WORKUP	Section 5 of 10

Lab Studies:

• Pleural fluid findings in patients with mesothelioma typically are not diagnostic. The specific gravity of the pleural fluid is nondiagnostic.

• Typically, patients have less than 1000 leukocytes/mL, few erythrocytes, elevated protein levels, and normal lactate dehydrogenase levels.

• Results of cytologic examination are occasionally positive for malignant mesothelial cells; however, most often the plural fluid cytology results are not diagnostic.

• Diagnosis is made based on the following:

• More than 90% of patients present with pleural effusion that decreases after thoracentesis. Cytologic examination findings are diagnostic in only 32% of patients and are suggestive in 56% of patients. Thoracoscopically guided biopsy should be performed if mesothelioma is suggested, and results are diagnostic in 98% of cases.

• Careful scrutiny of routinely stained biopsy preparations is the most valuable diagnostic tool for making a diagnosis. A battery of commercial immunohistochemistry stains (eg, for cytokeratins, vimentin, human milk fat globulin 2, anti-Leu M1, BerEP4, and carcinoembryonic antigen) can be used.

• Diagnostic features distinguishing malignant mesothelioma from adenocarcinoma include negative test results for periodic acid-Schiff stain, mucicarmine stain, carcinoembryonic antigen, and Leu M1 and positive test results for vimentin and cytokeratin. Electron microscopy reveals that cells have long microvilli, in contrast to adenocarcinomas, which have short microvilli. One of the new most intriguing markers is serum mesothelin-related protein (SMRP) measured in fluid or serum. The circulating SMRP level was reported to be elevated in 84% of patients with malignant mesothelioma and in 2% of patients with lung cancer.

• Recently, 4 new mesothelioma cell lines have been characterized based on ultrastructural and immunophenotypic analysis. Cell lines express vimentin, cytokeratins 8 and 18, and mesothelial antigen recognized by HBME-1 monoclonal antibody. Surface HLA class I and intercellular adhesion molecule I are present in all lines.

• While HLA class II and CD 86 are undetectable, HLA class II is present after interferon gamma stimulation. All cell lines display abnormal karyotypes with chromosome 6 abnormalities. The persistence of large T antigen with HLA class I and intercellular adhesion molecule I suggests large T antigen as a target for cytotoxic-based immunotherapy.

Imaging Studies:

• Imaging studies may include a chest radiograph, CT scan of the chest, MRI of the chest, and positron emission tomography scan. The latter is still considered investigational for helping differentiate between benign and malignant mesothelioma. The value of flurodeoxyglucose positron emission tomography (FDG-PET) was evaluated in 17 patients. The survival distribution in the group with high FDG uptake showed shorter survival compared with the low FDG group.

• The optimal preoperative staging procedures are debatable. In 1996, Sugarbaker et al recommend MRI as a standard part of staging. Others argue that laparoscopic thoracoscopy is the best way to determine the extent of the disease. Some argue that positron emission tomography scans may be helpful, but their role in staging needs to be defined. MRI performed with different pulse sequences and gadolinium-based contrast material can improve detection of tumor extension, especially to the chest wall and diaphragm. Positron emission tomography scans can provide metabolic and anatomic information, especially for those with extrathoracic or mediastinal metastasis.

• Determining the extent of disease by performing a laparoscopy or MRI and a cardiopulmonary evaluation is important, if the patient is amenable.

Other Tests:

• Measuring the diffusion capacity of the lung preoperatively is important because most patients have poor pulmonary reserve secondary to interstitial lung disease.

• A cardiopulmonary stress test with pharmacologic agents is a reasonable choice to eliminate the possibility of evidence of silent myocardial ischemia.

Procedures:

• See Lab Studies.

• Thoracoscopy or pleuroscopy should be performed to confirm the diagnosis.

• Laparoscopy is important for staging but is still investigational to evaluate for transdiaphragmatic involvement.

Staging: Six staging categories have been proposed. In 1996, Sugarbaker and associates proposed the Brigham staging system based on tumor resectability and nodal status, a system validated in a clinical trial. To date, the accepted system is the TNM classification accepted by the International Mesothelioma Interest Group (IMIG).

• Stage I - Completely resected within the capsule of the parietal pleura without adenopathy (ie, ipsilateral pleura, lung, pericardium, diaphragm, or chest wall disease limited to previous biopsy sites)

• Stage II - All stage I characteristics, with positive resection margins and/or intrapleural adenopathy

• Stage III - Local extension of disease into the chest wall or mediastinum, into the heart, through the diaphragm or peritoneum, or extrapleurally to involve the lymph nodes

• Stage IV - Distant metastatic disease

	TREATMENT	Section 6 of 10

Medical Care: Treatment options for the management of malignant mesothelioma include surgery, chemotherapy, radiation, and multimodality treatment.

• Chemotherapy
  • Currently, cisplatin as a single drug had been used as the standard drug for phase III clinical trials. None of the standard treatment options has improved survival. The most active agents are anthracycline, platinum, and alkylating agents; each produces a response rate of 10-20%.

  • Vogelzang et al presented the results of a phase III study of pemetrexed in combination with cisplatin versus cisplatin alone. Pemetrexed (500 mg/m²/d) and cisplatin (75 mg/m²/d) or cisplatin (75 mg/m²/d) was given on day 1. Both arms were given every 21 days. The median time to survival in the cisplatin/pemetrexed arm was 12.1 months versus 9.3 months for cisplatin alone. The response rate was 41.3% for the cisplatin/pemetrexed arm and 16.7% for the cisplatin arm. Folic acid and vitamin B-12 were given routinely to prevent the adverse effects of pemetrexed. This trial established the regimen as the standard choice for this disease.

  • A 1999 phase II study by Byrne et al using cisplatin (100 mg/m²) on day 1 and gemcitabine (1000 mg/m²) administered intravenously on days 1, 8, and 15 of a 28-day cycle for 6 cycles showed response rates of 47.6% (complete and partial response), 42.8% (stable disease), and 9.5% (progressive disease). The median response duration was 25 weeks, progression-free survival was 25 weeks, and the overall survival was 41 weeks. Toxicity was mainly gastroenterologic and hematologic in nature.

  • Several other combinations have been found to be active, including cisplatin/doxorubicin (Adriamycin)/mitomycin C, bleomycin/intrapleural hyaluronidase, cisplatin/doxorubicin (Adriamycin), carboplatin/gemcitabine, and cisplatin/vinblastine/mitomycin C. The cisplatin/gemcitabine combination has yielded the best results.

  • With the isolation of mesothelial cell lines, several chemotherapeutic agents are being tested actively to assess their efficacy. One explanation for the poor response to chemotherapy is the low apoptotic rate, as evidenced by low BCL2 and BAX expression. These data suggest that apoptosis is not a key phenomenon in mesothelioma development and histologic differentiation.

  • Numerous trials of chemotherapeutic agents have been performed; however, until recently, the studies were small, the staging systems used were different, and the measurements of disease were inaccurate.

• Radiation
  • Results with radiation therapy are also disappointing.

  • Radiation has no effect on survival, but it has caused significant palliation in 50% of patients treated for chest pain and chest wall metastasis.

• Trimodality therapy
  • This involves a combination of all 3 standard strategies (ie, surgery, chemotherapy, radiation).

  • One trimodality approach involved extrapleural pneumonectomy followed by combination chemotherapy and radiotherapy. Overall survival rates were 45% at 2 years and 22% at 5 years.

  • Lymph node involvement was a significant negative prognostic factor. The epithelial type had a better survival rate compared with the sarcomatous or mixed type (65% vs 20% at 2 y and 27% vs 0% at 5 y).

  • Survival based on the Brigham staging system was 22 months for stage I, 17 months for stage II, and 11 months for stage III.

  • Overall median survival was 17 months, yielding a 2-year survival rate of 36% and a 5-year survival rate of 14%. Epithelial cell type survival was better, with a 2-year survival rate of 68% and 5-year survival rate of 46%.

  • Different chemotherapeutic regimens found to be useful in the trimodality treatment include cyclophosphamide/doxorubicin (Adriamycin)/cisplatin, carboplatin/paclitaxel, and cisplatin/methotrexate/vinblastine. External beam radiotherapy is delivered in a standard fractionation over 5.5-6 weeks.

Surgical Care: Surgical resection has been relied upon because radiation and chemotherapy have been ineffective primary treatments. The 2 surgical procedures used are pleurectomy with decortication and extrapleural pneumonectomy.

• Pleurectomy with decortication is a more limited procedure and requires less cardiorespiratory reserve. It involves dissection of the parietal pleura, incision of the parietal pleura, and decortication of the visceral pleura followed by reconstruction. It has a morbidity rate of 25% and a mortality rate of 2%. It is a difficult procedure because the tumor encases the whole pleura; the local recurrence rate is high.

• Extrapleural pneumonectomy is a more extensive procedure and has a higher mortality rate. Recently, the mortality rate has been lowered to 3.8%. It involves dissection of the parietal pleura; division of the pulmonary vessels; and en bloc resection of the lung, pleura, pericardium, and diaphragm followed by reconstruction. It provides the best local control because it removes the entire pleural sac along with the lung parenchyma.

• With surgery alone, the recurrence rate is very high and most patients die after a few months. At least half the patients who have local control with surgery have distant metastasis upon autopsy.

Consultations:

• If an infection is suggested initially, consultation with a pulmonary specialist is essential if the infection does not resolve within 2 weeks with adequate antibiotic treatment.

• Chest radiographs are mandatory for follow-up if the infection has resolved. If the patient has diffuse calcification of the pleura and a history of weight loss with chronic cough, a full evaluation by a pulmonary specialist and oncologist is necessary.

• A referral for thoracoscopy is warranted if the diagnosis is considered and the initial workup is not diagnostic.

• Occupational history is important, and family members with exposure to asbestos should also be evaluated.

Diet:

• Patients are usually cachetic after surgery, chemotherapy, and radiation. Good supportive care and a regular nutritional status assessment are warranted. Patients should be referred to a nutritionist.

Activity:

• Beginning physical activity as soon as possible is important to prevent postoperative complications.

• Pulmonary physiotherapy is very helpful because of the extensive lung resection in such patients.

	MEDICATION	Section 7 of 10

Treatment options for the management of malignant mesothelioma include surgery, chemotherapy, radiation, and multimodality treatment. Currently, no therapy is considered standard. The standard methods of surgery, radiation, or chemotherapy alone have not improved survival (see Treatment).

Pemetrexed disodium was recently approved by the US Food and Drug Administration to treat patients with malignant pleural mesothelioma in unresectable disease and those who are not candidates for curative surgery. Several trials from a combination drug to therapy with pemetrexed have been performed. Hughes et al showed a 32% response rate using pemetrexed 500 mg/m² and carboplatin (AUC-5) on an every 21-day schedule. An interesting combination of drugs, including raltitrexed and oxaliplatin, have shown a response rate of 20% in previously treated patients.

Drug Category: Antineoplastic agents -- Interfere with cell reproduction. Some agents are cell-cycle specific, while others (eg, alkylating agents, anthracyclines, cisplatin) are not phase-specific. Cellular apoptosis (ie, programmed cell death) is also a potential mechanism of many antineoplastic agents.

Drug Name	Pemetrexed disodium (Alimta) -- Disrupts folate-dependent metabolic processes essential for cell replication. Specifically inhibits thymidylate synthase (TS), dihydrofolate reductase (DHFR), and glycinamide ribonucleotide formyltransferase (GARFT), which are folate-dependent enzymes involved in de novo biosynthesis of thymidine and purine nucleotides. Indicated in combination with cisplatin to treat patients with malignant pleural mesothelioma in unresectable disease and those who are not candidates for curative surgery.
Adult Dose	500 mg/m2 IV infused over 10 min on day 1 of 21-d cycle; administer cisplatin 75 mg/m2 IV infused over 2 h beginning 30 min after pemetrexed disodium infusion completed
Pediatric Dose	Not established
Contraindications	Documented hypersensitivity
Interactions	Coadministration with drugs that compete for renal tubular excretion (eg, probenecid) may decrease clearance; do not administer NSAIDs in cases of mild-to-moderate renal impairment (ie, CrCl, 45-79 mL/min), NSAIDs with short elimination half-life should not be administered for 2 d before administration and 2 d after; avoid NSAIDs with longer half-life 5 d before administration and 2 d after
Pregnancy	D - Unsafe in pregnancy
Precautions	Eliminated unchanged, primarily by renal excretion; insufficient data available with CrCl <45 mL/min; suppresses bone marrow function, dose-limiting toxicity is myelosuppression; common adverse effects include hematologic effects, fever, infection, stomatitis, pharyngitis, rash, and desquamation; pretreatment required with folate and vitamin B-12 supplementation (decreases hematologic and GI toxicity) and corticosteroids (decreases rash incidence); aggressive hydration required before and/or after cisplatin administration

Drug Name	Cisplatin (Platinol) -- Platinum-based alkylating agent. Inhibits DNA synthesis and, thus, cell proliferation by causing DNA crosslinks and denaturation of double helix. Indicated in combination with cisplatin to treat patients with malignant pleural mesothelioma in unresectable disease and those who are not candidates for curative surgery.
Adult Dose	75 mg/m2 IV infused over 2 h beginning 30 min after pemetrexed disodium infusion completed
Pediatric Dose	Not established
Contraindications	Documented hypersensitivity; preexisting renal insufficiency; myelosuppression; hearing impairment
Interactions	Increases toxicity of bleomycin and ethacrynic acid
Pregnancy	D - Unsafe in pregnancy
Precautions	Administer adequate hydration before and 24 h after cisplatin dosing to reduce risk of nephrotoxicity; myelosuppression, ototoxicity, nausea, and vomiting may occur

	FOLLOW-UP	Section 8 of 10

Further Inpatient Care:

• Factors predictive of poor survival by multivariate Cox analyses include the following:

• Poor Eastern Cooperative Oncology Group performance status (>1, less than ambulatory status)

• Pleural involvement

• Serum lactate dehydrogenase level of greater than 500 IU

• Chest pain

• Platelet count greater than 400,000/mL

• Nonepithelial histology

• Age older than 75 years

Further Outpatient Care:

• Regular follow-up visits with an internist, pulmonary specialist, medical oncologist, and radiation oncologist are recommended.

Complications:

• The tumor recurrence rate is 50% for those treated with surgery.

• The mortality rate secondary to surgery has improved. Even with extensive surgery, the mortality rate as reported by Huncharek et al and by Sugerbaker et al in 1996 was 3.8%.

Prognosis:

• Without treatment, mesothelioma is fatal within 4-8 months.

• With trimodality treatment, some patients have survived 16-19 months. A few have survived as long as 5 years, with rates of 14% for all types and 46% for the epithelial type. However, numbers are small.

	MISCELLANEOUS	Section 9 of 10

Medical/Legal Pitfalls:

• This is a difficult diagnosis so warn the pathologist if the index of suspicion is high. The diagnosis could be work-related, and a thorough discussion with the patient is warranted.

• The legal implications are tremendous, primary prevention is important, and employers should limit the amount of asbestos exposure to the lowest levels possible. Having work standards in place is important.

• A good working relationship among the occupational medicine specialist, the environmental hazard team, and the community at large is important.

Special Concerns:

• Other modalities of treatment being studied include gene therapy, cytokine-targeted therapy, and photodynamic therapy.

• Gene therapy: Phase I clinical trials have shown the safety of intratumoral gene transfer of recombinant adenovirus containing herpes simplex virus thymidine kinase, followed by ganciclovir treatment. Gene therapy trials are focusing on immunostimulation and using suicide gene therapy as a tumor vaccine. Studies are developing vaccines against simian virus 40, which is thought to be carcinogenic. Gene delivery of CD 40 ligand has shown promise in murine models of malignant mesothelioma.

• Cytokine-targeted therapy: This includes several agents, such as interleukin 2, interferon alfa, and tumor necrosis factor. Interleukin 2 in stages I and II produces an overall survival rate of 16 months. Interferon gamma has produced a partial response rate of 19%.

• Photodynamic therapy has been tried but has not produced improvement in survival.

	BIBLIOGRAPHY	Section 10 of 10

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NOTE:

Medicine is a constantly changing science and not all therapies are clearly established. New research changes drug and treatment therapies daily. The authors, editors, and publisher of this journal have used their best efforts to provide information that is up-to-date and accurate and is generally accepted within medical standards at the time of publication. However, as medical science is constantly changing and human error is always possible, the authors, editors, and publisher or any other party involved with the publication of this article do not warrant the information in this article is accurate or complete, nor are they responsible for omissions or errors in the article or for the results of using this information. The reader should confirm the information in this article from other sources prior to use. In particular, all drug doses, indications, and contraindications should be confirmed in the package insert. FULL DISCLAIMER

Mesothelioma excerpt