Overview of Cancer

Cancer is a group of diseases including abnormal cell growth with the potential to spread or invade to other parts of the body. The cells have lost normal mechanism of control & thus are capable of expanding continuously, get into adjacent tissues, move to distant parts of the body & promote the development of new blood vessels from which the tissues derive nutrients.

Types of Cancer

There are over hundred types of cancer. Types of cancer are generally named for the tissues or organs where the cancers form. For instance, lung cancer begins in cells of the lung & brain cancer begins in brain cells. Cancers also defined by the kind of cell that formed them, like a squamous cell or an epithelial cell.



Here are a few categories of cancers that start in particular types of cells:


Carcinomas are one of the most common sort of cancer. They are shaped by epithelial cells that are the tissues that cover the outside & inside  surfaces of the body. There are several types of epithelial cells that frequently have a column-like shape when seen under a microscope.


Sarcomas are cancers which form in bone & soft tissues, such as muscle, fat, lymph vessels, blood vessels & fibrous tissue .

Osteosarcoma is the most prevalent cancer of bone. The most common kinds of soft cells sarcoma are leiomyosarcoma,  malignant fibrous histiocytoma, Kaposi sarcoma, liposarcoma & dermatofibrosarcoma protuberans.


Cancers that start in the blood-forming cells of the bone marrow are known as leukemias. These cancers don’t form solid tumors. Rather, signifigant amounts of abnormal white blood tissues (leukemic blast cells & leukemia cells) develop in the blood & bone marrow, crowding out regular blood cells. The low amount of normal blood cells can allow it to be harder for the body to receive oxygen to its cells, fight infections or control bleeding.

There are 4 common types of leukemia that are grouped depending on how quickly the disease gets worse & on the kind of blood cell the cancer begins in (myeloid or lymphoblastic).


Lymphoma is cancer that starts in lymphocytes (B cells or T cells). These are disorder-fighting white blood cells which are part of the defense system. In lymphoma, irregular lymphocytes develop in lymph nodes & lymph vessels, along with in other internal organs of the body.

There are 2 main types of lymphoma:

Hodgkin lymphoma – Individuals with this disease have irregular lymphocytes that are known as Reed-Sternberg cells. These tissues normally form from B cells.

Non-Hodgkin lymphoma – It is a large group of cancers that begin in lymphocytes. The cancers could grow slowly or quickly & can form from T cells or B cells.

Multiple Myeloma

It is cancer that starts in plasma cells, another kind of immune cell. The irregular plasma cells, known as myeloma cells, develop in the bone marrow & form tumors in bones throughout the body. Multiple myeloma is generally known as plasma cell myeloma & Kahler disease.


It is cancer that starts in cells that become melanocytes that are specific cells that make melanin. Most melanomas form on the epidermis, but melanomas may also form in other pigmented cells, like the eye.

Brain & Spinal Cord Tumors

There are different kinds of brain & spinal cord tumors. These tumors are known as depending on the type of cellular in which they created & where the tumor 1st formed in the core nervous system. For instance, an astrocytic tumor starts in star-shaped brain tissues known as astrocytes, which help keep nerve tissues healthy. Brain tumors could be malignant (cancer) or benign (not cancer).

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