Tumor-induced osteomalacia due to a recurrent mesenchymal tumor overexpressing several growth factor receptors.

Tumor-induced osteomalacia due to a recurrent mesenchymal tumor overexpressing several growth factor receptors. Endocrinol Diabetes Metab Case Rep. 2015;2015:150025 Authors: Yavropoulou MP, Gerothanasi N, Frydas A, Triantafyllou E, Poulios C, Hytiroglou P, Apostolou P, Papasotiriou I, Tournis S, Kesisoglou I, Yovos JG Abstract UNLABELLED: Tumor-induced osteomalacia (TIO) is a rare paraneoplastic syndrome caused primarily by benign mesenchymal tumors. These tumors typically follow a benign clinical course and local recurrence occurs in <5% of cases. We investigated a 49-year-old man with a recurrent mesenchymal phosphaturic tumor showing no signs of malignancy. The patient suffered from chronic muscle weakness, myalgia and cramps. His medical record included the diagnosis of oncogenic osteomalacia, for which he was submitted to tumor resection in the left leg three times before. Laboratory examination showed hypophosphatemia, hyperphosphaturia and an elevated serum FGF23 level. A radical surgical approach (amputation) was advised, however, complete biochemical and clinical remission was not reached. Molecular analysis of the tumor cells demonstrated overexpression of growth factor receptors implicated in tumor angiogenesis and metastatic potential (platelet derived growth factor type A (PDGFRA), PDGFRB and vascular endothelial growth factor receptor) together with increased expression of FGF23, x-linked-phosphate-regulating endopep...
Source: Diabetes Metab - Category: Endocrinology Authors: Tags: Endocrinol Diabetes Metab Case Rep Source Type: research