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Serial data of PD-1 expression levels on CD8+ T-cells for two CML patients according to the change in disease phases during follow-up. PD-1 expression was shown to be weakly related to BCR/ABL1 quantification than blast percentage in BM but seemed to be better related to prediction of disease progression. Abbreviations: BP blast phase, CP chronic phase, CHR complete hematologic response, AP accelerated phase
