Mesothelioma pathophysiology

source :mesotheliomapress.com

The mesothelium consists of a single layer of flattened to cuboidal cells forming the epithelial lining of the serous cavities of the body including the peritoneal, pericardial and pleural cavities. Deposition of asbestos fibres in the parenchyma of the lung may result in the penetration of the visceral pleura from where the fibre can then be carried to the pleural surface, thus leading to the development of malignant mesothelial plaques. The processes leading to the development of peritoneal mesothelioma remain unresolved, although it has been proposed that asbestos fibres from the lung are transported to the abdomen and associated organs via the lymphatic system. Additionally, asbestos fibres may be deposited in the gut after ingestion of sputum contaminated with asbestos fibres.Pleural contamination with asbestos or other mineral fibres has been shown to cause cancer. Long thin asbestos fibers (blue asbestos, amphibole fibers) are more potent carcinogens than "feathery fibers" (chrysotile or white asbestos fibers).[4] However, there is now evidence that smaller particles may be more dangerous than the larger fibers.[1][2] They remain suspended in the air where they can be inhaled, and may penetrate more easily and deeper into the lungs. "We probably will find out a lot more about the health aspects of asbestos from [the World Trade Center attack], unfortunately," said Dr. Alan Fein, chief of pulmonary and critical-care medicine at North Shore-Long Island Jewish Health System. Dr. Fein has treated several patients for "World Trade Center syndrome" or respiratory ailments from brief exposures of only a day or two near the collapsed buildings.[3]Mesothelioma development in rats has been demonstrated following intra-pleural inoculation of phosphorylated chrysotile fibres. It has been suggested that in humans, transport of fibres to the pleura is critical to the pathogenesis of mesothelioma. This is supported by the observed recruitment of significant numbers of macrophages and other cells of the immune system to localised lesions of accumulated asbestos fibres in the pleural and peritoneal cavities of rats. These lesions continued to attract and accumulate macrophages as the disease progressed, and cellular changes within the lesion culminated in a morphologically malignant tumour.Experimental evidence suggests that asbestos acts as a complete carcinogen with the development of mesothelioma occurring in sequential stages of initiation and promotion. The molecular mechanisms underlying the malignant transformation of normal mesothelial cells by asbestos fibres remain unclear despite the demonstration of its oncogenic capabilities. However, complete in vitro transformation of normal human mesothelial cells to malignant phenotype following exposure to asbestos fibres has not yet been achieved. In general, asbestos fibres are thought to act through direct physical interactions with the cells of the mesothelium in conjunction with indirect effects following interaction with inflammatory cells such as macrophages.Analysis of the interactions between asbestos fibres and DNA has shown that phagocytosed fibres are able to make contact with chromosomes, often adhering to the chromatin fibres or becoming entangled within the chromosome. This contact between the asbestos fibre and the chromosomes or structural proteins of the spindle apparatus can induce complex abnormalities. The most common abnormality is monosomy of chromosome 22. Other frequent abnormalities include structural rearrangement of 1p, 3p, 9p and 6q chromosome arms.Common gene abnormalities in mesothelioma cell lines include deletion of the tumor suppressor genes:Neurofibromatosis type 2 at 22q12P16INK4AP14ARFAsbestos has also been shown to mediate the entry of foreign DNA into target cells. Incorporation of this foreign DNA may lead to mutations and oncogenesis by several possible mechanisms:Inactivation of tumor suppressor genesActivation of oncogenesActivation of proto-oncogenes due to incorporation of foreign DNA containing a promoter regionActivation of DNA repair enzymes, which may be prone to errorActivation of telomerasePrevention of apoptosisAsbestos fibres have been shown to alter the function and secretory properties of macrophages, ultimately creating conditions which favour the development of mesothelioma. Following asbestos phagocytosis, macrophages generate increased amounts of hydroxyl radicals, which are normal by-products of cellular anaerobic metabolism. However, these free radicals are also known clastogenic and membrane-active agents thought to promote asbestos carcinogenicity. These oxidants can participate in the oncogenic process by directly and indirectly interacting with DNA, modifying membrane-associated cellular events, including oncogene activation and perturbation of cellular antioxidant defences.Asbestos also may possess immunosuppressive properties. For example, chrysotile fibres have been shown to depress the in vitro proliferation of phytohemagglutinin-stimulated peripheral blood lymphocytes, suppress natural killer cell lysis and significantly reduce lymphokine-activated killer cell viability and recovery. Furthermore, genetic alterations in asbestos-activated macrophages may result in the release of potent mesothelial cell mitogens such as platelet-derived growth factor (PDGF) and transforming growth factor-β (TGF-β) which in turn, may induce the chronic stimulation and proliferation of mesothelial cells after injury by asbestos fibres.

Things To Know About Mesothelioma Cases And The Compensation

By: searchrankpros
Mesothelioma litigation can be initiated by a person who has been diagnosed with the disease. In some states, in certain cases, people who have sufficient reasons to suppose they are suffering from this cancer are allowed to file a lawsuit for receiving compensation. This is because symptoms take a long time to occur and once diagnosed, the life expectancy is usually a few months to one year. The victim has a very short time within which he or she has to arrange for enough finances for medical treatment as well as for financial security of dependants.

The legal process related to mesothelioma cases is time consuming. There are many legal options which your attorney needs to discuss with you. Numerous documents have to be prepared. Forms have to be signed. The required information has to be gathered based on which facts have to be established, such as regarding your exposure to asbestos, how you contracted the disease, negligence on the part of those responsible for your situation, etc.. An investigator might also have to be hired to collect concrete facts that can be used as evidence against the asbestos industry or corporation or former employer, whoever is responsible for your contracting the cancer.
The legal process generally involves the following elements:

Preparing the Case

Once you have decided on a law firm, a contract needs to be signed. This will be an agreement between you and the law firm. There would be several other documents and forms which need to be signed. After this, your attorney discusses the case with you in detail, exploring your work, life and medical history. A lot of information needs to be gathered to get the facts right on your situation, for which you might have to hire an investigator.

Filing the Case

After all the necessary information is collected, a lawsuit is filed by the attorney on your behalf. When your defendant, the company or firm against whom you filed a suit, receives the legal document describing your intentions, they might either respond with a denial of responsibility or go ahead to defend their case.

Discovery and Prosecution

When the defendant does not respond with a motion dismissing their responsibility and opts to defend their case, the period of time from then on until a trial is known as the "discovery" phase. It begins with the Court issuing a schedule for your case. You, the plaintiff, will have to testify at a deposition, answering, under an oath, the questions submitted by the defendant in writing. Your medical records will be asked for, to verify the authenticity of your claim. The defendant will try their best to disprove their role in your contracting mesothelioma. Your mesothelioma attorney will be asking questions and demanding documents from the defendants.

Trial

The trial procedure is the toughest part of the whole process. An experienced attorney can make a lot of difference in making this phase bearable and worthwhile in the end. Right from jury selection, defense motions, to jury deliberations and verdict, an attorney specialized in mesothelioma litigation will manage each procedure to ensure that you receive the monetary compensation you are entitled.

If you have been diagnosed with mesothelioma, it is better to contact an attorney who is specialized in mesothelioma lawsuits as early as possible.

Mesothelioma Cancer - What to Tell Children

by Paul Curran

The amount of information you should give them depends on their age and how grown up they are. Being honest is one thing but giving them all the information at once may be too much. Try spreading it out a bit to ease the shock of the inevitable outcome.

Questions can be answered on a 'need to know basis' initially but as more hospital vists are undertaken and the patient is unwell at times then more detail needs to be offered. Getting the same question over and over again from young children can be difficult at times but it should be realised that this is a normal part of their development.

Teenagers may have a particularly hard time as they now have to cope with additional strong emotions and extra responsibilies, as well as the usual emotions which are part of their development into adults. They may need to turn to others outside the family if they find it difficult to talk to family members e.g.family friend, teacher or counsellor.

Grief raises its head everywhere and it is important to reasure children that it is not their fault that this illness has happened. It seems to be common amongst children that they feel they are to blame and these feelings could last for some time.

Additionally, they may need to be put right about what they have heard from friends and other people as it may not be correct.

Children need to be dealt with sensitively but honestly. But manage the communication of information according to age, maturity and circumstances.

This article may be reproduced in its entirety provided the resource paragraph below is included and all urls kept active.

Grand jury indicts Boston real estate firm on asbestos violationsGrand jury indicts Mayo Group on asbestos disposal allegations

source : telegram.com
An indictment was returned yesterday against a Boston-based real estate investment, development and management company alleging violations of the Clean Air Act and improper disposal of asbestos waste at Bancroft Commons, 50 Franklin St.

According to the state attorney general’s office, The Mayo Group Development LLC was indicted by a Worcester grand jury on charges it violated the Clear Air Act by failing to file notices of asbestos removal with the state Department of Environmental Protection; failing to comply with procedures for asbestos emissions control; and improperly disposing of asbestos waste.

According to the attorney general’s office, the indictments stemmed from an investigation by the Massachusetts Environmental Crimes Strike Force. The strike force alleged the Mayo Group had its own employees demolish parts of the 10-story building and failed to conduct a full asbestos survey of the building and properly remove asbestos from the site before it began renovations. The attorney general’s office said residents were living in the building while workers were demolishing elements that contained asbestos, a known carcinogen.
Investigators also alleged that in February 2007, state DEP employees saw demolition debris being thrown out of a window at Bancroft Commons. Further inspection revealed the discovery of impacted asbestos-containing material in the building and in a waste pile and a disposal trailer on the premises. Authorities alleged asbestos from the site was scheduled for disposal at a landfill that was not a designated asbestos waste disposal site.

A cease and desist order was issued to the Mayo Group in the spring of 2007 after impacted asbestos-containing material was found on the second floor at Bancroft Commons, but unauthorized asbestos removal continued in other parts of the building, posing a risk to both residents and workers involved, the attorney general’s office said.

The indictments were returned yesterday afternoon, according to the attorney general’s office. The Mayo Group will be issued a summons to appear in Worcester Superior Court.

Effects of Smoking on Mesothelioma Patients

source : maacenter.org

It is important to understand that smoking does not cause mesothelioma. Smoking complicates a person's chances of contracting the disease. Mesothelioma cancer, however, is a serious health risk because those who were exposed to asbestos (even for a short time) may contract it. Also, the signs and symptoms do not show until many years after the exposure. It has been argued that cancer such as mesothelioma sees higher death rates because of the patient's inability to detect the symptoms. By the time the cancer is acknowledged by a doctor, treatment is not easily administered.

Smoking and asbestos exposure (whether it is in the present or many years ago) is a very serious combination. The repercussions may include lung cancer or lung related illnesses such as mesothelioma. Though doctors and scientists are seeing breakthroughs all the time by creating different types of clinical trials, the outcome of contracting this disease is not a positive one. Asbestos exposure lodges the fibers in a person's lungs, creating scar tissue that develops the cancer.

Why people should stop smoking after a mesothelioma diagnosis

Many people are under the impression that only smoking causes lung cancer. In a sense, they are right. Mesothelioma is not a case of lung cancer. However, if the lungs are aggravated by the side effects of smoking, asbestosis can form. Asbestosis is not a form of mesothelioma, but it assists in the development of the cancer. Smoking does not increase the chances for developing mesothelioma, but it is argued to increase the chances of lung cancer by 50% or more.

It is important for the mesothelioma patient to stop smoking immediately after diagnosis. It is more likely that a patient who is a smoker will form lung-related illnesses than a person who has been exposed to asbestos for many years. This frightening statistic should be an eye-opener to those with a smoking habit. The only similarity between mesothelioma and lung cancer provoked by smoking is the lack of symptoms and diagnosis in the later stages. Both of these illnesses are difficult to detect at an early stage because of many factors. For lung-cancer patients, it depends how long and how much the person smokes. For mesothelioma patients, it depends on how much asbestos was inhaled and how long the person was exposed.

Smoking can lead to various types of illnesses, but if combined with other elements such as alcohol and other drugs, the chance for poor health increases ten fold. A smoker who has been exposed to asbestos at any point in his or her life should get tested immediately for both mesothelioma and other types of lung-related illnesses, even if symptoms are non-existent.

References:

• Dodson, R. and Hammar, S. Asbestos: Risk Assessment, Epidemiology, and Health Effects. Taylor & Francis: Boca Raton. 2006.
• Stahel RA,Weder W, Felip E; ESMO Guidelines Working Group. Malignant pleural mesothelioma: ESMO clinical recommendations for diagnosis, treatment and follow-up. Clinic and Policlinic of Oncology, University Hospital of Zurich, Switzerland. 2008.
• Pass, I., Vogelzang, N., Carbone, M. Malignant Mesothelioma: Advances in Pathogenesis, Diagnosis, and Transitional Therapies. Springer: New York. 2005.
• http://www.cancer.gov/cancertopics/types/malignantmesothelioma
• http://www.nlm.nih.gov/medlineplus/mesothelioma.html

Mesothelioma Attorneys serving clients in San Diego California and across the United States

source : sandiegomesotheliomalawfirm.com
We are California mesothelioma attorneys with years of success recovering millions for San Diego mesothelioma patients and their families. Because San Diego has been such a hub of activity for the United States Navy, many people who were exposed to asbestos at San Diego ship repair facilities and Naval bases have been afflicted with mesothelioma.

Our attorneys have been representing mesothelioma patients for 25 years.

We have obtained hundreds of millions of dollars in settlements and jury awards for our clients in asbestos lawsuits.

San Diego sites where our clients have worked include the 32nd Street Naval Base, North Island Naval Air Station, Campbell Industries Shipyard, San Diego Marine Shipyard, Triple A Shipyard, National Steel Shipyard, San Diego County Courthouse, the San Diego County Jail, San Diego Juvenile Courthouse Complex, San Diego County Mental Health Center, University of San Diego Hospital, San Diego Health Services Complex, among many others. We have a vast library of information about these and many other San Diego sites, that includes information about the types and brands of asbestos products used at each location.

We represent mesothelioma patients and their families. Mesothelioma is a very serious form of cancer, and families who have been touched by mesothelioma have many challenges ahead. Whatever treatment options a mesothelioma patient chooses, treatment is expensive. A mesothelioma diagnosis can often mean financial hardship without some kind of legal assistance. Our experienced asbestos attorneys can help provide fast compensation to San Diego area families impacted by mesothelioma. The financial resources we make available allow our clients to focus on fighting mesothelioma, beating the odds, and enjoying time with their loved ones.

Every mesothelioma patient’s exposure to asbestos is different. Some, such as insulators, shipyard workers, or boilermakers, had jobs that obviously involved working with asbestos. However, many mesothelioma victims we have represented have not known how or when they were exposed to asbestos until our lawyers completed an extensive asbestos exposure investigation.

By getting to know each client as an individual, and by learning each client’s personal story of asbestos exposure, we can show which asbestos companies were responsible for causing the mesothelioma. As lawyers for people with mesothelioma we hold the asbestos industry accountable for the damage their asbestos products have done. Many people with mesothelioma who first contact us mistakenly believe the asbestos companies did not know their asbestos products caused cancer until the 1970's or 1980's.

This is unfortunately not true. Documents our lawyers have obtained in litigation show that manufacturers of asbestos products knew the workers in their own factories were getting asbestos related lung cancer and mesothelioma from asbestos as early as the 1930's and 1940's, yet they hid this knowledge. It is a modern tragedy that most cases of mesothelioma and other asbestos cancers could and should have been prevented. While we cannot undo the harm that asbestos has caused, our mission as mesothelioma attorneys is to hold the wrongdoers accountable, and to recover the maximum compensation possible for our mesothelioma clients.

Our lawyers represent not only people who have been diagnosed with mesothelioma, but also spouses, sons and daughters of people who have died from mesothelioma. If you or a loved one has been diagnosed with mesothelioma cancer, please contact us as soon as possible. One of our lawyers will fly to your home within a few days. In most cases, you will not have to travel or even appear in court. Our lawyers will investigate your case, meet with you and take video depositions. You will not have to pay any attorneys’ fees unless we obtain a financial settlement for you. Call our toll-free number or fill out the contact form on this page to consult with an experienced asbestos lawyer at no cost about financial assistance available to mesothelioma patients.

Mesothelioma and Asbestos Awareness Center: Earth Day Underscores Asbestos & Environmental Risks Still Unresolved

source : transworldnews.com

This Earth Day, many celebrate the enormous progress we have made in making our planet more sustainable and inhabitable not only for ourselves, but for our children and grandchildren. While indeed we have made extraordinary strides toward this end, there are still environmental issues we need to deal with. These issues affect not only the health of our planet, but the health of its inhabitants.

Among the more pressing issues facing us today is the danger that asbestos exposure poses. Asbestos is a natural mineral, but is often released into the air through the environmentally unfriendly methods of strip mining for other natural resources. While mining for coal, vermiculite, and other minerals, asbestos affects miners and those in neighboring towns. It is indeed a double edged sword when these people are affected not only by the contamination of water supply by strip mining, but also in the air, where dangerous asbestos fibers can be inhaled.

The relationship between the two can easily be overlooked, but upon further examination it is clear the two are closely connected. Among those companies commonly associated with polluting, many have at least some asbestos exposure history among their employees. It is a clear and present danger when corporate interests collide with those of the people. In each case, either our environment or our population is paying the consequences.

Like the risk of environmental contamination, the risk of asbestos exposure is a real human problem. We call on lawmakers to remember the risk of asbestos contamination when introducing further environmental legislation. Like environmental conservation, asbestos exposures are not a problem of the past. We must continue to find new ways to prevent harmful exposures. Additionally, we must continue to fund research for health complications caused by asbestos exposure, such as the cancer mesothelioma.

As we celebrate our accomplishments in the advancement of conservation and a decreased risk of asbestos exposure, let us too find new solutions so that we may finally eliminate these detriments to our earth and humanity.

The Mesothelioma and Asbestos Awareness Center has long been recognized as the web’s leading information resource on asbestos, asbestos related disease, and mesothelioma treatment. Hundreds of pages of up to date content feature important information pertaining to asbestos exposure, top physicians, and ongoing clinical trials, as well as breakthroughs in the treatment of asbestos related disease.