CLINICAL ASPECTS OF BREAST CANCER RESISTANCE TO ANTHRACYCLINE ANTIBIOTICS

Tymovska Y.O., Zotov O.S.

Main mechanisms involved in the formation of medicinal resistance are presented as well as criteria to differentiate primary resistance from resistance acquired in clinical practice. Outcomes of induction polychemotherapy (PCT) in 247 breast cancer patients are analyzed retrospectively in the context of identification of primary resistance. Patients with locally disseminated BC were exposed to 2 to 4 courses of PCT (CAF scheme). The outcomes were evaluated based on RECIST system and degree of therapeutic pathomorphosis. Correlations are shown between the primary resistance and the patient’s age, mitotic activity, receptor status, and degree of tumor differentiation. Based on literature and own findings, approaches to overcome the primary resistance are suggested.