The paper considers data of the long-term studies of androgen metabolism, baseline serum levels of reproductive steroid hormones and their receptors in the tumor, in the blood concentrations of sex steroid-binding globulin and pituitary hormones, the expression of epidermal growth factor, its receptors and ligands, soluble Fas-antigen, vascular endothelial growth factor, angiogenin, and the content of calmodulin, cAMP in the osteosarcoma in 300 patients aged 14 to 56 years, which were made at the N. N. Blokhin Russian Cancer Research Center, Russian Academy of Medical Sciences. Analyzing the findings identified some lines in the study of new pathogenetic treatments for osteosarcoma, aimed at regulating androgen metabolism, correcting the cyclooxygenase pathway of arachidonic acid, the expression of receptors of epidermal growth factor and its ligands, the processes of neoangiogenesis in the tumor. A role of the above parameters in the pathogenesis of osteosarcoma is discussed.
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