Cancer is a group of diseases where cells in our body grow out of control. When genetically altered cells grow out of control they can either be benign or malignant. Malignant cell growth, where the cells spread to other parts of the body (medically known as malignant neoplasm) is cancer. Benign cell growth does not spread in the same way and is not classified as a cancer.
According to the American Cancer Society, 7.6 million people died worldwide from cancer in 2007. In fact, roughly 13% of all deaths are related to cancer. Cancer affects people at all ages, although we have increased risk of cancer as we age or if we engage in risky behavior, like smoking.
Most cancers form lumps and tumors, but some, like leukemia, do not. The fact is there are more than 100 different types of cancer.    The branch of medicine concerned with the study, diagnosis, treatment, and prevention of cancer is oncology.
Cancer types has been grouped into broad categories which include:
- Carcinoma Рcancer that begins in the skin or in tissues that line or cover internal organs. This type of cancer includes the common forms  of breast, prostate, lung, and colon cancer.
- Sarcoma – cancer that begins in “connected tissue” like bone, cartilage, fat, muscle, and blood vessels.
- Leukemia – cancer that starts in blood-forming tissue such as the bone marrow . This form of cancer results in the production of abnormal blood cells.
- Lymphoma and myeloma – cancers beginning in the cells of the immune system.
- Central nervous system cancers – cancers beginning in the tissues of the brain and spinal cord.
What is the most common form of cancer?
(1) The most common form of cancer in both men and women is skin cancer.  It is estimated over 1 million people get some form of skin cancer every year.
Common cancers (in men) are:
(2) Prostate cancer,
(3) Lung cancer,
(4) Colon or rectal cancer
(5) Bladder cancer
(6) Non-Hodgkin’s lymphona.
(7) Melanoma,
(8) Kidney cancer,
(9) Pharynx and throat cancers,
(10) Leukemia
Common cancers (in women) are:
(2) Breast cancer,
(3) Lung cancer,
(4) Colon or rectal cancer,
(5) Uturine cancer,
(6) Non-Hodgkin’s Lymphona,
(7) Ovarian cancer,
(8) Melanoma,
(9) Cancer of the thyroid glands,
(10) Leukemia
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