[Unspecific effects of certain siRNA molecules used in the treatment of age related macular degeneration]. 
In clinical trials on age-related macular degeneration, small interfering RNAs (siRNAs) targeting vascular endothelial growth factor or its receptor are used to inhibit angiogenesis.  However, novel data suggests that certain siRNA molecules can act unspecifically, without even entering a cell.  The sequence- and target-independent suppression of the angiogenesis seems to be mediated via extracellular binding to the toll-like receptors TLR3.