VEGF is a protein that stimulates cancer to grow. Unfortunately, when melanoma cells are exposed to chemotherapy, VEGF goes into overproduction, which may result in chemotherapy resistance. Avastin is a targeted anticancer drug that slows or prevents the growth of new blood vessels by inhibiting VEGF; this deprives the cancer of oxygen and nutrients. Through its effects on blood vessels, Avastin may also improve the delivery of chemotherapy to cancer. Researchers have speculated that the addition of Avastin to chemotherapy may help control tumor growth and progression more effectively than chemotherapy alone.

Researchers with the North Central Cancer Treatment Group Study NO47A conducted a Phase II clinical trial in 53 patients with inoperable metastatic melanoma who had not received prior therapy. All patients received treatment with Paraplatin, Taxol, and Avastin. The partial response rate was 17%, and 57% of patients had stable disease for at least eight weeks. Median progression-free survival was six months, and median overall survival was 12 months. The most common severe toxicities were low blood cell counts, high blood pressure, and anemia. One patient died after eight cycles of treatment; however, the cause of death was associated with hemorrhaging in a previously undiagnosed brain metastasis.

The researchers concluded that this drug combination was “moderately well tolerated and clinically beneficial in patients with metastatic melanoma.” Research will likely be ongoing to evaluate the benefits of adding Avastin to chemotherapy in this patient population when treating melanoma.

Basal cell carcinoma is a type of skin cancer. It is a malignant epithelial cell tumor that begins as a papule (a small, circumscribed, solid elevation of the skin) and enlarges peripherally, developing into a crater that erodes, crusts and bleeds. Metastasis is rare, but local invasion destroys underlying and adjacent tissue. In 90 percent of all cases, the lesion is seen between the hairline and the upper lip.

Description of Basal Cell Carcinoma

Basal cell carcinoma (BCC) is the most common and least lethal form of all cancers. In the United States, basal cell cancer accounts for 90 percent of all skin cancers in the southern states, and 47 percent in the northern states. It occurs most frequently in people over 45 years of age, and almost twice as often in men as in women. The incidence is far more prevalent among Caucasians. It occurs less often in Asians and rarely among African-Americans. The risk of skin cancer is related to the amount of sun exposure and pigmentation in the skin. The longer the exposure to the sun and the lighter the skin, the greater the risk of skin cancer.

Causes of Basal Cell Carcinoma

The main cause of basal cell carcinoma of the skin is ultraviolet radiation from the sun. The earth’s ozone layer offers protection from UV radiation by blocking it. However, depletion of the ozone layer since the late 1970s has increased the damage to the skin that can result in cancer. Clinical trials are determining if this skin cancer can be prevented.

Symptoms of Basal Cell Carcinoma

The five most typical characteristics of basal cell carcinoma are quite different from each other. Frequently, two or more features are present in one tumor. In addition, basal cell carcinoma sometimes resembles non-cancerous skin conditions, such as psoriasis or eczema. Only a trained physician, usually a dermatologist, can diagnose this cancer.

It is advisable to learn the signs of basal cell carcinoma and examine the body regularly, as often as once a month, if at high risk. A full-length mirror and a hand-held mirror can be very useful for the less visible parts of the body. The five warning signs of basal cell carcinoma are:

* An open sore that bleeds, oozes or crusts, and remains open for three or more weeks. A persistent, non-healing sore is a very common early manifestation.

* A reddish patch or an irritated area, frequently occurring on the chest, shoulders, arms or legs.

* A smooth growth with an elevated, rolled border and an indentation in the center. As the growth slowly enlarges, tiny blood vessels may develop on the surface.

* A shiny bump that is pearly or translucent and is often pink, red, white and can also be tan, black or brown, especially in dark-haired people.

* Scar-like area which often has poorly defined borders. The skin appears shiny or taut when diagnosing basal cell cancer.

Histolory studies have revealed a series of changes that occur over many years and represent a morphologic progression to bronchogenic carcinoma. Early changes include a loss of the ciliated columnar epithelium, basal cell hyperplasia, and the formation of a low columnar epithelium without cilia. These changes are followed by a squamous metaplasia. As cellular atypia develops and advances there is progression through mild, moderate and severe dysplasia to carcinoma in situ. Carcinoma in situ has no metastatic potential. However, once carcinoma in situ penetrates the basement membrane to involve the lamina propria, it is invasive carcinoma and capable of widespread dissemination. These progressive changes are similar to those that proceed the development of squamous cell carcinoma in the uterine cervix. This progressive sequence would suggest that it would be possible to detect abnormalities that are linked to bronchogenic carcinoma.

Most squamous cell carcinomas arise centrally from either the main, lobar or segmental bronchi and ulcerate through the mucosa into the surrounding lung parenchyma. Their central location also tends to produces symptoms at an earlier stage than tumors located peripherally. Although symptoms tend not to be specific, most commonly a non-productive cough, they stem from the involvement of vital structures at the hilar area of the lung. Most patients, however, are detected by a routine chest radiograph, before they are symptomatic. Larger tumors are associated with chest pain, loss of appetite, loss of weight and dyspnea on exertion.

Despite the fact that squamous cell carcinomas are rare, they can cause a characteristic radiographical and clinical syndrome. They are the most common cause of the Pancoast or superior sulcus syndrome. Endobronchial squamous cell carcinoma commonly leads to bronchial obstruction and post obstructive pneumonia. The common radiologic manifestations of squamous cell carcinomas result from the partial or total bronchial obstructions which leads to pneumonia or atelectasis. One characteristic radiographic sign is the “S sign of Golden” which is due to the inability of the upper lobe to completely collapse. The tumor causes the bulging of the minor fissure on the right leading to a sigmoid shape.

There are many instances for which a specific patient’s condition or disease combined with a myriad other factors will require radiation treatment to be used to try to fight skin cancers. There are also many other reasons why an affected patient with skin cancer may seek out x-ray radiation treatment over other types of remedies. One possibility is that the patient has inherent medical or health risks that would prevent them from other types of treatment. Another reason might be if the complete area where the skin cancer is found is either too large or in an part of the body that is not conducive to treatment with surgery, and there are other reasons why radiation treatment with x-rays might be sought. It is always possible that a skin cancer has been treated but is reoccurring frequently. Skin cancer isn’t a sure or easy thing. This type of treatment in particular does show some success – a twenty five to fifty percent drop in re-ocurrence of the disease.

Radiation treatment of skin cancer carries significant risks. The radiation may lead to new cancers in the area surrounding your current cancer. Such cancers will be much more difficult to treat because of the radiation exposure. Healthy skin in that area may also be seriously damaged.

There are also other considerable side effects to have in mind when you are thinking about skin cancer radiation treatment. You may also experience fatigue, nausea, hair loss and redness in the area as another side effect of this kind of radiation therapy. Generally this side effects will disappear when the treatment is stopped, but still patients have to endure the grulling remedy.

If you are considering this kind of skin cancer treatment, your doctor should have already discussed the potential costs and side effects that it may cause. You need to be sure that this treatment is worth the risks that you are assuming. Radiation treatment may not be your best option for fighting skin cancer, and your doctor should be asked if any other means of treatment will be effective.

Other types of grafts are less common, but still valid. An allograft is a skin graft taken from another human donor. A xenograft is a non-permanent skin graft made up of non-human tissue, usually from pigs, that temporarily seals a wound while healing but will eventually be rejected by the body. An isogeneic skin graft is when the donor is genetically identical to the recipient, such as with identical twins. The last kind of skin graft is prosthetic, which is the use of non-tissue or synthetic material, like plastic, to seal the wound.

A skin graft can be classified as partial or full thickness. A partial skin graft is most common and involves shaving a layer of skin from the donor site. A full thickness graft is taken by digging several layers in the epidermis of the donor site to take a thick chunk of the skin. This thicker sample leaves a less visible scar in the recipient area, but a significant gap in the donor area that must be attended to.

The procedure usually begins with general anesthesia. The donor area is cleaned and a tool called a dermatome shaves away a layer of skin from the site. Sometimes surgeons choose to slice the skin into a basket weave pattern, a step that some believe helps in the healing process. The recipient area is also cleaned and the donor skin is placed over the wound. Sutures hold the new skin in place, while pressure is placed on the area with gauze, netting or casting to help the skin adhere.

Following the procedure, the donor area is usually quite sore. Both sites are monitored for infection and bleeding. The recipient site will be checked regularly to ensure that the new skin is being accepted. If the procedure is successful, full recovery takes about three or four weeks.

In laboratories, the safety of new ultraviolet filters is assessed by an initial extensive testing on its properties as a sun screen including photostability, cytotoxicity, photo-cytotoxicity, genotoxicity and photo-genotoxicity tests. These tests are performed in mammals, yeast and bacterial cell systems and skin penetration potential is measured in vitro using human skin, or, when required by regulations, in vivo.

Because modern sunscreens are selected on the basis of their retention on and in the stratum corneum and are formulated as poorly penetrating emulsions, they generally have very low to negligible penetration rates. The safety and efficacy of UV filters are regulated and approved by national and international health authorities while Safety standards in the US, Europe or Japan stipulate that new filters pass a stringent toxicological safety evaluation prior to approval. The safety dossier of a new UV filter resembles that of a new drugs include acute toxicity, irritation, sensitisation, phototoxicity, photo-sensitisation, subchronic and chronic toxicity, reproductive toxicity, genotoxicity, photo-genotoxicity, carcinogenicity and, in the US, photocarcinogenicity testing.

The margin of safety of new UV filters for application to humans is estimated by comparing the potential human systemic exposure with the no-effect level from in vivo toxicity studies. Only substances with a safe toxicological profile and a margin of safety of at least 100-fold are approved for human use. Finally, prior to marketing, new UV filters undergo stringent human testing to confirm their efficacy as well as the absence of irritation, sensitisation, photo-irritation and -sensitisation potential in man. UV filters not only protect against acute skin injury, such as sunburn, but also against long-term and chronic skin damage, including cellular DNA damage, photo-induced immune suppression and, by extension, skin cancer. The protection provided by modern sunscreens against UV-induced skin cancer was shown in animal photocarcinogenicity studies and confirmed by numerous in vitro, animal and human investigations: UV filters protect the p53 tumour suppressor gene from damage and prevent UV-induced immune suppression. Recent studies suggest that sunscreens protect against precursor lesions of skin cancer, such as actinic keratoses.

Additional benefits of ultraviolet filters include prevention of photo-dermatoses, such as polymorphic light eruption, and, possibly, photo-ageing. Modern sunscreens are safe for children and adults. Percutaneous penetration and irritation rates of topically applied substances in children and adults are similar. The principal protective measure is to keep children out of the sun and/or to cover them with protective clothes; however, sunscreens are often the only feasible defence of children against UV radiation. In conclusion, sunscreens are safe protective devices against a carcinogenic hazard that undergo stringent safety and efficacy evaluation.

By damaging the skin’s cellular DNA, excessive UV radiation produces genetic mutations that can lead to skin cancer. Both the U.S. Department of Health and Human Services and the World Health Organization have identified UV as a proven human carcinogen. UV radiation is considered the main cause of nonmelanoma skin cancer, including basal cell carcinoma and squamous cell carcinoma . These cancers strike more than a million and more than 250,000 Americans, respectively, each year. Many experts believe that, especially for fair-skinned people, UV radiation also frequently plays a key role in melanoma, the deadliest form of skin cancer, which kills more than 8,000 Americans each year.
UVA. Most of us are exposed to large amounts of UVA throughout our lifetime. UVA rays account for up to 95 percent of the UV radiation reaching the Earth’s surface. Although they are less intense than UVB, UVA rays are 30 to 50 times more prevalent. They are present with relatively equal intensity during all daylight hours throughout the year, and can penetrate clouds and glass.

UVA, which penetrates the skin more deeply than UVB, has long been known to play a major part in skin aging and wrinkling (photoaging), but until recently scientists believed it did not cause significant damage in areas of the epidermis where most skin cancers occur. UVA contributes to and may even initiate the development of skin cancers. UVA is the dominant tanning ray, and we now know that tanning, whether outdoors or in a salon, causes cumulative damage over time.

UVB, the chief cause of skin reddening and sunburn, tends to damage the skin’s more superficial epidermal layers. It plays a key role in the development of skin cancer and a contributory role in tanning and photoaging. Its intensity varies by season, location, and time of day. The most significant amount of UVB hits the U.S. between 10 AM and 4 PM from April to October. However, UVB rays can burn and damage your skin year-round, especially at high altitudes and on reflective surfaces such as snow or ice, which bounce back up to 80 percent of the rays so that they hit the skin twice. UVB rays do not significantly penetrate glass.

An interesting fact to note is that the industrial chemical sunscreen we commonly know was introduced in the late nineteen twenties and by the mid thirties the first commercially available sunscreen product was being sold by the L’Oreal brand.Monsanto also began to produce artificial chemicals for use in blocking UVA and UVB rays from the sun.

In the world we live in there are an estimated two hundred and fifty different species of bacteria which reside on the human skin. Sebum secreted by the sebaceous glands in our skin is an oily substance that is composed of free fatty acids, wax monoesters, triglycerides and squalene wich are there for a reason.

The bacteria mentioned before and the oily substances we secrete actually help protect the skin but we seem to have come up with endless ways to destroy this natural protective barrier. Chemicals not only strip the skin of its natural protection, they are absorbed through the skin and into the bloodstream where they continue to cause damage.

We have a tendency to destroy this protective barrier. We slather our skin with many toxics most of which gets absorbed into our bloodstream. There are over one hundred and fifty cancer causing chemicals currently used in the cosmetics industry, and although federal law requires products containing these ingredients to carry a warning label no one enforces this law.

Sunscreen ingredients absorb into the blood, and most are linked to toxic effects. Some release skin damaging free radicals, some disrupt hormone systems and several are strongly linked to allergic reactions. Be careful what products you use and always read the labes to be sure you are getting the best there is.

This is the reason why people whose livelihood and geographic location are under the intense heat of the sun are as likely to get this disease. People who live near the equator, in areas with less cloud formation, or live in high-altitude places are examples of cases where the risk factors of skin cancer are high. Other possible causes of skin cancer include:

1. Weak immune system. The impairment of your immune system renders the body vulnerable to foreign entities like germs or any substances that can cause abnormal reactions in the skin. Because of this, you are exposed to a lot of elements which your body is not prepared for, such as ultraviolet rays from the sun.

2. Artificial Tanning Booths. This is still a subject of debate around the world, but it is best to be informed so that you can take measures to prevent it. Tanning booths per se don’t actually cause skin cancer, but longer exposure to these services actually increases your risks of getting the disease. So, it is still better to be safe than sorry.

3. Chemicals. Skin cancer can also be contracted when you come into contact with some chemicals, such as arsenic and hydrocarbons found in oils, soot and tar. These chemicals are harmful to the skin and may cause abnormalities in skin cells, leading to cancer.Like any other form of cancer or breast cancer, treatment is very effective when the disease is detected early, so be sure that when you see any sign on your skin that may look like abnormal formations, call your doctor immediately. Still, despite all this, remember the age-old adage of skin cancer where prevention is better than cure; so if you can, stay away from the intense heat of the sun as possible.

Useful Information: National Cancer Institute | The Skin Cancer Foundation