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Aim: To evaluate the effect of pleuran (β-glucan from Pleurotus ostreatus) administration on the immune profile of patients with endocrine-dependent breast cancer (clinical stages I–II) in clinical and imaging remission. Methodology: Antitumor cellular immunity (CD19+, CD3+, CD4+ and CD8+ T lymphocytes and natural killer cells) of 195 patients (49 in the pleuran group and 146 in the control group) was measured by flow cytometry. Results: We observed a significant increase in the absolute number of CD3+, CD19+, CD4+ and CD8+ T lymphocytes in the pleuran group compared with the control group. Conclusion: Our results suggest potential benefit of continuous pleuran administration on immune rehabilitation of cellular antitumor immunity and better prognosis in breast cancer patients in remission.

Lay abstract We aimed to evaluate the effect of pleuran (β-glucan from oyster mushroom) on the selected immune parameters of patients with breast cancer in remission. We studied antitumor cellular immune parameters of 195 patients (49 in the pleuran group and 146 in the control group) by means of flow cytometry. After 12 months, we measured a significant increase of cytotoxic T lymphocytes in the pleuran group compared with a significant decrease in the control group. Our results suggest potential benefit of long-term administration of pleuran on antitumor cellular immunity and better prognosis in breast cancer patients in remission.