How Is Mesothelioma Staged?
Doctors use the TNM system from the American Joint Committee on Cancer to determine the stage of pleural mesothelioma. This system evaluates three factors, including:
TNM System
- Tumor: How far the main tumor has spread into the pleura and nearby structures.
- Nodes: Whether cancer cells have spread to nearby lymph nodes.
- Metastasis: If the cancer has spread to distant organs such as the liver, bones or the other side of the chest.
The T, N and M values are combined to determine the overall stage, ranging from Stage 1 to Stage 4. A higher number means more advanced mesothelioma. Doctors may determine staging using imaging such as CT, PET, MRI, biopsies or surgery. The stage may be described as clinical (based on imaging before treatment) or pathological (confirmed after surgery).
GET A FREE CASE REVIEWThe Four Stages of Pleural Mesothelioma
The four stages of pleural mesothelioma indicate how far the cancer has spread. Stage 1 signifies minimal or no spread, while stage 4 reflects spread to other areas of the body. The TNM system is the staging method for pleural mesothelioma, which accounts for 80% to 90% of cases.
TMN Stage Comparison Table
| Stage | Spread | Typical Symptoms | General Treatment Approach |
|---|---|---|---|
| Stage 1 | Localized to one side of chest; no lymph node spread | Often none or mild | Surgery often an option; multimodal therapy possible |
| Stage 2 | Localized with lymph node spread on same side | Mild symptoms (cough, breathlessness) | Surgery often still possible |
| Stage 3 | Regional spread to nearby structures or distant lymph nodes | More pronounced symptoms; fatigue, weight loss | Case-by-case; combination approaches; some surgery possible |
| Stage 4 | Spread to distant organs or both sides of chest | Severe symptoms; difficulty swallowing, severe fatigue | Focus on quality of life; palliative care; surgery generally not recommended |
Stage 1 Mesothelioma
In Stage 1, the cancer remains confined to the pleura on one side of the chest. It has not spread to lymph nodes or distant parts of the body. Doctors classify stage 1 into two groups.
Stage 1 Pleural Mesothelioma
- Stage IA: The cancer affects the pleura lining the chest wall on one side of the chest and may also involve the pleura covering the diaphragm or the lung on that same side.
- Stage IB: The cancer involves the pleura lining the chest wall on one side and has spread into the diaphragm muscle or lung tissue.
Stage 1 diagnoses are rare because the symptoms may not be noticeable enough to prompt a doctor’s visit. However, if doctors can diagnose mesothelioma at this stage, more treatment options are available. Surgery-based multimodal therapy is a possibility for patients with Stage 1 mesothelioma.
START YOUR FREE CONSULTATIONStage 2 Mesothelioma
The cancer is still localized in Stage 2, but it has begun spreading to nearby tissue or lymph nodes on the same side of the chest as the primary tumor. It has not spread to distant parts of the body.
Symptoms can include shortness of breath, a persistent cough or mild chest pain. These early signs can often be mistaken for cold or flu symptoms.
Surgery may still be possible at this stage. Doctors might recommend surgical procedures combined with chemotherapy or other therapies for patients.
Stage 3 Mesothelioma
In stage 3, the cancer has spread regionally to nearby structures. It may have also spread to more distant lymph nodes. The typical symptoms of stage 3 mesothelioma are more pronounced and limiting. They can include breathlessness, coughing, chest pain, fatigue and possibly fever or weight loss.
Stage 3 Pleural Mesothelioma
- Stage IIIA: Cancer has spread to nearby tissues (such as the chest wall, mediastinum or pericardium) and lymph nodes on the same side of the chest. Surgery might still be possible in some cases.
- Stage IIIB: Cancer has spread to lymph nodes on the other side of the chest or above the collarbone. Or, cancer has spread too far for surgeons to remove it with surgery (e.g., it has invaded multiple areas of the chest wall, passed through the diaphragm or reached the spine or organs in the space between the lungs).
Treatment at this stage shifts toward combination approaches. Surgery candidacy is case-by-case. Many patients receive chemotherapy, immunotherapy or other non-surgical treatments. Doctors may use palliative care to manage symptoms.
Stage 4 Mesothelioma
Stage 4 is the most advanced stage. The cancer has spread to distant parts of the body, like the other side of the chest, the peritoneum (abdominal lining), the liver or bones. It may also have spread to nearby lymph nodes.
Symptoms of stage 4 mesothelioma are severe and uncomfortable. They may include difficulty breathing, trouble swallowing, chest pain, extreme fatigue, weight loss and sometimes fever or night sweats.
Treatment focuses on extending life and maintaining quality of life. Doctors may recommend chemotherapy, immunotherapy, radiation and palliative care to manage symptoms and provide comfort. Most doctors generally do not recommend surgery.
SPEAK WITH AN ATTORNEYPeritoneal Mesothelioma Staging
Doctors do not stage peritoneal mesothelioma with the four-stage TNM system used for pleural mesothelioma. Instead, they often use the Peritoneal Cancer Index score.
The PCI system divides the abdomen into 13 sections. Doctors assign each section a score from 0 to 3, depending on how much disease they observe. Those scores then determine the disease’s stage and progression.
Stages 1 and 2 of peritoneal mesothelioma generally have less extensive disease, so doctors may perform surgery. Stages 3 and 4 often involve extensive spread throughout the abdomen, so doctors may recommend chemotherapy, immunotherapy or palliative care.
PCI Stage Comparison Table
| Stage | PCI Score |
|---|---|
| Stage 1 | 1 – 10 |
| Stage 2 | 11 – 20 |
| Stage 3 | 21 – 30 |
| Stage 4 | 31 – 39 |
How Cell Type Affects Outlook Within a Stage
Two people at the same stage can have different outlooks depending on cell type. Staging alone does not capture this important factor.
Epithelial mesothelioma generally has a more favorable outlook than sarcomatoid, even at the same stage. This is why doctors assess cell type with stage when discussing treatment options.
Mesothelioma Cell Types
| Cell Type | Relative Outlook | Notes |
|---|---|---|
| Biphasic | Intermediate | Mixed cell features |
| Epithelial | Most favorable | About 70–78% of cases |
| Sarcomatoid | Least favorable | May affect surgical candidacy even at earlier stages |
Why Mesothelioma Is Often Diagnosed at a Later Stage
Most people are diagnosed with mesothelioma at stage 3 or 4 because of the disease’s latency period. The time between asbestos exposure and symptom onset can be 20 to 50 years.
Mesothelioma’s early symptoms, such as shortness of breath, cough and chest pain, are vague and mimic common conditions. Consequently, the cancer is often advanced by the time it is found.
A late-stage diagnosis does not make a claim weaker or ineligible. Our attorneys are known for representing clients at all stages and have recovered compensation for peritoneal and pleural mesothelioma alike.
What Your Stage and Diagnosis Date Mean for Your Legal Options
The statute of limitation is different in each state, starting with the date of diagnosis or the date of a person’s passing. A late-stage diagnosis does not make a claim weaker or ineligible.
Timing:
- Cross-state filing: A claim may sometimes be filed in a state other than where the person lives (e.g., where asbestos exposure occurred or where a defendant is located). This may affect the statute of limitations.
- Exceptions exist: The discovery rule, minority tolling and similar exceptions can affect deadlines. Timing is fact-specific.
- Trust-fund deadlines are separate: Asbestos trust funds have their own filing deadlines that operate independently of state lawsuit time limits.
Meirowitz & Wasserberg helps people who have received a mesothelioma diagnosis and their families understand their options. Our firm has recovered $500M+ for asbestos patients and we are dedicated to each mesothelioma case. Our free consultations are available to people with mesothelioma, regardless of staging.
Final-Stage Mesothelioma: What To Expect
In the final stages of mesothelioma, the cancer has spread extensively. Care focuses on comfort and quality of life. Palliative care and hospice services exist to manage symptoms, reduce pain and support families during this difficult time.
Even in Stage 4, our attorneys represent clients and recover compensation for both the patient and their family.
Frequently Asked Questions
What are the four stages of mesothelioma?
Stages 1 through 4 describe how far mesothelioma has spread, with stage 1 being localized and stage 4 indicating that the cancer has traveled to other parts of the body. These stages can vary slightly depending on whether doctors diagnose pleural or peritoneal mesothelioma and which staging system they use (TMN vs. PCI).
How is pleural mesothelioma staged?
Doctors use the TNM system from the AJCC to stage pleural mesothelioma. Staging may be based on imaging (CT, PET or MRI), biopsy and surgery.
What is stage 4 mesothelioma?
This is the most advanced stage where cancer has spread. Care focuses on extending life and maintaining quality of life.
What are the symptoms of stage 4 mesothelioma?
Symptoms of stage 4 mesothelioma are often more pronounced. They can include severe shortness of breath, chest or abdominal pain, fatigue, significant weight loss and fluid buildup.
How is peritoneal mesothelioma staged?
Doctors typically use the PCI to stage peritoneal mesothelioma. PCI scores range from 1 to 39 and correspond to stages 1 through 4 depending on the severity of the disease doctors assess throughout 13 sections of the patient’s abdomen.
Does the stage affect my legal claim?
No. The date of diagnosis, not the stage, generally starts the time limit to file. A later-stage diagnosis does not weaken a claim.
How is mesothelioma stage diagnosed or tested?
Doctors determine the stage of mesothelioma using imaging (CT, PET or MRI), biopsy and sometimes surgery.
Can mesothelioma be staged at diagnosis if it's already advanced?
Yes. Staging applies at any point. Doctors diagnose many people at stage 3 or 4 because the disease has a long latency period and vague early symptoms.
About The Author
Daniel Wasserberg
Founding Partner
Daniel Wasserberg, a founding partner of Meirowitz & Wasserberg, is a Best Lawyers-recognized and Super Lawyers-rated mesothelioma attorney with over 20 years of experience. Named a Top 100 Trial Lawyer and Top 10 Asbestos-Mesothelioma Lawyer, he leads the firm's national asbestos practice.
