Abstract
The retinoblastoma protein (pRb105) is a true tumor suppressor as deregulation of the Rb pathway by either mutation of pRb105 itself or other proteins in the pathway, such as p16INK4a, occur in most cancers. This prototypical family member, along with the related p107 and p130, are involved in the control of cell cycle regulation, but pRb105 has also been shown to be involved in tissue development and differentiation. This prospective will discuss the increasing evidence for a role of pRb105 in cellular differentiation and the fact that various cancers, which contain mutant pRb105, or mutations in proteins in the pRb105 pathway, are perhaps a result of deregulation of differentiation.
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