NCIt definition : Transformation of a mature, normal cell or groups of mature cells to other forms of
mature cells. The capacity for malignant transformation of metaplastic cells is a
subject of controversy.;
Alternative definition : CDISC: Conversion of a mature, normal cell or groups of mature cells to other forms
of mature cells.; NCI-GLOSS: A change of cells to a form that does not normally occur in the tissue
in which it is found.;