The present invention relates to the discovery that altered levels of D-DT (also known as MIF-2) are associated with disorders and diseases. Thus, the present invention relates to compositions and methods useful of the assessment, diagnosis, characterization, prevention and treatment of disorders and diseases associated with an elevated level of D-DT. The present invention also relates to compositions and methods useful of the assessment, diagnosis, characterization, prevention and treatment of disorders and diseases associated with a reduced level of D-DT.