Regarding treatment strategies, it is suggested that the marked decrease in GPx1 expression may be the major mechanism of tumor sensitization to anthracyclines [93] and that GPx1 can partially inhibit doxorubicin-induced cell death-related signaling in breast cancer by interfering with the activation of the sphingomyelin-ceramide pathway [85]; these findings suggest that tumor regression in response to chemotherapy was correlated with the inhibition of GPx1 activity and confirmed the role of GPx1 in the occurrence and development of breast cancer (Fig. 2). The gene discussed is GPX1; the disease is neoplasm.