Purpose: Candidate circulating disease response biomarkers for classical Hodgkin lymphoma (cHL) might arise from Hodgkin-Reed-Sternberg (HRS) cells or nonmalignant tumor-infiltrating cells. HRS cells are sparse within the diseased node, whereas benign CD163(+) M2 tissue-associated macrophages (TAM) are prominent. CD163(+) cells within the malignant node may be prognostic, but there is no data on serum CD163 (sCD163).
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