“…Several other studies have reported similar observations with systemic propranolol. [15][16][17][18][19][20] Different hypotheses for the efficacy of this treatment have been proposed, including vasoconstriction, decreased levels of VEGF and FGF, and apoptosis of endothelial cells. Recently, a multicenter randomized controlled trial on 456 patients showed successful results in 88% of hemangiomas treated with propanolol compared with 5% with the placebo.…”