PTHrP (parathyroid hormone related protein) is an important mediator of malignancy-related tumor progression and hypercalcemia that shares considerable homology and functionality with parathyroid hormone. In this chapter, we review what has been elucidated to date regarding PTHrP's role in malignancies. Starting with a review of calcium metabolism and regulation, we then summarize the discovery and structure of PTHrP and development of sensitive immunoassays for specific measurement. Subsequently, we explore its role in tumor progression, with emphasis on the primary tumor as well as skeletal and non-osseus metastases. We then consider the clinical implications of PTHrP in cancer before concluding with a discussion of both established and potential treatments for malignancy associated hypercalcemia and bone metastases.
KeywordsParathyroid hormone related protein (PTHrP)
Malignancy associated hypercalcemia (MAH)
Breast cancer
Pancreatic cancer
Genetically engineered animal models (GEAM)
Cachexia
Skeletal metastases
Tumor progression
Therapeutic monoclonal antibodies
PTHrP immunoassays
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