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The activities of NTPDase (EC 3.6.1.5, apyrase, CD39) and 5′-nucleotidase (EC 3.1.3.5, CD73) enzymes were analyzed in platelets from breast cancer patients. Initially, patients were compared in terms of length (years) of tamoxifen use. The following groups were studied: breast cancer patients who did not use tamoxifen, patients using tamoxifen for 1–48 months, patients using tamoxifen for 49–84 months,...
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