We studied the effect of Herceptin therapy on the population composition of lymphocytes and percentage of CD4+CD25+ cells (regulatory T cells) in breast cancer patients. Herceptin treatment decreased the number of "professional" T suppressors (CD4+CD25+ cells and regulatory T cells) in the peripheral blood.

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Breast cancer steadily holds leading market positions in the malignancy morbidity and mortality pattern. The treatment of metastatic breast cancer remains an extremely topical issue, when its aim is not only to prolong the patient’s life, but also to preserve its quality. Due to advances in molecular diagnostics, it has become possible to use several new classes of drugs in recent times. CDK4/6 inhibitors that demonstrate high efficacy in the first-line therapy for luminal metastatic breast cancer is one of these groups. This review presents data from recent registration studies and a description of observations from our own clinical experience.

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