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Lung cancer is caused by uncontrolled rapid growth of cells in tissues. This type of cancer is most common and results in more than a million deaths every year. This form of cancer is indicated by weight loss or coughing up blood or regularly going out of breath. It can be noticed on chest radio graph also called CT Scan. The treatment that one gets depends on the stage that one is in. Treatment of cancer include surgery, chemotherapy and radiotherapy.
CLASSIFICATION
Lung cancers are classified after studying under them microscope. Classification is necessary as different type of cancer is treated differently. Large portion of lung cancer are carcinomas - malignancies that grow from epithelial cells. Lung-carcinomas are categorized into two types: non -small and small-cell lung carcinoma. Non-small cell lung carcinoma and small cell lung carcinoma account for 80. 4% and 16. 8% frequency of lung cancer, respectively.
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1. NON -SMALL CELL LUNG CARCINOMA
The non -small cell lung carcinomas are grouped together as their prognosis and management are same up to some extent. They are further classified into three types: squamous cell lung carcinoma, adenocarcinoma and large cell lung carcinoma. Squamous cell lung cancer originates near a central bronchus. They account for 25% of lung cancers. Adenocarcinoma starts in peripheral lung tissue. The Cases of adenocarcinoma are a result of smoking. They accounts to 40% of non -small cell lung cancers.
2. SMALL CELL LUNG CARCINOMA
This type of lung cancer is rare. It is sometimes referred to as "oat cell" carcinoma. Most of the times they originate from larger airways (primary and secondary bronchi ) and from there they grow at a rapid pace. This type of lung cancer if mostly associated with smoking.
SECONDARY CANCERS
These cancers are classified on the basis of site of origin like breast cancer but has spread to the lung. Majority of the lung cancers in children are secondary.
STAGING OF LUNG CANCER
Lung cancer staging is used to asses the degree of spread of the cancer from its place of origin. It is an important factor that determines the potential treatment of lung cancer. The degree starts from 1A to 4, 1A being best prognosis and 4 being worst.
SIGNS AND SYMPTOMS
Following are the symptoms of lung cancer: 1. Voice becoming hoarse. 2. Sudden loss of weight. 3. Feeling pain in chest region or abdomen. 4. Difficulty in swallowing. 5. Loss of appetite. 6. Running out of breath. Many of the symptoms mentioned above are non -specific. By the time they notice symptoms or signs, cancer has already spread from place of origin. Very few people with this cancer have signs at time of diagnosis, these cancers are noticed on routine chest radio graph.
CAUSES
The three main causes of cancer are: carcinogens (which is found in tobacco ), viral infection and ionizing radiation. If exposed, it causes changes to DNA in tissue lining the bronchi of the lungs. With more and more tissues getting damaged, cancer develops.
1. SMOKING
Smoking is the main cause of cancer. In one cigarette, there are 60 different known types of carcinogens like radioisotopes and nitrosamine. Smoking is believed to cause 80% of these type of Cases. The risk is generally less in non -smokers. The time that a person smokes proportionately increases the chances of this cancer. There has been cases that if a person stops smoking, the damaged cells gradually gets repaired. In non-smokers, passive smoking is the main causes of lung-cancer. Passive smoking is one inhaled from another person smoking.
2. RADON GAS
The gas produced from breakdown of radium. This gas is colourless and odorless. Exposure to radiation ionize the genetic material, causing mutations that sometimes turn cancerous. Exposure to radon gas is the second major cause of lung-cancer after smoking.
3. ASBESTOS
Asbestos is responsible for causing a number of cancer, one among them is lung cancer. In UK, asbestos accounts for 2 to 3% of the total cases of this cancer.
4. VIRUS
Viruses are responsible for causing lung-cancer in animals. And research has shown of similar potential in humans.
5. PARTICULATE MATTER
Particulate matter has a direct link to lung cancer cases. The size and quantity of particles in air determines the risk of getting lung-cancer. If concentration of particles increases beyond 1%, then the chances of getting this increases by 14%.
PATHOGENESIS
Just like may other cancer forms, lung cancer is started by activation of ocnogenes or inactivation of tumor suppressing genes. Ocnogenes are those genes that make people more vulnerable to cancer. Ocnogenes are produced from proto-ocnogenes, when the latter is exposed to particular carcinogens. In k-ras proto-oncogene, mutations takes place which are responsible for 10 to 30% of lung adenocarcinomas. Tumor invasion, angiogenesis, apoptosis, cell profileration are regulated by the Epidermal growth factor receptor. Mutations and amplification of EGFR are common in non -small cell lung cancer. The basis for treatment with EGFR-inhibitors are also provided by Mutation and amplification of EGFR. Chromosomal damage can lead to loss of heterozygosity which can result in inactivation of tumor suppressor genes. Damage to four of these chromosomes:3p, 5q, 13 q and 17 p are common in small cell lung-carcinoma. The p53, which is a tumor suppressor gene, located on chromosome 17p is affected in most of the cases. c-MET, NKX2-1, LKB1, PIK3A and BRAF are also mutated or amplified. Various genetic polymorphisms are supplementary to this cancer. Some of them include polymorphisms in genes coding for interleukin-1, cytochrome p450, apoptosis promoters such as caspase-8, and XRCC1, which is DNA repair molecule. People having these polymorphisms are more likely to develop lung cancer on being exposed to carcinogens. The research has revealed that MDM2 309G allele is a low-penetrant risk factor for developing this in Asians.
DIAGNOSIS
If a person has reported symptoms that might suggest cancer related to lungs, then chest radio graph is performed in the first step. The test reveals the widening of mediastinium, atelectasis and pleural effusion. Even if there are no radio graphic findings but the hint of this is high because of things like the person being heavy smoker with blood-stained sputum then CT-Scan may provide the necessary data. If findings are unnatural in cells in sputum, then they multiplies the risk of this type of cancer. Early detection can be done by Sputum cytologic examination together with other screening examinations. The differential diagnosis for those patients who show irregularities on chest cardiograph consider cancer related to lungs along with non malignant diseases. These consider infectious reasons like tuberculosis or pneumonia. The above mentioned diseases can lead to lung nodules.
PREVENTION
Prevention, just like always, is better than cure. Steps in this direction have been taken by may countries by identifying carcinogens and banning them but tobacco, which is the major cause of lung cancer, is still common. Eliminating cigarette smoking is first hand target in the prevention of lung cancer. Steps to lessen Passive smoking have also being taken by banning smoking in public places and workplaces. New Zealand has restricted smoking in open places. A similar step is also taken by Chandigarh, India. Bhutan has criminalized smoking since 2005.
SCREENING
Screening is used to detect disease by doing medical tests when the patient is not showing any symptoms. Chest radio graph or computed tomography are the tests used for screening of lung cancer. But, results have shown, that screening tests for lung cancer rarely has shown any benefit.
TREATMENT
The treatment of lung cancer can be done in following ways, depending on the stage or degree of cancer:
1. SURGERY
If doctors have detected lung cancer, then CT scan and positron emission tomography are usually applied to check if the disease is placed and surgery can be done or it has moved to the point where performing surgery is not possible. Surgery can only be performed if spirometry reveals good respiratory reserve, but if it is poor, then surgery is not possible. Even surgery has a death operative rate of 4. 4% but that is because of patient's lung function and other factors.
2. CHEMOTHERAPY
Chemotherapy, along with radiation, is used to treat small cell lung carcinoma. Primary chemotherapy is also used in metastatic non -small cell lung carcinoma.
3. RADIOTHERAPY
Radiotherapy, with chemotherapy, is given when patient is not fit to under go surgery. This type of high intensity radiotherapy is called radical radiotherapy. CHART (continuos hyperfractioned accelerated radiotherapy ) is refined version of this technique in which a high dose of radiotherapy is given for a short period of time. When cancer affects a short section of bronchus, then brachytherapy is given.
EPIDEMOLOGY
Lung cancer is the most widely reported cancer. There are 1. 35 million cases every year and 1. 18 million deaths. Lung cancer develop among those who have a history of smoking over a long period of years i. e 50 years and above. In addition to smoking, passive smoking is also a factor that causes lung cancer. Even the emissions from factories, automobiles, power plants pose a threat to human health. Lung cancer is found to have a reciprocal effect with sunlight and UVB exposure. This is due to effect of Vitamin D, produced in skin during exposure to sunlight.
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Mesothelioma is a serious cancerous disease with low survival rates in spite of various new treatment options which have helped in increasing the longevity. Statistics indicate that the average survival period after diagnosis is about one year. The period might increase up to two years if the treatment is done aggressively. It has been found that more than 95% Cases, mesothelioma occurs due to asbestos exposure.
Most people were earlier unaware of the danger caused by asbestos exposure as the mesothelioma occurs after about 20 to 40 years after being exposed to asbestos. Owing to this reason, this disease was also called as an `old person's disease' as people in 60's or 70's usually contract this disease. Higher prognosis help patients undergo better treatment and in turn better life expectancy.
Epithelium is a tissue separating different regions of the body. Like in the Case of epithelial cells found in the skin detaches the outside of the body from the inside of the body. This serves varied responsibilities like protection, absorption, filtration, excretion, secretion or sensory reception.
Causes and symptoms:
The most common cause of epithelioid mesothelioma is asbestos exposure where the fine particles and which are found thrown in the air either through sawing or cutting. In epithelioid mesothelioma the membrane lining of chest cavity, lungs, heart or abdominal cavity gets affected. In the Case of epithelioid mesothelioma the survival period of the patient is about eight and a half months.
The rate at which people suffering is as much as 50% to 70% of all cancer cells making it the most common type. It is identified based on the unique and organized cell structure which has tubular pattern with a specific cell nucleus. Usually there is a misdiagnoses of the disease as the cells in other forms of cancer look quite similar to epithelioid cells as adenocarcinoma is a type of cancer which is often confused with epithelioid mesothelioma.
Distinguished by a papillary or tubular growth, is the most common subtype of mestothelioma, there are many abnormal histological variants which have also been found which include adenomatoid and deciduoid patterns or tumors composed of small cells or mucin-positive cells, apart from mesothelioma with lepidic intrapulmonary growth.
Symptoms
Symptoms can occur after more than 40 to 50 years of being exposed to asbestos. It is most of the time mistaken for a common bout of asthma, pneumonia or bronchitis due to symptoms of chest pain and breathlessness. Patients can have a cough, weakness, tiredness along with inability to absorb nutrition causing weight loss. Also the most common is the collection of fluid inside the pleural space called pleural effusion.The breathlessness is caused when the tumor does not allow the lungs to expand and when it spreads further it results in severe chest pain.
Diagnosis
A thorough diagnosis is needed prior to any kind of treatment for mesothelioma. As the latency period of this disease's appearance of the symptoms early diagnosis becomes a difficult proposition. It is usually done only at the advanced stage leading to a survival rate of about 8 to 9 months.
To find out whether an individual has to undergo various diagnostic tests like X-ray, MRI, CAT Scan, Transbronchial biopsy where a scope is passed through the trachea to the bronchi area of the lungs, thoracotomy where the chest is opened and checked between the ribs for any tumor, thoracoscopy where a video camera is used to check between the ribs or Centesis where pleural, peritoneal, or pericardial fluid is removed.
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Mesothelioma is a serious cancerous disease with low survival rates in spite of various new treatment options which have helped in increasing the longevity. Statistics indicate that the average survival period after diagnosis is about one year. The period might increase up to two years if the treatment is done aggressively. It has been found that more than 95% Cases, mesothelioma occurs due to asbestos exposure.
Most people were earlier unaware of the danger caused by asbestos exposure as the mesothelioma occurs after about 20 to 40 years after being exposed to asbestos. Owing to this reason, this disease was also called as an `old person's disease' as people in 60's or 70's usually contract this disease. Higher prognosis help patients undergo better treatment and in turn better life expectancy.
Epithelium is a tissue separating different regions of the body. Like in the Case of epithelial cells found in the skin detaches the outside of the body from the inside of the body. This serves varied responsibilities like protection, absorption, filtration, excretion, secretion or sensory reception.
Causes and symptoms:
The most common cause of epithelioid mesothelioma is asbestos exposure where the fine particles and which are found thrown in the air either through sawing or cutting. In epithelioid mesothelioma the membrane lining of chest cavity, lungs, heart or abdominal cavity gets affected. In the case of epithelioid mesothelioma the survival period of the patient is about eight and a half months.
The rate at which people suffering is as much as 50% to 70% of all cancer cells making it the most common type. It is identified based on the unique and organized cell structure which has tubular pattern with a specific cell nucleus. Usually there is a misdiagnoses of the disease as the cells in other forms of cancer look quite similar to epithelioid cells as adenocarcinoma is a type of cancer which is often confused with epithelioid mesothelioma.
Distinguished by a papillary or tubular growth, is the most common subtype of mestothelioma, there are many abnormal histological variants which have also been found which include adenomatoid and deciduoid patterns or tumors composed of small cells or mucin-positive cells, apart from mesothelioma with lepidic intrapulmonary growth.
Symptoms
Symptoms can occur after more than 40 to 50 years of being exposed to asbestos. It is most of the time mistaken for a common bout of asthma, pneumonia or bronchitis due to symptoms of chest pain and breathlessness. Patients can have a cough, weakness, tiredness along with inability to absorb nutrition causing weight loss. Also the most common is the collection of fluid inside the pleural space called pleural effusion.The breathlessness is caused when the tumor does not allow the lungs to expand and when it spreads further it results in severe chest pain.
Diagnosis
A thorough diagnosis is needed prior to any kind of treatment for mesothelioma. As the latency period of this disease's appearance of the symptoms early diagnosis becomes a difficult proposition. It is usually done only at the advanced stage leading to a survival rate of about 8 to 9 months.
To find out whether an individual has to undergo various diagnostic tests like X-ray, MRI, CAT Scan, Transbronchial biopsy where a scope is passed through the trachea to the bronchi area of the lungs, thoracotomy where the chest is opened and checked between the ribs for any tumor, thoracoscopy where a video camera is used to check between the ribs or Centesis where pleural, peritoneal, or pericardial fluid is removed.
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