Richard Kremer is from Department of Medicine, McGill University, USA. His main research focuses are: (1) Elucidating how 1, 25-dihydroxyvitamin D3 1, 25(OH) 2D3, the active form of vitamin D, influences cell growth and differentiation in the skeleton and in cancer cells. (2) Establishing the role of parathyroid hormone related-protein (PTHrP) in tumor initiation, growth and metastasis. (3) Elucidating the role of circulating tumor cells in cancer progression to identify specific markers of skeletal metastasis in breast and prostate cancer.