<p>IL-7 serum levels in patients with/without bone metastases and in healthy controls were measured by ELISA. Bone metastatic (<i>p</i><0.01) and non-bone metastatic patients (<i>p</i><0.03) had significantly higher IL-7 serum levels compared to healthy controls (A). CaP and healthy tissues were analyzed by Real-Time PCR in order to quantify IL-7 gene expression. The IL-7 quantization was expressed as IL-7 on β-Actin (the control gene) plasmid copy number. The histogram showed comparable IL-7 expression levels in CaP and healthy tissues.</p