Auto-immune describes medical conditions in which normal cells are attacked by the body's immune system. auto-immune diseases such as rheumatoid arthritis
an immune reaction against self antigens Benign - neoplasms that lack the ability to metastasize; typically have the suffix -oma attached to the cell of origin e g adenoma (benign epithelial neoplasm arising from glandular tissue such as colonic tissue) or chondroma (benign cartilaginous neoplasm)