Urea immunoliposome induced inhibition of hemangioma vascular endothelial cell (HVEC) proliferation. HVECs were passaged in 24-well plates at a density of 1 × 104 cells per well. Twenty-four hours later, the cells were divided into five groups: three experimental groups treated with 2.6% urea, 2.6% urea liposome, or 2.6% urea immunoliposome, and two control groups treated with the same volume of liposome or normal medium at four wells per group. The number of cultured HVECs was subsequently counted every day for 8 days. The data are representative of three independent experiments.