Disease Name
Malignant mesothelioma (Malignant mesothelioma)
1) Disease Description (Causes and Symptoms)
- Causes and pathophysiology
- A malignant tumor of the mesothelium (pleura, peritoneum, and pericardium), most strongly associated with asbestos exposure.
- Because the latency period after asbestos exposure is very long (several decades, on average about 20–40 years), symptoms appear late.
- When the tumor invades the pleura, pleural thickening, pleural effusion formation, and compression of the lungs cause shortness of breath.
- Peritoneal mesothelioma can cause ascites, abdominal pain, and loss of appetite.
- Main symptoms
- Shortness of breath (most common), cough, chest pain (localized or referred pain), weight loss, fatigue, hoarseness, or difficulty swallowing.
- Pleural effusion or pleural thickening may be observed on chest X-ray/CT due to pleural fluid accumulation.
- Epidemiology (additional information)
- Even after the ban on asbestos use, an increasing incidence has been observed because of the long latency period (one report predicts that the number of patients will peak around 2045), and the disease is often already advanced at diagnosis.
- Prognosis summary
- As a progressive disease, it is often difficult to cure, and the average survival period after diagnosis is generally around 1 year (varies depending on the patient’s condition, stage, and treatment).
2) Treatment Methods
- Treatment goals
- Because a cure is often difficult, the main goals are prolonging survival and relieving symptoms (improving quality of life).
- Local surgery (selective)
- Considered in some patients who are eligible for complete resection and have good overall health.
- Types of surgery: pleurectomy/decortication (P/D) or extrapleural pneumonectomy (EPP), which includes removal of the lung. The choice of surgery is determined based on the stage, the patient’s condition, and the center’s experience.
- For peritoneal lesions: cytoreductive surgery + HIPEC (hyperthermic intraperitoneal chemotherapy) may be considered in selected patients.
- Systemic therapy (standard)
- First-line drug therapy: pemetrexed + cisplatin is the standard combination therapy.
- Targeted and antiangiogenic therapy: bevacizumab may be used in combination in research settings and in some guidelines (selectively).
- Immunotherapy: combinations of immune checkpoint inhibitors, such as nivolumab + ipilimumab, have shown a survival benefit in some patients (particularly those with unresectable pleural mesothelioma) and are often adopted (regional approval and guidelines must be checked).
- Radiation therapy
- Used as local palliative therapy (to control pain and symptoms caused by tumor invasion) or as adjuvant therapy after surgery. The overall survival benefit is limited.
- Management of pleural effusion and symptoms (symptomatic treatment)
- Thoracentesis, an indwelling pleural catheter (IPC), pleurodesis, and other treatments can relieve shortness of breath.
- Active coordination with oxygen therapy, analgesics, nutritional management, respiratory rehabilitation, and palliative care is recommended.
- Clinical trials
- Clinical trials evaluating new immunotherapies, targeted therapies, and combination therapies are active, so participation may be appropriate.
- Treatment-related precautions
- Because surgery, chemotherapy, and radiation all carry risks of adverse effects and complications (reduced respiratory function, infection, bone marrow suppression, etc.), multidisciplinary evaluation at a specialized center is important.
3) Checklist Before an Outpatient Visit (Items to Prepare and Things to Check)
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Items/materials to prepare
- A list of all medications currently being taken (including prescription drugs, over-the-counter medicines, herbal medicines, and supplements)
- Past medical history, surgical history, and allergy history
- Occupational history and asbestos exposure history (workplace, residence, previous work activities, timing and duration of exposure)
- Previous test results (chest X-ray, CT, PET-CT, pathology reports, etc.) or imaging files
- Records of symptom changes (degree of shortness of breath, cough, weight changes, location and intensity of pain, and when it began)
- Whether oxygen is currently required and whether assistive devices are being used
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Important information to tell the medical staff in advance when visiting the outpatient clinic
- Whether emergency symptoms such as acute shortness of breath, fever, or severe chest pain are present
- Possibility of pregnancy (may affect the treatment plan)
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Examples of questions to ask during the visit (brief)
- How much has my weight changed over the past 1–2 months?
- When did the shortness of breath begin, and in what situations does it worsen?
- Have I had occupational or environmental exposure that could suggest asbestos exposure?
4) Examples of General Questions to Ask the Doctor
- What is the stage and prognosis of this disease? (Estimated survival and treatment goals for my individual case)
- What is the most appropriate treatment option for me at present? (Why choose surgery, chemotherapy, immunotherapy, or a clinical trial?)
- What are the effectiveness and expected adverse effects of the first-line chemotherapy you recommend for me?
- How can shortness of breath caused by pleural effusion be managed most effectively?
- What precautions should I take regarding daily life, work, and exercise during treatment?
- Do I need to be referred to a clinical trial or a specialized treatment center (a center for severe rare cancers)?
5) Examples of Disease-Specific Questions
- In my case (based on imaging and pathology results), is the disease at a stage where complete surgical resection is possible? If so, which surgery do you recommend, P/D or EPP? What functional changes, particularly in breathing, can be expected after surgery?
- Are new treatments, such as immune checkpoint inhibitors (nivolumab + ipilimumab) or bevacizumab combination therapy, or a clinical trial appropriate for my situation? What is the likelihood of eligibility and the expected benefit?
- If peritoneal metastasis is confirmed (peritoneal mesothelioma), could you evaluate whether I meet the conditions for considering cytoreductive surgery + HIPEC?
Note: This information does not replace diagnosis or treatment decisions, and the optimal treatment varies depending on the individual patient’s condition. Please consult your treating specialist to decide how to proceed if you have suspicious symptoms or questions about your treatment plan.