Figure 8.

VEGFR1-3, FGFR1-4, PDGFRα and β, cFMS, cKit and FLT-3 expression in PCI-1, PCI-9, PCI-13, PCI-52 and SCC-68 cell lines. The expression of the receptors is plotted on the y-axis as a percentage of the level of the housekeeping gene β-actin. The expression levels were determined as a function of PCR cycles as follows: i) Very strong expression, ≥0.1; ii) strong expression, 0.01–0.09; iii) intermediate expression, 0.001–0.009; and iv) weak expression, ≤0.0009. FGFR, fibroblast growth factor receptor; VEGFR, vascular endothelial growth factor receptor; PDGFR, Platelet-derived growth factor receptor; FLT-3, fms-like tyrosine kinase 3; cFMS, colony stimulating factor 1 receptor; cKit, stem cell growth factor receptor.