Cancer continued; three cancer types
		• Carcinomas; constitute 90% of cancers, are cancers of epithelial cells • Sarcomas; are rare and consist of tumors of connective tissues (connective tissue, muscle, bone etc.) • Leukemias and lymphomas; constitute 8% of tumors.  Sometimes referred to as liquid tumors.  Leukemias arise from blood forming cells and lymphomas arise from cells of the immune system (T and B cells).