Figure 45. Bone Metastases Screening for Bone Markers & Assays, Bone resorption markers, Markers of malignancy, Markers of cytokine excess and Vit D metabolism. IGF: Insulin like Growth Factor, IL:Interleukin, PTHrP: Parathyroid hormone-related protein, NTX: N-Telopeptide; TGFβ: Tissue growth factor beta.