FLT1 and neoplasm: The expression profiles of VEGFR-1, phosphorylated (activated) VEGFR-1 (pVEGFR-1Tyr1048, pVEGFR-1Tyr1213 and pVEGFR-1Tyr1333) and the VEGFR-1 ligands (VEGF, PlGF and VEGF-B) were investigated using immunohistochemistry in different tumor compartments (intratumoral - invasive front - extratumoral), cell types (tumor cells – macro- (large and small vessels) and the microvasculature (capillaries) - inflammatory cells) in human sporadic non-metastatic, lymphogenous metastatic and haematogenous metastatic CC.