Tumor is a swelling part of the body caused by an abnormal growth of tissue, whether benign or malignant. Benign tumor is a mass of cells that lacks the ability to move to other tissues or metastasize. Benign tumors are not cancerous. They have a slow growth rate. Moles are a common benign tumor. Malignant tumors can spread to different tissues and to other parts of the body. It interrupt organ function. Malignant tumors are cancerous. When it begins to spread it is called metastasis when it moves from its original site. Cancer is a disease group that has cells that are unregulated in growth. With cancer the cells divide and spread rapidly. Carcinoma begins in tissue that lines the inner or outer surface of the body. It comes from cells in the endodermal or ectodermal. Sarcoma is cells that are transformed of mesenchymal origin. Found in bone, cartilage, fat, muscle, vascular, or hematopoietic tissues. Cancer that is formed in blood tissues are leukemia and lymphomas, they are found in bone marrow, spleen, and lymph nodes.
http://en.wikipedia.org/wiki/Benign_tumor
http://en.wikipedia.org/wiki/Carcinoma
http://en.wikipedia.org/wiki/Cancer
http://en.wikipedia.org/wiki/Sarcoma
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