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90, Akt/mammalian target of rapamycin pathway, Mitogen-activated protein kinase pathway, PhosphorylationBackground Undifferentiated pleomorphic sarcoma (UPS) showing no identifiable line of differentiation is a heterogeneous tumor group as defined by the World Health Organization (WHO) classification [1]. Radiationinduced tumor genesis has also been identified. Heat shock proteins (HSPs) are chape