Abstract
The aim of this study was to investigate characteristics of the proteasomal system in luminal breast cancer. There were included 124 patients with primary luminal breast cancer in stage Т13N0-2M0 who had not received neoadjuvant treatment. The process of lymphogenous metastasis was associated with a significant change in caspase-like activity (CL) and subunit composition of proteasomes. CL activity of proteasomes was increased in luminal A breast cancer with extensive lymphogenic metastasis (N2), while it was decreased in the luminal B subtype of cancer. It was accompanied by an increase in the composition of the proteasomal total pool subunits, regulatory and immune subunits. Decrease in CL activity of proteasomes can be poor prognostic sign which is associated with the lymphogenous invasion of the tumor process in luminal B breast cancer.
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