

Tumours have developed a variety of mechanisms to avoid immune responses. One of these mechanisms involves the inhibition of dendritic cells, which are antigen-presenting cells that stimulate B cells and T cells. Recently, it has been demonstrated in vitro that VEGF can prevent the functional maturation of dendritic cells from their haematopoietic progenitors. Tumour secretion of VEGF may play an important role in suppressing the immune antitumoural response.62
The effects of tumoural expression of VEGF are currently being investigated in dendritic cells and haematopoietic stem cells.