world cancer day : overview , global prevalance , symptoms and treatment .
Cancer is a disease in which certain cells in the body grow uncontrollably and spread to other parts of the body. It can begin almost anywhere in the human body, which contains trillions of cells. Human cells normally grow and multiply (a process known as cell division) to form new cells as the body requires them. Cells die when they become old or damaged, and new cells replace them. When this orderly process fails, abnormal or damaged cells grow and multiply when they should not. These cells can combine to form tumours, which are tissue lumps. Tumors may or may not be cancerous (benign). Cancerous tumours invade nearby tissues and can travel to distant parts of the body to form new tumours (a process called metastasis).
Cancer is classified based on the type of cell where they originate
A type of cancer that arises from epithelial cells. The most common types of cancer in this group are breast, prostate, lung, and colon cancer.
Sarcoma is a type of malignant soft tissue or bone tumour and other connective tissues that support and surround organs.
Lymphoma is a cancer that affects the lymphatic system, which runs throughout the body and can therefore occur anywhere.
Myeloma starts in plasma cells. This cancer has the potential to impair a cell's ability to produce antibodies.
Brain and spinal cord
These are central nervous system cancers. Some are harmless, while others can multiply and spread
It is a type of cancer that affects white blood cells and bone marrow. Leukaemia is classified into Myeloid Leukaemia and Lymphocytic Leukaemia