The relation between soluble apoptotic proteins and subclinical cardiotoxicity in adjuvant-treated breast cancer patients.

BACKGROUND Circulating apoptotic proteins are increased in heart failure patients. We evaluated whether circulating soluble apoptosis-related protein levels change after anthracycline-containing chemotherapy and radiotherapy in relation to cardiac dysfunction or the applied treatment. PATIENTS AND METHODS Circulating apoptotic proteins were measured with immunoassay in 40 breast cancer patients following surgery (TO), one month (T1) and one year (T2) after epirubicin-based chemotherapy. Standard-dose (n=21) or high-dose (n=19) myeloablative chemotherapy, preceded irradiation and tamoxifen. Circulating apoptotic proteins were compared with previous cardiac evaluations. RESULTS Soluble tumor necrosis factor receptor 1 (+30%), 2 (+43%) and Fas (+40%) were transiently increased at T1 compared to T0, whereas Fas ligand (-64%) was transiently decreased, especially in the high-dose group. Apoptosis markers were not associated with cardiac dysfunction. CONCLUSION Significant, but transient changes in soluble apoptotic protein levels were observed, particularly after high-dose chemotherapy. No relation was found between apoptosis-related proteins and cardiotoxicity.

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