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The word 'cancer' refers to a group of diseases in which the normal cells undergo a transformation process that triggers rapid and abnormal cell division. These abnormalities in the cell division process often give rise to the formation of lumps called 'tumors'. Tumors can be either benign (non-cancerous) or malignant (cancerous). Malignant tumor tissue grows and invades all adjacent tissues and organs around the primary cancer site, thereby obstructing the normal physiological functions of the body. Gradually, the cancerous cells detach from the primary site and spread through the blood and lymphatic system to various parts of the body, forming new tumors. This process is known as cancer metastasis. Eventually, the malignant tumors cause various organs of the body to start malfunctioning, leading to death. Some of the more common forms of cancer are lung and bronchus, colon and rectum, skin, bladder, prostate in men and breast, ovarian, and cervical in women.