Make your own free website on Tripod.com

 

What is cancer? It is uncontrolled multiplication of abnormal cells.

Cancerous cells and tissues have abnormal growth rates, shapes and sizes and functioning. Cancer may progress from a localized tumor(confined to the site of origin) to direct extension(spread into nearby tissue or lymph nodes) and metastasize. This malignant growth pattern distinguishes cancerous tumors from non-cancerous tumors.

There are many types of cancerous tumors that may be found in the human body. These cancerous tumors highlighted here are found in both males and females.

 


LUNG CANCER

What is lung cancer? it is a malignant tumor of the lung, the leading cause of cancer-related death.

There are four(4) major types of lung cancer:


A picture of the lung


Most cases are due to long term cigarette smoking. Heavy smoking and starting smoking early in one's life increases the risk. Passive inhalation ("secondhand smoke") is linked to lung cancer in nonsmokers. Other risk factors include exposure to radon or asbestos. Symptoms, including coughing (sometimes with blood), chest pain, and shortness of breath, seldom appear until lung cancer is advanced. When treatment is given with surgery, chemotherapy, and radiation or some combination of the three is less effective after it has reached the advanced stage. Most patients die within a year of diagnosis.


RENAL CARCINOMA

What is renal carcinoma? It is a malignant tumor of the cells that cover and line the kidney.

It is also known as the clear-cell carcinoma; or hypernephroma.

It usually affects persons over 40 with vascular disorders of the kidneys, seldom causing pain until it reaches the advanced stage. It often metastasizes to other organs (e.g. lungs, liver, brain, bone) and may go unrecognized until these secondary tumors cause symptoms. Blood can appear in the urine early on but is painless and usually disregarded. Even in the early stages, X-ray films can show deformity in kidney structures. Renal carcinoma may spontaneously regress. After surgical removal, the cancer may recur as much as 20 years later, or not at all.


A picture of the kidney

For more information about tumors of the kidney, click here.


SKIN CANCER

What is skin cancer? It is a malignant tumor of the skin, including some of the most common cancers.

Though recognizable at an early stage, it has a significant death rate. Light skinned people have the highest risk but can reduce their chances of developing skin cancer by limiting their exposure to sunlight and to ionizing radiation. The most common types arise in the the epidermis (outer skin layer) and have become more frequent with the thinning of the atmosphere's ozone layer. The most serious form is melanoma, which is frequently fatal if not treated early with surgery. Cancers arising from the dermis are rare; the best known is Kaposi's sarcoma.


A picture of an individual with skin cancer of the nose.