Multiple Myeloma (MM) is an incurable haematological neoplasm that is characterized by homing, survival, and proliferation of malignant, antibody producing plasma cells in the bone marrow. All clinically relevant symptoms (cytopenia, hyperproteinemia and proteinuria with renal insufficiency, hypercalcemia, osteolysis) are due to the aggressive infiltration of the whole bone marrow by MM cells, while all other solid and lymphoid organs including the peripheral blood are normally spared. From these clinical observations and from many preclinical studies it is evident that adhesion of MM cells to the bone marrow cells characterizes the biology of this disease. Adhesion of MM cells leads to the secretion of stimulatory cytokines,upregulation of adhesion molecules, proliferation of MM cells, and drug resistance.