 to 40 Gy or single doses of 8 Gy reduce the treatment time as much as possible.

Re-irradiation with a reduced dose can be a treatment option in case of local relapse taking into account the primarily applied radiation dose and the dose at the OAR.

Surgery

Surgery for MPM can be applied in curative and palliative intention. Macroscopic complete resection (MCR) should be the goal of the respective surgical procedure. Recently, combined treatment modalities including radical surgery in terms of pleurectomy/decortication (P/D) or extrapleural pneumonectomy (EPP) are the most commonly used approaches for treating MPM in curative intention. Due to the difficulty of large randomized trials only institutional reports using different multimodality protocols and different surgical techniques are available to discuss whether P/D or EPP is the more appropriate procedure to obtain better long-term survival in relation to posttreatment quality of life.

After the IMIG 2012 meeting and much discussion on the role of surgery and the value of macroscopic complete resection the attendees agreed that (1) surgical macroscopic complete resection and control of micrometastatic disease play a vital role in the multimodality therapy of MPM, as it is the case for other solid malignancies. (2) Surgical cytoreduction is indicated when MCR is deemed achievable and (3) the type of surgery (EPP or P/D) depends on clinical factors and on individual surgical judgment and expertise [22].

Since the surgical technique of pleurectomy/decortication (P/D) in the treatment of MPM includes a variety of procedures with different clinical indications and therapeutic intents, the International Association for the Study of Lung Cancer (IASLC) and International Mesothelioma Interest Group (IMIG) have recently proposed a nomenclature for the different techniques [23]. Partial pleurectomy was defined as a cytoreductive procedure with partial removal of the visceral and/or parietal pleurae without the intention for macroscopic complete resection. P/D was defined as complete resection of the parietal and visceral pleurae and extended P/D as a technique with additional resection of the pericardium and diaphragm. A recent systematic review assessing the safety and efficacy of these techniques found that perioperative mortality and morbidity ranged from 0–11 % and 13–43 %, respectively. Median overall survival ranged from 7.1–31.7 months and disease-free survival ranged from 6–16 months [24]. A detailed analyses suggested similar perioperative mortality outcomes between different P/D techniques but a trend towards higher morbidity and length of hospitalization for patients who underwent extended P/D. However, overall and disease-free survival appeared to favor extended P/D compared to less aggressive techniques.

Extrapleural pneumonectomy (EPP) is a widely standardized surgical procedure with en bloc resection of the parietal and visceral pleurae with the ipsilateral lung, pericardium and diaphragm (Fig. 2) [25]. The role of EPP within multimodality approaches was recently extensively discussed after the publication of the Mesothelioma and Radical Surgery (MARS I) trial which aimed to assess the clinical outcomes of patients who were randomly assigned to EPP or no EPP in the context of trimodal therapy [26]. The results of the study suggested that radical surgery in the form of EPP within trimodality therapy offers no benefit and possibly harmed patients. However, the MARS I trial was designed to assess the feasibility of such a study and not to evaluate the risks and benefits of EPP. In order to sufficiently answer this question an actual number of 670 patients to identify a significant survival benefit would have been needed. A recent systematic review on the safety and efficacy of EPP for patients with MPM including 58 studies reported that median overall survival varied from 9.4–27.5 months, and 1‑, 2‑, and 5‑year survival rates ranged from 36–83 %, 5–59 %, and 0–24 %, respectively. Overall perioperative mortality rates were reported to range from 0–11.8 %, and the perioperative morbidity rates from 22–82 % [27]. Another recent retrospective evaluation of 3 high volume institutions including 251 patients completing EPP after platin-based induction treatment reported a 30-day mortality of 5 % and perioperative complication rate of 30 % [28]. However, according to the latest ERS/ESTS guidelines, EPP in a curative intent should only be performed at high volume centers in terms of a clinical study and within a multimodal treatment algorithm [29].

Multimodality treatment

Since several studies have shown that surgical treatment alone offers dismal prognosis only, multimodality approaches including chemo- and radiotherapy have been suggested in order to improve survival. Regarding the exact sequence of treatment modalities there are no randomized trials available to answer the question if chemo-, radio-, or combined chemo/radiotherapy should be used as induction treatment before surgery. With regard to EPP trimodality approaches, many high volume centers include chemotherapy as induction treatment followed by surgery and then by hemithoracic radiotherapy [30, 31]. The particular advantage of chemotherapy before surgery is a possible reduction of tumor load and downstaging, which may lead to a better understanding of the individual tumor biology and a more accurate patient selection. The possible effects of induction chemotherapy have recently been studied in a prospective multicenter trial including 61 patients being considered surgical candidates at diagnosis. Forty-five patients (74 %) underwent EPP and in 37 patients (61 %) the resection was complete. Postoperative radiotherapy was initiated in 36 patients. The median survival of all patients was 19.8 months. For the 45 patients undergoing EPP, the median survival was 23 months [32]. Another multimodal approach was recently introduced by the Toronto group which is currently under investigation in the Surgery for Mesothelioma After Radiation Therapy (SMART) trial. A short accelerated course of high-dose hemithoracic intensity-modulated radiation therapy (IMRT) is administered followed by EPP [19]. In all, 25 patients with resectable clinical stage T1-3N0M0 histologically proven, previously untreated MPM were included. Initial results revealed a cumulative 3‑year survival of 84 % in epithelial subtypes compared with 13 % in biphasic subtypes. Furthermore, the results suggested that this protocol is feasible without elevated perioperative morbidity and mortality. However, further prospective trials are needed in order to investigate the value of different multimodality strategies in the treatment of MPM.

Intracavitary treatment

Local recurrence is a frequent problem even after macroscopic complete resection and occurs in up to 60 % of the cases [31]. This may be caused by the infiltrative growing pattern of MPM to the surrounding tissue and the inability to achieve 100 % tumor-free margins (R0 resection) after resection. Recently, additional treatment approaches such as intracavitary chemo-, immuno-, or photodynamic therapy have been suggested to postoperatively secure resection margins and to lower the risk of local recurrence.

Intracavitary photodynamic therapy (PDT) combines a nontoxic photosensitizing compound with visible light and can be delivered intraoperatively after P/D or EPP [33]. The concept of PDT combined with radical pleurectomy was recently studied in 38 patients in predominantly stage III/IV disease with a median survival of 31.7 months for all 38 patients and 41.2 months for the 31/38 (82 %) patients with epithelial subtypes despite a median progression-free survival (PFS) of 9.6 and 15.1 only [34].

It has been proven that hyperthermic intraoperative chemotherapy (HIOC) is able to deliver a higher local dose chemotherapy to the resected surface with decreased toxicity compared to systemic therapy [35, 36]. The feasibility and effects of HIOC have recently been investigated in several phase II trials and extended interval to recurrence and overall survival have been reported in a group of patients with epithelioid MPM and low risk factors [37, 38, 39]. Other intracavitary concepts of binding cytotoxic (or other agents) to a fibrin carrier are currently evaluated in phase I and II trials. The concept of localized intracavitary cisplatin–fibrin chemotherapy after MCR is evaluated in a phase IIa trial to assess safety and toxicity of the treatment (NCT01644994 Influence Meso) [40].

Patient selection and prognostic factors

Taken all this information together, patients undergoing MCR for MPM must be meticulously selected in order to outweigh the benefits compared to the potential risks. Several studies have been published different prognostic factors and biomarkers for stratifying patients into different prognostic groups. A recent systematic review of prognostic factors and patient selection reported that those with non-epithelial MPM and nodal involvement have consistently demonstrated to have a worse prognosis after EPP [41]. Furthermore, several blood biomarkers have recently been investigated to identify patients who will benefit from surgical treatment. Among these, preinterventional C‑reactive protein (CRP) was found to predict benefit from multimodality treatment including radical surgery [42]. Patients with elevated CRP levels had a significantly shorter overall survival compared with those with normal CRP, which was confirmed in multivariate analyses. In other recent studies biomarkers such as fibrinogen, albumin, or MPM specific prognostic scores (currently under investigation, unpublished data) were reported to have prognostic impact and could be useful in clinical decision making [43, 44]. Moreover, a recent phase II study reported that progression-free survival could be useful as a prognostic marker for overall survival rather than response rates to chemotherapy. Patient data from 10 European Organisation for Research and Treatment of Cancer (EORTC) studies of first-line chemotherapy in MPM were pooled and progression-free survival at 18 weeks after randomization was strongly correlated and discriminated patients with better OS from the poorer prognosis patients [45].

Finally, there is not much data available on the quality of life (QoL) during and after treatment. A recent study has included QoL data in their institutional report and found a superiority of P/D over EPP in QoL after 6 and 12 months [46].Thus, the MARS trial reported that median quality of life scores were lower in the EPP group than the no EPP group; however, no significant differences between groups were reported in the quality of life analyses [26].

However, since MPM is a very heterogeneous disease with variability of clinical symptoms, stage, histology, tumor burden, and biological behavior, a multidisciplinary discussion of every patient considering age, performance status, and individual prognosis should be mandatory. All currently available therapeutic modalities in MPM are summerized in Table 1.

Palliative surgical procedures and symptom control

Usually, MPM is diagnosed at an advanced stage and symptom control is an important part of every curative and palliative therapy attempt [47]. Common symptoms are dyspnea due to pleural effusion (in early stages) or lung encasement by pleural thickening (in later stages), weight loss, cough, and chest pain caused by invasion of the thoracic wall. When dyspnea is caused by pleural effusion early drainage for symptom control is recommended followed by pleurodesis at first relapse [29]. Sterile talc powder is the preferred sclerosing agent for pleurodesis and can be installed through a chest drainage or during diagnostic VATS biopsy if the lung completely comes to expansion [29, 47]. Recurrent pleural effusions, especially in case of an entrapped lung can become more difficult to manage and indwelling pleural catheters may be the most practical way to manage recurrent pleural effusions [48, 49]. Furthermore, VATS partial pleurectomy (VATS-PP) has been suggested to improve symptom control and survival. Recently, the MesoVATS trial has randomized MPM patients to undergo VATS pleurectomy vs. talc pleurodesis via an indwelling intercostal chest drain or via thoracoscopy [50]. VATS-PP did not significantly improve survival and talc pleurodesis was considered to be preferable due to fewer complications and shorter hospital stay. However, VATS-PP significantly improved control of recurrent pleural effusions in the first 6 months after the procedure and improved QoL for 12 months.

Summary

At the time present, no worldwide accepted surgical therapy exists and the choice of procedure depends on tumor stage, clinical presentation, and especially on institutional expertise and preferences. Pooling of MPM patients in specialized centers is mandatory to improve results of surgical treatment within multimodality protocols. A proposed, stage-dependent treatment algorithm is depicted in Fig. 3.
Fig. 2

Surgical setting and intraoperative pictures of extrapleural pneumonectomy (EPP): a positioning of patient in OR; b situs after extrapleural mobilization of the lung; c lung, diaphragm, and pericardium have been removed; d situs after reconstruction of diaphragm and pericardium

Fig. 3

Proposed therapeutic algorithm in malignant pleural mesothelioma. MCR macroscopic complete resection, CHT chemotherapy, RT radiotherapy, DS downstaging, BSC best supportive care

Table 1

Main therapeutic approaches for the treatment of MPM

Chemotherapy

Neoadjuvant/adjuvant/palliative

Intraoperative:

HITOC/photodynamic therapy

New approaches

Targeted therapy

Immunotherapy

Radiotherapy

Adjuvant/neoadjuvant/palliative

Conventional RT/IMRT

Surgery

Macroscopic complete resection:

Extrapleural pneumonectomy

Extended pleurectomy/decortication (P/D)

Palliative approaches:

Partial pleurectomy/decortication (P/D)

Talc pleurodesis

HITOC hyperthermic intraoperative chemotherapy, RT radiotherapy, IMRT intensity modullated radiotherapy

Notes

Open access funding provided by Medical University of Vienna.

Conflict of interest

M.A. Hoda, T. Klikovits, M. Arns, K. Dieckmann, S. Zöchbauer-Müller, C. Geltner, B. Baumgartner, P. Errhalt, B. Machan, W. Pohl, J. Hutter, J. Eckmayr, M. Studnicka, M. Flicker, P. Cerkl, W. Klepetko, on behalf of the Austrian Mesothelioma Interest Group (AMIG) declare that they have no competing interests.

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© The Author(s) 2016

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • Mir Alireza Hoda
    • 1
  • Thomas Klikovits
    • 1
  • Madeleine Arns
    • 2
  • Karin Dieckmann
    • 3
  • Sabine Zöchbauer-Müller
    • 4
  • Christian Geltner
    • 5
  • Bernhard Baumgartner
    • 6
  • Peter Errhalt
    • 7
  • Barbara Machan
    • 8
  • Wolfgang Pohl
    • 9
  • Jörg Hutter
    • 10
  • Josef Eckmayr
    • 11
  • Michael Studnicka
    • 12
  • Martin Flicker
    • 13
  • Peter Cerkl
    • 14
  • Walter Klepetko
    • 1
  1. 1.Division of Thoracic Surgery, Department of Surgery, Comprehensive Cancer CenterMedical University ViennaViennaAustria
  2. 2.Department of PulmonologyLandesklinikum HocheggHocheggAustria
  3. 3.Department of Radiation OncologyMedical University ViennaViennaAustria
  4. 4.Department of OncologyMedical University ViennaViennaAustria
  5. 5.Department of PulmonologyKlinikum KlagenfurtKlagenfurtAustria
  6. 6.Department of PulmonologyLandeskrankenhaus VöklabruckVöklabruckAustria
  7. 7.Department of PulmonologyUniversity Clinic KremsKremsAustria
  8. 8.Rehabilitation Center TobelbadAllgemeine UnfallversicherungsanstaltTobelbadAustria
  9. 9.Department of PulmonologyKH Hietzing, Karl Landsteiner Institute for Clinical and Experimental PneumologyViennaAustria
  10. 10.Department of SurgeryUniversity Clinic SalzburgSalzburgAustria
  11. 11.Department of PulmonologyLandeskrankenhaus WelsWelsAustria
  12. 12.Department of PulmonologyUniversity Clinic SalzburgSalzburgAustria
  13. 13.Department of PulmonologyLandeskrankenhaus LeobenLeobenAustria
  14. 14.Department of PulmonologyLandeskrankenhaus HohenemsHohenemsAustria

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