PDGFA and colorectal carcinoma: We analyzed the gene expression of PD-ECGF [39,40,41], FGF-2 [42,43,44], VEGF-A [45,46,47,48,49], and two alternative spliced forms of PDGF-A (V1 and V2), as well as the protein expression of PD-ECGF, FGF-2, and VEGF-A, which are the key factors of angiogenesis in CRC.