{Reference Type}: Journal Article
{Title}: The IGF-II-Insulin Receptor Isoform-A Autocrine Signal in Cancer: Actionable Perspectives.
{Author}: Scalia P;Giordano A;Williams SJ;
{Journal}: Cancers (Basel)
{Volume}: 12
{Issue}: 2
{Year}: Feb 2020 5
{Factor}: 6.575
{DOI}: 10.3390/cancers12020366
{Abstract}: Insulin receptor overexpression is a common event in human cancer. Its overexpression is associated with a relative increase in the expression of its isoform A (IRA), a shorter variant lacking 11 aa in the extracellular domain, conferring high affinity for the binding of IGF-II along with added intracellular signaling specificity for this ligand. Since IGF-II is secreted by the vast majority of malignant solid cancers, where it establishes autocrine stimuli, the co-expression of IGF-II and IRA in cancer provides specific advantages such as apoptosis escape, growth, and proliferation to those cancers bearing such a co-expression pattern. However, little is known about the exact role of this autocrine ligand-receptor system in sustaining cancer malignant features such as angiogenesis, invasion, and metastasis. The recent finding that the overexpression of angiogenic receptor kinase EphB4 along with VEGF-A is tightly dependent on the IGF-II/IRA autocrine system independently of IGFIR provided new perspectives for all malignant IGF2omas (those aggressive solid cancers secreting IGF-II). The present review provides an updated view of the IGF system in cancer, focusing on the biology of the autocrine IGF-II/IRA ligand-receptor axis and supporting its underscored role as a malignant-switch checkpoint target.