Symptoms of lung cancer are varied depending upon where and how widespread the tumor is. Warning signs of lung cancer are not always present or easy to identify. A person with lung cancer may have the following kinds of symptoms:
• No symptoms: In up to 25% of people who get lung cancer, the cancer is first discovered on a routine chest X-ray orCT scan as a solitary small mass sometimes called a coin lesion, since on a two-dimensional X-ray or CT scan, the round tumor looks like a coin. These patients with small, single masses often report no symptoms at the time the cancer is discovered.
• Symptoms related to the cancer: The growth of the cancer and invasion of lung tissues and surrounding tissue may interfere with breathing, leading to symptoms such as cough, shortness of breath, wheezing, chest pain, and coughing up blood (hemoptysis). If the cancer has invaded nerves, for example, it may cause shoulder pain that travels down the outside of the arm (called Pancoast's syndrome) or paralysis of the vocal cords leading to hoarseness. Invasion of the esophagus may lead to difficulty swallowing (dysphagia). If a large airway is obstructed, collapse of a portion of the lung may occur and cause infections (abscesses, pneumonia) in the obstructed area.
• Symptoms related to metastasis: Lung cancer that has spread to the bones may produce excruciating pain at the sites of bone involvement. Cancer that has spread to the brain may cause a number of neurologic symptoms that may include blurred vision, headaches, seizures, or symptoms of stroke such as weakness or loss of sensation in parts of the body.
• Paraneoplastic symptoms: Lung cancers frequently are accompanied by symptoms that result from production of hormone-like substances by the tumor cells. These paraneoplastic syndromes occur most commonly with SCLC but may be seen with any tumor type. A common paraneoplastic syndrome associated with SCLC is the production of a hormone called adrenocorticotrophic hormone (ACTH) by the cancer cells, leading to oversecretion of the hormone cortisol by the adrenal glands (Cushing's syndrome). The most frequent paraneoplastic syndrome seen with NSCLC is the production of a substance similar to parathyroid hormone, resulting in elevated levels of calcium in the bloodstream.
• Nonspecific symptoms: Nonspecific symptoms seen with many cancers, including lung cancers, include weight loss, weakness, and fatigue. Psychological symptoms such as depression and mood changes are also common.
When should one consult a doctor?
One should consult a health-care provider if he or she develops the symptoms associated with lung cancer, in particular, if they have
• a new persistent cough or worsening of an existing chronic cough
• blood in the sputum,
• persistent bronchitis or repeated respiratory infections
• chest pain
• unexplained weight loss and/or fatigue
• breathing difficulties such as shortness of breath or wheezing.
Monday, July 5, 2010
What are the signs and symptoms of lung cancer?
Symptoms of lung cancer are varied depending upon where and how widespread the tumor is. Warning signs of lung cancer are not always present or easy to identify. A person with lung cancer may have the following kinds of symptoms:
• No symptoms: In up to 25% of people who get lung cancer, the cancer is first discovered on a routine chest X-ray orCT scan as a solitary small mass sometimes called a coin lesion, since on a two-dimensional X-ray or CT scan, the round tumor looks like a coin. These patients with small, single masses often report no symptoms at the time the cancer is discovered.
• Symptoms related to the cancer: The growth of the cancer and invasion of lung tissues and surrounding tissue may interfere with breathing, leading to symptoms such as cough, shortness of breath, wheezing, chest pain, and coughing up blood (hemoptysis). If the cancer has invaded nerves, for example, it may cause shoulder pain that travels down the outside of the arm (called Pancoast's syndrome) or paralysis of the vocal cords leading to hoarseness. Invasion of the esophagus may lead to difficulty swallowing (dysphagia). If a large airway is obstructed, collapse of a portion of the lung may occur and cause infections (abscesses, pneumonia) in the obstructed area.
• Symptoms related to metastasis: Lung cancer that has spread to the bones may produce excruciating pain at the sites of bone involvement. Cancer that has spread to the brain may cause a number of neurologic symptoms that may include blurred vision, headaches, seizures, or symptoms of stroke such as weakness or loss of sensation in parts of the body.
• Paraneoplastic symptoms: Lung cancers frequently are accompanied by symptoms that result from production of hormone-like substances by the tumor cells. These paraneoplastic syndromes occur most commonly with SCLC but may be seen with any tumor type. A common paraneoplastic syndrome associated with SCLC is the production of a hormone called adrenocorticotrophic hormone (ACTH) by the cancer cells, leading to oversecretion of the hormone cortisol by the adrenal glands (Cushing's syndrome). The most frequent paraneoplastic syndrome seen with NSCLC is the production of a substance similar to parathyroid hormone, resulting in elevated levels of calcium in the bloodstream.
• Nonspecific symptoms: Nonspecific symptoms seen with many cancers, including lung cancers, include weight loss, weakness, and fatigue. Psychological symptoms such as depression and mood changes are also common.
When should one consult a doctor?
One should consult a health-care provider if he or she develops the symptoms associated with lung cancer, in particular, if they have
• a new persistent cough or worsening of an existing chronic cough
• blood in the sputum,
• persistent bronchitis or repeated respiratory infections
• chest pain
• unexplained weight loss and/or fatigue
• breathing difficulties such as shortness of breath or wheezing.
• No symptoms: In up to 25% of people who get lung cancer, the cancer is first discovered on a routine chest X-ray orCT scan as a solitary small mass sometimes called a coin lesion, since on a two-dimensional X-ray or CT scan, the round tumor looks like a coin. These patients with small, single masses often report no symptoms at the time the cancer is discovered.
• Symptoms related to the cancer: The growth of the cancer and invasion of lung tissues and surrounding tissue may interfere with breathing, leading to symptoms such as cough, shortness of breath, wheezing, chest pain, and coughing up blood (hemoptysis). If the cancer has invaded nerves, for example, it may cause shoulder pain that travels down the outside of the arm (called Pancoast's syndrome) or paralysis of the vocal cords leading to hoarseness. Invasion of the esophagus may lead to difficulty swallowing (dysphagia). If a large airway is obstructed, collapse of a portion of the lung may occur and cause infections (abscesses, pneumonia) in the obstructed area.
• Symptoms related to metastasis: Lung cancer that has spread to the bones may produce excruciating pain at the sites of bone involvement. Cancer that has spread to the brain may cause a number of neurologic symptoms that may include blurred vision, headaches, seizures, or symptoms of stroke such as weakness or loss of sensation in parts of the body.
• Paraneoplastic symptoms: Lung cancers frequently are accompanied by symptoms that result from production of hormone-like substances by the tumor cells. These paraneoplastic syndromes occur most commonly with SCLC but may be seen with any tumor type. A common paraneoplastic syndrome associated with SCLC is the production of a hormone called adrenocorticotrophic hormone (ACTH) by the cancer cells, leading to oversecretion of the hormone cortisol by the adrenal glands (Cushing's syndrome). The most frequent paraneoplastic syndrome seen with NSCLC is the production of a substance similar to parathyroid hormone, resulting in elevated levels of calcium in the bloodstream.
• Nonspecific symptoms: Nonspecific symptoms seen with many cancers, including lung cancers, include weight loss, weakness, and fatigue. Psychological symptoms such as depression and mood changes are also common.
When should one consult a doctor?
One should consult a health-care provider if he or she develops the symptoms associated with lung cancer, in particular, if they have
• a new persistent cough or worsening of an existing chronic cough
• blood in the sputum,
• persistent bronchitis or repeated respiratory infections
• chest pain
• unexplained weight loss and/or fatigue
• breathing difficulties such as shortness of breath or wheezing.
What are the types of lung cancer?
Lung cancers, also known as bronchogenic carcinomas, are broadly classified into two types: small cell lung cancers (SCLC) and non-small cell lung cancers (NSCLC). This classification is based upon the microscopic appearance of the tumor cells themselves. These two types of cancers grow and spread in different ways and may have different treatment options, so a distinction between these two types is important.
SCLC comprise about 20% of lung cancers and are the most aggressive and rapidly growing of all lung cancers. SCLC are strongly related to cigarette smoking, with only 1% of these tumors occurring in nonsmokers. SCLC metastasize rapidly to many sites within the body and are most often discovered after they have spread extensively. Referring to a specific cell appearance often seen when examining samples of SCLC under the microscope, these cancers are sometimes called oat cell carcinomas.
NSCLC are the most common lung cancers, accounting for about 80% of all lung cancers. NSCLC can be divided into three main types that are named based upon the type of cells found in the tumor:
• Adenocarcinomas are the most commonly seen type of NSCLC in the U.S. and comprise up to 50% of NSCLC. While adenocarcinomas are associated with smoking, like other lung cancers, this type is observed as well in nonsmokers who develop lung cancer. Most adenocarcinomas arise in the outer, or peripheral, areas of the lungs. Bronchioloalveolar carcinoma is a subtype of adenocarcinoma that frequently develops at multiple sites in the lungs and spreads along the preexisting alveolar walls.
• Squamous cell carcinomas were formerly more common than adenocarcinomas; at present, they account for about 30% of NSCLC. Also known as epidermoid carcinomas, squamous cell cancers arise most frequently in the central chest area in the bronchi.
• Large cell carcinomas, sometimes referred to as undifferentiated carcinomas, are the least common type of NSCLC.
• Mixtures of different types of NSCLC are also seen.
Other types of cancers can arise in the lung; these types are much less common than NSCLC and SCLC and together comprise only 5%-10% of lung cancers:
• Bronchial carcinoids account for up to 5% of lung cancers. These tumors are generally small (3-4 cm or less) when diagnosed and occur most commonly in people under 40 years of age. Unrelated to cigarette smoking, carcinoid tumors can metastasize, and a small proportion of these tumors secrete hormone-like substances that may cause specific symptoms related to the hormone being produced. Carcinoids generally grow and spread more slowly than bronchogenic cancers, and many are detected early enough to be amenable to surgical resection.
• Cancers of supporting lung tissue such as smooth muscle, blood vessels, or cells involved in the immune response can rarely occur in the lung.
As discussed previously, metastatic cancers from other primary tumors in the body are often found in the lung. Tumors from anywhere in the body may spread to the lungs either through the bloodstream, through the lymphatic system, or directly from nearby organs. Metastatic tumors are most often multiple, scattered throughout the lung, and concentrated in the peripheral rather than central areas of the lung.
why Lungs Cancer Occur
Smoking
The incidence of lung cancer is strongly correlated with cigarette smoking, with about 90% of lung cancers arising as a result of tobacco use. The risk of lung cancer increases with the number of cigarettes smoked and the time over which smoking has occurred; doctors refer to this risk in terms of pack-years of smoking history (the number of packs of cigarettes smoked per day multiplied by the number of years smoked). For example, a person who has smoked two packs of cigarettes per day for 10 years has a 20 pack-year smoking history. While the risk of lung cancer is increased with even a 10-pack-year smoking history, those with 30-pack-year histories or more are considered to have the greatest risk for the development of lung cancer. Among those who smoke two or more packs of cigarettes per day, one in seven will die of lung cancer.
Pipe and cigar smoking also can cause lung cancer, although the risk is not as high as with cigarette smoking. Thus, while someone who smokes one pack of cigarettes per day has a risk for the development of lung cancer that is 25 times higher than a nonsmoker, pipe and cigar smokers have a risk of lung cancer that is about five times that of a nonsmoker.
Tobacco smoke contains over 4,000 chemical compounds, many of which have been shown to be cancer-causing or carcinogenic. The two primary carcinogens in tobacco smoke are chemicals known as nitrosamines and polycyclic aromatic hydrocarbons. The risk of developing lung cancer decreases each year following smoking cessation as normal cells grow and replace damaged cells in the lung. In former smokers, the risk of developing lung cancer begins to approach that of a nonsmoker about 15 years after cessation of smoking.
Passive Smoking
Passive smoking or the inhalation of tobacco smoke by nonsmokers who share living or working quarters with smokers, also is an established risk factor for the development of lung cancer. Research has shown that nonsmokers who reside with a smoker have a 24% increase in risk for developing lung cancer when compared with nonsmokers who do not reside with a smoker. An estimated 3,000 lung cancer deaths that occur each year in the U.S. are attributable to passive smoking.
Asbestos Fibers
Asbestos fibers are silicate fibers that can persist for a lifetime in lung tissue following exposure to asbestos. The workplace is a common source of exposure to asbestos fibers, as asbestos was widely used in the past as both thermal and acoustic insulation. Today, asbestos use is limited or banned in many countries, including the U.S. Both lung cancer and mesothelioma (cancer of the pleura of the lung as well as of the lining of the abdominal cavity called the peritoneum) are associated with exposure to asbestos. Cigarette smoking drastically increases the chance of developing an asbestos-related lung cancer in workers exposed to asbestos. Asbestos workers who do not smoke have a fivefold greater risk of developing lung cancer than nonsmokers, but asbestos workers who smoke have a risk that is 50- to 90-fold greater than nonsmokers.
Radon Gas
Radon gas is a natural, chemically inert gas that is a natural decay product of uranium. Uranium decays to form products, including radon, that emit a type of ionizing radiation. Radon gas is a known cause of lung cancer, with an estimated 12% of lung-cancer deaths attributable to radon gas, or about 20,000 lung-cancer-related deaths annually in the U.S., making radon the second leading cause of lung cancer in the U.S. As with asbestos exposure, concomitant smoking greatly increases the risk of lung cancer with radon exposure. Radon gas can travel up through soil and enter homes through gaps in the foundation, pipes, drains, or other openings. The U.S. Environmental Protection Agency estimates that one out of every 15 homes in the U.S. contains dangerous levels of radon gas. Radon gas is invisible and odorless, but it can be detected with simple test kits.
Familial Predisposition
While the majority of lung cancers are associated with tobacco smoking, the fact that not all smokers eventually develop lung cancer suggests that other factors, such as individual genetic susceptibility, may play a role in the causation of lung cancer. Numerous studies have shown that lung cancer is more likely to occur in both smoking and non-smoking relatives of those who have had lung cancer than in the general population. Recently, the largest genetic study of lung cancer ever conducted, involving over 10,000 people from 18 countries and led by the International Agency for Research on Cancer (IARC), identified a small region in the genome (DNA) that contains genes that appear to confer an increased susceptibility to lung cancer in smokers. The specific genes, located the q arm of chromosome 15, code for proteins that interact with nicotineand other tobacco toxins (nicotinic acetylcholine receptor genes).
Lung Diseases
The presence of certain diseases of the lung, notably chronic obstructive pulmonary disease (COPD), is associated with an increased risk (four- to sixfold the risk of a nonsmoker) for the development of lung cancer even after the effects of concomitant cigarette smoking are excluded.
Prior History of Lung Cancer
Survivors of lung cancer have a greater risk of developing a second lung cancer than the general population has of developing a first lung cancer. Survivors of non-small cell lung cancers (NSCLCs, see below) have an additive risk of 1%-2% per year for developing a second lung cancer. In survivors of small cell lung cancers (SCLCs, see below), the risk for development of second lung cancers approaches 6% per year.
Air Pollution
Air pollution from vehicles, industry, and power plants can raise the likelihood of developing lung cancer in exposed individuals. Up to 1% of lung cancer deaths are attributable to breathing polluted air, and experts believe that prolonged exposure to highly polluted air can carry a risk for the development of lung cancer similar to that of passive smoking.
Lungs Cancer
Lung cancer is a disease of uncontrolled cell growth in tissues of the lung. This growth may lead to metastasis, which is the invasion of adjacent tissue and infiltration beyond the lungs. The vast majority of primary lung cancers are carcinomas of the lung, derived from epithelial cells. Lung cancer, the most common cause of cancer-related death in men and women, is responsible for 1.3 million deaths worldwide annually, as of 2004. The most commonsymptoms are shortness of breath, coughing (including coughing up blood), and weight loss.
The main types of lung cancer are small cell lung carcinoma and non-small cell lung carcinoma. This distinction is important, because the treatment varies; non-small cell lung carcinoma (NSCLC) is sometimes treated with surgery, while small cell lung carcinoma (SCLC) usually responds better to chemotherapy and radiation. The most common cause of lung cancer is long-term exposure to tobacco smoke. The occurrence of lung cancer in nonsmokers, who account for as many as 15% of cases, is often attributed to a combination of genetic factors, radon gas, asbestos, and air pollution including secondhand smoke.
Lung cancer may be seen on chest radiograph and computed tomography (CT scan). The diagnosis is confirmed with a biopsy. This is usually performed by bronchoscopy or CT-guided biopsy. Treatment and prognosis depend upon the histological type of cancer, the stage (degree of spread), and the patient's performance status. Possible treatments include surgery,chemotherapy, and radiotherapy. Depending on the stage and treatment, the five-year survival rate is 14%.
Thursday, July 1, 2010
Promising Research in Early Detection of Mesothelioma
Mesothelioma, once a rare cancer, has become more prevalent in the past 50 years. The incidence of this aggressive disease, which has no cure, is expected to rise through 2015.
Until recently, mesothelioma was considered universally fatal. Patients treated with the best available therapy have survived 13 to 25 months in some studies, and with only supportive care the median survival is about 9 months. Studies investigating the diagnosis of mesothelioma have recently reported promising results, which may help reverse this tragic trend.
If caught before spreading beyond the lungs, there is a much greater chance of successfully treating the disease. Once mesothelioma has spread, the disease quickly overcomes its victim. With earlier detection, current treatments would be more effective, more aggressive treatment could be developed and life expectancy could rise dramatically.
One of the challenges of treatment for mesothelioma patients is the inability to detect the aggressive cancer in its early stages. Unfortunately, mesothelioma is very challenging to diagnose until the advanced stages. Because the onset of disease is delayed for as much as 30 years beyond exposure, symptoms are vague and the diagnostic tools are not efficient or specific, many cases are not diagnosed until the disease is advanced.
To date, screening through serial chest x-rays and pulmonary function testing has not been effective in detecting the disease in its earlier stages. While some asbestos related disease has been detected, these methods cannot differentiate between mesothelioma and benign lung disorders. Computer tomography (CT) can detect even small tumors, but also does not distinguish between malignant lesions and benign lung changes. Thus, the stumbling block to early diagnosis is distinguishing early stage cancer from other lung problems.
Biomarkers, or naturally occurring chemicals that can be detected in the blood have been linked to many specific cancers. Studies have shown a link between the substance TPA and mesothelioma, but this correlation had not yet been proven. Ca 125, a known marker for ovarian cancer has also shown promising but unconfirmed results in detecting early stage mesothelioma.
According to a recent article published in the December 2005 New England Journal of Medicine, a recent study of the protein osteopontin produced encouraging results. Comparing patients diagnosed with mesothelioma, patients exposed to asbestos but disease free and healthy control subjects, revealed clear differences in the patients with malignant disease. Although more research is needed to confirm the accuracy of this investigation, a strong correlation between osteopontin levels and mesothelioma was found.
A significantly higher concentration of osteopontin was detected in patients with diagnosed cases of mesothelioma compared to subjects with asbestos exposure. When compared, the levels of osteopontin were not significantly different in unexposed control subjects versus those subjects exposed to asbestos. Nearly 78% of mesothelioma patients showed elevated osteopontin levels. Levels were elevated in both patients with early stage disease (Stage I) and advanced disease. In over 85% of cases, osteopontin levels differentiated patients with mesothelioma versus benign lung conditions.
Definitive detection of mesothelioma in the earlier stages makes surgical removal of tumors possible before the disease has had a chance to spread. Once spread occurs, the effectiveness of surgical treatment drops dramatically. In end?stage disease, suurgery is simply a palliative measure to improve breathing capability with little of no curative value.
While it is not clear that this information will lead to longer survival, we do know that the earlier treatment can begin, the better chance for a prolonged life expectancy and with time, hopefully a cure.
Until recently, mesothelioma was considered universally fatal. Patients treated with the best available therapy have survived 13 to 25 months in some studies, and with only supportive care the median survival is about 9 months. Studies investigating the diagnosis of mesothelioma have recently reported promising results, which may help reverse this tragic trend.
If caught before spreading beyond the lungs, there is a much greater chance of successfully treating the disease. Once mesothelioma has spread, the disease quickly overcomes its victim. With earlier detection, current treatments would be more effective, more aggressive treatment could be developed and life expectancy could rise dramatically.
One of the challenges of treatment for mesothelioma patients is the inability to detect the aggressive cancer in its early stages. Unfortunately, mesothelioma is very challenging to diagnose until the advanced stages. Because the onset of disease is delayed for as much as 30 years beyond exposure, symptoms are vague and the diagnostic tools are not efficient or specific, many cases are not diagnosed until the disease is advanced.
To date, screening through serial chest x-rays and pulmonary function testing has not been effective in detecting the disease in its earlier stages. While some asbestos related disease has been detected, these methods cannot differentiate between mesothelioma and benign lung disorders. Computer tomography (CT) can detect even small tumors, but also does not distinguish between malignant lesions and benign lung changes. Thus, the stumbling block to early diagnosis is distinguishing early stage cancer from other lung problems.
Biomarkers, or naturally occurring chemicals that can be detected in the blood have been linked to many specific cancers. Studies have shown a link between the substance TPA and mesothelioma, but this correlation had not yet been proven. Ca 125, a known marker for ovarian cancer has also shown promising but unconfirmed results in detecting early stage mesothelioma.
According to a recent article published in the December 2005 New England Journal of Medicine, a recent study of the protein osteopontin produced encouraging results. Comparing patients diagnosed with mesothelioma, patients exposed to asbestos but disease free and healthy control subjects, revealed clear differences in the patients with malignant disease. Although more research is needed to confirm the accuracy of this investigation, a strong correlation between osteopontin levels and mesothelioma was found.
A significantly higher concentration of osteopontin was detected in patients with diagnosed cases of mesothelioma compared to subjects with asbestos exposure. When compared, the levels of osteopontin were not significantly different in unexposed control subjects versus those subjects exposed to asbestos. Nearly 78% of mesothelioma patients showed elevated osteopontin levels. Levels were elevated in both patients with early stage disease (Stage I) and advanced disease. In over 85% of cases, osteopontin levels differentiated patients with mesothelioma versus benign lung conditions.
Definitive detection of mesothelioma in the earlier stages makes surgical removal of tumors possible before the disease has had a chance to spread. Once spread occurs, the effectiveness of surgical treatment drops dramatically. In end?stage disease, suurgery is simply a palliative measure to improve breathing capability with little of no curative value.
While it is not clear that this information will lead to longer survival, we do know that the earlier treatment can begin, the better chance for a prolonged life expectancy and with time, hopefully a cure.
Cancer of the Mesothelium
Overview & Research Study of Malignant Mesothelioma - Cancer of the Mesothelium
Malignant Mesothelioma is layers of neoplasms or tumors that exist in the Pleural or Peritoneal surfaces of the lungs. Malignant mesothelioma is usually linked to occupational or environmental exposure to Asbestos and Asbestos containing products. Malignant mesothelioma occurs when cells of the Mesothelium become abnormal and spread or divide themselves without control or order. The mesothelium is a membrane that forms linings of several body cavities such as the Pleura and Peritoneum. What's so risky about the mesothelium cells spreading and diving without control is that they can easily spread to nearby organs and tissues, and make those organs Cancerous or malignant. Malignant cells can also spread to nearby lungs, thereby causing malignant lung mesothelioma cancer. The function of the mesothelium in the body is to produce a special lubricating fluid that allows organs to rub smoothly against each other and glide, as well as perform their functions. The membrane surrounding the chest is called the Pleura, and the membrane encapsulating the Abdomen is known as the Peritoneum. The membrane surrounding the sac-like space around the heart is known as the Pericardium or Pericardial cavity.
Frequency of Malignant Mesothelioma
Every 1.1 people out of 100,000 in the United States is diagnosed with Mesothelioma lung cancer each year. High concentrations of diagnosis occur in the Pacific to mid-Atlantic states such as Alaska, California, Oregon & Washington. Alaska for instance houses a large # of shipbuilding factories such as Fort Richardson of the US Army. Other common facilities in Alaska that can easily exposed workers to Asbestos include paper mills & oil refineries such as Union Oil Company, BP Oil - North Slope Location, Alaska Steam Compressor Plant, etc.
Types of Malignant Mesothelioma
i) Epithelioid - Between half to 70% of all cases of Malignant mesothelioma are of the Epithelioid type. Epithelioid mesothelioma occurs in the Epithelium (protective layer of tissue) that encapsulates certain organs within the body. Some of these organs include all free open surfaces of the body e.g skin, mucous membranes, intestines, esophagus and uterus.
ii) Sarcomatoid - Sarcomatoid accounts for 8% - 32% of all Malignant mesothelioma cases and originates from Sarcoma which is a form of cancer that is derived from tumors forming in supportive organs of the body including bones, muscles, fats and cartilage.
iii) Biphasic - The other 10% - 32% of all malignant mesothelioma cases are of the Biphasic type. Biphasic malignancy is a combination of Epithelioid & Sarcomatoid mesothelioma because it incorporates tumorous cells from both the Epithelium and supportive organs of the body (which are responsible for the formation of Sarcoma).
Symptoms of Malignant Mesothelioma
Symptoms of malignant mesothelioma generally do not appear until 15 - 50 years after initial exposure to Asbestos due to a long latency period. Since symptoms of malignant mesothelioma are very similar to symptoms of other less serious diseases such as excessive coughing, shortness of breath, nausea, back pain or even chest pain, doing an accurate diagnosis of malignant mesothelioma is very difficult for medical doctors. Often, most patients who are diagnosed with malignant mesothelioma have already advanced their stages of Cancer to higher levels.
List of Common Symptoms of Malignant Mesothelioma
- Chest pain
- Shortness of breath
- Hemoptysis (coughing up blood)
- Loss of appetite, weight loss
- Cough and fever
- Dysphagia (difficulty swallowing food)
- Pleural effusions (fluid buildup in the abdomen)
- Swelling of the face and arms
- Sensory loss
- Nausea
- Back pain
Examination & Diagnosis Methods for Malignant Mesothelioma
i) Chest Radiography: The first screening method for malignant mesothelioma is Chest radiography. Chest Radiography is a radiograph projection of the chest that shows structures of the bones, ribs and lungs. Chest radiographs use ionizing radiation (subatomic particles that are strong enough to detect electrons from particle molecules) to capture images of the chest.
ii) Computed Tomography (CT) - Computed Tomography (CT) scans are used to stage the malignant mesothelioma tumor in to stages ranging from Stage I to Stage V. The staging systems used are Brigham System, Butchart System and the TNM system. They help in determining primary locations of the tumors, their sizes, whether tumor has spread to nearby lymph nodes, as well as Metastasis or Spread of Cancer tumor.
iii) Magnetic Resonance Imaging (MRI) - MRI scans are very popular among medical doctors because they use non-ionizing radio frequency (RF) signals to output images of the chest thus providing greater contrast between different tissues of the body and making it easier to detect tumor cells.
iv) Positron Emission Tomography (PET) - PET scans look for changes in chemical activities within certain organs of the body including the lungs, chest and nearby tissues. Changing chemical activities can help locate the metastasis (spread) and location of particular tumors.
Who Can Develop Mesothelioma?
Mesothelioma is developed in a human's body after inhaling asbestos particles on the job or through exposure to asbestos dust and fibre. Exposure to asbestos dust and fibres can occur for example when a wife washes her husband's clothes who has worked with asbestos. Exposure to asbestos dust and fibres can also occur through home renovations conducted using asbestos cement and related products. Mesothelioma is rarely developed by young people, and it has no relation with smoking, despite of rumours about this. Infact, Mesothelioma can take over 40 years to develop, before full diagnosis is realized! Groups of people at high risk of developing mesothelioma are people who have worked in the following jobs:
a) Insulators or labourers who have worked around Asbestos Insulation in public schools and buildings including asbestos pipe coverings, lagging, asbestos-containing cement & block insulation.
b) Shipbuilders who have worked around boilers, steam pipes, asbestos insulation and in boiler rooms in ships.
c) Construction labourers who have worked around joint compounds, fireproofing insulation, plaster & patching compounds. Other related professions include plumbers & pipefitters working around laden cement pipes, pipe coverings & asbestos insulation in buildings.
d) Miners or mine laborers working around Talc and Vermiculite Asbestos are at increased risk of developing malignant mesothelioma.
e) Automobile mechanics who work around brake pads, brake shoes, clutch discs and linings are at risk of asbestos exposure and subsequent development of malignant mesothelioma. When auto mechanics disassemble brakes and do their labour, there's a high chance asbestos fibers could spread in to the air (become airborne).
f) Railroad labourers who work around steam & diesel locomotives and trains can easily become exposed to Asbestos due to heat resistant properties of asbestos insulation. Asbestos insulation was commonly used around hot water lines, boilers, steam pipes and refregiration units.
Malignant Mesothelioma Resources
What is mesothelioma?
What is mesothelioma?
Mesothelioma is a rare form of cancer (malignancy) that most frequently arises from the cells lining the sacs of the chest (the pleura) or the abdomen (the peritoneum). Pleural mesothelioma is the most common form, often presenting with symptoms in the chest area. Peritoneal mesothelioma is much less common. This can effect the organs in the abdomen, and its symptoms are related to this area of the body, that is, abdominal swelling, nausea, vomiting, and bowel obstruction. The rarest form of mesothelioma is pericardial mesothelioma, which involves the sac surrounding the heart.
There are two major cell types of mesothelioma, epithelial and sarcomatoid. Sometimes both of these cell types can be present. The sarcomatoid type is rarer and occurs in only about 15% of cases; it portends a poorer prognosis. In very rare cases, mesothelioma can originate from benign, non-malignant cells. This so-called benign mesothelioma can be cured surgically.
RESEARCH BY AIMEN
Mesothelioma is a rare form of cancer (malignancy) that most frequently arises from the cells lining the sacs of the chest (the pleura) or the abdomen (the peritoneum). Pleural mesothelioma is the most common form, often presenting with symptoms in the chest area. Peritoneal mesothelioma is much less common. This can effect the organs in the abdomen, and its symptoms are related to this area of the body, that is, abdominal swelling, nausea, vomiting, and bowel obstruction. The rarest form of mesothelioma is pericardial mesothelioma, which involves the sac surrounding the heart.
There are two major cell types of mesothelioma, epithelial and sarcomatoid. Sometimes both of these cell types can be present. The sarcomatoid type is rarer and occurs in only about 15% of cases; it portends a poorer prognosis. In very rare cases, mesothelioma can originate from benign, non-malignant cells. This so-called benign mesothelioma can be cured surgically.
RESEARCH BY AIMEN
What is mesothelioma?
What is mesothelioma?
Mesothelioma is a rare form of cancer (malignancy) that most frequently arises from the cells lining the sacs of the chest (the pleura) or the abdomen (the peritoneum). Pleural mesothelioma is the most common form, often presenting with symptoms in the chest area. Peritoneal mesothelioma is much less common. This can effect the organs in the abdomen, and its symptoms are related to this area of the body, that is, abdominal swelling, nausea, vomiting, and bowel obstruction. The rarest form of mesothelioma is pericardial mesothelioma, which involves the sac surrounding the heart.
There are two major cell types of mesothelioma, epithelial and sarcomatoid. Sometimes both of these cell types can be present. The sarcomatoid type is rarer and occurs in only about 15% of cases; it portends a poorer prognosis. In very rare cases, mesothelioma can originate from benign, non-malignant cells. This so-called benign mesothelioma can be cured surgically.
RESEARCH BY AIMEN
Mesothelioma is a rare form of cancer (malignancy) that most frequently arises from the cells lining the sacs of the chest (the pleura) or the abdomen (the peritoneum). Pleural mesothelioma is the most common form, often presenting with symptoms in the chest area. Peritoneal mesothelioma is much less common. This can effect the organs in the abdomen, and its symptoms are related to this area of the body, that is, abdominal swelling, nausea, vomiting, and bowel obstruction. The rarest form of mesothelioma is pericardial mesothelioma, which involves the sac surrounding the heart.
There are two major cell types of mesothelioma, epithelial and sarcomatoid. Sometimes both of these cell types can be present. The sarcomatoid type is rarer and occurs in only about 15% of cases; it portends a poorer prognosis. In very rare cases, mesothelioma can originate from benign, non-malignant cells. This so-called benign mesothelioma can be cured surgically.
RESEARCH BY AIMEN
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