1 Guidelines for the Diagnosis and Treatment of Malignant Pleural Mesothelioma Supported by:
2 Asbestos Diseases Research Institute 2013 Authors: Organising Committee Publisher: Asbestos Diseases Research Institute Published: July 2013 ISBN print ISBN electronic This work is copyright. Apart from any use as permitted under the Copyright Act 1968, no part may be reproduced by any process without prior written permission from The Asbestos Diseases Research Institute. Requests and enquiries concerning reproduction and rights should be addressed to: Asbestos Diseases Research Institute PO Box 3628 Rhodes NSW 2138 Australia Disclaimer This document is a general guide to appropriate practice, to be followed subject to the clinician s judgment and the patient s preference in each individual case. The guidelines are designed to provide information to assist in decision-making. They are based on the best evidence available at time of compilation. The guidelines are not meant to be prescriptive. Conflict of interest The development of these clinical practice guidelines has been undertaken by a working party of experts convened by the Asbestos Diseases Research Institute. Of the 47 experts involved five declared a potential conflict of interest. Advisory boards, and participation in educational meetings organised by the Pharma industry were mentioned as a source of potential conflicts of interests. The Guidelines Steering Committee reviewing the conflict of interest declarations concluded that the methodological rigor used for the evidence review and the involvement of many experts has effectively managed any conflict of interest real or perceived. None of the experts involved in the development of the Guidelines for the Diagnosis and Treatment of Malignant Pleural Mesothelioma has received remuneration for their activities. Three working party members, who were involved in reviewing and grading the available evidence, have received a modest compensation for the hundreds of hours spent on quality control. Suggested citation Organising Committee. Guidelines for the Diagnosis and Treatment of Malignant Pleural Mesothelioma. Asbestos Diseases Research Institute; Sydney: Publication Approval These guidelines were approved by the Chief Executive Officer of the National Health and Medical Research Council (NHMRC) on 2 July 2013, under Section 14A of the National Health and Medical Research Council Act In approving these guidelines the NHMRC considers that they meet the NHMRC standard for clinical practice guidelines. This approval is valid for a period of 5 years. NHMRC is satisfied that they are based on the systematic identification and synthesis of the best available scientific evidence and make clear recommendations for health professionals practising in an Australian health care setting. The NHMRC expects that all guidelines will be reviewed no less than once every five years. This publication reflects the views of the authors and not necessarily the views of the Australian Government.
3 Table of contents Foreword 2 Executive summary 4 Summary of recommendations 5 Consensus based recommendations 9 Clinical practice points Introduction Diagnosis Assessment Active anti-cancer treatment Palliative and supportive care Models of care 66 Appendix A: Future research areas 72 Appendix B: Committee details 72 Appendix C: Overview of guideline development process 79 Appendix D: NHMRC Evidence Statement Form 79 Appendix E: Abbreviations 80 Appendix F: Glossary 81 Appendix G: Conflict of Interest 85 Appendix H: Acknowledgments 85 References 86 Sponsorship/support The development of these Guidelines was made possible by a generous donation from the Biaggio Signorelli Foundation; a Cancer Institute NSW grant and a contribution from Cancer Council NSW.
4 Foreword 2 Malignant Pleural Mesothelioma (MPM), the asbestos-induced neoplasm originating in the mesothelial lining of the lung cavities represents significant diagnostic and therapeutic challenges for clinicians in Australia. Very seldom diagnosed prior to the advent of widespread asbestos mining in the early to mid-twentieth century, it has sharply risen in incidence over the last five decades. According to the most recent Australian Institute of Health and Welfare data, there were 666 cases of malignant mesothelioma diagnosed in Australia in 2009 and around 90% of them originated in the pleura. Malignant pleural mesothelioma is almost always a fatal disease and the prognosis can only be modestly influenced by oncological treatments. The diagnostic process can be complex, with highly specialised advice frequently required to arrive at a definite diagnosis. Treatment varies from therapeutic nihilism to radical combined-modality treatment approaches. Although the disease and its management have a huge impact on the social, emotional, and material wellbeing of patients and families, supportive and palliative care pathways appear to be under-developed. The development of guidelines under the auspices of the Asbestos Diseases Research Institute has been undertaken in response to these circumstances. The guidelines organize the diagnostic and assessment process along the lines of the scientific evidence available, and provide for tailoring treatment on the basis of each patient s characteristics. Considerable emphasis has been placed on investigating and addressing supportive and palliative care needs in MPM, however the volume and quality of evidence specific to MPM available in these domains was disappointingly small. MPM is almost exclusively a man-made disease and Australia has one of the highest burdens of MPM on a population basis in the world. For the experts involved in collating and assessing the literature on the management of MPM for these guidelines, the level of active Australian research in areas such as diagnostic techniques, prognostic assessment, advanced radiotherapy techniques, and surgical outcomes has been a source of gratification. Many of these developments remain in the research and development phase. These Guidelines for the Diagnosis and Treatment of Malignant Pleural Mesothelioma systematise the approach to the management of MPM based on the best available evidence in accordance with standards to the assessment of evidence developed by The National Health and Medical Research Council in 2011(1). The Asbestos Diseases Research Institute, and the national team of experts involved in the preparation of the Guidelines, intends that they be a source of reference for health practitioners and consumers, because optimal management, by adherence to best practice guidelines, will improve the quality of life for each patient with malignant pleural mesothelioma and their confidence in the treatment approach.
5 Guidelines for the Diagnosis and Treatment of Malignant Pleural Mesothelioma The development of Guidelines for the Diagnosis and Treatment of Malignant Pleural Mesothelioma has drawn on contributions from a large number of people. Particular thanks are due to the Steering Committee members who took responsibility for drafting each section of the Guidelines, to librarians Suzanne Bakker, Jeremy Cullis and Yaping Liu for the retrieval of relevant literature, to Christopher Clarke, Henry Marshall and Steven Leong for their detailed assessment and grading of evidence, and to Ms Victoria Keena of the Asbestos Diseases Research Institute whose energy and commitment over an extended period has been a source of strength to all. Many of these contributions were voluntary. All were beyond the strict call of duty. The reward for this effort will be in seeing these guidelines used widely leading to better outcomes for patients with MPM. 3 Andrew Penman Chair Guidelines, Steering Committee Nico van Zandwijk Director Asbestos Diseases Research Institute
6 Executive summary 4 Malignant mesothelioma is an aggressive tumour originating in the serosal membranes that line the thoracic and abdominal cavities. More than 90% of reported mesothelioma cases occur in the pleura. The occurrence of malignant mesothelioma is typically related to exposure to mineral fibres such as asbestos and erionite. The World Health Organization (WHO) has recognised asbestos as one of the most important occupational carcinogens and in 2010 upgraded its global estimate of asbestos-related diseases to 107,000 annual deaths. Australia, as one of the largest consumers of asbestos worldwide in the post-world War II period, has one of the highest incidences of malignant mesothelioma. The current epidemic of malignant mesothelioma is closely associated with past occupational exposure. Asbestos, however, persists in our natural and built environments, and it is important that we continue to minimise exposure to it by all reasonable means. There are indications that in Australia the diagnostic and treatment practices for malignant pleural mesothelioma are not equally distributed, with considerable expertise concentrated in some hospitals and lacking in others. Moreover, there are no guidelines that specifically consider diagnosis and treatment of this almost invariably fatal disease in the Australian context. These evidence-based guidelines have been developed by a multidisciplinary team of experts (volunteers) that is encouraging improved management of malignant pleural mesothelioma through evidencebased decision making. Guidelines are guides and not rules. A good approach is to be fully aware of appropriate guidelines before making management decisions.
7 Guidelines for the Diagnosis and Treatment of Malignant Pleural Mesothelioma Summary of recommendations Chapter 2 - Diagnosis Recommendations Grade* Page 1. CT-guided core biopsy or VAT-guided pleural biopsy is recommended A 27 depending on the clinical circumstances to obtain adequate tissue for histological analysis including immunohistochemistry, and has high sensitivity and specificity for the diagnosis of malignant pleural mesothelioma. 2. Cytological recognition of an atypical mesothelial proliferation in pleural C 27 effusion fluid from patients may be sufficient for diagnosis in some patients when correlated with the clinical background and imaging studies, and when biopsy is considered inadvisable or unnecessary. 3. It should be standard histopathological practice to subtype mesotheliomas B 28 into epithelial (epithelioid), sarcomatoid and biphasic types (and other rare variants) and the distinction between epithelial versus sarcomatoid mesothelioma carries prognostic significance. 4. A panel of immunohistochemical markers should be used for pathologic B 30 diagnosis of malignant pleural mesothelioma. 5. The immunohistochemical panels should contain positive (mesothelial) B 30 and negative (carcinoma-related) markers for malignant mesotheliomas with an epithelioid component and include at least one cytokeratin marker, at least two mesothelial markers and at least two carcinomarelated markers. 6. For pleural mesothelioma-like tumours with an epithelial component, it B 30 is recommended that immunolabelling for both calretinin and TTF-1 is routinely carried out. 7. Additional markers should be added when tumours other than lung B 30 cancer enter into the differential diagnosis. 8. The immunoprofile of sarcomatoid mesotheliomas including desmoplastic B 30 mesothelioma is more restricted than that for mesotheliomas with an epithelial component, with variable expression of markers such as cytokeratin 5/6, calretinin, WT1 and podoplanin (D2-40). Labelling for cytokeratins is important and can facilitate assessment of invasion. However, cytokeratin-negative sarcomatoid mesotheliomas are recognised. 9. Tissue invasion should be demonstrated by histology or imaging studies to B 32 diagnose malignant mesothelioma definitively. 10. Measurement of the blood SMRP level is not recommended for routine clinical diagnosis. B 32 5 *Grade of recommendation A = Body of evidence can be trusted to guide practice B = Body of evidence can be trusted to guide practice in most situations C = Body of evidence provides some support for recommendation(s) but care should be taken in its application D = Body of evidence is weak and recommendation must be applied with caution.
8 Chapter 3 - Assessment 6 Recommendations Grade* Page 11. The TNM system should be used for disease staging in mesothelioma. B Patients with suspected or confirmed malignant pleural mesothelioma A 36 diagnosis should be assessed for therapeutic planning with CT of the thorax and abdomen with contrast enhancement. 13. CT or ultrasonography should be used to guide biopsy and drainage of B 36 pleural effusion. 14. FDG-PET is a more sensitive modality than CT to detect possible lymph A 37 node involvement and distant metastatic disease, and should be performed when the presence of disease in these sites will influence a management plan. 15. FDG-PET-CT should be used in preference to FDG-PET where available. A MRI should not be part of a routine assessment of patients with B 38 mesothelioma. 17. MRI with gadolinium enhancement can be useful in specialised situations C 38 where it is important to delineate tumour extension in the diaphragm, endothoracic fascia, chest wall or through iatrogenic tumour seeding. 18. Mediastinoscopy is recommended as an additional staging procedure for B 39 patients being considered for radical surgery in order to exclude N2 level nodal disease or to confirm pathological involvement where imaging is equivocal. 19. The addition of EUS-FNA and or EBUS is feasible in mesothelioma and may C 39 identify additional N2, T4, and M1 disease. 20. Bilateral thoracoscopy and laparoscopy with peritoneal lavage may B 39 identify additional M1 disease or sarcomatoid histology and taking the potential morbidity associated with radical surgery into account extended (surgical) staging should be considered for all patients with malignant pleural mesothelioma before resection. 21. Baseline prognostic assessment should include evaluation of important 41 patient, clinical, biological and imaging factors. a. Epithelioid histological type and performance status 1 are relatively A favourable prognostic factors. b. Male sex, weight loss and chest pain are unfavourable prognostic B factors. c. Elevated white cell count is an unfavourable prognostic factor. B d. Other markers of inflammation also confer an unfavourable prognosis. C e. Measurement of either SUVmax or TGV by FDG-PET provides prognostic information in patients with MPM. C
9 Guidelines for the Diagnosis and Treatment of Malignant Pleural Mesothelioma Recommendations Grade* Page 22. During treatment: 42 a. Assessment of treatment response using quantitative FDG-PET B parameters is predictive of survival outcome. b. Nodal stage 1, minimal residual disease and epithelioid histology are A favourable prognostic factors. c. Increasing serum SMRP levels during treatment are an unfavourable B prognostic marker. 23. Following suspected recurrence: 42 a. FDG-PET-CT should be performed when a diagnosis of recurrence B after previous radical surgical therapy is equivocal on other imaging modalities. b. Measurement of SUVmax on FDG-PET-CT following post-surgical C relapse is predictive of survival outcome. 24. Pleurodesis status should be known when interpreting results of CT or B 43 FDG PET imaging. 25. The extent of pre-treatment evaluation, including radiological evaluation C 43 and assessment of clinical and laboratory prognostic factors should be considered in the context of potential and appropriate management options. 26. In patients being considered for radical treatment, assessment should C 43 include pulmonary and cardiac function testing and evaluation of psychological status and co-morbidities. 27. Pre-treatment evaluation of patients considered for chemotherapy should include assessment of co-morbidities and general fitness. C 43 7
10 Chapter 4 Active anti-cancer treatment 8 Recommendations Grade* Page 28. Combination chemotherapy (pemetrexed and cisplatin or carboplatin) A 46 rather than single drug treatment should be used as first-line systemic treatment for malignant pleural mesothelioma. 29. Thoracoscopic pleurodesis is an effective treatment option to control B 48 recurrent malignant pleural effusions in mesothelioma. 30. If the thoracoscopic pleurodesis is not appropriate or fails, palliative C 48 pleurectomy/decortication should be considered for symptom control. 31. Only patients with favourable prognostic features, and favourable A 51 histology and staging, should be referred for consideration of radical treatment involving extensive cytoreductive surgery. 32. Radical surgical approaches should be restricted to institutions with B 51 significant surgical experience and high volume of cases. 33. Extensive cytoreductive surgery should only be used as part of B 51 multimodality treatment. 34. Mesothelioma is sensitive to moderately high radiation doses and C 52 radiotherapy is advocated for palliation of symptomatic tumour masses arising from the pleural cavity or metastases in other locations. 35. For doses greater than 50 Gy, advanced radiotherapy technologies with C 53 strict constraints for contralateral lung doses are recommended to avoid excessive toxicity. 36. The administration of prophylactic radiotherapy following pleural interventions in patients with mesothelioma has no significant effect on changing the disease course and is not recommended. C 54 Chapter 5 Palliative and supportive care Recommendations Grade* Page 37. Pleurodesis should be used to prevent recurrent pleural effusions. B Regular oral low dose, sustained release opioids should be given to reduce the intensity of breathlessness. B 58
11 Guidelines for the Diagnosis and Treatment of Malignant Pleural Mesothelioma Consensus based recommendations Chapter 3 - Assessment Consensus based recommendation i: Routine mediastinoscopy and other invasive procedures are not indicated in patients receiving supportive care or palliative management with chemotherapy. Page 39 Chapter 4 - Active Anti-Cancer Treatment Consensus based recommendation ii: Immunologically based and targeted therapies for patients with malignant mesothelioma should be restricted to clinical trials. Page 47 Clinical practice points 9 Chapter 2 - Diagnosis Clinical practice points a: VAT is not only the gold standard for securing biopsy tissue for the pathological diagnosis, but it also allows effective drainage of pleural effusion and talc pleurodesis. b: It is recommended that unless loculation of the fluid or other physical constraints prevent adequate sampling of the effusion fluid a minimum of 100 ml of effusion fluid and preferably the entire volume of fluid is submitted for cytology (after sampling of small volumes for biochemical and microbiological assessment). Such sampling is advocated to allow recovery of sufficient numbers of cells for cell block sections and immunohistochemical studies. Page c: The anatomical site and extent of lesions should be determined. 31 d: When tissue invasion cannot be identified, the lesion should be designated as an atypical mesothelial proliferation. 32 Chapter 3 - Assessment Clinical practice point e: New-generation spiral CT should be used in imaging malignant pleural mesothelioma. Page 37
12 Chapter 4 Active anti-cancer treatment Clinical practice points f: A multidisciplinary team with sufficient experience should provide advice on the suitability of patients for trimodality therapy and the ongoing treatment strategy adopted. g: Patients whose MPM progresses despite induction (neoadjuvant) chemotherapy should not be offered cytoreductive surgery followed by hemithoracic radiotherapy. Page Chapter 5 Palliative and supportive care 10 Clinical practice points Page h: Patients with malignant mesothelioma should be referred to a palliative care 57 specialist in a timely manner, and on the basis of their needs. i: The WHO principles of cancer pain management for patients with malignant 57 mesothelioma should be followed. j: A specialist palliative care physician should be involved early as part of the 57 multidisciplinary oncology team for patients with refractory or unresponsive pain. k: Palliative radiotherapy should be considered for patients with painful chest wall 57 infiltration or nodules. l: In order to tailor information to a person s individual needs at a particular point in 59 time, it is necessary to: give clear information specific to the individual repeat and summarise important information encourage questions actively check the person s understanding, and provide additional written/ audiovisual information. m: Patients should be screened for psychological distress and unmet needs. 61 n: Patients and carers should be referred to appropriate counseling services when required. 62 o: Information, guidance and emotional support should be provided for carers. 62 p: Consultations should be provided with specialist nurses trained in the care of patients with malignant pleural mesothelioma. q: Practitioners dealing with MPM patients should be aware that legal remedies are available and the patient should be advised of this upon diagnosis
13 Guidelines for the Diagnosis and Treatment of Malignant Pleural Mesothelioma Chapter 6 Models of care Clinical practice points r: A multidisciplinary team approach will ensure consistency in patient management through the development of a multidisciplinary care plan that will guide patient treatment throughout their illness and provide support for their carers. s: Treating specialists and/or the MDT should establish communication with the patient s GP as soon as possible after diagnosis, and keep them informed about their patient s changing needs and whom they should contact for expert advice. t: Nurse care coordinators are important members of the MDT. They provide support and information to patients with mesothelioma, ensure timely and appropriate referrals, help navigate the patient through their disease journey and coordinate their multidisciplinary care. u: Where mesothelioma-specific treatment options, including surgery, are not available in a given centre, medical teams should refer patients to centres offering expert mesothelioma care for discussion of all potential treatment options and care planning. v: The frequency and type of follow-up should be determined by individual patient symptoms, the stage of the disease and the treatment goals. CT scanning is the most useful investigation for evaluating disease progress. w: Allied health professionals are important members of the MDT and contribute to symptom management and improved quality of life in patients with malignant mesothelioma. Page
14 1.0 Introduction 1.1 Background Malignant mesothelioma is an aggressive tumour that originates in the serosal membranes that line the thoracic and abdominal cavities. This disease has become an important health issue over recent years, with Australia having one of the highest reported incidences (2-4). More than 90% of reported cases of mesothelioma occur in the pleura, compared with 4 7% affecting the peritoneum, and fewer than 1% jointly occurring in the pericardium and tunica vaginalis testis (2, 4, 5). Even rarer cases have been recorded as apparently primary ovarian mesotheliomas (6, 7). The occurrence of malignant mesothelioma is typically related to exposure to mineral fibres such as asbestos and erionite (8-10). Asbestos is a collection of naturally occurring crystalline hydrated silicates that are resistant to high temperatures and humidity. Asbestos fibres are biopersistent (retained in the human body) and can be detected as asbestos bodies in the lung many years after inhalation (11). 12 The World Health Organization (WHO) has recognised asbestos as one of the most important occupational carcinogens and in 2010 upgraded its global estimate of asbestosrelated diseases to 107,000 annual deaths (12). 1.2 History of mesothelioma The first studies on the association between asbestos and malignant mesothelioma appeared in the 1950s. Weiss case report of asbestosis and pleural malignancy and Van der Schoot s paper describing three insulation workers with malignant disease were the first of many to be published (13, 14). Wagner confirmed the association between asbestos and malignant mesothelioma through his work in the 1950s in South Africa, a country that mined all three commercial types of asbestos (15). Because most asbestos exposure occurred in the work environment, malignant mesothelioma has traditionally been considered an occupational disease. Paraoccupational malignant mesothelioma has been described in households of asbestos workers in which cohabitants had been exposed via contaminated clothes (16). The term environmental malignant mesothelioma has been used to describe disease identified in people living close to asbestos mines or factories or when people have been exposed to asbestos or asbestos-like material present in the soil (17, 18). Other factors have been recognised as potential causes of malignant mesothelioma. Radiotherapy to the chest has been reported but the number of patients with this association is limited (19). The role of SV40 (one of the simian viruses) viral infection as an important etiologic cofactor in malignant mesothelioma remains under discussion (20, 21). Exposure to asbestos is more common in occupations with a predominantly male workforce, which explains why the current incidence of malignant mesothelioma is higher among men than women. Most mesothelioma patients have been primary asbestos workers or people who handled raw asbestos in the mining, milling, transportation and manufacturing of the material. As this high-risk occupational exposure has been limited by the total ban on the use of asbestos products in Australia, the exposure-mix may change to include a greater proportion of people who have been exposed in non-occupational settings.
15 Guidelines for the Diagnosis and Treatment of Malignant Pleural Mesothelioma A dose-response relationship between cumulative asbestos exposure (increased levels or duration of exposure, or both) and malignant mesothelioma has been demonstrated (22). A safe threshold of cumulative exposure, below which there is no increased risk, has not been defined (23). The latency period, or the period between first exposure to asbestos and the diagnosis of mesothelioma, shows a wide range (20 60 years) and there are indications that the latency in Australia has increased in recent years (24). The median age at diagnosis of malignant mesothelioma in Australia is slightly above 70 years, with many patients presenting with co-morbidities (4). 1.3 Incidence of malignant mesothelioma Variation in the incidence of malignant mesothelioma is reported in different parts of the world. For example, seven people per million in Japan have been diagnosed with malignant mesothelioma compared with 40 people per million in Australia. These differences are largely attributable to the amount of asbestos consumed in a certain period (25). Australia, as one of the largest consumers of asbestos worldwide in the post-world War II period, has one of the highest incidences of malignant mesothelioma. Around 660 new cases of malignant mesothelioma were documented in 2007 and, in terms of mortality, this disease is approaching the numbers of deaths caused by multiple myeloma and ovarian cancer. 13 There is also regional variation in the incidence of malignant mesothelioma. For example, in Australia the highest reported incidence has been in men in Western Australia. This variation is largely attributable to occupational exposure associated with crocidolite mining in Wittenoom (3). Most deaths caused by malignant mesothelioma in Australia and other developed countries are due to occupational exposure to asbestos. The frequency of cases attributable to occupational exposure may have begun to decline owing to stringent control of asbestos use and handling. Asbestos, however, persists in our natural and built environments, and it is important that we continue to minimise exposure to it by all reasonable means. Among mesothelioma patients who do not have a history of occupational exposure, there is now a high proportion of people with a history of home renovation, in which exposure to asbestos might have occurred (26). Research is needed to determine if asbestos exposure explains this high proportion. It is important also that we remain alert to sources of possible exposure to asbestos in the community and control any such exposure as it is identified. Data on the incidence and mortality of malignant mesothelioma in Aboriginal and Torres Strait Islanders and culturally and linguistically diverse groups has not been reliably estimated due to the lack of recorded ethnicity. However, from July 2010, all new cases of malignant mesothelioma diagnosed in Australia are monitored by the Australian Mesothelioma Registry.
16 1.4 Clinical need for these Guidelines A recent study highlighted the lack of standardisation or adherence to guidelines during diagnosis, treatment, and surveillance of cancer patients as one of the major barriers to providing high quality cancer care (27). According to the US Institute of Medicine (28), high quality health care must be: based on the best evidence efficient safe from avoidable errors delivered in a timely manner patient-centred equitable. 14 There is scant data available on the current medical practices for patients with malignant pleural mesothelioma in Australia. A report on 295 patients diagnosed with malignant mesothelioma in the 1980s found considerable variation in practice (29). There are indications that diagnostic and treatment practices are not equally distributed, with considerable expertise concentrated in some hospitals and lacking in others. Several clinical guidelines for malignant pleural mesothelioma have been published recently (21, 30-35). All were collated by experts but none of them used a systematic analysis of the literature retrieved through general search terms and PICO (patient, intervention, comparison, outcome) questions as required by the Australian National Health and Medical Research Council (NHMRC)(1). Moreover, there are no guidelines that specifically consider diagnosis and treatment of malignant pleural mesothelioma in the Australian context. To address this gap, a team of experts decided to write guidelines based on a systematic review of the available literature. These guidelines are based on a systematic review of the literature executed according to the NHMRC guidelines development plan (36). Primum non nocere was regarded a primary issue when formulating the guideline recommendations. In addition we have drafted five scenarios that have assisted us in selecting the most important PICO questions. Scenario A (Figure 1) is based on the most common presentation of patients with malignant mesothelioma those presenting with a pleural effusion. Scenario B depicts another (less frequent) pathway, when a patient presents with a pleural mass (Figure 2). In scenario C the assessment journey of patients with a pathologically confirmed diagnosis is outlined (Figure 3) and scenario D deals with treatment choices for malignant mesothelioma patients after diagnosis and assessment (Figure 4). Scenario E (Figure 5) depicts the second-line treatment choices. PICO questions were formulated according to these scenarios and literature searches were based on these PICO questions (see Tables ). The evidence found in the literature searches was graded to produce evidence-based recommendations applicable to the Australian clinical context. Although the cutoff date of the literature review was 31st October 2011, a few exceptions (eight) were made to include prominent articles that were published after this date, adding important new information. These guidelines will provide a benchmark for the evaluation of current patterns of care for patients with malignant pleural mesothelioma.
17 Guidelines for the Diagnosis and Treatment of Malignant Pleural Mesothelioma Scenario A: Presentation and Diagnosis Scenario A: Presentation and Diagnosis Diagnostic pleural aspiration Alternate diagnosis (not MPM) Pleural effusion requiring evaluation Suspicious for MPM - not fit - declines Pathological confirmation required Procedures: -VATS -Open Biopsy -TTNA -Mediastinoscopy -E(B)US FNA - Other Pathologically confirmed MPM 15 Not requiring pathological confirmation Figure 1. Scenario A. The most common presentation of a patient with malignant mesothelioma MPM Malignant Pleural Mesothelioma VATS Video-Assisted Thoracoscopic Surgery TTNA Trans-Thoracic Needle Aspiration E(B)US FNA Endobronchial or Esophageal Endoscopic Ultrasound-guided Fine Needle Aspiration
18 Scenario B: Presentation and Diagnosis Scenario B: Presentation and Diagnosis TTNA - Fine needle -- core No MPM 16 Pleural thickening or pleural mass requiring evaluation Pathologically confirmed MPM Open biopsy other biopsy VATS No MPM Figure 2. Scenario B. Pathway of a patient presenting with pleural thickening or pleural mass. MPM Malignant Pleural Mesothelioma TTNA Trans-Thoracic Needle Aspiration
19 Guidelines for the Diagnosis and Treatment of Malignant Pleural Mesothelioma Scenario C: Assessment additional investigations Scenario C: Assessment additional investigations Imaging -CT -PET -Other Pathologically confirmed MPM Requires staging and/or preoperative evaluation Functional / Performance -ECOG -Organ / -Cardiopulmonary function -QoL TNM stage + fitness MDT 17 Does not require staging or further evaluation LABS Figure 3. Scenario C. The journey of the MPM patient with a pathologically confirmed diagnosis. MPM Malignant Pleural Mesothelioma CT Computer tomography PET Positron emission tomography ECOG Performance Status QoL Quality of Life TNM Tumour, Node, Metastasis MDT Multidisciplinary Team
20 Scenario D: Treatment choices! Scenario D: Treatment choices 18 Pathologically confirmed MPM MDT & patient preference Anti-cancer Rx indicated Anti-cancer Rx options: -Trimodality -Chemo -RT -Surgery -other Not fit / not suitable / declines anti-cancer Rx Symptom relief options: -Pain -Dyspnoea -Malaise -other Figure 4. Scenario D. Treatment choices for MPM patients after diagnosis and assessment. MPM Malignant Pleural Mesothelioma MDT - Multidisciplinary Team Rx Therapy RT - Radiotherapy
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Malignant Malignant mesothelioma is a tumour originating from mesothelial cells. 85 95% of mesotheliomas are caused by asbestos exposure. It occurs much more commonly in the chest (malignant pleural mesothelioma)
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