Cancer is a complex group of diseases characterized by the uncontrolled growth and spread of abnormal cells. Cancerous cells divide without stopping and can form growths known as tumors. There are two main types of tumors: benign and malignant. Benign tumors are not cancerous and do not spread to other parts of the body, while malignant tumors are cancerous and can invade nearby tissues and spread to distant parts of the body through the blood and lymph systems, a process known as metastasis. This uncontrolled cell growth can damage healthy tissue and impair body functions, leading to serious health complications and potentially death. read more >>

These extra cells can divide without stopping and may form growths called tumors. Many cancers form solid tumors, which are masses of tissue. Cancers of the blood, such as leukemias, generally do not form solid tumors. Cancerous tumors are malignant, which means they can spread into, or invade, nearby tissues.read more >>