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Correlation between CTLA-4 and PD-1 expressions in breast cancer patients prior to surgery, assessed by flow cytometry. A statistically significant correlation was identified between CTLA-4 and PD-1 levels prior to surgery (r=0.43; P=0.0084). CTLA-4, cytotoxic T-lymphocyte antigen 4; PD-1, programmed cell death protein 1.
