TNFRSF11B and neoplasm: Osteoprotegerin is a dissoluble glycoprotein which exists in either two forms a 60-kDa polymer having the same compound or a 120-kDa polymer having the compounds of two different types connected by S-S or two sulphide groups bridged by covalent bonds.37 OPG is also identified as proinflammatory molecule and is associated with angiogenesis and vasculogenesis and is also involved in tumour metastasis and growth.38